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Carbon quantum dots implanted CdS nanosheets: Efficient visible-light-driven photocatalytic reduction of Cr(VI) under saline conditions

文献类型： 外文期刊

作者： Zhang, Yiheng 1 ; Zhao, Yanying 1 ; Xu, Zhenlan 2 ; Su, Heming 1 ; Bian, Xinyun 1 ; Zhang, Shishen 1 ; Dong, Xiaoping; 1 ;

作者机构： 1.Zhejiang Sci Tech Univ, Dept Chem, Hangzhou 310018, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Qual & Stand Agroprod, Hangzhou 310021, Zhejiang, Peoples R China

3.Jinan Univ, Sch Environm, Guangzhou 510632, Guangdong, Peoples R China

4.Jinan Univ, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 510632, Guangdong, Peoples R China

5.Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Zhejiang, Peoples R China

6.Texas A&M Univ, Sch Publ Hlth, Dept Environm & Occupat Hlth, College Stn, TX 77843 USA

关键词： Carbon quantum dots; Implantation; Cadmium sulfide nanosheets; Photocatalytic Cr(VI) reduction; Saline water

期刊名称：APPLIED CATALYSIS B-ENVIRONMENTAL （ 影响因子：19.503； 五年影响因子：17.291 ）

ISSN： 0926-3373

年卷期： 2020 年 262 卷

页码：

收录情况： SCI

摘要： Chromium(VI) (Cr(VI)), a toxic metal, is generally present together with ionic salts in industrial effluents. An efficient reduction of Cr(VI) to Cr(III) in saline water is an imperative issue but still a challenging task. Literature has rarely addressed reducing Cr(VI) effectively under saline conditions. Herein, carbon quantum dots (CQDs) were successfully implanted in the CdS nanosheets (CdS-NSs) to prepare nanocomposites (i.e., CCNs) for the first time to efficiently reduce Cr(VI) to Cr(III). The newly fabricated CCNs demonstrated superior performance to reduce Cr(VI) compared to pristine CdS-NSs and CQDs-deposited CdS nanosheets (i.e., CQD/CdS-NSs) in saline water. The nanostructures were examined by spectral and photoelectrochemical measurements as well as density functional theory (DFT) calculations. Results showed that CCNs facilitated the photo-electron transport and thus suppressed charge recombination via formation of micro-regional heterostructures. A lower band gap of CCNs relative to pristine CdS-NSs and CQD/CdS-NSs extended the light absorption spectrum. The optimal photocatalyst, denoted as CCNs-2, exhibited an efficiency of similar to 94% for photocatalytic Cr(VI) reduction within 10 min in water containing 1200 mg/L salts. The obtained rate constant of reduction of Cr(VI) was (2.62 +/- 0.04) x 10(-1) min(-1), approximately 4 and 3 times higher than that of pristine CdS-NSs and CQD/CdS-NSs, respectively. After 3 cycles, the CCNs-2 still showed an efficiency of similar to 78% aqueous Cr(VI) reduction within 10 min. Our results clearly presented that implantation relative to deposition of CQDs for CdS-NSs is a preferential strategy to enhance photocatalytic Cr(VI) reduction in saline water under visible light irradiation.

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