Functionalized polyvinyl alcohol aerogel for efficient and selective removal of arsenite from aqueous matrices
Functionalized polyvinyl alcohol aerogel for efficient and selective removal of arsenite from aqueous matrices
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功能化聚乙烯醇气凝胶，用于高效、选择性地去除水基体中的亚砷酸盐
DOI：
10.1016/j.cej.2022.138232
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发表时间：
2022
影响因子：
15.1
通讯作者：
Hasegawa Hiroshi
中科院分区：
文献类型：
--
作者：
Biswas Foni B.;Das Sandip;Nishimura Tatsuya;Endo Masaru;Fukuda Mayu;Morita Futo;Mashio Asami S.;Taniguchi Tsuyoshi;Maeda Katsuhiro;Hasegawa Hiroshi
从废水和地下水中去除砷(As)已成为一个关键的环境问题。在这项研究中，一种新型的吸附剂，二硫代氨基甲酸酯官能化的交联型聚乙烯醇(DFCPVA)气凝胶被成功地开发出来解决这个问题。对气凝胶去除水基质中亚砷酸盐(AsIII)的能力进行了分析，结果表明，在酸性和中性条件下，该气凝胶对AsIII都表现出良好的吸附性能。DFCPVA的吸附效率不受溶液中存在的竞争金属离子的显著阻碍。准二级动力学模型较好地描述了吸附过程，且Langmuir模型比Freundlich模型更接近平衡吸附等温线。预计DFCPVA对AsIII的吸附速度会很快，因为在15分钟内就能达到平衡。等温线研究表明，DFCPVA的最大吸附容量为1微克−。吸附实验、傅里叶变换红外光谱(FTIR)和X射线吸收光谱(XAS)研究表明，DFCPVA对AsIII的吸附遵循络合机理。在40℃下保存1个月，DFCPVA的吸附容量略有下降；但在冰箱中(即冷藏)，其吸附容量不会降低。
The removal of arsenic (As) from wastewater and groundwater has become a critical environmental issue. In this study, a novel sorbent, dithiocarbamate-functionalized cross-linked polyvinyl alcohol (DFCPVA) aerogel was successfully developed to address this issue. The aerogel was analyzed for its ability to remove arsenite (AsIII) from aqueous matrices, and it showed excellent sorption performance for AsIIIunder both acidic and neutral conditions. The AsIIIsorption efficiency of DFCPVA was not significantly hindered by competing metal ions present in the solution. The pseudo-second-order kinetic model described the sorption well, and the Langmuir model fit the equilibrium sorption isotherm more closely than the Freundlich model. It was anticipated that the sorption rate of AsIIIby DFCPVA would be rapid, as equilibrium was established in 15 min. The maximum sorption capacity of DFCPVA was 535 µmol g−1, as determined by the isotherm study. Sorption experiments, Fourier transform infrared (FTIR) spectroscopy, and X-ray absorption spectroscopy (XAS) studies demonstrated that the sorption of AsIIIby DFCPVA followed a chelation mechanism. The sorption capacity of DFCPVA was slightly decreased when stored at 40 ℃ for one month; however, the capacity was not reduced when it was stored in a refrigerator (i.e., cold condition).