COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Xueying Zhao,Wenyu Xie,Zhibo Deng,Gan Wang,Aihui Cao,Huamei Chen,Bo Yang,Zhuan Wang,Xintai Su,Chao Yang
NiO-TiO 2-x /C composites for photo-catalytic hydrogen production have been prepared by a molten salt template-assisted pyrolysis of Ni/Ti-oleylamine precursors at different temperatures. X-ray diffraction (XRD) analysis shows that it is brookite structure, and X-ray photoelectron spectrum (XPS) determines the chemical state of the elements. Carbon nanosheets improve the dispersion and stability of TiO 2 , making the later fully close to each other. NiO facilitates the separation of photo-generated carriers and enhances the photocatalytic hydrogen production activity of TiO 2 . Due to the efficient synergy of carbon nanosheets, NiO, and TiO 2 , the optimized (1 wt%)NiO-TiO 2-x /C-T650 nanocomposites show enhanced activity toward photocatalytic hydrogen production from water, outperforming 18-fold in activity higher than pristine TiO 2 /C. Moreover, the (1 wt%)NiO-TiO 2-x /C-T650 catalyst exhibits good stability without obvious decrease in activity under continuous cycling. This work will lead to the optimization of carbon-supported multi-component catalysts for photocatalytic hydrogen production.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
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2024
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IF 2.4
Muhammad Jamshaid,Adeel Ahmed,Rashid Iqbal,Ali Fareed,Wedad A. Al-onazi,Mohamed S. Elshikh
The current study focuses on the development of highly efficient nickel oxide/titanium dioxide (NiO/TiO 2 ) p-n heterojunction catalysts constructed via sol–gel and ultrasonic techniques. Different techniques, including XRD, SEM, EDS mapping, and XPS, confirmed the successful synthesis of the photocatalysts. The BET analysis showed that the NiO/TiO 2 heterojunction has a surface area of 107.52 m 2 /g compared to pure NiO and TiO 2 (75.37 m 2 /g and 89.13 m 2 /g) respectively. The catalyst was then implemented to decompose the antibiotic tetracycline (TC) in water under visible light. The outcomes revealed that the degradation rate of TC reached 97.69 % using NiO/TiO 2 , which is substantially greater than the degradation achieved with pure NiO (52.43 %) and TiO 2 (71.11 %) within a 48-minute period pursuant to the most favorable circumstances. The initial rate constant of the NiO/TiO 2 (0.0756 min −1 ) was significantly higher compared to that of the NiO (0.0153 min −1 ) and TiO 2 (0.0261 min −1 ). The lower bandgap energy of the NiO/TiO 2 (3.19 eV) catalyst compared to the pure NiO (3.58 eV) and TiO 2 (3.29 eV) facilitated the abatement of TC due to the improved harvesting of visible light absorption. Furthermore, the study investigated the impact of several different reaction parameters and intervening anions on TC degradation. Radical trapping investigations substantiate the existence of reactive oxygen species. In addition, NiO/TiO 2 catalyst exhibited extraordinary stability and maintained its catalytic efficiency despite enduring five successive cycles. Overall, the NiO/TiO 2 catalyst demonstrated remarkable potential for abolishing TC-contaminated water.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Jiayu Feng,Ruoxu Liu,Xuejin Yang,Shuo Cui,Rui Cao,Ping Ning,Fang Wang,Zibin Pan,Lijuan Jia
Efficient removal of the highly toxic gas phosphine (PH 3 ) from various exhaust gases is a major challenge. To address this, we developed a cost-effective NiO/TiO 2 adsorbent (Ni X /TiO 2 ) via facile impregnation, achieving efficient anaerobic PH 3 removal at a low temperature (350 °C) with an exceptional breakthrough capacity of 232.23 mg(PH 3 ) g −1 . Characterization revealed that superior performance stems from abundant surface basic sites, developed porosity, and strong NiO-TiO 2 interfacial interactions promoting PH 3 adsorption and dissociation. During PH 3 capture, phosphorus incorporation transforms active NiO into Ni 2 P species, leading to adsorbent deactivation. Crucially, recognizing the photocatalytic potential of both TiO 2 and Ni 2 P, we repurposed the spent adsorbent as a Ni 2 P/TiO 2 heterojunction photocatalyst. Proof-of-concept experiments demonstrated its high efficacy in visible-light-driven wastewater treatment, achieving 91 % degradation of malachite green (MG). This work advances PH 3 purification technology while establishing a sustainable circular economy strategy via repurposing deactivated adsorbents into photocatalysts, aligning with resource conservation and recycling.
研究领域:
环境化学
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材料科学
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工业催化
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绿色化学
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
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2024
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IF 4.4
Chengyang Sun,Yong Guo,Xiaohui Liu,Yanqin Wang
Plastics with inter-monomer C–C bond linkages comprise more than 70% of all plastics production, but their chemical recycling and upcycling usually require harsh conditions due to the inertness of C–C bonds, hindering their utilization efficiency. Here, we develop an oxidative upcycling strategy to convert polystyrene (PS) waste into benzoic acid over a NiO/TiO2 catalyst. This system is carried out in an environmentally friendly manner in an aqueous phase by using air as the oxidant, and up to 51.1% carbon yield of benzoic acid is obtained at 200 °C, 1 MPa air and 18 h. The conversion of real-life PS plastics is also successfully demonstrated. The reaction mechanism is further investigated by capturing radicals and intermediates during the oxidative reaction, confirming ·O2− radicals as the reactive oxygen species. A possible oxidative mechanism was proposed: the ·O2− radicals first activated the C–H bonds in the aliphatic portion of PS to generate carbonyl groups or CC bonds; then, through attack of the weak CC bonds, the polymer was constantly depolymerized to smaller oxygenated oligomers, dimers and finally the target product, benzoic acid. This work has provided a promising and green polystyrene upcycling strategy.
研究领域:
化学工程
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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
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Zhenlong Song,Yuzhen Hu,Song Li,Jianguo Liu,Xinghua Zhang,Longlong Ma,Lungang Chen,Qi Zhang
Valorizing lignin into valuable chemicals requires the selective breaking of a large number of C–O bonds found in the β–O–4 structure. In this study, we present a one-pot strategy that utilizes two NiO/TiO2 catalysts for the photocatalytic depolymerization of β–O–4 alcohols. The S-1.6%NiO/TiO2 catalyst is used for the dehydrogenation of β–O–4 alcohols at 450 nm. Then, the L-0.8%NiO/TiO2 catalyst is employed for the hydrogenolysis of β–O–4 ketones at 365 nm. Remarkably, the dehydrogenation–hydrogenolysis tandem reaction can be conducted in one pot, which affords high yields of ketones and phenols (up to 89%) from β–O–4 alcohols. Additionally, the L-0.8%NiO/TiO2 catalyst prepared in this article is the smallest NiO/TiO2 photocatalyst reported to date, and the size of NiO in the S-1.6%NiO/TiO2 catalyst is even small enough to enter the lattice of TiO2. We successfully regulated the reaction selectivity by controlling the loading method and the amount of NiO. Our work offers a promising solution for efficiently cleaving target bonds in lignin and provides insights into the design of efficient photocatalysts.
研究领域:
化学工程
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材料科学
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可再生资源转化
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2015
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IF 1.998
Xinying Qi,Ge Su,Guoshuai Bo,Lixin Cao,Wei Liu
NiO and NiO/TiO 2 films were prepared on fluorine doped tin oxide (FTO) coated glass substrates by electrochemial deposition and sol–gel method. Choline chloride–urea ionic liquid was used as electrodeposition media. The composition, morphology and microstructure of the films were characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Cyclic voltammetry (CV), cycle life, response time and transmittance of the films were measured and compared with each other. Photocatalytic activity of the NiO/TiO 2 film was examined and explained through the degradation of methyl orange. Results show that, after 8000 cycles, both NiO and NiO/TiO 2 films still maintain their good electrochromic property and stability. The NiO/TiO 2 film not only performs excellent electrochromic function but also displays a certain photocatalytic activity. And interestingly, the NiO/TiO 2 film at bleached and colored states demonstrates different photocatalytic activities, which are higher than that at as-prepared state.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Meng-yuan Ding,Ming-ze Jia,Juan Wang
Green hydrogen production from methanol is a pivotal technology for energy transformation. In this work, the heterojunction structure of NiO–TiO 2 and incorporated Pd/Ir/Ru nanoparticles were successfully prepared through the utilization of sol-gel and in situ photodeposition methods. The highest yield of hydrogen from methanol is contributed by 0.5Pd–1Ni–TiO 2 showing 80.73 mmol g −1 H 2 for 4 h, which is 15.03 times higher than the H 2 yield obtained using TiO 2 . Furthermore, this work reveals that methanol adsorbs in two states: molecular CH 3 OH and dissociated CH 3 O∗, and the main adsorption modes of methanol on the surfaces of TiO 2 , 1Ni–TiO 2 and 0.5Pd–1Ni–TiO 2 exhibit similarities, with bridge adsorption being identified as the most favorable mode. The possible mechanism of the formation of main products was proposed. HCOOH is formed by oxidation of HCHO, or from desorption of formate. The two C–C coupling reactions of ·COOH + ·COOH and ·COOH + ·CH 3 produce CH 3 COOH.
研究领域:
材料科学
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催化化学
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能源转化
✓ 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）