OPTICAL MATERIALS
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2020
·
IF 2.779
Ya Nan Wang,Jin Li
ZnO-based semiconductor photocatalysts have emerged from many catalysts and become research hotspots as non-toxic, odorless, and readily available raw materials. Ce-doped ZnO and graphene composites with different concentrations (0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%) were only synthesized by hydrothermal method . The results show that Ce was successfully doped in ZnO by substituting zinc vacancy and compounded with graphene, and distributed uniformly in ZnO lattice. In terms of optical properties , compared with pure ZnO, the absorption of visible light is enhanced, the light response range is widened, the number of electrons that transition back to the ground state is reduced, which indicates that the photocarriers are effectively separated. Compared with the degradation efficiency of pure ZnO (20.28%), ZGCeO series samples showed superior photocatalytic performance, among which ZGCeO2 (2 wt%) samples had the highest photocatalytic activity and catalytic efficiency, and the degradation rate reached 99.12% within 80 min. In this experiment, 2 wt% is the best doping ratio.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 21
·6879
·
IF 3.4
Yuquan Wang,Yidong Xu,Xinjie Cai,Jinting Wu
Adsorption and photocatalysis are effective in removing organic pollutants from wastewater. This study is based on the memory effects of MgAl–layered double hydroxides (MgAl–LDHs) after high-temperature calcination. By introducing bismuth vanadate (BiVO4) during the reformation of the layered structure via contact with water, a composite material BiVO4/MgAl–LDHs with enhanced adsorption and visible light catalytic performance was synthesized. The effects of the calcination temperature, ratio, initial methylene blue (MB) concentration, and catalyst dosage on the adsorption and photocatalytic performance were investigated. The BiVO4/MgAl–LDHs showed better photocatalytic performance than the pure BiVO4and MgAl–LDHs. Under the optimal conditions, the proportion of MB adsorbed in 20 min was 66.1%, and the percentage of MB degraded during 100 min of photolysis was 92.4%. The composite photocatalyst showed good chemical stability and cyclability, and the adsorption-degradation rate was 86% after four cycles. Analyses of the adsorption and photocatalytic mechanisms for the composite material showed that synergistic adsorption and visible light photocatalysis contributed to the excellent catalytic performance of the BiVO4/MgAl–LDHs. A highly adsorbent photocatalytic composite material exhibiting outstanding performance was prepared via a simple, cost-effective, and environmentally friendly method, providing reference information for the removal of organic pollutants from liquids.Keywords:BiVO4;MgAl–LDHs;memory effect;adsorption-visible photocatalytic performance;organic pollutants
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
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2014
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IF 2.269
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Jinwei Li,Xin Shao,Keying Ding
BiOBr photocatalysts were synthesized by the combustion method. The BiOBr nanosheets possessing pure tetragonal BiOBr phase with high ratio of {001} facets exposure were obtained. The thickness of BiOBr nanosheets, in other words, the exposing proportion of {001} facets can be modulated through changing the added amount of ammonium bromide. The band gap energy of BiOBr was increased with larger exposing proportion of {001} facets. BiOBr with the thinest sheets exhibited the best photocatalytic activity of Rhodamine B under visible-light irradiation. To the end, the corresponding plausible growth mechanism of BiOBr was presented.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Jianing Li,Qiancheng Zhang,Juming Liu,Mengran Yu,Huiyan Ma,Jucai Yang,Sheng Ye,Tomas Ramirez Reina,Jian Liu
It still remains challenge for expanding the photo-response range of TiO 2 with dominant {0 0 1} facets due to the hardly achieving modification of the electronic structure without destroying the formation of TiO 2 high energy facets. Herein, we report the construction of carboxylate species modified TiO 2 nanosheets with dominant {0 0 1} facets by employing ethanol as a carbon source through a low-temperature (300 °C) carbonization method. The as-obtained samples were investigated in detail by using various characterization techniques. The results indicate that the carboxylate species derived from the oxidation and carbonization of ethanol are coordinated to the {0 0 1} facets in a bidentate bridging mode. The electron-withdrawing carboxylate species induce TiO 2 to form a lower valence band edge and a narrower bandgap, which enhances the oxidation ability of photogenerated holes and expands the photo-response range. The partially carbonized carboxylate species can also act as a photosensitizer to induce visible-light photocatalytic activity of TiO 2 nanosheets. In addition, the carboxylate species can further promote the separation of photogenerated charge carriers. The findings of this work may provide a new perspective for tuning the band structure of TiO 2 with dominant {0 0 1} facets and improving its photocatalytic performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
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2018
·
IF 2.943
Junkai Cao,Xue-Zhi Song,Xiaolan Kang,Zideng Dai,Zhenquan Tan
Herein, we report a facile one-pot solvothermal method to prepare unique oleic acid (OA) modified monodispersed mesoporous TiO 2 nanospheres with carboxylate ligands from the oleic acid in the bidentate chelating linkage mode. The mesoporous OA-TiO 2 nanospheres have a very large specific surface of nearly 510 m 2 /g. The oleic acid cannot only act as a binding ligand to control the shape of mesoporous TiO 2 nanospheres, but also be benefit to enhance the visible-light absorption. The mesoporous OA-TiO 2 nanospheres exhibit an excellent photocatalytic performance in the degradation of Rhodamine B and phenol under the visible light irradiation and show almost no attenuation after four cycles.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·15754-15765
·
IF 2.195
Sun Jialin,Huang Dejia,Liu Rui,Dai Jingtao,Chen Jian
To improve the visible-light photocatalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal-reduction method. The visible-light catalytic activity of as-prepared Ag/AgBr/TiO 2 was measured using tetracycline (TC) as the target pollutant. Characterizations by various techniques (SEM–EDS, XRD, XPS and DRS) and the quenching experiments with scavengers for possible active species (h + , • O 2 − and ·OH) were executed to probe the mechanism underlying the photocatalytic performance. Critical impacts from the catalyst and solution chemistry were evaluated in the mediums of TC solution, simulated wastewater and real wastewater sample. The results suggested that: (1) benefitting from the visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits fair stability and remarkable visible-light photocatalytic activity; (2) under optimized conditions, Ag/AgBr/TiO 2 provides higher visible-light catalytic activity than Ag/AgBr and TiO 2 ; (3) the coexisting inorganic ions with high concentration in the simulated wastewater sample depress TC photo-degradation, and the impacts varies with the species of inorganic ions; (4) COD removal rate about 65.5% in real wastewater sample proves that Ag/AgBr/TiO 2 can mineralize TC promptly and almost completely.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2018
·
IF 5.651
Chen Fan,Hongqiang Dong,You Liang,Jiale Yang,Gang Tang,Wenbing Zhang,Yongsong Cao
Cyhalothrin is lethally toxic to aquatic organisms and has caused adverse effects in the hydrosphere . It is urgent to develop efficient and sustainable material for its removal. High-quality HKUST-1 was rapidly synthesized by cholinium ionic liquids (ILs) in water at room temperature. Yields of HKUST-1 showed obviously positive correlation with Hammett values of ILs. When applying CuCl 2 as a copper salt, the yield of products was reached up to 95.5%, which was much higher than that of reported research. The reaction could be readily scalable with high space-time yield (242512 kg m −3 d −1 ). Additionally, ZrO 2 @HKUST-1 composite was successfully synthesized through a sol-gel method without complicated heat treatment. The whole process eliminates the use of environmentally unfriendly solvents/amines and enables the production of material at a reasonable cost. The obtained HKUST-1 and ZrO 2 @HKUST-1 possessed large pore volume (0.88–0.95 cm 3 g −1 ) and high surface area (1152–1484 m 2 g −1 ). The composite material was used for the adsorption/degradation of cyhalothrin and showed superior photocatalytic activity under moderate visible light, as compared to pure ZrO 2 , HKUST-1 and commercial TiO 2 samples. ZrO 2 @HKUST-1 displayed the high cyhalothrin adsorption capacity of 333 mg g −1 through π−π stacking, which facilitated more target molecules to contact the composite in a short time. ZrO 2 incorporating with HKUST-1 protected ZrO 2 nanoparticles from rapid agglomeration, thus narrowed the band gap of the composite. Moreover, the formation of a junction between HKUST-1 and ZrO 2 effectively reduced the recombination of photoinduced carriers in composite. Therefore, the novel ZrO 2 @HKUST-1 composite can be used as a sustainable efficient heterogeneous photocatalyst for the removal of organic pollutant.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
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IF 2.711
Jinlei Xie,Yefeng Yang,Haiping He,Ding Cheng,Minmin Mao,Qinxu Jiang,Lixin Song,Jie Xiong
Heterostructured semiconductor nanostructures have provoked great interest in the areas of energy, environment and catalysis. Herein, we report a novel hierarchical Ag 3 PO 4 /TiO 2 heterostructure consisting of nearly spherical Ag 3 PO 4 particles firmly coupled on the surface of TiO 2 nanofibers (NFs). The construction of Ag 3 PO 4 /TiO 2 heterostructure with tailored morphologies, compositions and optical properties was simply achieved via a facile and green synthetic strategy involving the electrospinning and solution-based processes. Owing to the synergetic effects of the components, the resulting hybrid heterostructures exhibited much improved visible light photocatalytic performance, which could degrade the RhB dye completely in 7.5 min. In addition, the coupling of Ag 3 PO 4 particles with UV-light-sensitive TiO 2 NFs enabled full utilization of solar energy and less consumption of noble metals, significantly appealing for their practical use in new energy sources and environmental issues. The developed synthetic strategy was considered to be applicable for the rational design and construction of other heterostructured catalysts.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 14
·2760
·
IF 4.967
Yu Ren,Ziyao Zhao,Wenwen Jiang,Guangyu Zhang,Yuxin Tan,Yongyin Guan,Long Zhou,Li Cui,Sung Woong Choi,Mei-Xian Li
In this study, Y2O3/TiO2-loaded polyester fabric was prepared to improve the catalytic activity of the TiO2and to increase its reuse efficiency. The samples were systematically characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FT-IR). Furthermore, the degradation performance of methyl orange in the presence of simulated visible light irradiation was also investigated. The results showed that the TiO2in the Y2O3/TiO2composite photocatalyst was suitably anatase. In addition, Y2O3/TiO2-loaded polyester fabric had higher photocatalytic performance than that of pure polyester fabric under visible light and the degradation rate reached 83% after 120 min of light exposure but remained above 50% after repeated exposure (three times). Compared to the pure polyester fabric, Y2O3/TiO2-loaded polyester fabric had self-cleaning effects in methyl blue and soy sauce solutions under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 3
·247
·
IF 4.501
Ping Ke,Danlin Zeng,Jiawei Cui,Xin Li,Yang Chen
A highly-efficient graphitic carbon nitride (g-C3N4) photocatalyst for visible light photodegradation of rhodamine B (RhB) and methyl orange (MO) simulating dyeing wastewater was synthesized by the thermal polycondensation of melamine. The photocatalysts were characterized by TG-DTG-DSC, XRD, EA, XPS, FT-IR, SEM, TEM, BET, PL and UV-vis DRS. The results showed that the photocatalytic performance of g-C3N4at a higher calcination temperature was significantly enhanced, and its photocatalytic activities for the photodegradation of RhB and MO were remarkably improved by 64.91% and 41.83%, respectively, which was mainly attributed to the satisfactory crystallinity, stable graphene-like structure, large surface area, and excellent optical properties. It was found that •O2−radicals and •OH radicals were the main active species for the photodegradation process by the free radicals trapping experiments and ESR analysis. The photodegradation mechanism of g-C3N4was proposed predicated using the characterization results.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Jianhua Hou,Ting Jiang,Xiaozhi Wang,Geshan Zhang,Ji-Jun Zou,Chuanbao Cao
It is still challenging to adjust the desired structure and heterojunction interface of photocatalytic materials by a facile and efficient strategy. In this manuscript, variable dimensional structured BiOI with surface oxygen vacancies (OVs) were prepared via an in-situ growth on mesoporous g-C 3 N 4 nanosheets through one-pot synthesis at room temperature, which possesses the p-n heterojunction required for the high-performance photocatalysis . By reducing the amount of the precursor of BiOI during the reaction, the morphology of BiOI gradually changed from 3D microspheres to 2D nanosheets and even 0D nanoparticles , which were conjugated with ultrathin g-C 3 N 4 nanosheets forming the composites with 2D/3D, 2D/2D, and 2D/0D structure, respectively. The catalyst with the best performance was determined to be the g-C 3 N 4 /BiOI with 2D/2D structure, which provides a larger contact surface, appropriate bandgap, and the higher utilization of visible light. The synergies between heterostructure and OVs can promote both the production and the separation of electron-hole effectively, and hence producing more oxidizing • O 2 − and h + with the energy input. Thereby, under visible light, the optimized combination of g-C 3 N 4 /BiOI heterojunction can exhibit the outstanding photocatalytic performance of degrading 99% rhodamine B within 2 h, which was 2.6 and 12.8 times faster than pure g-C 3 N 4 and pure BiOI, respectively. In addition, our work provides a feasible and adjustable approach to regulate the structure and heterojunction interface of photocatalysts as well as the discussion about the variable dimensional structure-activity relationship in photocatalysis .
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2016
·Vol. 49
·期 28
·285105
·
IF 2.772
Jiaqi Pan,Jing Li,Xiufang Zhang,Yingying Zheng,Can Cui,Zhiyan Zhu,Chaorong Li
Cotton cellulose nanofibers (CCNFs)/In2S3/Ag–CdS nanocomposites were prepared by a typical technical route which combined electrospinning and a chemical method. The results showed that the CCNFs/In2S3/Ag–CdS nanocomposites had a remarkable visible light photocatalytic property and cycling stability, which displayed a significant enhancement compared with that of pure In2S3. Through analysis, this enhancement could be mainly attributed to the multilevel structure of the composites.
研究领域:
材料科学
·
环境科学
✓ 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）