Synthesis of new sulfhydryl flocculant PAM-GSH and its performance in removing Mn (Ⅱ)

doi:10.11949/j.issn.0438-1157.20181486

Abstract

Abstract:

Polyacrylamide (PAM) was used as the main chain skeleton, glutathione (GSH) was used as the grafting monomer. According to the Mannich reaction mechanism, condensation was carried out under the participation of formaldehyde, GSH was grafted onto PAM, and the polyacrylamide-glutathione (PAM-GSH) containing multiple coordinating groups was finally prepared. The PAM-GSH was characterized by FTIR, SEM-EDS and TG-DSC. The results showed that PAM-GSH is a thiol-functionalized PAM with pleated and porous pores. It has a network structure, which enhances its adsorption and sweeping net catching ability, and has good thermal stability in the range of 26—200℃. The coagulation experiment indicated that when the dosage of PAM-GSH was 84.48 mg/L, the concentration of Mn(Ⅱ) was 10.0 mg/L, the initial turbidity was 10.40NTU, and the initial pH value was 9.0, the best removal efficiency of Mn(Ⅱ) could be achieved. The existence of K(Ⅰ) and Al(Ⅲ) inhibited the removal of Mn(Ⅱ). Zeta potential analysis showed that the flocculation mechanism of PAM-GSH was mainly chelation, adsorption bridging and sweep netting.

Key words: complexes, waste water, coagulation, amide reaction, Zeta potential

摘要：

以聚丙烯酰胺(PAM)为主链骨架，谷胱甘肽(GSH)为接枝单体，依据Mannich反应机理，在甲醛参与下缩合，将GSH接枝到PAM上，合成具有多种配位基团的絮凝剂聚丙烯酰胺-谷胱甘肽(PAM-GSH)。傅里叶红外光谱(FTIR)、扫描电镜与能谱分析(SEM-EDS)和差热热重(TG-DSC)表征结果表明：PAM-GSH是一种巯基官能团化的PAM，形貌褶皱多孔隙，呈网状结构，增强了其吸附和网捕卷扫能力，并且在26~200℃范围，具有良好的热稳定性。混凝实验研究表明：当PAM-GSH投加量为84.48 mg/L、Mn(Ⅱ)浓度为10.0 mg/L、初始浊度为10.40NTU、初始pH为9.0时，对水样中的Mn(Ⅱ)去除效果最优；K(Ⅰ)、Al(Ⅲ)两种阳离子的存在对Mn(Ⅱ)的去除有抑制作用。Zeta电位分析表明：PAM-GSH絮凝机制主要是螯合作用、吸附架桥和网捕卷扫作用。

关键词: 配合物, 废水, 混凝, 酰胺反应, Zeta电位

CLC Number:

TU 991.22

Peng ZHANG, Yulu WANG, Wenjie DING, Wenlin ZHAO. Synthesis of new sulfhydryl flocculant PAM-GSH and its performance in removing Mn (Ⅱ)[J]. CIESC Journal, 2019, 70(5): 1932-1941.

张鹏, 王雨露, 丁文杰, 赵文麟. 新型巯基絮凝剂PAM-GSH的合成及除Mn(Ⅱ)性能研究[J]. 化工学报, 2019, 70(5): 1932-1941.

Figures/Tables 11

Fig.1 Synthesis route of PAM-GSH

Fig.2 Effect of synthetic conditions on performance of PAM-GSH for Mn (Ⅱ) removal

Fig.3 FTIR of PAM and PAM-GSH

Fig.4 SEM picture of PAM (a) and PAM-GSH (b)

Fig.5 EDS picture of PAM, GSH and PAM-GSH

Fig.6 TG-DSC picture of PAM-GSH

Fig.7 Effect of PAM-GSH dosage on Mn(Ⅱ) removal

Fig.8 Effect of initial turbidity on Mn(Ⅱ) removal

Fig.9 Effect of pH on Mn(Ⅱ) removal

Fig.10 Effect of cation concentration on Mn(Ⅱ) removal

Fig.11 Relation between PAM-GSH and Zeta potentials at different pH

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