Anatase quantum dots decorated silica/carbon lamellas for removal of antipsychotic drugs via adsorption-photocatalysis and toxicity evaluation. (September 2022)

• Record Type: Journal Article
• Authors: Li, Runqi; Hu, Xingyu; Yu, Yutang; Xu, Weicheng; Chen, Dongdong; Zhu, Ximiao; Tang, Yiming; Yao, Lang; Qin, Jingjun; Fang, Jianzhang; Liu, Zhang; Fang, Zhanqiang
• Is Part Of: Chemosphere. Volume 303:Part 1(2022)
• Publication Date: 2022-09
• Subjects: Anatase TiO2 -- Quantum dots -- Chlorpromazine -- Adsorption-photocatalysis synergy -- Toxicity evaluation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.134972
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this work, discrete quantum dots of crystallized anatase TiO2 are successfully anchored on carbon nanosheets containing amorphous SiO2 via templated self-assembly and pyrolysis routes. The novel hybrid photocatalyst of TiO2 /C/SiO2 exhibits well coupled adsorption and visible light photocatalysis on chlorpromazine (CPZ) and the rate constants are 0.0223 and 0.0198 min −1, respectively. The direct photocatalytic degradation of CPZ under static conditions reaches 91.1% within 3 h while a removal rate of 31.4% for CPZ could be retained under dynamic flow conditions, and the improved performance could be attributed to enhanced adsorption via SiO2 /C and highly exposure of TiO2 QDs surface. Based on the trapping experiments, ESR, LC-MS, and toxicity evaluation, O2 − free radicals are identified as main reactive species for CPZ degradation along three possible pathways, with reduced toxicities for its intermediates. The cell viability tests of photocatalytic-degraded solutions and the catalyst exhibit negligible toxicities for both intermediates and the material, suggesting the novel composite of TiO2 /C/SiO2 as an environmental friendly photocatalyst for pharmaceutical wastewater treatment. Graphical abstract: Image 1 Highlights: Anatase quantum dots anchored on carbon lamellas as a biocompatible photocatalyst. Pharmaceutical wastewater purification by coupled adsorption and photocatalysis. Photocatalytic degradation pathways of CPZ and toxicities evolution of intermediates. Cell viability assay assessment of CPZ photocatalytic degraded byproducts.