Catalysts
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2021
·Vol. 11
·期 8
·934
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IF 4.146
Yong Cheng,Xiuxiu Wang,Yu Mei,Dan Wang,Changchun Ji
Considering the photocatalytic performance of CDs, ZnO, and the unique porous nanostructure and stability of ZIF-8, we prepared ZnCDs/ZnO@ZIF-8 zeolite composites. The resultant material represented an enhanced ability for the photodegradation of TC compared with that of ZnCDs and ZnO. The photocatalytic degradation efficiency reached over 85%. The catalytic activity of the composites was maintained after four cycles. The experimental result indicated that ⋅O2radical was the active species in the reaction.Keywords:carbon dots;zeolite composites;photocatalytic;tetracycline
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Chaofan Zhang,Qiu Zhuang,Hao Wang,Xintong Ying,Ruoyang Ji,Daohu Sheng,Wei Dong,Aming Xie
Hexavalent chromium (VI) heavy metal contamination is considered a serious threat to human health and the environment. The photocatalytic reduction of Cr(VI) basically occurs in the acidic environment, severely limiting the application of photocatalysts for the reduction of Cr(VI). Therefore, we designed a microenvironment strategy to achieve efficient reduction of Cr (VI) under neutral conditions by introducing sulfonic acid onto the aromatic conjugated skeleton. A series of characterizations and experiments have shown that the sulfonated aromatic ring conjugated polymer (Arcp-SO 3 H) can efficiently remove Cr(VI) under neutral or even alkaline conditions. In neutral solutions, Arcp-SO 3 H has a rate constant of 0.054 min −1 within 90 min and has an efficiency of nearly 100 %, which is 16 times faster than before sulfonation (k = 0.0316 min −1 ). the Arcp-SO 3 H surpasses all organic polymers and most metal-based photocatalysts in the related field. The capture experiments have proved that •O 2 – is the main role of reducing Cr(VI), and e - is secondary, which is quite different from the mechanism reported in the previous literature. The efficiency of reducing Cr (VI) in the four-cycle experiment is still 96 %, which also proves that Arcp-SO 3 H has strong stability and reproducibility. Thus, Arcp-SO 3 H has great practical application potential in the treatment of wastewater, and microenvironmental strategies also offer new possibilities in the field of environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
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水处理技术
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光催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tong Zhou,Guohui Dong,Jiahao Geng,Kai Han,Chenyang Xiao
In this study, a novel Z-scheme + II-type ternary heterojunction nanocomposite was prepared by one-step solvothermal method using g-C 3 N 4 , FeS 2 and Fe 2 O 3 as raw materials. The successful preparation of this ternary heterojunction was confirmed by the structural analysis and the surface morphology study. Compared with g-C 3 N 4 , the ternary photocatalyst showed excellent photocatalytic performance for the degradation of tetracycline (TC). The enhancement of photocatalytic activity is mainly due to the increase of light absorption capacity, effective separation of carrier in space, and increase of electron transfer channels in this Z-Scheme + II-type composite system. The scavenger test and electron spin resonance spectroscopy show that O 2 − is the main oxidizing free radical in the photocatalytic system. Based on liquid chromatograph-mass spectrometer, a possible degradation pathway of TC was proposed. This study opens up a new idea for the design and synthesis of efficient Z-Scheme + II-type photocatalysts for environmental purification.
研究领域:
环境科学
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材料科学
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化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 21
·7378-7385
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IF 5.721
Mengna Ding,Fengyan Shi,Huijuan Zhu,Yuping Yang,Jiahui Zhong,Liulin Luo,Yuning Huo,Hexing Li
A hybrid Cu2O/TiO2 composite loaded on a Cu mesh (Cu2O/TiO2@Cu mesh) was developed via a supercritical solvothermal route. A uniformly distributed Cu2O/TiO2 p–n hetero-junction was stably coated on a Cu mesh, benefiting the visible-light harvesting. In comparison to electrochemistry and visible-light photocatalysis, the photoelectrochemistry process on the photoanode of the Cu2O/TiO2@Cu mesh presented improved bacterial inactivation activity for Acinetobacter baumannii. By means of the main active species of ˙O2− radicals, the photoelectrocatalytic process on the Cu2O/TiO2@Cu mesh also realized complete leakage of K+ ions, much stronger mineralization of the cell membrane and more efficient elimination of the self-recovery function, finally leading to cell death. In comparison, the electrochemistry process only led to the leakage of K+ ions without inactivation of bacteria, and the visible-light photocatalysis process induced partial leakage of K+ ions and cell mineralization after the death of most bacteria.
研究领域:
环境科学
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材料科学
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微生物学
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光电催化
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
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IF 5.9
Yuan Wei,Yubing Liu,Chao Liu,Xin Li,Kai Song,Runquan Wang,Wanping Chen,Guanghong Zhao,Ronghui Liu,Hongyu Wang,Gaofeng Shi,Guoying Wang
Graphitic phase carbon nitride (g-C3N4) demonstrates tremendous potential for photocatalytic degradation of organic pollutants, but its performance is severely limited by the high recombination of photogenerated electron–hole pairs. This study introduces an innovative approach oxalic acid-assisted thermal polycondensation to construct a series of oxygen-doped porous g-C3N4 (OCN) nanostructured materials, which simultaneously utilizes the heat-induced foaming mechanism of oxalic acid to achieve element doping modification. The results indicate that modified OCN-1.5 exhibited the optimal photocatalytic activity. Under visible light conditions, the degradation efficiency of OCN-1.5 catalyst toward bisphenol A (BPA, 30 mg L–1) reached 82.55% (240 min light irradiation). This represents a significant improvement of 60% compared to the traditional g-C3N4 catalyst. The mechanism is as follows: on the one hand, the doping of oxygen atoms alter the charge distribution and symmetry of g-C3N4, thereby enhancing the separation efficiency of photogenerated charge carriers. Furthermore, under visible light irradiation, it facilitates the formation of conjugated delocalized systems associated with e– and h+ on the surface, leading to an accelerated mineralization degradation of OCN and BPA at the interface. Additionally, the •O2– radicals generated from the interfacial reactions can also directly oxidize BPA simultaneously. On the other hand, the construction of a porous nanostructure provides a larger specific surface area and channels for the diffusion of charge carriers, thereby enhancing light capture and transfer. Moreover, this structure offers more active sites for the adsorption and degradation of pollutants. Therefore, the synthetic strategy proposed in this study overcomes the long-standing aggregation issue in the synthesis of g-C3N4, providing a perspective for the scalable preparation of high-performance g-C3N4 photocatalysts and the removal of organic pollutants.
研究领域:
材料科学
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环境科学
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化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）