Coatings
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2022
·Vol. 12
·期 3
·366
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IF 3.236
Shengping Zhang,Chen Yu,Jingyi Tan,Yuxin Wang,Zhen He
In this study, Ti/SnO2-Sb2Ox-TiO2electrodes were produced using a sol-enhanced electrodeposition technique from methanesulfonate electrolytes. The surface microstructures of Ti/SnO2-Sb2Ox-TiO2were observed, and their phase constituents were determined. The surface features were analyzed by X-ray photoelectron spectroscopy. Linear sweep voltammetry and degradation tests were also conducted to determine the degradation performance. The results show that the addition of TiO2sol affects the microstructures of Ti/SnO2-Sb2Ox-TiO2electrodes, while a uniform coating surface can be obtained at a proper sol concentration in electrolytes. Adding TiO2sol also causes deep oxidation of Sb and generates more adsorbed oxygen on the electrode surface. The favorable surface features and the well-dispersed TiO2in the coatings of 10 mL/L TiO2modified Ti/SnO2-Sb2Ox-TiO2electrodes award them the best electrocatalytic performance, and their uniform coating surface prolongs the electrode service life.Keywords:SnO2-Sb2Ox;sol-enhanced electrodeposition;organic degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jingsong Han,Yue Li,Liming Yang,Tingting Li,Yan Luo,Lixia Yang,Shenglian Luo
The suitable doping or modification on TiO 2 holds promise for improving charge separation and extending light absorption range. Here, WO 3 modifying reduced band gap mesoporous TiO 2 (WO 3 /RM-TiO 2 ) due to WO 3 doping was successfully fabricated by immersing mesoporous TiO 2 nanoparticles in the peroxotungstic acid sol with controllable reaction time (0–1 h). The W 6+ ions were first incorporated into the TiO 2 lattice to form W O Ti bonds, resulting in the formation of WO 3 doping TiO 2 . Then, WO 3 nanoparticles gradually formed and attached on the TiO 2 surface, constructing a novel heterojunction catalyst with WO 3 serving as both dopant and light-sensitizer for TiO 2 . Photocatalytic activity of the resulting WO 3 /RM-TiO 2 depends on the immersing duration in the peroxotungstic acid. The BET analysis shows that 0.5 h-WO 3 /RM-TiO 2 has the largest pore volume of 0.491 cm 3 g −1 and the highest surface area of 82.3 m 2 g −1 , whereas these values decline with prolonged immersing duration. As expected, the optimal efficiency in removing p-nitrophenol (PNP) is achieved over 0.5 h-WO 3 /RM-TiO 2 under visible light irradiation, which is 2.33 times that of the unmodified M-TiO 2 . This should be attributed to the suitable WO 3 doping and WO 3 modification.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED THERMAL ENGINEERING
·
2018
·
IF 3.771
Rong Chen,Ming Xia,Xun Zhu,Qiang Liao,Dingding Ye,Liang An,Youxu Yu,Long Jiao,Wei Zhang
A micro photocatalytic fuel cell with a visible-light responsive photoanode and the lateral arrangement of the electrodes at the same plane was developed to enable simultaneous organics degradation and electricity generation . The developed micro photocatalytic fuel cell was assessed by using methanol as a representative organic compound in the alkaline environment . It is shown that good visible-light response was achieved. The effects of the light intensity, methanol concentration , KOH concentration and liquid flow rate were also explored. Experimental results showed that when the light intensity was increased, the cell performance was improved due to more photo-excited electron-hole pairs. Upgrading the KOH concentration led to the increased performance due to more efficient capture of the holes and enhanced cathodic reaction and ion transport. The increase of the methanol concentration in the testing range led to the improved performance as a result of the enhanced mass transport. The discharging performance was firstly increased and then decreased with increasing the liquid flow rate due to the competition of enhanced mass transfer and decreased residence time and increased methanol crossover .
研究领域:
环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Lihan Pan,Wen Shi,Tapas Sen,Lingzhi Wang,Jinlong Zhang
The role of high-valent Fe has rarely been explored in persulfate-based heterogeneous reaction. Herein, the existence of Fe(IV) is verified in a visible light-assisted FeTiO 3 /persulfate system using methyl phenyl sulfoxide as the probe. The FeTiO 3 /persulfate/light system is capable of selectively degrading aromatic compounds with lower ionization potentials including tetracycline and bisphenol A by photo-generated high-valent Fe(IV). The contributions from SO 4 ·- , · OH and 1 O 2 are excluded. The comparable efficiency in the dark requires higher dosages and suffers from a rapid deactivation. Based on XPS, Raman and EPR analyses, the poor dark activity is caused by the formation of a complex between in situ formed Fe(III) and SO 4 2- on the FeTiO 3 surface; this complex is, however, the key intermediate for Fe(IV) production under the light irradiation. This study reveals the long-ignored role of SO 4 2- as an abundant species in iron-based persulfate systems. We also call for re-evaluating the real oxidation mechanism in other persulfate-based reactions considering the different oxidation mechanisms of radicals and high-valent iron.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 16
·3580-3590
·
IF 5.773
Xiufan Liu,Xuyang Xiong,Shuoping Ding,Qingqing Jiang,Juncheng Hu
In this work, we firstly synthesized metallic Bi-modified Bi4O5I2 nanocomposites with oxygen vacancies via a facile one-pot solvothermal method. The deposited Bi metal and oxygen vacancies endowed the Bi/Bi4O5I2 samples with dramatically enhanced photocatalytic performance for degradation of bisphenol A (BPA) and methyl orange (MO) under visible light irradiation. In particular, the improved photocatalytic activity can be ascribed to the synergistic effect of Bi metal and oxygen vacancies, which resulted in their efficient light harvesting properties and excellent charge separation ability. The photocatalytic mechanism of Bi/Bi4O5I2 for organics degradation was demonstrated. This work could shed light on exploring high photocatalytic performance materials and stimulating the development of non-noble metal/BixOyIz photocatalysts, which would also contribute to advancement in environmental remediation and energy exploitation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
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
Catalysts
·
2021
·Vol. 11
·期 11
·1414
·
IF 4.146
Yekun Ji,Ye Zhou,Jinnan Wang,Aimin Li,Weilin Bian,Philippe François-Xavier Corvini
A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic BiVO4{010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO4{010} and {110} facets. The visible-light response of m-BiVO4was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO4{010} facet to Au via a Schottky junction. Owing to higher work function, CoS was able to capture these photoelectrons with acceleration of the Co(Ⅱ)/Co(Ⅲ) redox, enhancing peroxymonosulfate conversion to sulfate radical (Co2++ HSO5−→ Co3++ •SO4−+ OH−). On the other hand, holes accumulated on m-BiVO4{110} facets also contributed to organics oxidation. Thus, more than 95% of RhB was degraded within 40 min, and, even after five cycles, over 80% of RhB could be removed. The radical trapping experiments and EPR confirmed that both the sulfate radical and photogenerated hole were the main species for organics degradation. UV-vis DRS, photoluminescence (PL) and photoelectrochemical analyses also confirmed the enhancement of the visible-light response and charge separation. In a pilot scale experiment (PMS = 3 mM, initial TOC = 151 mg/L, reaction time = 4 h), CoS-Au-BiVO4loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.
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
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Rong Wang,Yanyang Chu,Hongrui Zhang
Although alpha-ferric oxide (α-Fe 2 O 3 ) has been widely used in photocatalysis, Fenton-like and photo-Fenton systems for organics degradation, its catalytic activity is still necessary to be evaluated scrupulously in full consideration of organics adsorption and homogeneous Fenton oxidation. In this work, nanoscale α-Fe 2 O 3 was prepared by the direct calcination of FeCl 3 · 6 H 2 O, and its true catalytic activity in photocatalysis, Fenton-like and photo-Fenton systems was evaluated by the degradation of rhodamine B (RhB) and tetracycline (TC). It was found that the activity of α-Fe 2 O 3 in Fenton-like and photo-Fenton systems at pH 3.0 was higher than that at pH 7.0 and pH 9.0. Compared with photocatalysis and Fenton-like systems, photo-Fenton system exhibited greater organics degradation performance. In the photo-Fenton system, photocatalytic reactions can not only degrade organics directly and accelerate the redox cycle of Fe(II)/Fe(III), but also supply more active sites to promote H 2 O 2 activation. Photocatalytic reactions caused more Fe leached, whereas dissolved Fe could enhance degradation performance significantly even at a very low concentration (0.15 mg L –1 ). An interesting result was that the increase of solution pH enhanced H 2 O 2 decomposition in the photo-Fenton system, but the degradation performance decreased obviously. Overall, α-Fe 2 O 3 does not have high activity in photocatalysis and Fenton-like systems, and its heterogenous Fenton-like activity may be overestimated in many references. α-Fe 2 O 3 is more suitable to be applied in photo-Fenton system to remove organic pollutants from acidic wastewaters considering H 2 O 2 utilization efficiency.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sijing Yao,Jianqing Ma,Di Ma,Mika Erik Tapio Sillanpää,Minghua Zhou,Qing Ye,Huixia Jin,Kefeng Zhang
Chromium, as a widely utilized transition metal, presents wastewater with high toxicity and challenging treatment. To date, there has been limited exploration regarding the application of chromium in homogeneous Fenton-like reactions. This study aims to explore the potential of Cr(VI) and Cr(III) to activate hydrogen peroxide (H 2 O 2 ) and permonosulfate (PMS) for degrading coexisting pollutants in homogeneous solutions. The Cr(VI)/PMS system was found to be the most effective, with a 95.58 % removal efficiency for the azo dye Acid Red 73 (AR73). The Cr(VI)/H 2 O 2 system followed with 72.35 %, while the Cr(III)/H 2 O 2 and Cr(III)/PMS systems showed lower efficiencies at 25.65 % and 16.95 %, respectively. Various techniques were employed to delve into the mechanisms underlying chromium activation. The results indicate that both Cr(VI) and Cr(III) can activate H 2 O 2 to generate hydroxyl radical (HO • ). Moreover, Cr(VI) can activate PMS in the pH range of 3 ∼ 11, producing HO • , sulfate radical (SO 4 •- ), and singlet oxygen ( 1 O 2 ), while Cr(III) engages in chelation with PMS, causing the reaction to cease. Additionally, this study reveals that the chelating agent EDTA, upon complexing with Cr(III), efficiently activates PMS to generate 1 O 2 , and the mechanism behind EDTA-Cr(III) activation of PMS was elucidated through DFT calculations. An integrated evaluation of Cr performance in the Fenton-like reaction provides new research directions for the removal of pollutants from chromium-containing wastewater.
研究领域:
环境科学
·
化学工程
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Chengbo Ma,Yuexu Liu,Jun Wang,Nkuissi Tchikou Evrard Deric,Yang Li,Xiaobin Fan,Wenchao Peng
Designing iron-based catalysts for Fenton-like reactions with peroxymonosulfate (PMS) as oxidants have attracted growing attentions. Herein, pyrite FeS 2 supported on carbon spheres (FeS 2 @C) is synthesized by a facile low-temperature method. The FeS 2 @C/PMS system can degrade carbamazepine (CBZ) effectively in a wide pH range. Sulfate radicals (SO 4 ·- ), hydroxyl radicals (·OH), superoxide radical (O 2 ·- ), and singlet oxygen ( 1 O 2 ) are the responsible reactive oxygen species (ROSs) for CBZ degradation. Moreover, in the simulated fixed-bed reactor, the FeS 2 @C/PMS system can maintain a high CBZ removal ratio of >95% for than 8 h, exhibiting its excellent stability. The outstanding performance of FeS 2 @C/PMS system is attributed to the presence of carbon spheres and lattice S 2− , which together promote the Fe(III)/Fe(II) redox cycle. The FeS 2 @C is a promising catalyst due to its facile synthesis, low cost, high efficiency, and excellent stability to activate PMS for organics degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Z. Jin,X. Zheng,Z. Zhu,C. Hu,L. Liu,L. Fang,N. Luo,Z. Cheng
It is urgently necessary to develop efficient and environmentally friendly catalysts to solve pollution problems faced by humankind. In this work, ferroelectric Ba 2-x Sr 3+x LaNb 7 Ti 3 O 30 (x = 0, 0.2, 0.4, 0.6) (BSLNT) tungsten bronze ceramics were prepared using a high-temperature solid-phase method and applied as tribocatalysts for degradation of organics. The built-in electric field in ferroelectric BSLNT was enhanced by modulating the ferroelectric polarization and by electrical poling. The degradation results show that better ferroelectric properties of the tribocatalysts led to better the catalytic capability with 92% RhB degradation after 2 h. The further enhanced polarization of the catalyst by electrical poling can improve the degradation efficiency of RhB to 96.8% in 2 h. Under the synergistic effect of illumination and friction, the degradation efficiency of RhB after 30 min reached 95.2%. Therefore, a highly efficient ferroelectric tribocatalyst with an enhanced built-in electric field for degradation of dye wastewater was demonstrated, expanding the application of ferroelectric materials in the catalysis field.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Ahmad Beyhaqi,Seyed Mohammad Taghi Azimi,Zhihong Chen,Chun Hu,Qingyi Zeng
Exfoliated and plicated g-C 3 N 4 nanosheets (CNsF) were prepared through a thermal-chemical exfoliation in which the bulk g-C 3 N 4 was obtained first under thermal exfoliation, and then was exposed to an acidic etching using hydrofluoric acid under hydrothermal condition. The acidic etching not only exfoliated g-C 3 N 4 nanosheets by disrupting weak van der Waals forces between layers, which led to formation of a monolayer or a few layers of g-C 3 N 4 nanosheets, but also made disordered defects on its surface and created plicated g-C 3 N 4 nanosheets. Under visible-light illumination, the optimized sample (CNsF-6%) showed a hydrogen evolution rate of 54.13 μmol h −1 g −1 (without co-catalyst) and a specific surface area of 121.4 m 2 g −1 , which were about 4.7 and 2.5 times, respectively, higher than pristine g-C 3 N 4 . It also showed remarkably enhanced photocatalytic performance in removing various organic pollutants. This remarkable improvement probably arises from the porous nanosheets and an increased number of active sites resulting from the CNsF, which subsequently enhanced the charge separation efficiency. This work provided an alternative way to obtain highly active g-C 3 N 4 photocatalysts .
研究领域:
材料科学
·
环境科学
·
化学
✓ 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）