Mechanochemically Activated Microsized Zero-Valent Iron/Pyrite Composite for Effective Hexavalent Chromium Sequestration in Aqueous Solution,Journal of Chemical & Engineering Data

当前位置： X-MOL 学术 › J. Chem. Eng. Data › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mechanochemically Activated Microsized Zero-Valent Iron/Pyrite Composite for Effective Hexavalent Chromium Sequestration in Aqueous Solution
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-03-04 , DOI: 10.1021/acs.jced.9b01110
Xingyu He ₁ , Xiaobo Min _{1,

2} , Tianyu Peng ₁ , Feiping Zhao _{1,

2} , Yong Ke _{1,

2} , Yunyan Wang _{1,

2} , Guanghua Jiang ₁ , Qiujing Xu ₁ , Jingwen Wang ₁

Affiliation

The activity of pyrite (FeS₂) and microsized zero-valent iron (mZVI) is greatly limited by the passivating layer. This study indicated that hexavalent chromium (Cr(VI)) could be effectively sequestered by mechanochemically activated mZVI/FeS₂ composite (MA-mZVI/FeS₂), which was obtained from the mZVI/FeS₂ mixture by mechanochemical technology. Compared with MA-mZVI and MA-FeS₂, the Cr(VI) removal performance of MA-mZVI/FeS₂ was significantly improved at a mZVI/FeS₂ molar ratio of 1:9. The effects of initial concentration, coexisting anions, reaction time, and initial pH on Cr(VI) sequestration by MA-mZVI/FeS₂ were investigated. During the removal process, the concentrations of different valence states of chromium and iron were measured to explore the Cr(VI) removal mechanism. Based on the experiments and characterizations, surface sorption accounted for 41.38% and reduction accounted for 58.62% at the Cr(VI) adsorption equilibrium of MA-mZVI/FeS₂. The ball milling destroyed the passivating layer of MA-mZVI/FeS₂, resulting in a rough surface. The corrosion of mZVI can be significantly accelerated by FeS₂ due to the strong interaction between mZVI and FeS₂ in MA-mZVI/FeS₂, which led to the enhanced Cr(VI) sequestration. The practical application indicated that MA-mZVI/FeS₂ had good Cr(VI) removal performance in real water samples. This study revealed that MA-mZVI/FeS₂ can be a hopeful adsorbent for effective Cr(VI) sequestration in aqueous solution.

中文翻译：

机械化学活化的零价铁/硫铁矿复合物，用于水溶液中有效的六价铬螯合

钝化层极大地限制了黄铁矿（FeS ₂）和微米级零价铁（mZVI）的活性。这项研究表明，通过机械化学技术从mZVI / FeS ₂混合物获得的机械化学活化的mZVI / FeS ₂复合物（MA-mZVI / FeS ₂）可以有效隔离六价铬（Cr（VI））。与MA-mZVI和MA-FeS ₂相比，在mZVI / FeS ₂摩尔比为1：9的情况下，MA-mZVI / FeS ₂的Cr（VI）去除性能得到显着改善。初始浓度，共存阴离子，反应时间和初始pH对MA-mZVI / FeS ₂螯合Cr（VI）的影响被调查了。在去除过程中，测量了不同价态态的铬和铁的浓度，以探索Cr（VI）去除机理。根据实验和表征，在MA-mZVI / FeS ₂的Cr（VI）吸附平衡下，表面吸附占41.38％，还原量占58.62％。球磨破坏了MA-mZVI / FeS ₂的钝化层，导致表面粗糙。由于在MA-mZVI / FeS _2中mZVI和FeS ₂之间的强相互作用，FeS ₂可以显着加速mZVI的腐蚀，从而增强了Cr（VI）的螯合。实际应用表明MA-mZVI / FeS ₂在真实水样中具有良好的Cr（VI）去除性能。这项研究表明，MA-mZVI / FeS ₂可以成为有效螯合水溶液中Cr（VI）的理想吸附剂。

更新日期：2020-04-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文