Hyperbranched magnetic polymer:highly efficient removal of Cr(Ⅵ)and application in electroplating wastewater  

作　　者：Nan Sun Qing Wu Lifang Jin Zichen Zhu Jianhui Sun Shuying Dong Haijiao Xie Chunyan Zhang Yanrui Cui 

机构地区：[1]Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control,Ministry of Education,and Henan Key Laboratory for Environmental Pollution Control,School of Environment,Henan Normal University,Xinxiang 453007,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第10期1568-1580,共13页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22076039 and 22176051);Science Foundation for Outstanding Youth of Henan Province(Grant No.222300420054);Excellent Science and Technology Innovation Team of Henan Normal University(Grant No.2021TD03).

摘　　要：By using a two-step hydrothermal method and trithiocyanuric acid(TTCA),2,4,6-trihydrazino-1,3,5-triazine(THT),and Fe_(3)O_(4)as raw materials,a spherical magnetic adsorbent polymer(TTCA/THT@Fe_(3)O_(4))was synthesized to achieve the efficient removal of Cr(VI)from wastewater.Under optimal adsorption conditions,the maximum adsorption capacity of TTCA/THT@Fe_(3)O_(4)for Cr(VI)can reach 1340 mg∙g‒1.Notably,the removal efficiency can approach 98.9%,even at the lower concentration of 20 mg∙L^(‒1)Cr(VI).For actual wastewater containing Cr(VI),the Cr(VI)concentration was reduced from 25.8 to 0.4 mg∙L^(‒1),a remarkable 20%lower than the current industry discharge standard value.A mechanism for the high adsorption performance of Cr(VI)on TTCA/THT@Fe_(3)O_(4)was investigated using Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,and density functional theory.It can be plausibly attributed to the formation of Cr/N and Cr/S coordination bonds.Additionally,surface electrostatic adsorption,reduction effects,and the spherical polymer structure increase the contact area with Cr(VI),maximizing adsorption.The synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@Fe_(3)O_(4)for Cr(VI)and total chromium in water.The resultant polymer has a simple preparation process,excellent adsorption performance,easy magnetic separation,and promising application for actual wastewater.

关 键 词：magnetic polymer chromium removal hydrogen bonding RECYCLABILITY actual wastewater 

分 类 号：O64[理学—物理化学]