Desalination and Water Treatment
·
2024
·
IF 1
Jianli Wang,Biyang Tuo,Xiulong Shi,Jinwang Tian
A series of BiOCl/TiO 2 /montmorillonite photocatalytic material (BTM) were prepared by sol-gel method combined with calcination process, and were used for the degradation of Congo red. The phase composition, morphology, and optical properties of the as-prepared materials were characterized by XRD, SEM, BET and UV–vis DRS. Compared with BiOCl and TiO 2 , BTM has a better removal effect on Congo red, in which BTM-20 has the highest photocatalytic activity. After 120 min of illumination, the degradation rate of Congo red by BTM-20 reached 94.04 %. The photocatalytic degradation process of Congo red by BTM-20 conformed to the pseudo-first-order kinetic model with a reaction constant of 0.00803 min −1 . The type-Ⅱ heterojunction between BiOCl and TiO 2 promotes the separation of photogenerated electron-hole pairs of BTM-20 and enhances the absorption for visible light. The experiment of the free radical capture indicated that superoxide radical played a leading role in photocatalytic degradation of Congo red, followed by hydroxyl radical. This study provides a new treatment ideas for environmental remediation, and provides an efficient photocatalytic material for the degradation of pollutant.
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
Analytical Methods
·
2018
·Vol. 11
·期 3
·375-380
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IF 2.073
Yanni Luo,Yan Mi,Xuecai Tan,Quanyou Chen,Defen Feng,Chenhao Ai
A convenient photoelectrochemical sensor was constructed based on the synergistic contributions of an ultrathin BiOCl nanosheet and anchored TiO2 nanoparticles to detect the organophosphorus pesticide chlorpyrifos. As expected, the fabricated heterostructure showed a distinct improvement in photocurrent intensity compared with pristine BiOCl and TiO2. This remarkable enhancement may be attributed to the separation and transfer of photogenerated charge carries, which benefit from intimate interfacial interactions between the ultrathin BiOCl nanosheets and TiO2 nanoparticles. Based on the robust photocurrent signal, a novel PEC sensor was established for the sensitive and selective detection of chlorpyrifos. The as-fabricated PEC sensor demonstrates many advantages such as a wide linear range of 1–12 μM, a low detection limit of 0.11 μM, S/N = 3, and remarkable convenience, which provides a general format for chlorpyrifos detection in green vegetable analysis.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
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IF 4.233
Benxia Li,Liangzhi Shao,Baoshan Zhang,Renshan Wang,Mei Zhu,Xiaowei Gu
Investigating the dependence of the catalysis on the size and structure of materials is of great significance for exploiting catalysts with characteristics of high activity, low cost, and new property. Non-precious metal catalysts bear high hope to meet the increasing demands of industrial applications in a cost-effective and environmentally friendly way. In this work, we take size-controlled BiOCl nanosheets as examples, which are synthesized via a hydrothermal method by changing the reaction conditions. The BiOCl nanosheets were characterized in details to understand their size–property relationships, and were found to exhibit a series of thickness-dependent physicochemical properties, including specific surface area, light absorption , and the separation efficiency of photo-generated charge carriers. Moreover, this work demonstrates the first example that BiOCl nanostructures have very high catalytic activity for the reduction of nitrophenols by sodium borohydride , without any light irradiation . The high catalytic activity of BiOCl nanosheets was proved to be due to the metallic Bi 0 clusters that were produced by surface Bi (III) reduction. The catalytic activity increased greatly with a decrease in the average thickness from 106.42 nm of BiOCl(H 2 O) to 3.47 nm of ultrathin BiOCl, because the increased specific surface area provided more active sites for catalytic reactions . As a result, this work provides evidences for the size–property relationships of nanostructured catalysts as well as some inspirations for exploiting novel heterogeneous catalysis of BiOCl nanomaterials.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 19
·6949
·
IF 4.6
Heng Guo,Yangzhou Deng,Haoyong Yin,Juanjuan Liu,Shihui Zou
Fabricating heterostructures with abundant interfaces and delicate nanoarchitectures is an attractive approach for optimizing photocatalysts. Herein, we report the facile synthesis of BiOCl nanoflake/FeOCl nanospindle heterostructures through a solution chemistry method at room temperature. Characterizations, including XRD, SEM, TEM, EDS, and XPS, were employed to investigate the synthesized materials. The results demonstrate that the in situ reaction between the Bi precursors and the surface Cl−of FeOCl enabled the bounded nucleation and growth of BiOCl on the surface of FeOCl nanospindles. Stable interfacial structures were established between BiOCl nanoflakes and FeOCl nanospindles using Cl−as the bridge. Regulating the Bi-to-Fe ratios allowed for the optimization of the BiOCl/FeOCl interface, thereby facilitating the separation of photogenerated carriers and accelerating the photocatalytic degradation of RhB. The BiOCl/FeOCl heterostructures with an optimal composition of 15% BiOCl exhibited ~90 times higher visible-light photocatalytic activity than FeOCl. Based on an analysis of the band structures and reactive oxygen species, we propose an S-scheme mechanism to elucidate the significantly enhanced photocatalytic performance observed in the BiOCl/FeOCl heterostructures.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yiqiu Shi,Xuyang Xiong,Shuoping Ding,Xiufan Liu,Qingqing Jiang,Juncheng Hu
We herein demonstrate the uniform porous hierarchical plate-like BiOCl/2D networks Bi 2 S 3 heterostructures realized by a facile two-step hydrothermal technique. The synthesis involved an anion exchange process by reacting pre-synthesized BiOCl irregular octagonal nanoplates with Na 2 S 2 O 3 ·5H 2 O in an aqueous solution. The experiment results revealed that the 3D plate-like heterostructures were composed of internal BiOCl and outside networks interwoven by 1D Bi 2 S 3 nanorods . Interestingly, the heterostructures had almost the same thickness and the bigger length compared to the precursor BiOCl. We proposed the possible formation mechanism of the composites which involved selective ion-exchange reaction, the following Ostwald ripening process and epitaxial growth . And the crystal lattice matching between the a- or b-axis of tetragonal BiOCl (a = b = 3.89 Å) and the a-axis of orthorhombic Bi 2 S 3 (a = 3.981 Å) could be responsible for the in-situ topotactic transformation. Due to the formation of hetero-nanostructures, the unique spatial architecture features and the existence of oxygen vacancies, the BiOCl/Bi 2 S 3 composites exhibited significantly extended photo-responsive range and improved photocatalytic activity for reduction of Cr VI under visible-light irradiation. Moreover, the possible mechanism of photocatalysis process was investigated. Our work is expected to inspire further attempts for hierarchical and unconventional hetero-nanostructures with unique spatial architecture, which is very promising for photocatalysis and other applications.
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
NANO
·
2015
·
IF 1.09
Hongbin Chen,Wangmiao Fu,Xiang Yu,Yi Zhu,Hui Meng,Jinpeng Tang,Yuanming Zhang
A facile one-step method was developed for the first time to fabricate BiOCl film on Cu substrate by simply dipping the Cu substrate in the mixed solution containing HCl, glycol, H 2 O 2 and BiCl 3 . This method shows the advantages of a simple technique, uniform and controllable morphology, as well as easy mass production. The absorption capacity of BiOCl film was investigated by adsorption of Rhodamine B and Congo red (CR) and their maximum adsorption capacities were 1667 mg g − 1 and 1429 mg g − 1 , respectively. The negative values of free energy and the positive values of enthalpy suggested that the adsorption were spontaneous and endothermic, respectively. Moreover, both adsorptions were matched with the pseudo-second-order equation. This film could be reused and the recycle rates for Rhodamine B and CR were still about 95% and 75% after five cycles, respectively. The adsorption mechanism revealed that hydrogen bond mainly accounted for the adsorption of dyes.
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
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 29
·10992-11004
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IF 4.569
Feihu Zhang,Xinyan Xiao,Yu Xiao
A novel type II BiOCl/CAU-17 2D/2D heterostructure photocatalyst was synthesized by in situ growth of ultrathin BiOCl on the surface of CAU-17 nanorods through a solvothermal process. The 2D/2D heterostructures endow the BiOCl/CAU-17 heterojunction with a large specific surface area and tight interfacial contact, which can provide sufficient channels for carrier migration. The introduction of CAU-17 can enhance the light absorption ability of BiOCl/CAU-17 photocatalysts. Furthermore, the staggered type II heterostructure energy band alignment formed between BiOCl and CAU-17 can promote the separation of photoexcited carriers. The improved performance for carrier migration and light absorption was evaluated by SEM, TEM, BET, EIS, and DRS tests. Transient photocurrent response and photoluminescence tests confirmed the improvement in separating photoexcited carriers. The optimal 70% BiOCl/CAU-17 sample exhibited the highest photocatalytic degradation efficiency of 96.3% for RhB and 85.5% for TC, under 90 min of simulated solar light irradiation. Its apparent first-order rate constant k values are 0.02947 and 0.01955 min−1, respectively, being 48.31 and 19.75 fold higher than those of CAU-17, and 7.61 and 1.84 fold higher than those of BiOCl. The free radical scavenging experiment results showed that h+ and ˙O2− are the prime active species during the photodegradation process. Hence, a possible photocatalytic mechanism of the type II BiOCl/CAU-17 heterojunction was proposed.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2016
·Vol. 1
·期 5
·859-866
·
IF 0
Guangdi Nie,Xiaofeng Lu,Wei Wang,Maoqiang Chi,Yanzhou Jiang,Ce Wang
A simple and green strategy was proposed for the first time to fabricate uniform polyaniline (PANi) thorn/BiOCl chip (BPB) heterostructures at a low temperature without the assistance of any surfactant. During the synthetic process, Bi2S3 nanowires acted as both the sacrificial template and the Bi source for BiOCl, affording the synchronous formation of HCl-doped PANi conductive arrays and BiOCl chips supported on residual Bi2S3 nanowires. As expected, when utilized as electrode materials for supercapacitors, the obtained BPB nanocomposite exhibited a better electrochemical performance in neutral media with enhanced specific capacitance, a more acceptable rate capability and a smaller charge-transfer resistance in comparison with the individual PANi nanofibers due to the unique hierarchical nanostructure of BPB and the synergistic effect between the ionizable BiOCl and the PANi chain.
研究领域:
材料科学
·
电化学
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DOI
Journal of Water Process Engineering
·
2021
·
IF 5.485
Qian Zhao,Liang Hao,Fei Li,Tongyang Liu,Yiqiang He,Jun Yang,Yifan Zhang,Yun Lu
The hydrothermal method was used to prepare flexible BiOCl-BiOI films on one stainless steel wire mesh. Nano-flower like BiOCl-BiOI crystals consisted of nanoplates were formed, and BiOCl was uniformly distributed. The XPS (X-ray photoelectron spectroscopy) spectra confirm the formation of BiOCl-BiOI heterojunction, which enhanced the visible light absorption of the BiOI film. The photocatalytic activity of the BiOCl-BiOI film in degrading RhB and MB was elevated by at most 8.7 and 2.4 times, respectively, comparing with the individual BiOI film. We designed and constructed a piezo/photocatalytic platform in which the prepared BiOCl-BiOI films were fixed on a rotating shaft. Compared with the static state, the photocatalytic activity of the BiOCl-BiOI film was increased by 1.4 times when the shaft was rotating. We believe that the enhancement of the photocatalytic activity should be ascribed to the piezoelectric field by introducing bending deformation, which accelerated the separation of photogenerated electrons and holes. The improvement mechanism of the photocatalytic and piezo/photocatalytic performance was proposed and discussed. The flexible BiOCl-BiOI heterojunction films show significant application potential in the pollution control of fluid fields such as rivers, oceans, waterfalls, and air.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Tingting Xu,Meiying Yang,Chuncheng Chen,Ran Duan,Qi Shen,Chunyan Sun
As typical persistent organic pollutants, polybrominated diphenyl ethers (PBDEs) have aroused high environmental concern due to their toxicity and recalcitrant degradation. Herein, the photocatalytic decabromodiphenyl ether (BDE209) removal performance was evaluated firstly on facet-dependent BiOCl with oxygen vacancies under irradiation (>360 nm). The results revealed that BDE209 was rapidly debrominated on {0 0 1} BiOCl with a reaction rate 4.4 times greater than that on {0 1 0} BiOCl under oxygen-free environment. Such a degradation order is completely opposite to that of Rhodamine B (RhB) degradation. This enhanced reduction is mainly attributed to the abundant oxygen vacancies on {0 0 1} facet of BiOCl, which act as adsorption sites for BDE209 to achieve C-Br bond activation efficiently. Meanwhile, debrominated products via meta- position have the highest proportion than that via ortho- and para- position in the first step. Therefore, a position-selective multi-electrons reduction mechanism is hypothesized. This study provides a new sight on C-X bond activation of halogenated aromatics by inducing oxygen vacancies on specific facets.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Qian Fu,Chenxi Wang,Jia Chen,Yilin Wang,Chunyan Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
Dopamine is an important neurotransmitter that has a crucial impact on the physiological health of the human body. Consequently, it is necessary to establish a highly selective and sensitive method for the determination of dopamine levels in serum. In this work, g-C 3 N 4 and BiPO 4 /BiOCl (BPCl) were used as optoelectronic materials to construct a novel dopamine photoelectrochemical sensor. Moreover, the optoelectronic materials were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy and steady-state fluorescence spectroscopy . Meanwhile, the photoelectrochemical performance of the modified electrodes with different materials was investigated, and the results showed that BPCl/C 3 N 4 /GCE has excellent photoelectrochemical performance. Concomitantly, the dopamine photoelectrochemical sensor also has a wide detection range (0.05–10 μM) and limit of detection (LOD = 0.023 μM). Furthermore, it has good reproducibility, selectivity and stability, which can be used in the actual sample detection of serum.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Hao Sun,Zhigang Xie,Jun Yang,Taiping Xie,Zixuan Zhang,Bingzhao Cui,Yanling Zhao,Meiying Huang
Bismuth chloride oxide is a potential photocatalyst with a unique structure and visible light responsive properties. This paper explores the effects of different ratios of NiO on the photocatalytic performance of NiO/BiOCl heterojunction photocatalysts, which are prepared by impregnation and annealing. The experimental results demonstrate that the construction of NiO/BiOCl heterojunction enhances the visible light response and significantly decreases the compounding efficiency of the photogenerated carriers. The degradation of tetracycline by 6% NiO/BiOCl was almost complete within approximately 30 min, which is about 30% faster than that of unmodified BiOCl. The cycling performance is excellent and the preparation process is simple, making it highly applicable.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）