Preparation and Adsorption Characteristics of Novel Molecular Sieve for High Efficiency Arsenic Removal [高效除砷分子筛新型材料制备及其吸附特性研究] - Details

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Abstract：

In　order　to　enhance　the　adsorption　performance　of　4A　molecular　sieve　for　arsenic　in　aqueous　solution,　using　MS　as　a　carrier,　iron-loaded　molecular　sieves　(FMS)　and　iron-manganese　molecular　sieves　(FMMS)　were　prepared　as　adsorbents　for　arsenic　removal　by　impregnation　method.　The　MS　and　FMS　were　characterized　by　SEM,　FT-IR　and　BET,　and　carried　out　batch　experiments　to　investigate　the　adsorption　and　removal　effects　of　FMS　and　FMMS　for　pentavalent　arsenic　(As5+)　and　trivalent　arsenic　(As3+).　The　adsorption　kinetics,　isothermal　adsorption　test　and　adsorption　thermodynamics　of　the　FMS　adsorption　process　were　performed.　The　results　show　that　the　specific　surface　area　of　FMS　is　significantly　increased　and　the　surface　structure　of　the　material　is　improved.　The　specific　surface　area　and　pore　volume　of　the　FMS　increased　from　27.38　m2/g　and　0.068　cm3/g　to　281.25　m2/g　and　0.16　cm3/g,　respectively.　Meanwhile,　the　average　pore　size　decreased　from　9.93　nm　to　2.21　nm.　This　could　cause　the　dense　coarse　particles　to　become　an　adsorbent　with　loose　porous　microstructure.　FT-IR　analysis　shows　that　iron　oxide　formed　in　the　iron　salt　impregnation　process　is　mainly　combined　with　O-H,　Al-O　and　Si-O　in　the　molecular　sieve　structure.　The　results　of　batch　experiments　with　4　mg/L　As5+　indicate　that　the　removal　rate　increases　by　about　70%　after　the　material　modification.　Moreover,　the　adsorption　process　is　in　accordance　with　the　quasi　second-order　adsorption　kinetics,　and　the　correlation　coefficient　(R2)　is　0.99,　indicating　that　the　chemical　adsorption　plays　an　important　role　in　the　adsorption　process.　The　Freundlich　isotherm　adsorption　model　fits　the　adsorption　data　well　with　a　correlation　coefficient　(R2)　is　0.98,　and　the　maximum　adsorption　capacity　is　calculated　to　be　9.9　mg/g.　Furthermore,　the　calculation　of　thermodynamic　parameters　ΔG,　ΔH　and　ΔS　find　that　temperature　increase　is　favorable　for　adsorption,　and　the　disorder　degree　between　solid　and　liquid　on　the　surface　of　the　material　increases　during　the　reaction.　Compared　with　FMS,　FMMS　can　effectively　improve　the　removal　performance　of　As3+.　The　initial　concentrationof　coexistence　conditions　were　ρ(As3+/As5+)=2.0,　4.0,　6.0　mg/L,　the　removal　rate　of　FMMS　is　increased　by　about　26.34%,　28.06%　and　28.09%,　respectively.　The　research　shows　that　the　use　of　iron　salt　impregnation　method　to　modify　MS　can　effectively　increase　the　adsorption　capacity　of　As5+　and　As3+,　and　can　give　full　play　to　the　practical　application　value　of　the　material.　©　2020,　Editorial　Board,　Research　of　Environmental　Sciences.　All　right　reserved.

Keyword：

Adsorption; Arsenic removal; Ferric salt; Molecular sieve

Community：

[ 1 ] [Xu, J.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 2 ] [Xu, J.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 3 ] [Xu, J.]Jinjiang Science and Education Park of Fuzhou University, Jinjiang, 362251, China
[ 4 ] [Xu, J.]College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China
[ 5 ] [Kang, D.]Jinjiang Science and Education Park of Fuzhou University, Jinjiang, 362251, China
[ 6 ] [Kang, D.]College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China
[ 7 ] [Zhao, Y.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 8 ] [Zhao, Y.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 9 ] [Wang, H.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 10 ] [Gong, T.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 11 ] [Gong, T.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 12 ] [Chen, Q.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 13 ] [Chen, Q.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 14 ] [Chen, Q.]Jinjiang Science and Education Park of Fuzhou University, Jinjiang, 362251, China
[ 15 ] [Chen, Q.]College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China
[ 16 ] [Qu, C.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 17 ] [Qu, C.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 18 ] [Qu, C.]Jinjiang Science and Education Park of Fuzhou University, Jinjiang, 362251, China
[ 19 ] [Qu, C.]College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China
[ 20 ] [Yang, T.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
[ 21 ] [Yang, T.]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China

Reprint 's Address：

[Yang, T.]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental SciencesChina

Email：

ytx13@126.com

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