RSC Advances
·
2017
·Vol. 7
·期 21
·12856-12870
·
IF 3.108
Yan Jiang,Zheng Jin,Chen Chen,Wubiao Duan,Bo Liu,Xidong Chen,Feihua Yang,Jianping Guo
SiO2/P25 (SP) composites doped with different contents of cerium were prepared by a hydrothermal process at a relatively low temperature in this experiment. The resulting Ce–SiO2/P25 (CSP) composites were successfully characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), N2-physisorption, UV-vis diffuse reflectance spectroscopy (DRS), and photoluminescence spectroscopy (PL). The photocatalytic activities of the as-obtained catalysts were evaluated for the degradation of organic dyes, including Methylene Blue (MB) and Reactive Red 4 (RR4), under visible-light irradiation. The best results were obtained for a cerium loading of 5 mM. The CSP-5 nanoparticle showed the 91.8% decomposition of MB and 90.2% decomposition of RR4 in the liquid phase at room temperature under visible-light irradiation in a photoreactor, and the corresponding hydrogen evolution rate was 2.315 mmol g−1, which was more efficient than that of pristine P25. Remarkably enhanced activities towards the photodecomposition of several organic compounds were observed depending on the synergistic effect between silicon and cerium. The Ce–SiO2/P25 structure leads to efficient light harvesting into the visible-light region by forming new energy levels inside the nanoparticles and then electron–hole recombination could be effectively inhibited. The BET surface area measurement was used to provide an insight into the enhanced photocatalytic activity of the CSP composites, which was also understood to be because of the relative enhancement of the adsorption of organic molecules on the photocatalyst surface. In addition, the effect of the initial pH values on the photocatalytic degradation of different dyes using CSP-5 was investigated. Finally, a good recyclability of CSP-5 was demonstrated compared to that of pristine P25. Herein, the photocatalytic mechanism has been concretely explained.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
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能源材料
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yiming Chen,Wenquan Gu,Li Tan,Zhimin Ao,Taicheng An,Shaobin Wang
Photocatalytic H 2 O 2 production by O 2 reduction is an environmental-friendly process for solar light conversion to chemical energy. In this work, Ti 3 C 2 MXene was used as a non-noble metal cocatalyst to load on P25 as Ti 3 C 2 /TiO 2 (TC/TO) photocatalysts for photocatalytic H 2 O 2 synthesis. A H 2 O 2 formation rate (179.7 μmol L −1 h −1 ) of the optimized 10 %-TC/TO composite was obtained to be over 21 folds as high as that of P25 under UV light. Radical quenching experiments and superoxide radical detection confirmed the superoxide radical as the primary intermediate, suggesting the O 2 reduction in two-step single-electron indirect reaction. The higher activity of TC/TO can be attributed to the functions of Ti 3 C 2 MXene in accelerating the separation and transfer of photogenerated electron-hole pairs, suppressing their recombination, and blocking the surface Ti OOH formation. This work proves the promising roles of Ti 3 C 2 MXene in the photocatalytic reaction and further expands their new applications in photocatalysis .
研究领域:
材料科学
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环境化学
·
光化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Nini Zhang,Xiangmei Li,Yanglong Guo,Yun Guo,Qiguang Dai,Li Wang,Wangcheng Zhan
Crystal engineering of metal oxide supports represents an emerging strategy to improve the catalytic performance of noble metal catalysts in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). Herein, Pt catalysts on a TiO2 support with different crystal phases (rutile, anatase, and mixed phase (P25)) were prepared for catalytic oxidation of 1,2-dichloroethane (DCE). The Pt catalyst on P25-TiO2 (Pt/TiO2-P) showed optimal activity, selectivity, and stability, even under high-space velocity and humidity conditions. Due to the strong interaction between Pt and P25-TiO2 originating from the more lattice defects of TiO2, the Pt/TiO2-P catalyst possessed stable Pt0 and Pt2+ species during DCE oxidation and superior redox property, resulting in high activity and stability. Furthermore, the Pt/TiO2-P catalyst possessed abundant hydroxyl groups, which prompted the removal of chlorine species in the form of HCl and significantly decreased the selectivity of vinyl chloride (VC) as the main byproduct. On the other hand, the Pt/TiO2-P catalyst exhibited a different reaction path, in which the hydroxyl groups on its surface activated DCE to form VC and enolic species, besides the lattice oxygen of TiO2 for the Pt catalysts on rutile and anatase TiO2. This work provides guidance for the rational design of catalysts for CVOCs.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wenjin Zhu,Jiaoyang Mi,Yuqin Fu,Donghui Cui,Changli Lü
A novel photocatalyst was developed by combining TiO 2 (P25), reduced graphene oxide (rGO), and multi-core@shell clustered carbon dots (CDs) by one-step hydrothermal method for the high efficiency visible-light degradation of organic dyes and antibacterial application. The as-synthesized CDs were used as photosensitizers of P25 to effectively broaden its visible absorption region from 410 to 800 nm. Meanwhile, the effects of different contents of CDs and rGO on the photocatalytic performance were systematically studied, in which 2% CDs/0.5% rGO/P25 composite displayed the most efficient photocatalytic degradation for organic dyes and photocatalytic antibacterial performance under visible light irradiation. The corresponding degradation rate constant of 2% CDs/0.5% rGO/P25 for RhB was 29, 2.8 and 1.3 times more than those of P25, rGO/P25, and CDs/P25 composite, respectively. This unique multi-core@shell clustered CDs played a vital role in improving the photocatalytic activity of the CDs/rGO/P25 composite, increasing visible light absorption, and promoting electron-hole pairs separation.
研究领域:
材料科学
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环境科学
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光催化技术
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2015
·
IF 4.099
A-nan Wang,Ying Teng,Xue-feng Hu,Long-hua Wu,Yu-juan Huang,Yong-ming Luo,Peter Christie
Diphenylarsinic acid (DPAA) is formed during the leakage of arsenic chemical weapons in sites and poses a high risk to biota. However, remediation methods for DPAA contaminated soils are rare. Here, the photocatalytic oxidation (PCO) process by nano-sized titanium dioxide (TiO 2 ) was applied to degrade DPAA in soil. The degradation pathway was firstly studied, and arsenate was identified as the final product. Then, an orthogonal array experimental design of L 9 (3) 4 , only 9 experiments were needed, instead of 81 experiments in a conventional one-factor-at-a-time, was used to optimize the operational parameters soil:water ratio, TiO 2 dosage, irradiation time and light intensity to increase DPAA removal efficiency. Soil:water ratio was found to have a more significant effect on DPAA removal efficiency than other properties. The optimum conditions to treat 4 g soil with a DPAA concentration of 20 mg kg − 1 were found to be a 1:10 soil: water ratio, 40 mW cm − 2 light intensity, 5% TiO 2 in soil, and a 3-hour irradiation time, with a removal efficiency of up to 82.7%. Furthermore, this method (except for a change in irradiation time from 3 to 1.5 h) was validated in nine different soils and the removal efficiencies ranged from 57.0 to 78.6%. Removal efficiencies were found to be negatively correlated with soil electrical conductivity, organic matter content, pH and total phosphorus content. Finally, coupled with electron spin resonance (ESR) measurement, these soil properties affected the generation of OH• by TiO 2 in soil slurry. This study suggests that TiO 2 photocatalytic oxidation is a promising treatment for removing DPAA from soil.
研究领域:
环境科学
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化学工程
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065515
·
IF 1.449
Xialin Peng,Yonggang Zhang,Ying Liu
Noble metal Ag nanoparticles were deposited on Ag3PO4/P25 heterojunction structure by ultraviolet (UV) light induction to construct Ag/Ag3PO4/P25 double heterojunction catalyst for efficient decomposition of phenacetin (PNT). X-Ray Diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman and photoluminescence (PL) spectroscopy analyses were employed to evaluate the microstructure, chemical structure and photocatalytic activity of synthesized catalyst materials. PL spectroscopy analyses revealed that a considerable enhancement in photochemistry activity of Ag3PO4/P25 due to the deposition of Ag. The effects of Ag3PO4 mass ratios, operating conditions on PNT degradation and catalyst stability were also investigated. Results showed that Ag/10% Ag3PO4/P25 under the operating conditions of catalysts concentration of 0.5 g L−1 and pH of 9.0 with UV light irradiation displayed a better photocatalysis degradation performance. When the concentration of PNT was 20 mg L−1, the removal rate of PNT and TOC obtained from Ag/Ag3PO4/P25 system were up to 97 % and 83%, respectively. The removal rate of PNT drops from 97% to 85% between the first and last cycles after 60-min conversion. Ag/Ag3PO4/P25 with a high catalytic reaction efficiency was ascribed to the deposition of Ag. Ag is an electron acceptor and Ag3PO4 have excellent electron conductivity in a heterostructure, the novel Ag/Ag3PO4/P25 composite catalyst could reduce the recombination rate of electron-hole pairs and prolong the lifetime of photogenerated electrons.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Fei Chen,Feng Wang,Qing Li,CaiYuan Cao,Xiang Zhang,Hua Ma,Yu Guo
Different catalyst supports, namely: commercial Degussa P25 TiO 2 , anatase TiO 2 (CC), γ-Al 2 O 3 , and lab-synthesized AlOOH were used to prepare Pt-based catalysts for the room temperature formaldehyde oxidation. XRD, BET and XPS were conducted to characterize the bulk structure of support, the oxidation state of surface elements and the ratio of oxygen in hydroxyls to the total surface oxygen, as well as textural properties of catalysts. For the first time, a long-term activity test at 0% relative humidity was conducted to investigate relationships between the activity of the Pt-based catalysts with Pt dispersion and oxidation state and the relative abundance of surface OH groups. Pt/AlOOH showed the best activity, whereas Pt/P25 TiO 2 gave the worst activity. We consider that both the surface hydroxyl groups and the Pt dispersion are indispensable, and both act synergistically. The specific surface area is not the decisive factor for the present reaction.
研究领域:
催化化学
·
环境催化
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材料化学
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表面科学
·
大气污染控制
✓ 已验证
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 24
·3484
·
IF 4.7
Yiwen Miao,Chenghao Zhang,Ya Sun,Chunlei Wang,Juntao Yan,Sunhua Deng,Ruan Chi
A series of flexible polyacrylonitrile/TiO2(PAN/P25) multi-porous nanotubular membranes were successfully constructed by facile electrospinning combined with an ethylene glycol solvothermal induce strategy. The effects of P25 dosage and solvothermal time on the morphology of samples were systematically investigated, which were characterized in terms of surface morphology, microstructure, specific surface area, thermal analysis, wettability, photoelectrochemical and fluorescence spectra. Rhodamine B (RhB) andEscherichia coli(E. coli) were employed as simulated pollutants to evaluate photocatalytic degradation and antibacterial properties of the PAN/P25-3 multi-porous nanotubular membrane. The PAN/P25-3 membrane exhibited the highest photocatalytic degradation efficiency, with 96.1% degradation of RhB within 120 min under a xenon lamp light source and a photocatalytic inactivation rate of 95.8% forE. coliunder 365 nm monochromatic light irradiation. The photocatalytic degradation mechanism of the PAN/P25-3 multi-porous nanotubular membrane for RhB was deduced from the results of 3D-EEM fluorescence and scavenger experiments of reactive species. Additionally, the cyclic photodegradation experiments demonstrated that the PAN/P25-3 membrane maintained excellent stability and photocatalytic performance after multiple degradation cycles, confirming its potential for sustainable wastewater treatment applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Bo Wang,Jianhua Sha,Shuaishuai Chen,Weiyan Yin,Yude Li,Qinyan Yue,Haiyan Yu,Shiping Xu
Floating photocatalytic materials provide an effective way for the practical application of photocatalytic technology. In this study, a highly efficient and stable polypropylene photocatalytic floating ball (CC-P25/BC@PP) was designed and synthesized via firstly coupling Degussa P25 with biochar (BC) through click chemical reaction, followed by loading the composites on PP hollow ball with help of titanate coupling agent. Statistical analysis found that, compared to the PP ball decorated with simple P25/BC mixture (denoted as Mix-P25/BC@PP), click chemistry connection not only significantly increased the effective loading limit of P25/BC composites on PP ball, but also enhanced the adsorption-photocatalysis synergy between TiO 2 and biochar. As a result, the degradation rate constant of ciprofloxacin (CIP) was nearly doubled. Moreover, due to the strengthened connection between P25/BC composite with PP ball, stability of CC-P25/BC@PP was improved significantly, and the shedding rate of active ingredients from PP ball during cycling experiment, acid/alkali soak and ultrasonic oscillation were suppressed 3.80–6.71 times compared to Mix-P25/BC@PP. Therefore, the highly efficient and stable PP photocatalytic floating ball based on click chemistry reaction showed strong practical application potentials.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yuying Dong,Yanqing Jiao,Baojiang Jiang,Chungui Tian
The excellent photocatalytic performance of a commercial ZnO (C-ZnO-1) was demonstrated. This ZnO showed approximately 3.8, 7.4 and 5.2 times greater activity than P25 TiO 2 for the degradation of rhodamine B, methyl orange and methyl blue, respectively. After compounding with Ag, the catalyst showed record-high activities for the degradation of the three dyes (approximately 9.5, 13, and 50 times that of P25). The high activity of C-ZnO-1 is attributed to the low concentration of bulk defects (i.e., a high degree of crystallinity) and the relatively high number of surface defects (i.e., a higher ratio of surface hydroxyl oxygen).
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Jinze Lyu,Junxian Gao,Min Zhang,Yanhong Wang,Dandan Hu,Juan Yi,Junbo Zhong,Ji Li,Shuo Wang
The distribution of bulk and surface defects significantly affects the separation and injection of photogenerated charge carriers. In this study, we provide a strategy of SiO 2 -shell-enhanced F modification to optimize the distribution of bulk and surface defects. The effects of SiO 2 coating and F modification on the physical structure, the separation behavior of photogenerated charge carriers, and the photocatalytic activity of P25 were studied by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, surface photovoltage spectroscopy, and toluene degradation experiments. Results showed that the removal rate of toluene over SiO 2 -F-modified P25 was significantly higher than those over P25 and F modified P25. The SiO 2 -shell-enhanced F modification simultaneously increased the content of surface Ti 3+ and reduced the bulk defects, thereby enhancing the separation of charge carriers. Furthermore, F doped at surface exerted a strong catalytic effect on the removal of toluene, whereas F doped in lattice caused the recombination of photogenerated charge carriers. The SiO 2 coating and calcination treatment significantly increased the amount of F ions doped at TiO 2 surface and inhibited F doping in lattice.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Huiyu Yang,Jinyi Zhou,Zijian Duan,Xin Liu,Bo Deng,Jian Fang,Weilin Xu
In this work, visible light total reflective SiO 2 @TiO 2 core-shell catalyst was synthesized by atomic layer deposition (ALD). This core-shell catalyst processing a total reflection character against full visible light favors the total effective traveling length of visible light inside the TiO 2 shell. Subsequently, higher catalyst temperature under visible light irradiation expands the light absorbing window of amorphous TiO 2 to full visible light due to its negative temperature coefficient of the forbidden bandwidth. Boosted photothermal conversion efficiency (145% that of amorphous TiO 2 ) can be achieved to exhibit a 17β-estrogen degradation rate 1.5 times that of the commercial P25 (a mixed TiO 2 crystal of 20% rutile and 80% anatase) and 2.9 times catalytic velocity that of P25. The boosted catalytic performance of SiO 2 @TiO 2 core-shell catalyst is attributed by expanded visible-light absorption, boosted photothermal conversion efficiency, and prolonged carrier lifetime.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）