APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 2
·e4049
·
IF 2.319
Xiaowen Tong,Zhiquan Yang,Jinna Feng,Ying Li,Hongguo Zhang
Semiconductor-based photocatalysis is an environmental friendly and cost-effective technique for water treatment. Due to their unique properties, metal–organic frameworks (MOFs) are considered as ideal platform to develop composite photocatalyst. In this study, Bismuth oxychloride (BiOCl) was first attempt to be incorporated with highly stable MOFs, UiO-66(Zr) by hydrothermal reaction. Different characterization methods including X-ray diffraction, Scanning electron microscopy, Fourier transform infrared spectroscope, X-ray photoelectron spectroscopy had been used to prove the successful synthesis of composite photocatalyst. The resultant BiOCl/UiO-66 composite showed higher photodegradation performance of Rhodamine B (RhB) under ultraviolet and visible light irradiation than that of pristine materials and their mechanically mixed sample. In addition, the composite exhibited good structural stability and reusability. The photocatalytic mechanism of RhB degradation over the composite under visible light proceeded via a photosensitization process. A better adsorptivity of RhB and effective electron transfer within the hybrid material might be responsible for the enhanced photocatalytic performance.
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
WATER RESEARCH
·
2021
·
IF 11.236
Zhang Yan,Zongren Dai,Wenxiao Zheng,Zhenchao Lei,Jinwen Qiu,Wenjie Kuang,Weijun Huang,Chunhua Feng
ABSTRACT The treatment of low-concentration ammonium (e.g., <50 mg L −1 ) in highly acidic wastewaters through traditional biological nitrification, physical separation, or chemical stripping remains a huge challenge. Herein, we report that photocatalytic ammonium oxidation using bismuth oxychloride (BiOCl) can successfully occur in Cl − -laden solutions within a pH range of 1.0-6.0. All reactions follow pseudo-zero-order kinetics (with rate constants of 0.27-0.32 mg L −1 min −1 at pH 2.0-6.0 and 0.14 mg L −1 min −1 at pH 1.0), indicating the saturation of reactive species by the reactants. The interlayer is self-oxidized by the valence band holes (VB h + ), resulting in the formation of Cl • and subsequently HClO, which is excited upon UV irradiation to provoke consecutive photoreactions for chlorine radical generation. Compared to the free chlorine, HO • , Cl • , and Cl 2 • − , the ClO • produced using the UV/BiOCl system plays a predominant role in oxidizing ammonium under acidic conditions. BiOCl exhibits good stability because of the compensation of Cl − from solution and maintains high activity under different conditions (i.e., different cations and co-existing anions, temperatures, and initial substrate concentrations). The successful removal of ammonium from real wastewater using the UV/BiOCl system suggests that this is a promising method for treating diluted ammonium under highly acidic conditions.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chundong Liu,Yulong Xiang,Xiaoli Dong,Yu Wang,Jialin Niu,Nan Zheng
Photocatalytic nitrogen (N 2 ) reduction reaction for solar energy conversion encounters considerable challenges due to the inadequate performance of semiconductor photocatalysts. The role of metal cation vacancies in photocatalytic nitrogen fixation is rarely explored. Here, we report a facile strategy to construct BiOCl nanosheets with tunable Bi-vacancy via tungsten doping. W-doped energy levels and Bi vacancies (V Bi ) can effectively tune the energy band structure of BiOCl, thereby broadening the range of light absorption and enhancing carrier transport. Density functional theory (DFT) calculation results reveal that the doped W 6+ can act as the main activation sites of nitrogen for N≡N elongation, and the Bi vacancies are the main adsorption sites with the strongest nitrogen adsorption energy. This results in the formation of dual active sites for nitrogen adsorption and activation. W-BiOCl-2 showed excellent nitrogen fixation efficiency of 1016.6 μmol h −1 g −1 , which was 2.6 times higher than that of pristine BiOCl without any sacrificial agents. This study provides a promising strategy for the design of high-performance photocatalytic N 2 fixation catalysts with multiple active sites.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 5
·1515-1519
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IF 2.61
Meichao Gao,Dafeng Zhang,Xipeng Pu,Mingtong Li,Young Moon Yu,Jae Jeong Shim,Peiqing Cai,Sun Il Kim,Hyo Jin Seo
Bismuth oxychloride (BiOCl) was synthesized by a simple combustion method. The structures, morphologies, absorbance, optical, and photocatalytic properties of the samples were studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectrophotometry, and photoluminescence. The experimental results show that BiOCl microsheet with high percentage of exposed {001} facets was obtained. It is interesting to note that the thickness of BiOCl sheets, in other words, the percentage of exposed {001} facets can be modulated through changing the added amount of ammonium chloride. The sample with the thinnest BiOCl sheets shows the best photodegradation performance of Rhodamine B under ultraviolet light irradiation, which can be attributed to the cooperative effect between the high percentage of exposed {001} facets and high-specific surface area. Moreover, the corresponding influencing mechanism on the percentage of exposed {001} facets of BiOCl was discussed.
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
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zaichun Sun,Shaoyong Qin,Daichi Oka,Huijuan Zhang,Tomoteru Fukumura,Yuji Matsumoto,Bingchu Mei
Semitransparent and homogeneous bismuth oxychloride (BiOCl) thin films with (001) preferred orientation were synthesized on polycrystalline Sn:In2O3-glass substrates by mist chemical vapor deposition. The films showed photocathodic activity even under near-ultraviolet light within the band gap due to the in-gap states induced by oxygen vacancies. Higher synthesis temperatures resulted in a significant increase of photocurrent density under ultraviolet light. While the longer lifetime of photocarriers led to an increase of internal quantum efficiency, the larger band-edge absorption significantly contributed to the higher external quantum efficiency.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 7
·4729-4745
·
IF 3.9
Kunyu Chen,Yiwei Huang,Meina Huang,Yanqiu Zhu,Ming Tang,Renjie Bi,Meiping Zhu
Photocatalytic oxidation (PCO) based on semiconductors offers a sustainable and promising way for environmental remediation. However, the photocatalytic performance currently suffers from weak light-harvesting ability, rapid charge combination and a lack of accessible reactive sites. Ultrathin two-dimensional (2D) materials are ideal candidates to overcome these problems and become hotpots in the research fields. Herein, we demonstrate an ultrathin (<4 nm thick) Na-doped BiOCl nanosheets with {001} facets (Na-BOC-001) fabricated via a facile bottom-up approach. Because of the synergistic effect of highly exposed active facets and optimal Na doping on the electronic and crystal structure, the Na-BOC-001 showed an upshifted conduction band (CB) with stronger reduction potential for O2 activation, more defective surface for enhanced O2 adsorption, as well as the highest visible-light driven charge separation and transfer ability. Compared with the bulk counterparts (BOC-010 and BOC-001), the largest amount of active species and the best photocatalytic performance for the tetracycline hydrochloride (TC) degradation were achieved for the Na-BOC-001 under visible-light irradiation, even though it had slightly weaker visible-light absorption ability. Moreover, the effect of the Na doping and crystal facet on the possible pathways for TC degradation was investigated. This work offers a feasible and economic strategy for the construction of highly efficient ultrathin 2D materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wangwang Ji,Junjian Niu,Wei Zhang,Xuan Li,Wenjun Yan,Xiaogang Hao,Zhongde Wang
The development of selective separation materials with large capacity and high selectivity has always been a research hotspot in the field of water remediation. In this study, an electroactive ion exchange hybrid film of bismuth oxychloride/chloride ion-imprinted polypyrrole (BiOCl/PPy-Cl) with core–shell nanosheet structure was successfully fabricated by a chemical oxidation method for selective extraction of chloride ions. Herein, the BiOCl/PPy-Cl hybrid film possessed superior conductivity due to the incorporation of the conductive polymer. Furthermore, the hybrid film could more quickly and effectively extract Cl - compared with BiOCl and PPy-Cl, and its uptake capacity reached as high as 80.81 mg⋅g −1 at the optimal potential of 0.6 V. Meanwhile, based on the screening effect brought by the outer PPy-Cl shell, the hybrid film displayed prominent selectivity toward Cl - even in the presence of other competing species. In addition, the hybrid film maintained steady adsorption capacity in 10 cycles as well as under different acid-base environments. The outstanding Cl - uptake performance of the hybrid film was primarily ascribed to the open interlayer structure of BiOCl and the collaboratively-driven force generated by the reversible electrochemical redox of BiOCl and PPy. It is expected that the obtained BiOCl/PPy-Cl hybrid film could be a promising alternative for the extraction of Cl - from wastewater.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yang Zhang,Baihe Sun,Lin Jiang,Jiahui Fan,Fangjie Qin,Zhuo Liu,Jue Wang,Kan Kan,Keying Shi
A facile polymer heat treatment and reflux method are used for developing growth of flower-like BiOCl (BiOCl NFs) on 3D honeycomb-like N-doped graphitic carbon (N-GC) to form BiOCl/N-GC composites. The N-GC hierarchical structure effectively heightened the dispersion of BiOCl NFs, which increased the contacted area for the NO x gas molecule. Benefiting from the hierarchical structure, the (102) plane of BiOCl has a suitable adsorption energy for NO x , synergistic effect of large specific surface area and mesopores of N-GC, the formation of p-p heterojunctions , Bi–C interfacial bond, N-doping and the role of chemisorbed oxygen. The BiOCl/N-GC composites have satisfactory response and selectivity for NO x gas at room temperature. It reveals an exceptionally excellent response and response time of 52.54 and 3.2 s for NO x gas. It also exhibits a low detection limit (10 ppb) and a long-stability of 12 weeks. Thus, the BiOCl/N-GC nanocomposites are one of the most potential materials in gas sensor.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wei Li,Zhilin Liu,Yangbo Dong,Luoqi Wang,Zhi Liu,Ling Zhang,Zhen-An Qiao
The spontaneous recombination of photogenerated carriers greatly limits the improvement of photocatalytic efficiency for bismuth oxychloride-based catalysts. Constructing porous or heterostructure photocatalysts can effectively inhibit their recombination. However, owing to the fast hydrolysis/condensation rates and uncontrollable nucleation/growth kinetics of Bi 3+ species, it is difficult to achieve inorganic–organic co-assembly, and form mesoscopic structure and heterostructure. Herein, a series of mesoporous bismuth oxychloride-based materials (Bi 2 O 3 at a stoichiometric ratio of 0 for Cl, Bi 12 O 17 Cl 2 , heterostructured Bi 12 O 17 Cl 2 /BiOCl and BiOCl) with various stoichiometry, tunable compositions and large surface areas are synthesized by a micellar interface modulation self-assembly strategy. In this strategy, Pluronic P123 and cetyltrimethyl ammonium chloride (CTAC) form P123/CTA + composite micelles, which assemble with Bi 3+ precursors by Coulomb interactions. Moreover, the Cl - ions are induced and modulated through composite micelles to involve in the slow hydrolysis and condensation of Bi 3+ precursors at the hydrophilic-hydrophobic interface of composite micelles to form mesophase, thereby realizing the synthesis of mesoporous bismuth oxychloride with various stoichiometry and compositions by regulating CTAC amount. The prepared mesoporous Bi 12 O 17 Cl 2 /BiOCl-O V shows superior photocatalytic activity (degrade 83% within 30 min for 10 mg/L carbamazepine and 99% within 10 min for 10 mg/L ciprofloxacin), which can be ascribed to the mesoporous architecture, intimate contact heterojunction and abundant surface oxygen vacancies. This work provides a new idea and strategy for design and synthesis of high-efficiency mesoporous bismuth oxychloride-based photocatalysts.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaofen Xu,Lingfang Tang,Yuanyi Zhou,Gang Lu,Haojie Dong,Mingshan Zhu
Utilizing the immanent salt (Cl – ) in wastewater to generate reactive chlorine species (RCS) satisfies the future needs for sustainable, on-demand, and decentralized ammonia nitrogen (NH 4 + -N) removal. The microstructural evolution of bismuth oxychloride (BiOCl) photocatalyst under irradiation benefits for overcoming the competition between Cl – and H 2 O oxidation and achieving high N 2 selectivity. Herein, internal electric field (IEF) engineering by carbon doping is applied to promote photocatalytic RCS generation rate over BiOCl. The carbon dopant not only enhances the IEF intensity of BiOCl by a factor of 2.1 times for carrier dynamics promotion, but also improves Cl – oxidation against H 2 O oxidation. An RCS production rate of 0.23 mg/L min −1 is realized over carbon-doped BiOCl (C-BiOCl) through the accelerated interaction between lattice and environmental Cl – , which is twice that of the undoped BiOCl (0.11 mg/L min −1 ). The relation between IEF intensity and RCS generation rate over C-BiOCl manifests a correlation coefficient of 0.96. Effective NH 4 + -N degradation with N 2 selectivity of >99% is validated. The system is competent in dealing with saline NH 4 + -N wastewater with a wide range of NH 4 + -N (20∼200 mg N/L) and NaCl (6∼10 g/L) concentrations. In the treatment of realistic landfill leachate (884 mg N/L NH 4 + -N), C-BiOCl displays a photocatalytic NH 4 + -N removal efficiency of up to 95.6% while maintaining the NO 2 − -N (∼2 mg N/L) and NO 3 − -N (∼40 mg N/L) levels. This system provided an interesting and innovative idea for wastewater self-purification.
研究领域:
环境科学
·
废水处理
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DOI
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 10
·2656-2663
·
IF 2.153
Shi Huili,Zhao Wenjing,Zhao Xiaowei,Li Zhiwei,Li Xiaohong,Zhang Zhijun
A novel green composite flame retardant, bismuth oxychloride nanosheet decorated with chitosan and phytic acid (BiOCl@CS-PA) was prepared in order to improve the fire safety of flexible poly(vinyl chloride) (PVC). Introducing phytic acid (PA) is aimed at promoting the flame retardancy of BiOCl nanosheets in condensed phase using the synergistic effects. Chitosan (CS) not only acts as a bridge between BiOCl and PA, but also increases residue as a charring agent. Adequate characterizations verified that the BiOCl@CS-PA has been prepared successfully. When 3 wt.% of BiOCl@CS-PA was imparted into the PVC matrix, the resultant PVC composite can pass V-0 rating in the UL-94 test. Additionally, cone calorimetry test demonstrated that 3 wt.% of BiOCl@CS-PA reduced the first peak heat release rate and inhibited the pronounced peak heat release rate of PVC matrix between 300–400 s in comparison with the BiOCl nanosheets, indicating a further improvement in flame retardancy of PVC/BiOCl@CS-PA composite with the help of PA in the condensed phase. Microstructure and morphology of the char residue of PVC/BiOCl@CS-PA were analyzed to reveal the flame retardant mechanism. The results indicated that the joint action of PA and CS improves the quality of the char layer, which contributes to improving the flame retardancy in condensed-phase.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
RSC Advances
·
2011
·Vol. 1
·期 8
·1542-1553
·
IF 0
Jinyan Xiong,Gang Cheng,Guangfang Li,Fan Qin,Rong Chen
Well-crystallized square-like bismuth oxychloride (BiOCl) nanoplates were successfully synthesized by a facile and environmentally friendly hydrothermal process in mannitol solution. The product was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), Raman spectroscopy, UV–vis diffuse reflection spectroscopy (DRS) and nitrogen adsorption. It was found that mannitol played a key role in the formation of square-like BiOCl nanoplates and the possible growth mechanism was also discussed. The photocatalytic activity of prepared BiOCl nanoplates was determined by the degradation of Rhodamine B (RhB) under visible light irradiation. The square-like BiOCl nanoplates exhibited excellent visible-light-driven photocatalytic efficiency, which was much higher than that of commercial BiOCl and TiO2 (anatase). The remarkable visible-light photocatalytic activity was mainly attributed to the synergistic effect of the layered structure and the strong adsorption of RhB dye upon the BiOCl nanoplates, which might allow more efficient transport of the injected electrons. A possible dye-sensitized photocatalytic degradation process (photosensitization pathway) was proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）