PAM-GSH的制备及对锰、铜、镉的去除研究
发布时间：2019-03-16 19:34
【摘要】：随着国家“十三五”期间的环境指标与污染控制的体系出炉,我国的近年的水、土重金属污染防治工作也在不断强化。在我国环境污染物控制指标日渐严格的大背景下,重金属污染治理与防治工作中对重金属废水的排放标准要求也逐步增高。混凝法作为传统水处理工业的主要方法,不需要再次投入推广成本兼具有原理简单、操作方便、成本低廉等一系列优点,应当引起关注。本研究通过对常见的有机高分子混凝剂聚丙烯酰胺(PAM)进行优化制备,并以其为原料通过酰胺化反应,将还原型谷胱甘肽(GSH)上的重金属强配位基团接枝到PAM分子链上,制备出新型巯基化高分子混凝剂(PAM-GSH)。在PAM本身所具有的较好的吸附架桥能力的基础上,强化了其对重金属配位螯合的能力。使之成为含巯基的有机高分子混凝剂,更加有效地去除水中的重金属。以AM为原料,通过水溶液聚合法优化制备有较高分子量的PAM。其后以制得PAM与GSH为原料,通过酰胺化反应制备PAM-GSH。制备过程中对质量比、反应时间、体系pH值、甲醛量等条件对产物PAM-GSH的性能影响进行了研究。最终得到了优化后合成条件:当PAM/GSH质量比为16:3,反应时间为2h+2h,甲醛用量为2ml,pH值为5。在此条件下合成的PAM-GSH产物进行重金属模拟废水处理实验,取得较好实验结果,Mn(Ⅱ)去除率可以达到99.1%。对优化条件下合成的PAM-GSH产物进行了结构表征,表征手段主要有傅里叶红外光谱分析、扫描电镜、能谱分析分析、差热-热重分析和X射线衍射分析。证明了产品确实由PAM与GSH反应得到,并成功将强配位基团巯基引入PAM分子链。产品能够在常温状态下稳定存在,热稳定性较强,表面粗糙存在孔洞结构,呈现出一定的网状空间结构,具备一定的吸附效果。以含锰、铜、镉的模拟废水为处理对象,通过单因素法或者正交实验设计考察了PAM-GSH在分别不同水力条件、水质特征下的对锰、铜、镉的去除效果,主要包括:PAM-GSH投加量、反应时间、静置时间、pH值、浊度、K~+/Al~(3+)离子浓度等几个影响条件。结果表明:PAM-GSH分别对锰、铜、镉都有一个最佳去除条件,水中的K~+、Al~(3+)对锰、铜、镉的的去除效果都起到抑制作用,且K~+、Al~(3+)浓度越高抑制作用越强。
[Abstract]:With the development of environmental indicators and pollution control system during the 13th five-year Plan period of China, the prevention and control of heavy metal pollution in water and soil has been strengthened in recent years. Under the background of stricter control index of environmental pollutants in our country, the discharge standard of heavy metal wastewater in the treatment and prevention of heavy metal pollution is gradually increasing. Coagulation, as the main method of traditional water treatment industry, does not need to be put into promotion again. It has a series of advantages, such as simple principle, convenient operation and low cost, which should be paid attention to. In this study, we optimized the preparation of polyacrylamide (PAM), a common organic polymer coagulant, and used it as raw material to graft heavy metal strong coordination groups from reduced glutathione (GSH) onto PAM molecular chain through amidation reaction. A novel mercapto polymer coagulant (PAM-GSH) was prepared. On the basis of the good adsorption bridging ability of PAM itself, the ability of coordination and chelation of heavy metals was enhanced. It can be used as an organic polymer coagulant containing sulfhydryl groups to remove heavy metals from water more effectively. Preparation of PAM. with higher Molecular weight by Aqueous solution Polymerization with AM as Raw material Then, using PAM and GSH as raw materials, PAM-GSH. was prepared by amidation reaction. The effects of mass ratio, reaction time, pH value and formaldehyde content on the properties of PAM-GSH were studied. Finally, the optimized synthesis conditions were obtained: when the mass ratio of PAM/GSH was 16 渭 3, the reaction time was 2 h, the amount of formaldehyde was 2 ml, and the pH value was 5. Under these conditions, the synthetic PAM-GSH products were used to treat heavy metal wastewater, and the results showed that the removal rate of, Mn (鈪，
本文编号：2441902
[Abstract]:With the development of environmental indicators and pollution control system during the 13th five-year Plan period of China, the prevention and control of heavy metal pollution in water and soil has been strengthened in recent years. Under the background of stricter control index of environmental pollutants in our country, the discharge standard of heavy metal wastewater in the treatment and prevention of heavy metal pollution is gradually increasing. Coagulation, as the main method of traditional water treatment industry, does not need to be put into promotion again. It has a series of advantages, such as simple principle, convenient operation and low cost, which should be paid attention to. In this study, we optimized the preparation of polyacrylamide (PAM), a common organic polymer coagulant, and used it as raw material to graft heavy metal strong coordination groups from reduced glutathione (GSH) onto PAM molecular chain through amidation reaction. A novel mercapto polymer coagulant (PAM-GSH) was prepared. On the basis of the good adsorption bridging ability of PAM itself, the ability of coordination and chelation of heavy metals was enhanced. It can be used as an organic polymer coagulant containing sulfhydryl groups to remove heavy metals from water more effectively. Preparation of PAM. with higher Molecular weight by Aqueous solution Polymerization with AM as Raw material Then, using PAM and GSH as raw materials, PAM-GSH. was prepared by amidation reaction. The effects of mass ratio, reaction time, pH value and formaldehyde content on the properties of PAM-GSH were studied. Finally, the optimized synthesis conditions were obtained: when the mass ratio of PAM/GSH was 16 渭 3, the reaction time was 2 h, the amount of formaldehyde was 2 ml, and the pH value was 5. Under these conditions, the synthetic PAM-GSH products were used to treat heavy metal wastewater, and the results showed that the removal rate of, Mn (鈪，
本文编号：2441902
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