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学者姓名：饶峰
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Abstract ：
Oceans and saline soil environments strongly demand for concrete with high compressive strength and high chlorine salt corrosion resistance. Herein, a new preparation process of geopolymer concrete with high compressive strength and chlorine salt corrosion resistance was established, and the process was optimized by adjusting the water/cement ratio, the proportion of Na2O and the amount of fly ash. Mechanical properties tests show that the compressive strength of geopolymer concrete increases with increase in Na2O proportion but decreases with increase in water/cement ratio and fly ash. The compressive strength of geopolymer concrete is as high as 96.20 MPa, when the water/cement ratio is 0.6, the proportion of Na2O is 0.12, and the amount of fly ash is 10%. This may be because the C-(A)-S-H gel makes the geopolymer concrete denser. At the same time, electrochemical impedance spectroscopy and Tafel results imply that the geopolymer concrete also has great chlorine salt corrosion resistance, the lowest weight loss rate of steel bar is only 0.06% after 240 h accelerated corrosion. The leaching tests indicate that at the same depth, the total and free chloride ions in geopolymer concrete are minimum and some chloride ions are combined. The high chlorine salt corrosion resistance could be attributed to the increase in C-(A)-S-H gel which refines the pore structure of concrete, improves concrete compactness and binds the chloride ions. This paper provides a new method for the high-quality utilization of solid waste and a potential clue for the preparation of high-performance concrete.
Keyword ：
Chloride ion corrosion Chloride ion corrosion Gel evolution Gel evolution Geopolymer Geopolymer High compressive strength High compressive strength
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| GB/T 7714 | Yang, Lang , Liu, Yumei , Wang, Xiaofei et al. The Preparation of BFS/FA-Based Geopolymers with High Compressive Strength and Anti-corrosion Property to Chloride [J]. | ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING , 2025 , 50 (18) : 15053-15064 . |
| MLA | Yang, Lang et al. "The Preparation of BFS/FA-Based Geopolymers with High Compressive Strength and Anti-corrosion Property to Chloride" . | ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 50 . 18 (2025) : 15053-15064 . |
| APA | Yang, Lang , Liu, Yumei , Wang, Xiaofei , Wei, Jianbiao , Xiao, Degao , Rao, Feng . The Preparation of BFS/FA-Based Geopolymers with High Compressive Strength and Anti-corrosion Property to Chloride . | ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING , 2025 , 50 (18) , 15053-15064 . |
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In this study, combination of wave absorption materials with different loss mechanisms are added into iron ore tailings-blast furnace slag (IOT-BFS) based geopolymers. The employed materials are hollow glass microsphere (HGM), carbon nanotubes (CNT) and carbonyl iron powder (CIP). Microstructures of the geopolymers are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and concrete porous structure analyzer. Conductivity and electromagnetic absorption property of the geopolymers are measured by a conductivity tester and a vector network analyzer (VNA). As increasing the content of wave absorption materials, compressive strength of the geopolymer decreased from 60.5 to 33.8 MPa. Compared with geopolymers containing HGM and CNT, wave absorption band below -5 dB of the geopolymers with HGM and CIP was wider, particularly at frequencies below 7 GHz, due to the synergism of space and magnetic loss. Its absorption bandwidth with the reflection loss less than -5 dB reaches 15.6 GHz. This study gives a clue for preparation of geopolymers with satisfactory electromagnetic wave absorption properties in the utilization as construction materials.
Keyword ：
Electromagnetic wave absorption Electromagnetic wave absorption Geopolymers Geopolymers Iron ore tailings Iron ore tailings Microstructure Microstructure
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| GB/T 7714 | Wang, Tianyu , Ning, Xuwen , Yang, Lang et al. The synthesis of an iron tailings-based geopolymer with synergistic electromagnetic wave consumption property [J]. | ENVIRONMENTAL RESEARCH , 2025 , 268 . |
| MLA | Wang, Tianyu et al. "The synthesis of an iron tailings-based geopolymer with synergistic electromagnetic wave consumption property" . | ENVIRONMENTAL RESEARCH 268 (2025) . |
| APA | Wang, Tianyu , Ning, Xuwen , Yang, Lang , Rao, Feng , Jiang, Kaixi . The synthesis of an iron tailings-based geopolymer with synergistic electromagnetic wave consumption property . | ENVIRONMENTAL RESEARCH , 2025 , 268 . |
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In this work, a novel electromagnetic wave absorption geopolymer was created with efficient utilization of two solid wastes iron tailings and blast furnace slag, meanwhile the mechanism and impacts of iron tailings content, water-solid ratio and specimen thickness on their electromagnetic wave absorption and mechanical property were systematically investigated. It was found the pores, micro-cracks and unreacted particles in the specimens are benefitial for electromagnetic wave absorption but against to compressive strength, even though the compressive strength reaches 69.7 MPa with the iron tailings content 50% and water-solid ratio 0.4. The addition of iron tailings significantly enhances the electromagnetic wave absorption properties of the geopolymers, and increasing iron tailings content improves the number of pores, micro-cracks and the permeability of geopolymers. The electromagnetic wave absorption properties of the geopolymer initially increase and then decrease with the increase of specimen thickness and water-solid ratio. With an iron tailings content 70%, water-solid ratio 0.4 and thickness 30 mm, the effective absorption bandwidth (< -5 dB) was optimized to 10.44 GHz with a minimum reflection loss of -13.34 dB. A new mechanism for electromagnetic absorption in iron tailings has been proposed, in which the electromagnetic wave absorption of geopolymers is mainly dominated by magnetic loss and spatial propagation loss. This study provides higher competitiveness and comprehensive utilisation of iron tailings in the field of electromagnetic wave absorbing building materials, and has great potential for applications in military and other fields affected by high electromagnetic wave frequencies.
Keyword ：
Geopolymers Geopolymers Iron tailings Iron tailings Microwave absorption Microwave absorption Reflectivity Reflectivity
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| GB/T 7714 | Ning, Xuwen , Yang, Lang , Rao, Feng et al. A novel electromagnetic wave absorption geopolymer originated from iron tailings and blast furnace slag [J]. | MATERIALS AND STRUCTURES , 2025 , 58 (1) . |
| MLA | Ning, Xuwen et al. "A novel electromagnetic wave absorption geopolymer originated from iron tailings and blast furnace slag" . | MATERIALS AND STRUCTURES 58 . 1 (2025) . |
| APA | Ning, Xuwen , Yang, Lang , Rao, Feng , Wang, Tianyu , Wu, Shengping , Huang, Hanhui . A novel electromagnetic wave absorption geopolymer originated from iron tailings and blast furnace slag . | MATERIALS AND STRUCTURES , 2025 , 58 (1) . |
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In this study, a low-cost porous geopolymers (PGP) were prepared using coal gangue and fly ash as raw materials to remove organic and heavy metal ions from wastewater. Various characterization techniques were employed to investigate the microstructure, morphology, pore size distribution, and surface functional groups of the porous geopolymers. The results indicate that the geopolymer exhibits a porous structure with hydroxyl groups on the surface after foaming. It was found that the porous geopolymers exhibited good adsorption capacity for Methylene Blue (MB), Cu(II), and Pb(II), with optimal adsorption capacities reaching 35.60 mg/g, 98.31 mg/g, and 85.67 mg/g, respectively. Fitting analysis suggests that the adsorption of MB, Cu(II), and Pb(II) is better described by the pseudo-second-order kinetic model and the Freundlich isotherm model. This indicates that the adsorption process is primarily chemical adsorption with multilayer adsorption. Competitive adsorption studies showed that Cu(II) could enhance the adsorption of MB, while Pb(II) had no significant effect on the adsorption of MB. Mechanistic studies revealed that the adsorption of MB by PGP is mainly through pore adsorption, electrostatic attraction, and hydrogen bond formation; whereas the adsorption of Cu(II) and Pb(II) is primarily through pore adsorption, electrostatic attraction, chemical reactions, and ion exchange. Recycling experiments demonstrated that after five repetitions, the adsorption capacity of PGP for the three pollutants remained above 60 %. These findings confirm the potential of porous geopolymers as adsorbents. Preliminary cost analysis shows that the adsorption cost of porous geopolymers is only 2.07 RMB/kg, making the geopolymer adsorbent economically advantageous and promising for application, especially considering its ability to utilize industrial solid waste.
Keyword ：
Adsorption capacity Adsorption capacity Adsorption mechanism Adsorption mechanism Competitive adsorption Competitive adsorption Cost analysis Cost analysis Porous geopolymer Porous geopolymer
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| GB/T 7714 | Fang, Yi , Yang, Lang , Rao, Feng et al. Adsorption behavior and mechanism of MB, Pb(II) and Cu(II) on porous geopolymers [J]. | CERAMICS INTERNATIONAL , 2025 , 51 (9) : 11455-11466 . |
| MLA | Fang, Yi et al. "Adsorption behavior and mechanism of MB, Pb(II) and Cu(II) on porous geopolymers" . | CERAMICS INTERNATIONAL 51 . 9 (2025) : 11455-11466 . |
| APA | Fang, Yi , Yang, Lang , Rao, Feng , Zheng, Yongming , Song, Zhenguo . Adsorption behavior and mechanism of MB, Pb(II) and Cu(II) on porous geopolymers . | CERAMICS INTERNATIONAL , 2025 , 51 (9) , 11455-11466 . |
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The development of geothermal resources in deep mining has garnered extensive research interest in recent years. The present work studies the thermal storage backfill materials synthesized by integrating microencapsulated phase change materials (MPCM) into geopolymers prepared with copper mine tailings (CMT) and blast furnace slag (BFS). With the increment of MPCM content, the compressive strength of the geopolymers declined. Despite this, the lowest 7 days compressive strength of the geopolymers could still reach 24.5 MPa. The results in microstructures of the geopolymers indicated that paraffin was successfully encapsulated within the microcapsules and MPCM was well dispersed in the geopolymer matrix. The melting temperature of the MPCM was 54.78 degrees C and the melting latent heat was 116.43 J/g. Infrared thermography showed that the highest average temperature of geopolymer with 20 % MPCM was 5.0 degrees C lower than that without MPCM, indicating superior thermal storage capacity of the geopolymers with MPCM. This study provides a clue for the synthesis of thermal storage backfill materials with in-situ waste in extracting geothermal resources and reducing the temperature of deep mining environments.
Keyword ：
Microencapsulated phase change materials Microencapsulated phase change materials Microstructure Microstructure Mine tailings-based geopolymer Mine tailings-based geopolymer Thermal storage Thermal storage
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| GB/T 7714 | Chen, Yuxiang , Xiao, Degao , Wei, Jianbiao et al. Preparation of copper mine tailings-based geopolymers as thermal storage functional backfill materials [J]. | ENVIRONMENTAL RESEARCH , 2025 , 275 . |
| MLA | Chen, Yuxiang et al. "Preparation of copper mine tailings-based geopolymers as thermal storage functional backfill materials" . | ENVIRONMENTAL RESEARCH 275 (2025) . |
| APA | Chen, Yuxiang , Xiao, Degao , Wei, Jianbiao , Mo, Liwei , Rao, Feng , Yang, Lang . Preparation of copper mine tailings-based geopolymers as thermal storage functional backfill materials . | ENVIRONMENTAL RESEARCH , 2025 , 275 . |
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It is projected that by 2025, the quantity of retired lithium-ion batteries (LIBs) in China will reach the magnitude of one million units annually. The recycling of these spent LIBs is crucial as it can significantly reduce reliance on mineral resources and avert the environmental hazards associated with landfill disposal. However, the field still awaits a breakthrough in the theoretical and practical aspects of efficiently separating and recycling the cathode and anode materials from spent LIBs. Drawing from the most recent research on the separation and recovery of spent LIBs conducted both domestically and internationally, this paper provides a comprehensive review and summary of the processes and mechanisms involved in flotation, magnetic separation, and their combined process. It also generalizes the pretreatment techniques for spent LIBs, such as roasting, milling, and Fenton oxidation, and compares the merits of various pretreatment methods and the flotation chemistry used for LIBs. The text discusses the merits of flotation and magnetic separation in facilitating the damage-free recovery of spent LIBs. It is highlighted that the efficiency of recovery can be enhanced through the synergistic application of flotation and magnetic separation techniques. The aim of this paper is to consolidate the latest findings in the field and to propel the advancement of efficient separation and recovery methods for anode and cathode materials from spent LIBs.
Keyword ：
Flotation Flotation Magnetic separation Magnetic separation Pretreatment Pretreatment Separation and recovery Separation and recovery Spent lithium-ion batteries Spent lithium-ion batteries
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| GB/T 7714 | Ji, Pengfei , Yang, Lang , Rao, Feng et al. Damage-Free Recovery of Cathode and Anode Materials from Spent Lithium Battery with Flotation and Magnetic Separation: A Review [J]. | JOURNAL OF SUSTAINABLE METALLURGY , 2025 , 11 (2) : 683-709 . |
| MLA | Ji, Pengfei et al. "Damage-Free Recovery of Cathode and Anode Materials from Spent Lithium Battery with Flotation and Magnetic Separation: A Review" . | JOURNAL OF SUSTAINABLE METALLURGY 11 . 2 (2025) : 683-709 . |
| APA | Ji, Pengfei , Yang, Lang , Rao, Feng , Liu, Wenbiao . Damage-Free Recovery of Cathode and Anode Materials from Spent Lithium Battery with Flotation and Magnetic Separation: A Review . | JOURNAL OF SUSTAINABLE METALLURGY , 2025 , 11 (2) , 683-709 . |
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In this study, four N-containing collectors were compared systematically to study the flotation selectivity, froth layer stability and economic cost in reverse flotation of silicate minerals from fluorapatite. The adsorption of collectors were studied by zeta potential and x-ray photoelectron spectroscopy (XPS) measurements. Froth stability of the slurries with collectors was characterized through froth image and water recovery analysis. The flotation of pure fluorapatite, quartz, mica and raw phosphate ore gave that oleyl amine (OA) and N-(2-hydroxyethyl)-dodecane amide (HEDA) had better selectivity than dodecyl amine (DDA). It was found that the physisorption of OA and HEDA associated with the silicate mineral surfaces through hydrophobic bonding to form hemimicelles. Interestingly in octyl-hydroxamic acid (OHA) flotation, the best selectivity in reverse flotation of silicate minerals from fluorapatite was obtained, because of the chemisorption of O atoms on Al atoms through chelating rings. For froth stability, OA and HEDA induced a denser froth layer than DDA. In OHA flotation slurry, the individual bubbles were larger and easier to coalesce, leading to the lowest water recoveries and froth stability. This study might provide a further understanding on the N-containing collectors in reverse flotation of silicate minerals from fluorapatite.
Keyword ：
Adsorption Adsorption Amine collector Amine collector Flotation Flotation Froth stability Froth stability Octyl-hydroxamic acid Octyl-hydroxamic acid
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| GB/T 7714 | Huang, Wenxuan , Liu, Wenbiao , Zheng, Yongming et al. The comparison of N-containing collectors on selectivity and froth stability in reverse flotation of silicate minerals from fluorapatite [J]. | MINERALS ENGINEERING , 2025 , 230 . |
| MLA | Huang, Wenxuan et al. "The comparison of N-containing collectors on selectivity and froth stability in reverse flotation of silicate minerals from fluorapatite" . | MINERALS ENGINEERING 230 (2025) . |
| APA | Huang, Wenxuan , Liu, Wenbiao , Zheng, Yongming , Rao, Feng , Yang, Lang , Jiang, Kaixi . The comparison of N-containing collectors on selectivity and froth stability in reverse flotation of silicate minerals from fluorapatite . | MINERALS ENGINEERING , 2025 , 230 . |
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In this study, the structure and phase transition of kaolin lithium clay at different calcination temperatures were studied and discussed; subsequently, the effects of Li leaching with sulfuric acid under various factors were investigated in detail. The experimental results indicated that an optimal Li leaching rate of 81.1% could be achieved when kaolin lithium clay was calcined at 600 degrees C for 1 h, followed by leaching with 15.0% sulfuric acid at 80 degrees C for 2 h. The TG-DSC, XRD, and SEM analyses showed that the layered structure of the clay was not destroyed during the leaching and calcination processes. During the process of calcination, kaolinite was converted to metakaolinite via dehydroxylation. During the process of leaching, the Al on the surface of the metakaolinite was dissolved by sulfuric acid, resulting in the destruction of the Al-O structure; then, Li+ was exchanged for H+ to the surface of the mineral and entered the solution under the action of diffusion. The leaching kinetics showed that the leaching process was controlled by a diffusion model, and the activation energy (Ea) was 41.3 kJ/mol. The rapid extraction of Li from calcined kaolin lithium clay with sulfuric acid leaching offers a high-efficiency, low-energy-consumption strategy for the utilization of new lithium resources.
Keyword ：
calcination calcination kinetics kinetics leaching behavior leaching behavior lithium clay lithium clay sulfuric acid sulfuric acid
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| GB/T 7714 | Zhong, Wenlin , Yang, Lang , Rao, Feng et al. Efficient Extraction of Lithium from Calcined Kaolin Lithium Clay with Dilute Sulfuric Acid [J]. | MINERALS , 2024 , 14 (4) . |
| MLA | Zhong, Wenlin et al. "Efficient Extraction of Lithium from Calcined Kaolin Lithium Clay with Dilute Sulfuric Acid" . | MINERALS 14 . 4 (2024) . |
| APA | Zhong, Wenlin , Yang, Lang , Rao, Feng , Tong, Liangzhou , Feng, Haipeng . Efficient Extraction of Lithium from Calcined Kaolin Lithium Clay with Dilute Sulfuric Acid . | MINERALS , 2024 , 14 (4) . |
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Geopolymers show great potential in complex wastewater treatment to improve water quality. In this work, general geopolymers, porous geopolymers and geopolymer microspheres were prepared by the suspension curing method using three solid waste products, coal gangue, fly ash and blast furnace slag. The microstructure, morphology and surface functional groups of the geopolymers were studied by SEM, XRD, XRF, MIP, FTIR and XPS. It was found that the geopolymers possess good adsorption capacities for both organic and inorganic pollutants. With methylene blue and potassium dichromate as the representative pollutants, in order to obtain the best removal rate, the effects of the adsorbent type, dosage of adsorbent, concentration of methylene blue and potassium dichromate and pH on the adsorption process were studied in detail. The results showed that the adsorption efficiency of the geopolymers for methylene blue and potassium dichromate was in the order of general geopolymers < porous geopolymers < geopolymer microspheres, and the removal rates were up to 94.56% and 79.46%, respectively. Additionally, the competitive adsorption of methylene blue and potassium dichromate in a binary system was also studied. The mechanism study showed that the adsorption of methylene blue was mainly through pore diffusion, hydrogen bond formation and electrostatic adsorption, and the adsorption of potassium dichromate was mainly through pore diffusion and redox reaction. These findings demonstrate the potential of geopolymer microspheres in adsorbing organic and inorganic pollutants, and, through five cycles of experiments, it is demonstrated that MGP exhibits excellent recyclability.
Keyword ：
adsorption capacity adsorption capacity competitive adsorption competitive adsorption geopolymer microspheres geopolymer microspheres mechanism mechanism
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| GB/T 7714 | Fang, Yi , Yang, Lang , Rao, Feng et al. Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems [J]. | MOLECULES , 2024 , 29 (7) . |
| MLA | Fang, Yi et al. "Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems" . | MOLECULES 29 . 7 (2024) . |
| APA | Fang, Yi , Yang, Lang , Rao, Feng , Zhang, Kaiming , Qin, Zhuolin , Song, Zhenguo et al. Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems . | MOLECULES , 2024 , 29 (7) . |
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Engineering muck (EM) in South China is a typical construction waste, which has a low utilization rate. After the thermal treatment, this study prepares the EM-based geopolymers and evaluates the CO2 emission. The calcined EM and the geopolymers were characterized through thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and nuclear magnetic resonance (NMR) spectroscopy. The results showed that when the thermal treatment temperature was 850 degrees C, the dissolution of aluminum (Al) and silicon (Si) was adequate, significantly enhancing the reactivity of geopolymerization and thus forming a geopolymer with dense structures and excellent mechanical properties. Notably, the compressive strength at 7 days for the geopolymer exceeded 50 MPa, and the cumulative pore volume and pore size distribution were both minimal. In addition, an environmental implication analysis revealed that the recycled geopolymers could reduce carbon emissions by approximately 11-65 kg CO2/t when compared to conventional concretes, contributing towards low-carbon goals. The findings of this study propose a more environmentally friendly strategy for the treatment of the EM, contributing to the advancement of sustainable solid waste utilization.
Keyword ：
Alkali activation Alkali activation Carbon emission Carbon emission Engineering muck Engineering muck Pore structure Pore structure Thermal treatment Thermal treatment
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| GB/T 7714 | Yuan, Bingxiang , Liang, Jingkang , Li, Xianwang et al. Sustainable utilization of clay minerals-rich engineering muck via alkali activation: Optimization of pore structure by thermal treatment [J]. | APPLIED CLAY SCIENCE , 2024 , 258 . |
| MLA | Yuan, Bingxiang et al. "Sustainable utilization of clay minerals-rich engineering muck via alkali activation: Optimization of pore structure by thermal treatment" . | APPLIED CLAY SCIENCE 258 (2024) . |
| APA | Yuan, Bingxiang , Liang, Jingkang , Li, Xianwang , Zhang, Baifa , Luo, Qingzi , Sabri, Sabri Mohanad Muayad et al. Sustainable utilization of clay minerals-rich engineering muck via alkali activation: Optimization of pore structure by thermal treatment . | APPLIED CLAY SCIENCE , 2024 , 258 . |
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