Functionalized polyacrylamide by xanthate for Cr (VI) removal from aqueous solution
Functionalized polyacrylamide by xanthate for Cr (VI) removal from aqueous solution
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通过黄原酸盐官能化聚丙烯酰胺，用于从水溶液中去除 Cr (VI)
DOI：
10.1016/j.cej.2015.12.043
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发表时间：
2016-03
影响因子：
15.1
通讯作者：
Yunsi Liu
中科院分区：
文献类型：
--
作者：
Guocheng Zhu;Junfei Liu;Jun Yin;Zhongwu Li;Bozhi Ren;Yongjun Sun;Peng Wan;Yunsi Liu
长期以来，六价铬[Cr(VI)]一直被认为是一种剧毒物质，会影响水质。在本研究中，通过在聚丙烯酰胺(PAM)上接枝黄原酸酯基团制备了一种改性聚丙烯酰胺(MPAM)，并用傅立叶变换红外光谱(FT-IR)、X射线衍射、扫描电子显微镜和能量色散X射线能谱(EDS)对其进行了表征。通过测定水环境中六价铬的去除效率，评价了新型金属络合剂MPAM的性能。红外光谱表明，MPAM是一种黄原酸酯功能化的PAM，其官能团为。MPAM是一种结晶材料，其主相类似于Na2CO3·H2O，在络合过程中没有明显变化。然而，该阶段的强度显著增加，这可能是由于配体基团的大小增加所致。EDS结果表明，络合产物是一个复杂的MPAM形成过程的结果，而铬。在制备过程中，当CS2/NaOH摩尔比为1：3时，MPAM收率较高。随着MPAM投加量的增加，铬(VI)的去除效率提高。在适当的投加量下，水中的六价铬几乎可以完全去除。酸性环境有利于铬(VI)的去除，在pH值为5时具有较好的去除效果。进一步研究表明，当MPAM投加量为4.7 mg/L，处理含10 mg/L铬(VI)的溶液时，铬(VI)的去除效率可达98%以上。K+、Na+、Ca~(2+)等阳离子的存在对铬(VI)的去除有抑制作用，因此需要使用较高的MPAM投加量。总体而言，在所测试的铬(VI)浓度下，官能化聚丙烯酰胺对水溶液中的铬(VI)具有良好的去除效果。
Hexavalent chromium [Cr (VI)] has long been considered as a highly toxic substance that will impact water quality. In this study, a modified polyacrylamide (MPAM) was prepared by grafting a xanthate group onto polyacrylamide (PAM), which was characterized by the Fourier transform infrared (FT-IR) spectrum, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectrometry (EDS). The performance of the new metal chelating agent, MPAM, was assessed by measuring Cr (VI) removal efficiency from an aqueous environment. FT-IR spectroscopy demonstrated that the MPAM is a xanthate functionalized PAM with functional groups of . MPAM is a crystal material, and its main phase is similar to Na2CO3·!H2O, which was not significantly changed in the chelation process. However, there was a significant increase in the intensity of the phase, which was possibly attributed to an increase in the size of ligand group. EDS results demonstrated that the chelation product was the result of a complex MPAM formation process, and Cr. MPAM had better yields with CS2/NaOH molar ratio of 1:3 during the preparation. Cr (VI) removal efficiency increased with the increase of MPAM dosage. With an appropriate dosage, aqueous Cr (VI) could be almost completely removed. An acidic environment was conducive to Cr (VI) removal with better removal efficiency achieved at pH 5. Further illustration indicated that with 4.7 mg/L of MPAM dosage for treatment of solution containing 10 mg/L Cr (VI), a Cr (VI) removal efficiency of over 98% could be achieved. The presence of the cations, such as K+, Na+, and Ca2+had an inhibiting effect on Cr (VI) removal; thus, there was a need to use a higher MPAM dosage. Overall, the functionalized polyacrylamide exhibited good Cr (VI) removal efficiency from aqueous solution with tested Cr (VI) concentrations.
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影响因子：
13.6
作者：
M. G. da Fonseca;Michelle M de Oliveira;L. N. Arakaki
通讯作者：
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影响因子：
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作者：
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影响因子：
2.3
作者：
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通讯作者：
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影响因子：
15.1
作者：
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通讯作者：
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