CATALYSIS SURVEYS FROM ASIA
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2021
·Vol. 25
·期 2
·148-158
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IF 3.106
Bao Er-Peng,Dong Ruichen,Zhang Shuoqing,Li Huan,Zhang Weiguo,Zou Jijun,Xu Qiang
The photocatalysis of graphtic carbon nitride (g-C 3 N 4 ) material has been widely used for the photocatalytic degradation of organic pollutants. However, g-C 3 N 4 still has some drawbacks, such as the high recombination of photo-induced electron–hole pairs and weak absorption of light irradiation. To further improve the photodegradation performance of g-C 3 N 4 , a novel composite photocatalyst (CoO/ PT-C 3 N 4 ) has been prepared by using a one-pot calcination method, in which cobalt oxide (CoO) as a cocatalyst are introduced on the rectangular hollow substrate of g-C 3 N 4 (PT-C 3 N 4 ), The CoO/PT-C 3 N 4 composite photocatalyst delivers an excellent photodegradation performance for diesel oil under a simulated sunlight. It exhibits a high degradation efficiency of 95.92% after light irradiation for 2 h, which is much higher than that of pristine PT-C 3 N 4 . Free radical capture experiments manifest that the free radical of ·O 2− plays a major role for the photodegradation and main active radicals abide by the sequence: ·O 2− > ·OH > h + . Moreover, the CoO/PT-C 3 N 4 composite photocatalyst delivers an excellent cyclic stability, which only degrades 8.71% photodegradation efficiency after 10 cycles. The improvement of CoO/PT-C 3 N 4 composite photocatalyst is ascribed to the formation of a heterojunction between CoO and PT-C 3 N 4 , which promotes the separation of photo-induced carriers. This work paves a new way for the exploration of photocatalyst for the organic pollutant degradation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2021
·Vol. 97
·期 5
·1267-1274
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IF 3.174
Ganning Zeng,Chunxian Hong,Yuan Ma,Mingming Du,Yan Zhang,Hongwei Luo,Bing Chen,Xiangliang Pan
BACKGROUND During the past two decades, aquatic polycyclic aromatic hydrocarbon (PAH) contamination has gained more and more attention, because of carcinogenicity or mutagenicity, toxicity, persistence and bioaccumulation, and a huge threat posed to entire ecosystems. RESULTS Sargassum horneri ( SH )-based carbon was pretreated with ethanol and formaldehyde, and obtained after pre-carbonization using H 2 SO 4 . The SH carbon powder was used to immobilize nano-TiO 2 in aquatic environment by a facile sol–gel method. The resulting C/TiO 2 catalyst was applied to photocatalytic aquatic naphthalene degradation under sunlight and showed the best naphthalene degradation performance of 83.77% under simulated sunlight, which could be attributed to the shape and structure contribution originating from SH . C/TiO 2 served as both adsorbent and catalyst in the degradation process of naphthalene, and the photodegradation process conformed to a double-exponential kinetic model, indicating that there are physical and chemical processes involved in the degradation. The mechanism for enhanced photocatalytic activity was verified as a synergistic mechanism resulting from SH -based carbon and TiO 2 , and showed industrial potential for removal aquatic PAH pollutants. CONCLUSIONS This study verifies that the synergistic effect resulting from SH -based carbon and TiO 2 enhanced the photocatalytic performance. © 2021 Society of Chemical Industry (SCI).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Zhengfeng Shen,Feifei Li,Jiangrui Lu,Zhidan Wang,Rui Li,Xiaochao Zhang,Changming Zhang,Yawen Wang,Yunfang Wang,Zhiping Lv,Jianxin Liu,Caimei Fan
Photocatalytic nitrogen fixation has been considered to be a safe, green, eco-friendly, and sustainable technology. However, photoinduced activation of inert dinitrogen is an important factor hindering the development of this technology. Herein, in-situ Fe 3+ doped flower-like BiOCl with highly active sites exposure was prepared by a solvent thermal method, which has excellent performance of N 2 photofixation. Compared with virgin BiOCl with no nitrogen fixation activity, Fe-BiOCl reached 30 μmol·L −1 ·h −1 ammonia evolution rate under simulated sunlight without any sacrificial reagent. Characterization results demonstrated that the enhancement of N 2 photofixation capacity was mainly attributed to the in-situ doped Fe 3+ in BiOCl, the doped Fe 3+ not only acts as a reaction center for N 2 activation also as an “electron transfer bridge” trapping and migrating electrons from BiOCl to N 2 molecules. Furthermore, the transformation of crystal facets from virgin BiOCl (0 0 1) to Fe-BiOCl (1 1 0) and (1 0 2) is more conducive for the exposure and accessibility of iron reactive sites. This work developed a potential strategy by in-situ introducing Fe 3+ active sites in BiOCl semiconductor substrate, which establishes a good basis for the application of semiconductor catalysts in nitrogen fixation.
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
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Meiyu Yuan,Yingying Zhu,Junjie Fu,Shiyu Xu,Xiaodong Wu,Zihan Wang,Man Yuan,Zihao Song,Sheng Cui
Photocatalytic degradation, as advanced oxidation methods with high efficiency and good stability, is considered a promising method to alleviate antibiotic pollution. Herein, we prepared a novel Zn 2 Ti 3 O 8 aerogel by a simple sol-gel method based on the advantages of the abundant pore structure of aerogel material and the high photocatalytic activity of zinc titanate . The Zn 2 Ti 3 O 8 aerogel shows a typical homogeneous structure and low band gap width (3.32 eV), which could achieve photogenerated carrier separation and transfer under simulated sunlight. The material has high specific surface area (120.1 m 2 /g) and abundant pore structure, which can provide multiple diffusion channels for pollutant molecules and generate massive reactive sites. In the absence of cocatalysts, the prepared Zn 2 Ti 3 O 8 aerogel can achieve more than 95% degradation efficiency for 50 mg/L of ofloxacin (OFL) contaminated solution in 60 min. Electrochemical impedance spectroscopy (EIS) and transient photocurrent test results display that Zn 2 Ti 3 O 8 aerogel exhibits the highest photocurrent density and lower charge transfer resistance. Meanwhile, the results of density functional theory (DFT) are consistent with the characterization results of electron spin resonance (ESR). The ·OH and ·O 2 − generated in the catalytic reaction could attack OFL molecules from different regions to achieve the purpose of decomposition. We believe that the as-prepared Zn 2 Ti 3 O 8 aerogels are expected to be used in the practical treatment of catalytic degradation of OFL and other antibiotic pollutants.
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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DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Da Wang,Yuyue Huang,Sisi Xiao,Qingjie Xie,Bianbadrolma,Huijuan Wang
This study applied the advanced oxidation process of simulated sunlight-induced periodate activation (SSL/PI) to degrade antibiotics. In order to enhance degradation, TiO 2 was also added to the SSL/PI system to create a synergistic effect (SSL/PI/TiO 2 ) and boost the degradation process. Sulfadiazine (SDZ) was selected as the target pollutant to investigate the enhancement from TiO 2 addition and the influential parameters on degradation. The obtained results showed that PI concentration was the most important parameter affecting SDZ degradation, while TiO 2 dosage and solution pH had less impact. Adding Fe 2+ and CO 3 2− inhibited SDZ degradation, while Cu 2+ and Cl − had minimal effect. DFT analysis indicated that the C4, C5, N23, N26, and N27 sites of the SDZ molecule were susceptible to be attacked by the formed reactive species. The key reactive species responsible for SDZ degradation in the SSL/PI/TiO 2 system were •O 2 − , 1 O 2 , IO 3 •, and •OH. LC-MS analysis identified 10 main byproducts during SDZ degradation, then three possible degradation pathways were predicted. The concentration detection of I 2 , I 3 − , and HOI, along with lettuce seed germination experiments, verified that the toxicity of the SDZ solution reduced after treatment with the SSL/PI/TiO 2 process.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Chenchen Xu,Qi Zhang,Yuyu Zhu,Huaiping Liu,Liangyun Yu,Qi Xu
The organic-inorganic eco-friendly semiconductor photocatalysts have the ability to effectively clear away organic pollutants under daylight, so the research on their synthesis with the controllable topography to improve its solar utilization and degradation activity has drawn the attention of many scholars. In this study, the organic-inorganic nanometer flower photocatalyst PDINH/TiO 2 with enhanced photoactivity was synthesized using PDINH (perylene 3,4,9, 10-tetracarbonate diimide) as the self-assembled carrier of nano-anatase TiO 2 . The CO⋯H Hydrogen bond between PDINH and TiO 2 numerators in the In-situ self-assembly PDINH/TiO 2 Nano photocatalyst enables valid chronic electrons delocalization and thereby accelerates the migration and separation photo-generated charges, so that it has significant photocatalytic dynamic character. This experiment discussed the performance of PDINH/TiO 2 photocatalytic degradation of phenol for the first time, and the consequents evidenced that PDINH/TiO 2 nanocomposite behaved a rapid degradation of phenol (6 ppm) in 6 h under the simulated sunlight. The operation briefness and the latent of making use of the sunlight capability urged the PDINH/TiO 2 to be a notable rising star for the photodegradation of the organic pollutants in water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Weiming Xiang,Fahao Xu,Dong Wan,Xing Wang,Fan Luo,Yong Chen
Chloroquine phosphate (CQ) is an antiviral drug for Coronavirus Disease 2019 and an old drug for treatment of malaria, which has been detected in natural waters. Despite its prevalence, the environmental fate of CQ remains unclear. In this study, the direct photodegradation of CQ under simulated sunlight was investigated. The effect of various parameters such as pH, initial concentration and environmental matrix were examined. The photodegradation quantum yield of CQ (4.5 × 10 −5 −0.025) increased with the increasing pH value in the range of 6.0–10.0. The electron spin resonance (ESR) spectrometry and quenching experiments verified that the direct photodegradation of CQ was primarily associated with excited triplet states of CQ ( 3 CQ*). The common ions had negligible effect and humic substances exhibited a negative effect on CQ photodegradation. The photoproducts were identified using high-resolution mass spectrometry and the photodegradation pathway of CQ was proposed. The direct photodegradation of CQ involved the cleavage of the C–Cl bond and substitution of the hydroxyl group, followed by further oxidation to yield carboxylic products. The photodegradation processes were further confirmed by the density functional theory (DFT) computation for the energy barrier of CQ dichlorination. The findings contribute to the assessment of the ecological risk associated with the overuse of Coronavirus drugs during global public health emergencies.
研究领域:
环境科学
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药理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
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IF 3.442
Dafeng Zhang,Changhua Su,Shujuan Yao,Hong Li,Xipeng Pu,Yanling Geng
BiPO 4 /BiOCl p-n heterojunction photocatalysts were successfully prepared by a facile in situ chemical transformation method with the aim of degrading rhodamine B under simulated sunlight. X-ray diffraction, field emission scanning electron microscopy , ultraviolet–visible diffuse reflectance spectroscopy , photoluminescence , and electrochemistry tests were used to characterized the structure, morphology, optical properties , and inhibited recombination of photoinduced charges. BiPO 4 /BiOCl composites exhibited significantly higher photocatalytic activity for the degradation of rhodamine B than pure BiOCl, and the apparent rate constant is 3.18 times higher than that of BiOCl. The significantly increased photocatalytic activity of the BiPO 4 /BiOCl composites can be ascribed to the formation of a p-n heterojunction , which can effectively boost the separation of photoinduced electron-hole pairs during the photocatalytic process. Additionally, the main active species were investigated and a plausible mechanism is proposed.
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
CRYSTENGCOMM
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2011
·Vol. 14
·期 3
·1038-1044
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IF 4.006
Ming Ge,Lu Liu,Wei Chen,Zhen Zhou
With Rhodamine B as a model compound, the photocatalytic oxidation of organic contaminants in aqueous solution was investigated within a cooperating porous BiVO4/H2O2 system under simulated sunlight irradiation. Peanut-shaped porous BiVO4 was prepared through a simple template-free solvothermal method with high yield, and was used in the cooperating catalyst/H2O2 system. The possible formation mechanism of peanut-shaped BiVO4 nanostructures was investigated. In the peanut-shaped BiVO4/H2O2 system, nearly complete degradation of Rhodamine B was observed after 60 min of irradiation under sunlight irradiation. The as-obtained porous BiVO4 photocatalyst displayed higher photocatalytic activity than those of the reference product hydrothermally synthesized and the photocatalyst P25 in the same catalyst/H2O2/sunlight system. The photocatalytic processes of the BiVO4/H2O2/sunlight system may consist of both OH˙ oxidation and direct hole attack. In addition, the peanut-shaped porous BiVO4 nanostructures were stable and maintained high photocatalytic efficiency during repeated recycles in the H2O2-containing system.
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
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiaoqin Liu,Jingjing Zhang,Mengye Jia,Rui Ma,Ruijuan Qu,Zunyao Wang,Zhaoguo Liu,Yu Jiang,Haoxiang Zhang,Yujia Bai,Riya Jin,Yina Qiao,Jiangtong Wu
An efficient nitrogen (N)-ZnO photocatalytic composite was synthesized and well characterized to demonstrate its superior photocatalytic performance as well as the degradation kinetics of 24 ILs in an N-ZnO/Xe lamp irradiation system, as well as the pathways and mechanisms of the photocatalytic degradation (PCD) of typical ionic liquids [OMIm]Br was systematically studied. To investigate the catalytic effect, nitrogen was synthesized from various inorganic and organic nitrogen compounds to ZnO. The NH 4 NO 3 -ZnO composite calcined at 300 °C with a molar ratio of NH 4 NO 3 to Zn(NO 3 ) 2 ·6H 2 O of 10:1 exhibited superior catalytic performance as assessed by SEM, TEM, FT-IR, UVDRS, BET surface area, XPS, and XRD characterizations. After 24 h of exposure to Xe lamp irradiation, all 24 ILs were significantly degraded by the introduction of 0.125 g/L of catalyst, whereas simulated sunlight alone resulted in minimal degradation. The pseudo-first-order rate coefficients ( k ) for PCD were closely related to the carbon chain length of the alkyl substituents and the type of anion. Multiple linear regression analysis indicated no linear correlation between the parameters E , H°, E th , and C v° from the Gaussian calculation and k . Conversely, a positive correlation was observed for E HOMO (B=0.742, β = 1.282, P = 0.011), q H+ (B=1.040, β = 3.284, P = 0.006), and G° (B=0.001, β = 5.400, P = 0.007) with k . Mass spectrometry analysis revealed that the primary PCD pathway for [OMIm]Br involved C-N and/or C-C bond breaking, mono-, di-, and tri-hydroxylation, single and double oxygen transfer, and bromo-substitution reactions.
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
Catalysis Science & Technology
·
2016
·Vol. 6
·期 22
·7967-7975
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IF 5.287
Jie Zhao,Yun Wang,Yingxuan Li,Xiu Yue,Chuanyi Wang
CeO2 is a basic promoter for CO2 photoreduction with H2O over TiO2-based catalysts, but there is still a lack of insight into the interaction of CeO2 with different TiO2 polymorphs and its effect on CO2 photoreduction. In this study, pure anatase, brookite, and rutile TiO2 and their respective hybrids with CeO2 were prepared, and their structural properties, optical properties, interfacial interaction and activity for CO2 photoreduction were systematically studied. The addition of CeO2 improved the activity for CO2 photoreduction under simulated sunlight irradiation, but the improvement depends on the phases of the TiO2. X-ray diffraction, macro-Raman spectroscopic and electron paramagnetic resonance measurements confirm the presence of Ti defects at the CeO2–rutile interfaces, implying a relatively strong interaction between CeO2 and rutile, which is beneficial for the interfacial separation of photogenerated charge carriers. As a result, CeO2/rutile shows the best enhancement of CO2 photoreduction among the studied CeO2/TiO2 systems. Moreover, different paramagnetic species were detected in the three TiO2 polymorphs. The O− radical anion in the anatase lattice could be oxidized to produce Ti3+ under UV-light irradiation, whereas the O2− radical anion on the surface of brookite TiO2 might retard CO production.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
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2019
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IF 4.888
Yanning Qu,Renliang Huang,Wei Qi,Mingbo Shi,Rongxin Su,Zhimin He
Zinc oxide (ZnO) nanomaterials are functional photocatalysts that show excellent photocatalytic activity, among which diverse morphologies, such as nanospheres, nanorods, nanoleaves, nanodisks, or nanoflowers, often possess different photocatalytic activities. In this study, we employed a simple ultrasonic treatment to controllably synthesize three types of three-dimensional (3D) fluffy ZnO nanoflowers with different nanostructures. Specifically, one nanoflower with smooth edges was formed via direct hydrothermal reaction without ultrasonic treatment (denoted as ZnO-0), and the other two with different jagged margins were obtained by ultrasonic treatment at 250 W and 950 W, respectively, before the hydrothermal procedure (denoted as ZnO-250 and ZnO-950). The results showed that the size, specific surface area, crystallite dimension, intrinsic donor defects and the signals of reactive radicals of ZnO nanoflowers all decreased with increasing ultrasonic intensity. Furthermore, the photocatalytic performance of such ZnO nanoflowers with similar morphologies but different nanostructures was investigated using methyl orange (MO) as a model pollutant. As expected, ZnO-0 possessed the highest photocatalytic activity with a kinetic constant of 0.0478 min −1 , while the value decreased to 0.0251 min −1 and 0.013 min −1 for ZnO-250 and ZnO-950 under simulated sunlight irradiation, respectively, suggesting that the photocatalytic efficiency of ZnO nanoflowers decreased due to the ultrasonic treatment. These findings provide structural insight into the photocatalytic activity of ZnO nanoflowers.
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
危险品化学品经营许可证（带存储）