Zhao Yuelong, Zhang Peng, Zhang Wei, Fan Yali
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 411201, China.
Upgrading Office of Modern College of Humanities and Sciences of Shanxi Normal University, Linfen 041000, China.
Polymers (Basel). 2023 Feb 23;15(5):1117. doi: 10.3390/polym15051117.
In this study, CTS-GSH was prepared by grafting thiol (-SH) groups onto chitosan (CTS), which was characterized through Fourier Transform Infrared (FT-IR) spectra, Scanning Electron Microscopy (SEM) and Differential Thermal Analysis-Thermogravimetric Analysis (DTA-TG). The performance of CTS-GSH was evaluated by measuring Cr(VI) removal efficiency. The -SH group was successfully grafted onto CTS, forming a chemical composite, CTS-GSH, with a rough, porous and spatial network surface. All of the molecules tested in this study were efficient at removing Cr(VI) from the solution. The more CTS-GSH added, the more Cr(VI) removed. When a suitable dosage of CTS-GSH was added, Cr(VI) was almost completely removed. The acidic environment at pH 5-6 was beneficial for the removal of Cr(VI), and at pH 6, the maximum removal efficiency was achieved. Further experimentation showed that with 100.0 mg/L CTS-GSH for the disposal of 5.0 mg/L Cr(VI) solution, the removal rate of Cr(VI) reached 99.3% with a slow stirring time of 8.0 min and sedimentation time of 3 h; the presence of four common ions, including Mg, Ca, SO and CO, had an inhibitory effect on CTS-GSH's ability to remove Cr(VI) from the aqueous solution, and more CTS-GSH was needed to reduce this inhibiting action. Overall, CTS-GSH exhibited good results in Cr(VI) removal, and thus has good potential for the further treatment of heavy metal wastewater.
在本研究中，通过将硫醇（-SH）基团接枝到壳聚糖（CTS）上制备了CTS-GSH，并通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和差示热分析-热重分析（DTA-TG）对其进行了表征。通过测量Cr(VI)去除效率来评估CTS-GSH的性能。-SH基团成功接枝到CTS上，形成了一种具有粗糙、多孔和空间网络表面的化学复合材料CTS-GSH。本研究中测试的所有分子都能有效地从溶液中去除Cr(VI)。添加的CTS-GSH越多，去除的Cr(VI)就越多。当添加合适剂量的CTS-GSH时，Cr(VI)几乎被完全去除。pH为5-6的酸性环境有利于Cr(VI)的去除，在pH为6时达到最大去除效率。进一步的实验表明，用100.0 mg/L的CTS-GSH处理5.0 mg/L的Cr(VI)溶液，在慢速搅拌8.0 min和沉降3 h的情况下，Cr(VI)的去除率达到99.3%；Mg、Ca、SO和CO这四种常见离子的存在对CTS-GSH从水溶液中去除Cr(VI)的能力有抑制作用，需要更多的CTS-GSH来降低这种抑制作用。总体而言，CTS-GSH在去除Cr(VI)方面表现出良好的效果，因此在重金属废水的进一步处理方面具有良好的潜力。
