文献类型：期刊文献

英文题名：The roles of a pillared bentonite on enhancing Se(VI) removal by ZVI and the influence of co-existing solutes in groundwater

作者：Dong, Huaping[1];Chen, Ya[1];Sheng, Guodong[1];Li, Jianfa[1];Cao, Jie[1];Li, Zhanfeng[1];Li, Yimin[1]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China

年份：2016

卷号：304

起止页码：306

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000367699200033)、、EI(收录号：20154601546045)、Scopus(收录号：2-s2.0-84946616098)、WOS

基金：This work was supported by the National Natural Science Foundation of China (21177088, 21207092, 21477081 and 21577093). The authors thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time. We also thank Prof. Yuying Huang for his great help.

语种：英文

外文关键词：Pillared bentonite; Zero-valent iron; Selenate; Removal; Co-existing solutes

外文摘要：The zero-valent iron permeable reactive barrier (ZVI-PRB) is a promising technology for in-situ groundwater remediation. However, its long-term performance often declined due to the blocked reactive sites by corrosion products and by interference of co-existing solutes. In order to address these issues, a pillared bentonite (Al-bent) was homogeneously mixed with ZVI for removing selenate (Se(VI)) from simulated groundwater in column experiments. The Se(VI) removal was enhanced because first Al-bent could facilitate the mass transfer of Se(VI) from solution to iron surface and accelerate Se(VI) reduction. XANES analysis indicated that Se(VI) was almost completely reduced to Se(0) and Se(-II) of less toxicity and solubility by the ZVI/Al-bent mixture, and the buffering effect of Al-bent could maintain the pH at a lower level that favored the Se(VI) removal. Besides, Al-bent could transfer the corrosion products away from iron surface, leading to the enhanced reactivity and longevity of ZVI. The inhibition on reactivity towards Se(VI) in both the single ZVI and the ZVI/Al-bent systems increased in the order of Cl-