SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qi Wang,Ningyi Li,Meng Tan,Man Deng,Guoxiang Yang,Qiang Li,Hao Du
Photocatalysis is an emerging technique for the remediation of refractory organic contaminants. Herein, a novel dual Z-scheme Bi/BiOI-Bi 2 O 3 -C 3 N 4 heterojunctions were constructed through a calcining process following with I − etching and UV-reduction processes. Various analytical technologies were adopted to characterize the materials. As a result, the Bi 0 decorated composite presented improved visible-light-response and rapid charge transfer. Due to the synergy of Bi 0 and dual Z-scheme heterostructures, a remarkable photocatalytic performance toward phenol degradation was achieved with the highest degradation efficiency of 93.2% and rate constant of 0.0161 min −1 over the optimal composite within 75 min of visible light irradiation. Interestingly, the concentration of the yielded benzoquinone considerably decreased with the introduction of C 3 N 4 . Trapping experiments and electron spin resonance (ESR) tests indicated that h + , O 2 − , OH and e − contributed to phenol remediation, and h + and O 2 − were the crucial species toward phenol degradation. Furthermore, outstanding stability was obtained only with a decline of 3.8% after 4 cycles. A reasonable charge transfer mechanism was also proposed. This work provides a new route for in situ construction of Bi 0 decorated dual Z-scheme heterojunction for phenolic compounds degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Shuoqi Zhang,Mingxing Zhao,Lei Shi,Chunsheng Lei
In this paper, a novel Z-scheme BiOI/ZIF-67 photocatalyst (BOI/ZIF) was successfully prepared using an in-situ growth method, and its effectiveness in degrading tetracycline (TC) under visible light was assessed. Using a range of characterization techniques, the crystal structure, elemental composition, microstructure and optical characteristics of the composite catalyst were examined. Simultaneously, a 30 % mass ratio catalyst (BOI/ZIF-30) could remove 91 % of TC under visible light, which was 41 % and 28 % greater than the degradation rates of BiOI and ZIF-67, respectively. These results demonstrated that BOI/ZIF exhibited strong photocatalytic activity and excellent stability. The results of the radical quenching experiment and electron spin resonance revealed that h + and •O 2 − were the principal chemical substances responsible for TC degradation, corresponding with the suggested charge transfer mechanism of Z-scheme heterojunction. The Z-scheme heterojunction created between BiOI and ZIF-67 improved the effective separation of photogenerated carriers and boosted the efficiency of TC degradation. This study offers a promising method for designing photocatalytic systems to break down antimicrobial contaminants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yanni Luo,Xuecai Tan,David J. Young,Quanyou Chen,Yuehui Huang,Defen Feng,Chenhao Ai,Yan Mi
In photoelectrochemical sensor (PEC sensor), sensitivity and selectivity are two essential factors which are determined by photosensitive of materials and identification of elements. Herein, a novel PEC aptamer sensor for streptomycin-specific detection was developed, with which the visible-light-active TiO 2 /BiOI/BiOBr heterostructure and aptamers were employed as photoactive material and bio-identification elements, separately. The combination of an appropriate amount of TiO 2 with BiOI/BiOBr enhanced the photocurrent response, and thus is beneficial to the construction of PEC sensors. In addition, the one-pot synthesis of TiO 2 /BiOI/BiOBr has the advantage of being environmentally-friendly. Under optimized conditions, the photocurrent response of aptamer/TiO 2 /BiOI/BiOBr/ITO is linear with SRT concentration from 0.05 to 150 nM, and the detection limit (S/N = 3) is as low as 0.04 nM. This novel PEC sensing strategy provided an ultra-sensitive sensor with high selectivity and stability for SRT detection.
研究领域:
生物传感技术
·
材料科学与工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Linfeng Zhang,Xianghui Wu,Jianding Li
To deal with the environmental pollution and energy crises, it is indispensable to find green and efficient means to overcome these challenges. Herein, the Sn-doped BiOI modified multi-shelled ZnO heterojunction composite with a high performance are designed and prepared. The results prove the formation of heterojunction structure in the composites and the morphology is shown as the multi-shelled microsphere. The performances of the composites are evaluated by different kinds of antibiotic degradation and H 2 -evolution under simulation sunlight irradiation. The measurements present that the Sn -BiOI/ZnO (SBZs) could completely remove ciprofloxacin (CIP) within 100 min, which is 4.18 times that of ZnO in kinetics. Typically, the degradation rate of CIP for SBZ6 is over 99.9%, which is more than 25% higher than that of pure ZnO microspheres. In addition, the rate of H 2 production could reach 3.08 mmol g −1 ∙ h −1 , which is 1.79 times of the pure ZnO microspheres. The boosted performance of the composites may originate from the enhanced electronic transmission efficiency and improved separation and recombination efficiency of electrons/holes. The charge transfer mode in the SBZs heterojunction composites is proposed and verified as the Z-scheme by the active species experimental and the possible electron transfer path analysis. Therefore, Sn -doped BiOI is introduced into multi-shelled ZnO microsphere to form contact heterojunction interfacial, which greatly improves the photocatalytic performances of the SBZs. Furthermore, this work supplies a strategy for designing and preparing highly active ZnO-based heterojunction composites, which could effectively address the challenges of environmental remediation and clean energy production.
研究领域:
环境科学
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材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Pingping Teng,Jiabao Zhu,Zhiang Li,Kang Li,Nigel Copner,Shuai Gao,Enming Zhao,Xiaoliang Zhu,Zhihai Liu,Fengjun Tian,Yu Zhang
In this paper, one-dimensional PAN-Bi 2 O 2 CO 3 –BiOI photocatalytic nanofibers were prepared using flexible PAN nanofibers as carriers. Bi 2 O 2 CO 3 was first grown on the surface of PAN nanofibers, and then BiOI was loaded on Bi 2 O 2 CO 3 by ion exchange method. The characterization results showed that PAN-Bi 2 O 2 CO 3 –BiOI nanofibers have a diameter of about 210 nm and regular fiber morphology. The results of UV–Vis diffuse reflectance spectroscopy, XRD and XPS showed that Bi 2 O 2 CO 3 –BiOI composed of granular semiconductor nano heterostructures with high specific surface area were uniformly loaded on the surface of PAN fiber . The photocatalytic degradation experiment of the material showed high visible light photocatalytic activity . The preparation of Bi 2 O 2 CO 3 –BiOI heterojunction improved the photoelectron hole separation efficiency of BiOI under visible light. PAN-Bi 2 O 2 CO 3 –BiOI fibers showed high photocatalytic degradation efficiency for rhodamine B. The degradation efficiency was more than 95% within 120 min irradiation. Free radical trapping experiments showed photocatalysts mainly produced O 2 − ,·OH and h + , which played a major role in photocatalysis .
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 INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Feihu Zhang,Xinyan Xiao,Yu Xiao,Xia Cheng
An innovative 3D flower-like BiOI/Bi 3 O 4 Br hierarchical heterostructures complex material was firstly constructed via in-situ growth of ultrathin BiOI on Bi 3 O 4 Br by a simple precipitation method. Under the simulated solar-light illumination for 90 min, the optimal 60% BiOI/Bi 3 O 4 Br composite displayed the highest photodegradation rate of 96.4% for RhB, 80.0% for TC and 77.2% for MO. The corresponding apparent rate constants were 0.0314, 0.0167 and 0.0110 min −1 , which were 8.26, 1.82 and 3.24-times than that of Bi 3 O 4 Br, 44.86, 11.13 and 2.62-times than that of BiOI. The improved photodegradation activity could be owing to the following reasons: 1) The 3D hierarchical heterostructures endowed BiOI/Bi 3 O 4 Br with tight interfacial contact, which can supply sufficient migration channels for photoinduced carriers; 2) The Z-scheme charge migrate pathway promoted the segregation of photocarriers while maintaining a robust redox ability; 3) The BiOI/Bi 3 O 4 Br heterostructures reinforced light absorption edges more than 600 nm and augmented specific surface areas over 60 m 2 ·g −1 . In addition, the various photocatalytic conditions were studied to imitate the degradation process of RhB in the real aqueous system. The radical capture experiments and EPR test attested that h + and O 2 − played an important part in the photodegradation of RhB.
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
CRYSTENGCOMM
·
2012
·Vol. 14
·期 13
·4384-4390
·
IF 3.842
Kuaixia Ren,Kun Zhang,Jie Liu,Hongde Luo,Yunbo Huang,Xibin Yu
Hollow/flower-like BiOI microspheres have been prepared through a facile precipitation route in a water–ethanol mixed solution with the assistance of PVP and citric acid (CA) at low temperature (70 °C). The obtained products were characterized by a range of methods such as XRD, FESEM, TEM, UV-vis, DRS, PL and nitrogen sorption. A three-stage growth mechanism of such hierarchical hollow/flower-like microstructures has been proposed by observing the XRD analysis and FESEM of the intermediate products at different reaction times. Interestingly, the structure of BiOI from hollow to flower-like could be obtained by only adjusting the different amounts of reagents in the reaction system. The photocatalytic activities of the hollow/flower-like microspheres were evaluated by the degradation of RhB under visible-light irradiation, compared with the nanoplate sample and P25. Although the hollow BiOI microspheres had a higher specific surface area, the flower-like BiOI microspheres exhibited much higher adsorption and photocatalytic activities than the former. This controllable morphology method and particular properties of BiOI hierarchical microstructures could be used to synthesize bismuth-based semiconductors or other structure-controllable materials and to explore remarkable potential applications of their photocatalytic degradation ability.
研究领域:
材料科学
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纳米结构制备
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光催化
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环境化学
·
表面工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4284-4294
·
IF 2.936
Yongmei Xia,Zuming He,Jiangbin Su,Bin Tang,Kejun Hu,Yaling Lu,Shunping Sun,Xiaoping Li
A series of novel flower-like NiFe2O4/BiOI (NFO/BOI) nanocomposites have been synthesized via a facile solvothermal method. The structure, morphology and magnetic, optical and visible-light photocatalytic properties of the as-prepared nanocomposite were respectively characterized by X-ray diffraction, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, vibrating sample magnetometry and UV-visible diffuse reflectance spectroscopy. Experimental results revealed that the weight percent of NiFe2O4 has a considerable effect on the photodegradation of rhodamine B, methylene blue and crystal violet under visible-light irradiation. Compared with pure NiFe2O4 and BiOI, all the heterogeneous NFO/BOI nanocomposites exhibited significantly enhanced photocatalytic efficiency. Among these prepared samples, the NiFe2O4/BiOI nanocomposite with 15% wt NiFe2O4 displayed the best photocatalytic activity. The enhanced photocatalytic performance was mainly ascribed to the efficient separation of photo-induced electron–hole pairs and the formation of highly active species, superoxide radicals (˙O2˙−), in the NFO/BOI photocatalytic oxidation system. Furthermore, the NFO/BOI nanocomposites could be easily separated and recycled from contaminant solution using a magnet, which exhibited great potential application in the treatment of various pollutants in wastewater by utilizing solar energy effectively.
研究领域:
材料科学
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环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jingchao Wang,Siyi Li,Kunlong Yang,Tianyong Zhang,Shuang Jiang,Xianggao Li,Bin Li
Coupling heterojunction is an effective and feasible approach to suppressing the electron–hole recombination of a photocatalyst. However, the heterojunction performance is limited by poor interface contact between two semiconductors. Therefore, an in situ partial conversion procedure was proposed to fabricate the flower-spherical BiOI/Bi5O7I (BBOI) heterojunction using bacitracin as a template. The introduction of bacitracin can regulate the assembly of nanosheets into a flower-spherical structure, which caused the BBOI photocatalysts to have larger specific surface areas than BiOI or Bi5O7I. In particular, the dosage of bacitracin can control the thermal conversion of BiOI to Bi5O7I. The in situ partial conversion of BiOI caused the formation of an intimate S-scheme heterojunction interface between BiOI and Bi5O7I, which efficiently inhibited the combination of photogenerated carriers. Upon visible-light irradiation, BBOI-3 exhibited the highest catalytic ability for the simultaneous reduction of Cr(VI) (100%) and oxidative degradation of tetracycline hydrochloride (TH) (80.0%). This work provides an opinion to construct the high-performance heterojunction photocatalysts to environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3906
·
IF 5.719
Dayu Li,Kai Xu,Chao Zhang
In this study, multiple heterojunction structures of anatase–rutile/Bismuth oxyiodide (BiOI) composite fibers are designed by the combined method of electrospinning and hydrothermal techniques. The influence of different Ti/Bi atomic ratios ([Ti/Bi]) on the nanostructures and photocatalytic properties are investigated. It is found that the morphology of BiOI covered on the TiO2fiber surface changed with [Ti/Bi] from nanosheets to submicron spheres structures. Additionally, the crystallization of the composite fibers including the phases of anatase, rutile, and BiOI is identified, theses phases are in close contact with each other, and the interfacial effects are helpful to form the multiple heterojunctions which lead to blue shifts on the chemical state of Ti. The absorption of visible light has been improved by compositing BiOI on TiO2, while the band gap values of the composite fibers are significantly reduced, which can enhance the generation and separation of electrons and holes. For the case of [Ti/Bi] = 1.57, the photodegradation rate of anatase–rutile/BiOI composite fibers is about 12 times that of pure TiO2. For the photocatalytic mechanism, the synergistic s-type heterojunctions increase the content of active oxides which have a positive effect on the degradation rate.Keywords:photocatalysis;hydrothermal synthesis;multiple heterojunction structure;anatase–rutile/BiOI;composite fiber
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Qicheng He,Zhihao Zhang,Quanxi Zhang,Zhifeng Zhang
Precise control of desirable facets and vacancies is expected to be a promising strategy for improving the photocatalytic performance of catalysts. Herein, BiOI-1 and BiOI-2 were designed and prepared with (102) and (110) as the dominant exposed facets, respectively. Moreover, BiOI-1 and BiOI-2 correspond to the major types VBiIBi and VBiOBiBi, respectively. The experimental results showed that the degradation and mineralization of bisphenol A (BPA) by BiOI-2 could reach 100% and 95.90% under visible light irradiation. The excellent catalytic performance of BiOI-2 is attributed to the optimization of the energy band structure by its special facets and vacancies, and the narrow band gap promotes the separation of photogenerated electron–hole pairs. Meanwhile, the strong reducing property of the conduction band (CB) and the strong adsorption capacity for water and oxygen contribute to the fact that BiOI-2 can generate a large amount of reactive oxygen species (ROS). This work provides an atomic-scale understanding of the synergistic effects of vacancies and facets on catalysts and offers new directions in the management of water environmental pollution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 21
·7353-7361
·
IF 4.099
Zengyu You,Chenyan Wu,Qianhong Shen,Yang Yu,Hao Chen,Yuxuan Su,Hui Wang,Chunchun Wu,Fang Zhang,Hui Yang
An efficient and facile method to fabricate a surficial dispersive heterojunction based on the assembly of g-C3N4 nanoparticles was proposed. A p–n nano heterojunction composed of BiOI and g-C3N4 was constructed by simply loading g-C3N4 nanoparticles on flower-like BiOI nanosheets. The structure-dependent optical, electronic and photoelectric properties were investigated, and the structure–property relationship was discussed. The results show that the g-C3N4 nanoparticles are uniformly loaded on the surface of BiOI nanosheets and thus form a p–n heterojunction with an intimate interface. The as-prepared samples exhibit enhanced photocatalytic degradation ability towards MO under visible-light irradiation. With the unique structure and morphology, enhanced visible-light photocatalytic activities are achieved owing to the synergistic effect of light harvesting, high transfer efficiency and enhanced separation efficiency of photo-generated carriers.
研究领域:
材料科学
·
环境科学
✓ 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）