In　this　paper,　chitosan　hydrogel　beads　were　modified　with　gemini　surfactant　C　12　-4-C　12　 · 2Br　and　then　used　for　the　adsorption　and　removal　of　Congo　red　dye.　The　effects　of　pH,　inorganic　salt,　temperature,　shaking　rate,　and　surfactant　concentration　were　investigated　in　detail.　The　gemini　surfactant　concentration　was　the　main　factor,　and　the　maximum　adsorption　amount　was　observed　at　0.5%　C　12　-4-C　12　 · 2Br.　The　Sips　isotherm　model　fit　well　with　the　equilibrium　experimental　data,　and　the　values　of　the　heterogeneity　factor　(n)　indicated　heterogeneous　adsorption.　The　adsorption　kinetics　was　found　to　follow　the　pseudo-second-order　rate　model　better　than　the　pseudo-first-order　rate　model.　©　2017,　Copyright　©　Taylor　&　Francis　Group,　LLC.