Simultaneous degradation of RhB and Reduction of Cr(VI) by MIL-53(Fe)/PANI with the mediation of organic acid
Simultaneous degradation of RhB and Reduction of Cr(VI) by MIL-53(Fe)/PANI with the mediation of organic acid
复制标题
MIL-53(Fe)/PANI 在有机酸介导下同时降解 RhB 和还原 Cr(VI)
DOI：
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发表时间：
2021-08
影响因子：
3.8
通讯作者：
WANG Xinbo
中科院分区：
文献类型：
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作者：
WANG Wanyuan;WEN Chengxin;ZHENG daoyuan;Chunhu Li;BIAN Junjie;WANG Xinbo
摘要通过在MIL-53（Fe）表面原位沉积聚苯胺（PANI）的方法制备了MIL-53（Fe）/聚苯胺复合物，并研究了其对RhB和Cr（VI）的同时去除催化性能。在pH=2的条件下，用盐酸和柠檬酸调节pH，RhB和Cr（VI）的去除率均达到98%以上。结果表明，MIL-53（Fe）/PANI对RhB的降解具有明显的pH响应，而柠檬酸则促进了Cr（VI）的光还原。UV-Vis光谱、电化学阻抗谱和光电流响应实验表明，MIL-53（Fe）/PANI具有比MIL-53（Fe）更好的光响应和载流子迁移能力。瞬态吸收光谱也表明，在MIL-53（Fe）表面沉积导电聚合物后，光生载流子的寿命延长。清除剂实验表明，活性组分主要为·O2-和·OH。结合活性评价结果，提出了MIL-53（Fe）/PANI光催化氧化RhB和还原Cr（VI）的可能机理。导电聚合物的加入可以有效提高催化剂在酸性条件下的光响应性，同时柠檬酸也为多种污染物的协同降解提供了新的中介。该催化剂具有良好的活性和稳定性，可用于紫外可见光下酸性水的放大净化。
Abstract MIL-53(Fe)/polyaniline composite was prepared by in situ depositing PANI on the surface of MIL-53(Fe) and their catalytic performances on the simultaneous removal of RhB and Cr(VI) were investigated. The elimination efficiency of both RhB and Cr(VI) reached more than 98% under pH=2 where hydrochloric acid and citric acid were used to adjust the pH. The results indicated that MIL-53(Fe)/PANI revealed an obvious pH response to the degradation of RhB, while citric acid promoted the Cr(VI) photoreduction. UV-Vis spectra, EIS, and photocurrent response experiments showed that MIL-53(Fe)/PANI had a better light response and carrier migration ability than MIL-53(Fe). The transient absorption spectra also exhibited that the lifetimes of photo-generated carriers were prolonged after the conductive polymer deposition on the MIL-53(Fe) surface. Scavenger experiments demonstrated that the main active species were •O2- and •OH. Combined with activity evaluation results, and the possible photocatalytic mechanism of MIL-53(Fe)/PANI on RhB oxidation and Cr(VI) reduction was proposed. The addition of conductive polymer can effectively improve the light response of the catalyst under acidic conditions, and meanwhile citric acid also provided a new mediation for the synergistic degradation of multiple pollutants. Good activity and stability of the catalysts made the scale-up purification of acid water feasible under UV-Vis light.