Tuning the crosslink structure of cationic hydrogel for enhanced chromium(VI) removal: The covalent and electrostatic co-crosslinked effects and adsorption mechanism

吸附 化学 阳离子聚合 水溶液 共价键 拉曼光谱 核化学 扫描电子显微镜 X射线光电子能谱 无机化学 高分子化学 化学工程 材料科学 有机化学 复合材料 工程类 物理 光学
作者
Shuoxun Dong,Yili Wang,Junyi Li,Daxin Zhang,Yanqin Zhou,Yao Tong
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:394: 124944-124944 被引量:34
标识
DOI:10.1016/j.cej.2020.124944
摘要

Elevated chromium(VI) (Cr(IV)) concentrations in drinking water or ground water can pose a public health concern. In this study, layered double hydroxides-isethionate (LDH-ise) assisted covalent and electrostatic co-crosslinked cationic hydrogel (CH-LDH-ise) was prepared as a potential adsorbent for Cr(VI) removal from aqueous solution. The scanning electron microscopy and X-ray diffraction results indicated that the LDH-ise sheets were exfoliated and crosslinked with the 3-(Acryloylamino) propyltrimethylaminium chloride (APTMACL) polymer chains. The adsorption of Cr(VI) onto the CH-LDH-ise was highly pH-dependent, and the removal efficiency by CH-LDH-ise composites was much higher than the CH (no crosslinker). The adsorption kinetic followed a pseudo-second-order, and reached equilibrium within 2 h. The corresponding maximum Cr(VI) adsorption capacity of CH-LDH-ise was 408.4 mg/g at the equilibrium concentration of 364.4 mg/L. The enhanced adsorption of Cr(VI) was also achieved in the presence of competing anions (including Cl−, NO3−, SO42−, HCO3−, SiO44−, and HA). Moreover, the in situ regeneration/recycle results implied the column adsorption capacity of CH-LDH-ise was 2250 bed volumes as the concentration of Cr(VI) decreased from 2.5 mg/L to 0.1 mg/L (The US drinking water standard for total chromium) at empty bed contact time = 6 min, and slightly decreased in the second recycle. The combination analysis of in situ Fourier transform infrared, in situ Raman, X-ray photoelectron spectra, and electron paramagnetic resonance revealed that the Cr(VI) capture mechanism was dominated by the electrostatic interactions and hydrogen bonding effect - the sources of the –N+(CH3)3 and –NH groups in CH-LDH-ise, respectively.
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