State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Bioresour Technol. 2019 Dec;293:122038. doi: 10.1016/j.biortech.2019.122038. Epub 2019 Aug 21.
Poly(4-vinyl pyridine) decorated magnetic chitosan biopolymer (VMCP), as an absorbent and reductant, was prepared and used to remove hexavalent chromium (Cr(VI)) from aqueous solution. Compared with undecorated magnetic biopolymer, VMCP exhibited significantly improved removal performance under identical experimental conditions. The kinetics, isotherms, and thermodynamics of Cr(VI) adsorption onto VMCP were investigated. Results demonstrated that the maximum monolayer adsorption capacity of VMCP was 344.83 mg/g, which was considerably higher than most reported adsorbents. The mechanism for Cr(VI) removal was explored based on XPS and FTIR analyses. The main mechanisms were concluded to be Cr(VI) adsorption onto the positively charged VMCP surface and the reduction of Cr(VI) to Cr(III), followed by coordination between Cr(III) and N atoms. The easy regeneration, satisfactory reusability, and remarkable performance in column tests revealed the high potential of VMCP in treating Cr(VI)-contaminated water.
聚（4-乙烯基吡啶）修饰的磁性壳聚糖生物聚合物（VMCP）作为一种吸附剂和还原剂被制备出来，并用于从水溶液中去除六价铬（Cr(VI)）。与未修饰的磁性生物聚合物相比，在相同的实验条件下，VMCP 表现出了显著提高的去除性能。研究了 Cr(VI)在 VMCP 上的吸附动力学、等温线和热力学。结果表明，VMCP 的最大单层吸附容量为 344.83 mg/g，这明显高于大多数报道的吸附剂。根据 XPS 和 FTIR 分析，探讨了 Cr(VI)去除的机理。主要机制被归结为 Cr(VI)吸附到带正电荷的 VMCP 表面上，以及 Cr(VI)被还原为 Cr(III)，随后 Cr(III)与 N 原子之间发生配位。VMCP 在柱试验中表现出的易于再生、良好的可重复使用性和显著的性能，显示出其在处理 Cr(VI)污染水方面的高潜力。
