Hierarchical S-Scheme Heterostructure of CdIn2S4@UiO-66-NH2 toward Synchronously Boosting Photocatalytic Removal of Cr(VI) and Tetracycline,Inorganic Chemistry

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Hierarchical S-Scheme Heterostructure of CdIn2S4@UiO-66-NH2 toward Synchronously Boosting Photocatalytic Removal of Cr(VI) and Tetracycline
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-11-23 , DOI: 10.1021/acs.inorgchem.2c03240
Jiale He ₁ , Jianqiang Hu _{1,

2,

3} , Yingfei Hu ₄ , Shien Guo ₁ , Qingling Huang ₁ , Yuqin Li ₁ , Guobing Zhou ₁ , Tian Gui ₁ , Na Hu ₁ , Xiangshu Chen ₁

Affiliation

Developing highly efficient photocatalysts toward synchronously removing heavy metals and organic pollutants is still a serious challenge. Herein, we depict hierarchical S-scheme heterostructured photocatalysts prepared via in situ anchoring UiO-66-NH₂ nanoparticles onto the CdIn₂S₄ porous microsphere structures assembled with numerous nanosheets. In the mixed system of Cr(VI) and tetracycline (TC), the optimal photocatalyst (CIS@U66N-30) shows remarkable photocatalytic activities toward the synchronous removal of Cr(VI) (97.26%) and TC (close to 100% of) under visible-light irradiation for 60 min, being the best removal rates among those of the reported photocatalysts, and sustains the outstanding stability and reusability. Its reaction rate constants of Cr(VI) reduction and TC degradation are about 2.06 and 1.58 folds that in the single Cr(VI) and TC systems, respectively. The enhanced photocatalytic activities of CIS@U66N-30 mainly result from the following synergism: (1) its hierarchical structure offers abundant active sites, and the S-scheme migration mechanism of charge carriers in the heterostructure accelerates the separation and migration of the useful photoinduced electrons and holes with the high redox capability; (2) Cr(VI) and TC can serve as the electron scavenger for TC oxidation degradation and the hole and ^•OH scavenger for Cr(VI) reduction, respectively, further enhancing the separation and utilization efficiency of photoinduced electrons and holes. Besides, the possible TC degradation pathway and plausible S-scheme photocatalytic mechanism over CIS@U66N-30 for the concurrent elimination of Cr(VI) and TC are proposed.

中文翻译：

CdIn2S4@UiO-66-NH2 的多级 S 型异质结构同步促进光催化去除 Cr(VI) 和四环素

开发用于同步去除重金属和有机污染物的高效光催化剂仍然是一个严峻的挑战。_{在此，我们描绘了通过将 UiO-66-NH 2}纳米粒子原位锚定到 CdIn ₂ S ₄上制备的分层 S 型异质结构光催化剂由许多纳米片组装而成的多孔微球结构。在 Cr(VI) 和四环素 (TC) 的混合体系中，最佳光催化剂 (CIS@U66N-30) 对同步去除 Cr(VI) (97.26%) 和 TC (接近 100% of ) 在可见光照射下 60 分钟，是已报道光催化剂中去除率最好的，并保持了出色的稳定性和可重复使用性。其 Cr(VI) 还原和 TC 降解的反应速率常数分别是单一 Cr(VI) 和 TC 体系的 2.06 和 1.58 倍。CIS@U66N-30 增强的光催化活性主要来自以下协同作用：（1）其层次结构提供丰富的活性位点，异质结构中载流子的S型迁移机制加速了具有高氧化还原能力的有用光生电子和空穴的分离和迁移；(2) Cr(VI)和TC可以作为TC氧化降解的电子清除剂和空穴^•分别用于还原Cr(VI) 的OH 清除剂，进一步提高光生电子和空穴的分离和利用效率。此外，还提出了在 CIS@U66N-30 上同时消除 Cr(VI) 和 TC 的可能的 TC 降解途径和似是而非的 S 型光催化机制。

更新日期：2022-11-23

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