Advanced Sustainable Systems
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2022
·Vol. 6
·期 5
·2100516
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IF 6.737
Dawang Zhou,Li Wang,Fangzhou Zhang,Jing Wu,Huaping Wang,Jianping Yang
Fiber-based microplastic (FMP) pollution in the wastewater of the textile industry and urban sewage has become an emerging issue and a potential threat to marine life and human health. However, most reported reduction strategies, such as physical adsorption/filtration and chemical-catalytic degradation are limited by the secondary pollution caused by the desorption of FMPs and inferior degradation performance. Advanced technologies for efficient FMP control remain largely insufficient and underdeveloped. This work reports a Z-scheme Bi 2 O 3 @N-TiO 2 heterojunction synthesized by a solvothermal and wet-impregnation strategy. Bi 2 O 3 @N-TiO 2 degrades ≈10.23 ± 1.91 wt% of polyethylene terephthalate (PET)-FMPs (a major FMP existing in the environment) at pH = 9, which is nearly three times higher than that at pH = 7. Experimental results show that the hydrolysis of PET-FMPs in alkaline media is the main reason for the superior performance. Importantly, the hydrophilic, weight-average molecular weight and crystallinity of PET-FMP are the key factors affecting the photocatalytic degradation performance of PET-FMPs. This study demonstrates an eco-friendly strategy for remediation of FMP contamination.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Weiwen Wang,Hui Zhao,Peng Pan,Kang Xue,Zisheng Zhang,Jihai Duan
In order to enhance the photocatalytic activity of TiO 2 under visible light, Ag nanoparticles were introduced into tridoped B–C–N–TiO 2 (TT) catalyst by photoreduction deposition. Ag/B–C–N–TiO 2 (ATT) catalysts with the functions of reducing band gap and carrier recombination were prepared. At the same time, the effect of the amount of Ag on the photocatalytic performance of ATT catalyst was investigated. Through XRD , XPS , PL and other characterization methods, the (211)/(101)/Ag interface heterojunction mechanism similar to the traditional Z-scheme heterojunction was proposed. The intervention of Ag nanoparticles changed the P–N interface heterojunction between (211)/(101) to the (211)/(101)/Ag Z-scheme interface heterojunction. The results show that ATT catalyst exhibits the highest photocatalytic activity when the molar amount of Ag is 0.005% with the MB degradation rate of the ATT catalyst (0.01707 min −1 ), which is 14.59 times of TiO 2 (0.00117 min −1 ) and 2.02 times of TT (0.00847 min −1 ). In addition, the four cycles efficiencies of ATT for MB degradation were all above 94.00%.This study reveals the possibility of construction of Z-scheme heterojunctions between precious metal nanoparticles and different interfaces of TiO 2 , and provides a reference for the construction of Z-scheme interface heterojunctions.
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
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Tong Chang,Yajun Hou,Fengze Wang,Yumei Wang,Yushui Bi
Semiconductor photocatalyst materials based on TiO 2 are potential photosensitizers for photodynamic therapy of cancer. Despite its effectiveness under ultraviolet light, pure TiO 2 shows almost no photocatalytic activity under visible light because of its wide intrinsic band gap energy (anatase, 3.2 eV). Besides, TiO 2 has no magnetic delivery property. In this study, an inorganic nanocomposite, N-TiO 2 /SiO 2 /Fe 3 O 4 , is successfully prepared in three steps by means of co-precipitation, Stöber and sol-gel methods. Deep characterization results by XRD , TEM, XPS , UV–vis DRS, FL and magnetic hysteresis loop reveal that N-TiO 2 /SiO 2 /Fe 3 O 4 has core-shell structure, magnetic property and visible-light-response capability. As a potential photosensitizer for photodynamic therapy, it shows a stronger photodynamic suppression effect on proliferation of HeLa cells than TiO 2 under the irradiation of xenon light.
研究领域:
材料科学
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生物医学工程
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肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Osin Oluwatomiwa A.,Yu Tianyu,Cai Xiaoming,Jiang Yue,Peng Guotao,Cheng Xiaomei,Li Ruibin,Qin Yao,Lin Sijie
The photocatalytic activity of TiO2 based photocatalysts can be improved by structural modification and elemental doping. In this study, through rational design, one type of carbon and nitrogen co-doped TiO2 (C, N-TiO2) photocatalyst with mesoporous structure was synthesized with improved photocatalytic activity in degrading 4-nitrophenol under simulated sunlight irradiation. The photocatalytic degradation efficiency of the C, N-TiO2 was much higher than the anatase TiO2 (A-TiO2) based on absorbance and HPLC analyses. Moreover, using zebrafish embryos, we showed that the intermediate degradation compounds generated by photocatalytic degradation of 4-nitrophenol had higher toxicity than the parent compound. A repeated degradation process was necessary to render complete degradation and non-toxicity to the zebrafish embryos. Our results demonstrated the importance of evaluating the photocatalytic degradation efficiency in conjunction with the toxicity assessment of the degradation compounds.
研究领域:
环境科学
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材料科学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
研究领域:
材料科学
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环境科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Quan Li,Xing Wang,Xiaolan Cui,Xin Liu,Wentai Wang
Hydrogen peroxide (H 2 O 2 ) is a major transmitter of redox signals during chemical processes. Cost-effective and easy-to-operate sensors for H 2 O 2 are in high demand in a variety of fields. A novel photoelectrochemical (PEC) sensor for H 2 O 2 detection was investigated, using BiOBr/TiO 2 NAs/FTO (BiOBr/TNAs) as a PEC electrode which is obtained by successive ionic layer adsorption and reaction (SILAR) method. This non-enzymatic PEC BiOBr/TNAs electrode shows excellent selectivity, stability, and reproducibility for H 2 O 2 detection in optimizing modes. The linear relationship is in a broad range from 4 to 1800 μM (R 2 = 0.994) and a detection limit of 0.65 μM (S/N = 3). In the detection of H 2 O 2 in apple juice and milk real samples, the BiOBr/TNAs show outstanding recovery ranging from 98.0 % to 102.0 %, indicating great potential in practical applications. Meanwhile, the p-n heterojunction formed between BiOBr and TiO 2 improves the utilization of visible light and effectively promotes the separation of photogenerated electrons and holes. This work provides a new strategy for the non-enzymatic detection of hydrogen peroxide in PEC mode.
研究领域:
材料科学
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分析化学
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光电化学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2018
·Vol. 8
·期 8
·326
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IF 3.465
Peng Sun,Jun Zhang,Wenxiu Liu,Qi Wang,Wenbin Cao
In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO2(N-TiO2) at 25 °C under visible light irradiation. Experimental results show that the photoreaction coefficientkpmincreased from 3.992 × 10−6mol·kg−1·s−1to 11.55 × 10−6mol·kg−1·s−1along with increasing illumination intensity. However, the adsorption equilibrium constantKLdecreased from 1139 to 597 m3·mol−1when the illumination intensity increased from 36.7 × 104lx to 75.1 × 104lx, whereas it was 2761 m3·mol−1in the absence of light. This is contrary to the fact thatKLshould be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficientkpmwas introduced to the expression ofKLand the compensation form was denoted asKm.KLis an indicator of the adsorption capacity of TiO2whileKmis only an indicator of the coverage ratio of TiO2surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.Keywords:modified L-H model;N-TiO2;photocatalytic degradation;benzene
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xuan Wang,Hao Ding,Chunhong Wang,Run Zhou,Yangzi Li,Wei Li,Weihua Ao
The superhydrophobic self-cleaning coatings with reversible adhesion to water droplets have attracted much attention due to the unique and wonderful self-cleaning performance. In this paper, amorphous SiO 2 microspheres (A-SiO 2 ) and nano-TiO 2 particles (N-TiO 2 ) were used to fabricate A-SiO 2 /N-TiO 2 composites by wet grinding, and then they were modified with Hexadecyltrimethoxysilane (HDTMS) and sprayed onto the surface of substrate to obtain a A-SiO 2 /N-TiO 2 @HDTMS coating. The water contact angle (WCA) and contact angle hysteresis (CAH) of the coating were 157.2° and 2.7°, respectively. After UV irradiation, the WCA decreased to 140.9°, and water droplets stuck onto the coating surface even the coating was turned upside down. Significantly, the coating surface returned to its original superhydrophobic state after dark storage for 8 h, showing a self-healing property. Furthermore, methyl orange solution was degraded by the as-prepared coating under UV irradiation. Moreover, the as-prepared coating maintained its self-cleaning performance after being placed outdoors for 3 months, exhibiting the potential to be used outdoors for a long time. The as-prepared coating not only has excellent properties but also the advantages of environmental protection. Therefore, this research provides an advanced method to prepare self-cleaning coatings environmentally.
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
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Yan Cao,Zipeng Xing,Yingcai Shen,Zhenzi Li,Xiaoyan Wu,Xu Yan,Jinlong Zou,Shilin Yang,Wei Zhou
Mesoporous black Ti 3+ /N-TiO 2 spheres with high crystallinity are fabricated by a facile evaporation-induced self-assembly (EISA) method, using urea as nitrogen resource, combined with a mild calcinations (350 °C) after an in-situ hydrogenation under an argon atmosphere. The prepared materials are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicate the prepared sample is uniform mesoporous black Ti 3+ /N-TiO 2 spheres with high crystallinity of anatase, high surface area of ∼100 m 2 g −1 , large pore size of 6.5 nm and narrow band gap of 2.11 eV, could be easily controlled with the diameter from 200 to 800 nm. Meanwhile, the photoresponse extends to near-infrared region owing to Ti 3+ and N codoping. The visible-light-driven photocatalytic degradation ratio of methyl orange is up to 96% and photocatalytic hydrogen production rate is ∼150 μmol h −1 , which are several times higher than that of pristine TiO 2 . Besides, the possible photocatalytic mechanism is proposed. The excellent photocatalytic activity can be ascribed to N and Ti 3+ doping resulting in high visible light utilization and enhanced separation of photogenerated charge carriers, and the mesoporous networks offering more surface active sites.
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 CATALYSIS
·
2017
·
IF 6.844
Yan Cao,Zipeng Xing,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Tianyu Zhao,Ziyuan Xiu,Shilin Yang,Wei Zhou
Mesoporous black N-TiO 2−x hollow spheres are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process, coupled with an etching procedure and an in-situ solid-state chemical reduction strategy. The resultant black N-TiO 2−x hollow spheres with high crystallinity possess a narrow band gap of ∼2.37 eV, a large specific surface area of ∼128 m 2 g −1 , and a well defined hollow sphere structure, which exhibit excellent visible-light-driven photocatalytic performance for degradation of phenol , reduction of Cr(IV), and hydrogen production . The photocatalytic reaction apparent rate constants (k) of the black N-TiO 2−x for phenol degradation and Cr(IV) reduction are ∼5 and 6 times higher than that of pristine TiO 2 , and hydrogen production rate for N-TiO 2−x is ∼160 μmol h −1 , which is ∼7 folds higher than that of pristine one. The excellent photocatalytic and photoreduction property can be attributed to the synergy effect of N and Ti 3+ codoping narrowing the band gap, the high specific surface area offering more surface active sites, and the mesoporous hollow structure favoring light harvesting and refraction.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Jiaojiao Guan,Daorong Li,Jiahui Feng,Peng Xu,Zhaonian Li,Siqi Ge,Hongxia Chen,Kunfeng Zhang
The removal of ammonia (NH 3 ) emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment. Photocatalytic NH 3 oxidation to N 2 under mild conditions is a promising strategy. However, developing visible light photocatalysts for NH 3 oxidation is still in its infancy. Here, we fabricate N-TiO 2 and Ag/AgCl/N-TiO 2 photocatalysts by sol-gel and photodeposition methods, respectively. The introduction of N not only endows TiO 2 with visible light response (absorption edge at 460 nm) but also results in the formation of heterophase junction (anatase and rutile). Thus, N-TiO 2 shows 2.0 and 1.8 times higher than those over anatase TiO 2 and commercial TiO 2 for NH 3 oxidation under full spectrum irradiation. Meanwhile, surface modification of Ag can simultaneously enhance visible light absorption (generating localized surface plasmon resonance effect) and charge separation efficiency. Therefore, the photocatalytic activity of Ag/AgCl/N-TiO 2 is further improved. Furthermore, the presence of N and Ag also enhances the selectivity of N 2 product owing to the change of reaction pathway. This work simultaneously regulates photocatalytic conversion efficiency and product selectivity, providing some guidance for developing highly efficient photocatalysts for NH 3 elimination.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Jiayi Li,Ying Huang,Minhua Su,Yuying Xie,Diyun Chen
Heterocyclic aromatic compounds such as malachite green can cause immense harm to the environment and mankind because of their toxic bio-accumulation and insufficient biodegradation. ZnFe 2 O 4 /TiO 2 (ZF-T) has attracted attentions as a visible-light-driven catalyst because it can break and mineralize benzene through photolysis. Compared with TiO 2 , which photodegrades only 53.5% malachite green, anatase TiO 2 loaded with ZnFe 2 O 4 has greater photocatalytic activity and can degrade up to 90.1% malachite green. Furthermore, a photocatalytic efficiency above 80% can be obtained through five consecutive cycles with a duration of 4 h. In this study, ZF-T was characterized, and its photolytic parameters, including dosage, pH, time, and ionic strength, were optimized. The photolytic products of malachite green were analyzed by ultraviolet–visible spectroscopy and liquid chromatography-mass spectrometry, which confirmed that ZF-T can drive visible light to produce •O 2 − and H + free radicals that can efficiently degrade heterocyclic aromatic hydrocarbons and cleave benzene rings. These outcomes deepen our understanding of the development and applications of visible-light-driven ZF-T composites in the field of wastewater purification.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）