CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Qian Wen Cao,Yi Fan Zheng,Xu Chun Song
A series of energy band adjustable Bi 2 W x Mo 1−x O 6 -BiOCl (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) heterojunctions were successfully synthesized through a solvothermal crystallization method. Characteristics and properties of the products were investigated using XRD , TEM , HRTEM , EDS , and DRS. Meanwhile, the photocatalytic activities of Bi 2 W x Mo 1−x O 6 -BiOCl composites were estimated by degrading Rhodamine B (RhB) under visible light irradiation. The results show that Bi 2 W 0.6 Mo 0.4 O 6 -BiOCl (1:14) composite displayed the best photocatalytic performance among all the as-prepared samples. The enhanced visible-light photocatalytic activities of Bi 2 W x Mo 1−x O 6 -BiOCl heterojunctions could be attributed to the generation of the adjustable energy band configuration, which has great influences on the generation of photoinduced carriers through inhibiting the recombination of electron-hole pairs. According to the active species trapping results and energy band calculation, the mechanism of the significant enhancement of the photocatalytic activity was proposed. This method may provide new insights into the energy band adjusting of photocatalysts used in environmental remediation and photocatalytic water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Lianyang Zhang,Yue Meng,Hui Shen,Jinhua Li,Chunfang Yang,Bo Xie,Shengjie Xia
In this work, the advantages of in situ loading, heterojunction construction, and facet regulation were integrated based on the poly-facet-exposed BiOCl single crystal, and a facet-oriented supported heterojunction of Cu2O and BiOCl was fabricated (Cu2O@BiOCl[100]). The photocatalytic nitrogen reduction reaction (pNRR) activity of Cu2O@BiOCl[100] was as high as 181.9 μmol·g–1·h–1, which is 4.09, 7.13, and 1.83 times that of Cu2O, BiOCl, and Cu2O@BiOCl-ran (Cu2O randomly supported on BiOCl). Combined with the results of the photodeposition experiment, X-ray photoelectron spectroscopy characterization, and DFT calculation, the mechanism of Cu2O@BiOCl[100] for pNRR was discussed. When Cu2O directionally loaded on the [100] facet of BiOCl, electrons generated by Cu2O will be transmitted to the [100] facet of BiOCl through Z-scheme electron transmission. Due to the directional separation characteristics of charge in BiOCl, the electrons transmitted from Cu2O are enriched on the [001] facet of BiOCl, which will together with the original electrons generated by pristine BiOCl act on pNRR, thus greatly improving the activity of photocatalytic ammonia synthesis. Thus, a new construction scheme of biphasic semiconductor heterojunction was proposed, which provides a reference research idea for designing and synthesizing high-performance photocatalysts for nitrogen reduction.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 9
·4017-4029
·
IF 3.442
Wu Ke,Qin Zhaogang,Zhang Xunshuang,Guo Ruichen,Ren Xiaozhen,Pu Xipeng
Researchers have begun to pay close attention to the construction of artificial Z-scheme photocatalysts due to their excellent ability to separate photogenerated electron–hole pairs and prominent redox ability. In this study, Bi-bridged Z-scheme BiOCl/Bi 2 O 3 (BiOCl/Bi–Bi 2 O 3 ) heterojunctions with oxygen vacancies were prepared via a one-step hydrothermal method. The phase structure, morphology, and optical properties of the samples were characterized using XRD, XPS, ESR, FESEM, HRTEM, and UV–Vis DRS. Compared with BiOCl and Bi–Bi 2 O 3 , the prepared BiOCl/Bi–Bi 2 O 3 (25% and 50%) samples exhibited enhanced photocatalytic activity in degrading colorless antibiotics (tetracycline hydrochloride) and colored dyes (RhB) under visible light irradiation. This result indicated improved visible light absorption due to the presence of oxygen vacancies and enhanced separation efficiency of the photogenerated electron–hole pairs and high redox ability due to the construction of the Z-scheme. On the basis of the results of radical-trapping, photoelectron chemical experiments, and PL analysis, a possible photocatalytic mechanism of the Z-scheme BiOCl/Bi–Bi 2 O 3 heterojunctions was proposed.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yi Xiao,Zeqing He,Renshan Wang,Xueqin Tao,Benxia Li
Notwithstanding intensive research in recent decades, the conspicuous restrictions in photocatalysts still remain as low utilization of visible light, poor charge transfer/separation, and insufficient surface active sites. Designing semiconductor heterostructures as photocatalysts is a promising approach to enhance the photocatalytic efficiency for degrading organic pollutants. In this work, a novel WO 3 /BiOCl p–n heterostructure photocatalyst with optimal molar ratio was successfully fabricated by growing BiOCl nanosheets on WO 3 nanofibers through the electrospinning method followed with a solvothermal process. The optical properties and photoelectrochemical tests indicated that the WO 3 /BiOCl heterostructures possess high ability of photogenerated charge separation. The photocatalytic performance of the as-obtained materials was assessed by the degradations of rhodamine B (RhB) and phenol in water under visible light. Compared with pure WO 3 nanofibers and BiOCl nanosheets, the WO 3 /BiOCl heterostructure catalysts showed improved photocatalytic efficiencies, and the apparent rate constant of RhB degradation is 0.259 min −1 on the optimal WO 3 /BiOCl(2) sample, which is about 2.3 times that of pure BiOCl (0.113 min −1 ). The roles of different active species in the photocatalytic system were determined by active-species-eliminating experiments, revealing that the photogenerated holes play a leading function in the degradation of organic pollutants. The enhanced photocatalysis of WO 3 /BiOCl(2) heterostructures results from the joint effect of high activity of BiOCl nanosheets, anti-agglomeration of WO 3 nanofibers, and well-matched straddling band-structures for charge separation. This photocatalyst presents great potential in the removal of organic pollutants from aquatic environment.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Xiaoya Gao,Chao Gong,Xi Wang,Wenjie Zhu,Yongming Luo
Herein, novel cobalt-doped bismuth oxychloride ultrathin nanosheets (BiOCl–Co-T) were facilely synthesized by tetrabutylammonium hydroxide (TBAOH) assisted hydrolysis route in water at ambient conditions. Characterizations were performed to investigate the structure, morphology, light absorption ability, electric property, BET surface area and pore structure of the as-prepared samples. The photocatalytic performance was investigated by degrading the persistent contaminant of carbamazepine (CBZ) under visible light irradiation . Results showed that the BiOCl–Co-T displayed enhanced visible-light-driven photocatalytic activity due to the expanded light absorption region and facilitated photogenerated carrier separation. Compared with the degradation efficiencies of 48.4 and 53.8% in BiOCl–Co and BiOCl-T, BiOCl–Co-T exhibited significant improved degradation efficiency of 86.4% within 180 min under visible light irradiation. Quenching experiments suggested that holes ( h + ), superoxide radicals (·O 2 - ), and hydroxyl radicals (·OH) participated in CBZ degradation over BiOCl–Co-T. The obtained result provides a new insight to fabricate visible-light-driven photocatalyst with ultrathin nanosheets shaped structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.262
Sarenqiqige Bao,Haiou Liang,Chunping Li,Jie Bai
Heterojunction of TiO2 nanoparticles and BiOCl nanosheets grown on the carbon nanofibers (CNFs) were prepared by simply process that combine of electrospinning, solvothermal, and calcine. The photocatalytic activity of the as-obtained samples was evaluated by photodegradation of tetracycline (TC) in visible light irradiation (λ ≥ 420 nm). Compared with CNFs and TiO2/CNFs, BiOCl/TiO2/CNFs composites performed the best photocatalytic degradation performance (82%) and good stability. Moreover, the degradation rates of Norfloxacin, Ciprofloxacin, and Oxytetracycline are all more than 90%. Finally, trapping experiments were carried out, and a possible photocatalytic degradation mechanism was proposed.
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
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 1
·309-318
·
IF 2.606
Yu Yong,Shang Zhichao,Yang Zhongxiang,Wang Xiaohong,Feng Peizhong
The Fe(III)-doped BiOCl catalyst was successfully prepared via a one-step solution combustion synthesis (SCS), and they were characterized by XRD, FESEM, HRTEM, XPS, PL and DRS analysis. With the doping of Fe(III), the SCS catalysts become finer and more uniform, and show narrowed bandgap, which makes the Fe(III)-BiOCl can be excited to form photogenerated electrons and holes under visible light irritation and improve the photocatalytic performance. Compared with the SCS BiOCl, the FB1-2 sample exhibits doubled surface area (9.62 m 2 /g), narrowed bandgap (1.35 eV) and quadrupling degrading efficiency for Rhodamine B (RhB) (93% at 60 min). In addition, through the capturing of free radicals, the photocatalytic degradation mechanism of RhB was proposed, in which the active substances ∙O 2 − and h + played a leading role in the degradation process. Owing to the novel one-step combustion process and resulting in excellent photocatalytic performance, the Fe(III) doping BiOCl is demonstrated as a prospective catalyst for degrading dye pollutants.
Graphical abstract
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
·
2021
·
IF 10.588
Zeqing Long,Hongliang Wang,Kaiwen Huang,Guangming Zhang,Haijiao Xie
Photocatalytic oxidation of contaminants in water has recently gained extensive attentions. In this study, Cu 2+ - doped BiOCl microsphere photocatalysts were prepared using solvothermal method. The effects of Cu 2+ doping ratio on the morphological structures and photoelectric and photocatalytic properties of BiOCl were studied in detail. Results showed that Cu 2+ doping affected the particle size of BiOCl microspheres. The introduction of Cu 2+ ions gradually increased the light absorption range and decreased the electron recombination rate of photocatalysts as shown by ultraviolet-visible diffuse reflection and photoluminescence spectra. The best doping ratio was 0.25 Cu 2+ -BiOCl, showing the highest photocatalytic activity for rhodamine B (14.25 time higher than BiOCl) and a good inhibition of algal growth. The main reactants in the photocatalytic system were·OH and h + (electron holes). Density functional theory (DFT) calculations further demonstrated that the doping of Cu 2+ ions made the photogenerated carriers in BiOCl easier to generate and ensured the charge was transferred more rapidly. In conclusion, a novel high-efficiency multifunctional photocatalyst is proposed for the efficient organic pollutants removal and algae growth inhibition from water.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Longqiang He,Xiaohua Wang,Dapeng Hong
Fe-doped BiOCl (Fe-BiOCl) hierarchical microspheres were successfully prepared by using a simple one-step solvothermal approach. The Fe-BiOCl hierarchical microspheres were analyzed by XRD, IR, SEM, XPS, TEM, etc. The analyses confirmed that impurity levels were successfully introduced into the band gap of BiOCl through Fe doping, leading to a decrease in the band gap and an expansion of the light absorption range to the visible region. Moreover, the separation and transfer of photogenerated carriers were more effectively promoted by Fe doping, resulting in a substantially elevated photocatalytic performance of BiOCl. After 40 min of dark adsorption and 60 min of photocatalysis, the removal efficiency of the prepared Fe-BiOCl-3 for methylene blue reached 93.5%, and the degradation reaction was accorded with a first-order kinetic law. After 5 cycles of photodegradation, Fe-BiOCl-3 still maintained its high photocatalytic ability, indicating that it had a certain degree of reusability. The active species capture experiment demonstrated that •O2– and •OH played a predominant role during the photocatalytic degradation process. Combined with the active species capture experiment, the photocatalytic degradation mechanism of Fe-BiOCl-3 was put forward.
研究领域:
材料科学
·
环境科学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Yan Zheng,Xun Hu,Changming Wu,Mingxu Chen,Qifeng Chen,Yi Wang,Song Hu,Jun Xiang,Qing Liu,Xiao Zhang,Ping Yang
Preparation of BiOCl with excellent photocatalytic performance via a simple and controllable method is significant for the environmental protection. In this study, microspheric BiOCl with outstanding photocatalytic performance was fabricated through a binary solvent-mediated strategy. The morphologies and phases of samples were controlled by regulating the ratio of ethylene glycol (EG) and N, N-dimethylformamide (DMF). As the ratio of EG/DMF decreased, the phases of samples transformed from BiOCl to Bi/BiOCl and the size of the samples become larger. Through exploring the growth mechanism of the synthesized samples, the viscosity of binary solvent was found to be effective in the growth process. When the ratio of EG/DMF was 1/5, the samples exhibited the better photocatalytic performance in the degradation of Rhodamine B than the samples obtained at the single solvent and commercial TiO 2 . This superior photocatalytic performance for the samples prepared in binary solvent of EG/DMF with the ratio of 1/5 was attributed to the microsphere morphologies with appropriate size, largest specific surface areas with mesopore structure and strong adsorption ability. Furthermore, the photocatalytic mechanism in the degradation of Rhodamine B was also proposed based on the experiment of trapping active species.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kuan Wang,Tong Sun,Hui Ma,Yi Wang,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Lei Wang,Zhao-Tie Liu
The photo-driven CO 2 reduction holds significant potential in facilitating carbon fuel conversion. However, the inefficiency of charge conversion severely limits its spractical applications. Herein, the charge transfer routeway was tailored in NiO/BiOCl-7 heterostructures via a transform from type-II to S-scheme for enhancing CO 2 photoreduction to CO. Such S-scheme NiO/BiOCl-7 heterojunctions were prepared by pH-modulation to optimize the energy band structure of BiOCl and introduce abundant oxygen vacancies. Surprisingly, the S-scheme NiO/BiOCl-7 heterojunctions exhibited a significantly enhanced production of CO (78.11 μmol·g −1 ·h −1 ) with an impressive selectivity of 97.1 %, representing a remarkable 1.7- and 4.3-fold improvement in CO yield compared to the type-II NiO/BiOCl heterojunctions and pure BiOCl samples, respectively. The in-situ spectral experiments and DFT calculations reveal that the superior CO production can be attributed to a lower energy barrier for COOH* and a smoother potential energy surface of the S-scheme heterojunction with abundant oxygen vacancies. This meticulous strategy of energy band modulation sheds light on the deliberate customization of Bi-based heterostructures with favorable charge transfer for highly effecient photocatalysis.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Qi Li,Jie Ren,Ying-juan Hao,Yi-lei Li,Xiao-jing Wang,Ying Liu,Ran Su,Fa-tang Li
Hydroxyl radicals always play important role in the photocatalytic degradation of pollutants and thus lots of efforts have been made to enlarge their amount. Herein, BiOCl photocatalysts with different surface hydroxyl groups amount are synthesized using ionic liquid self-combustion (C-BiOCl) and hydrothermal method (H-BiOCl) to deep understand the roles of hydroxyl radicals in toluene mineralization. It is found that hydroxyl radicals in H-BiOCl have reverse inhibitory effect on the ring-opening reaction in the photocatalytic mineralization process of toluene and C-BiOCl exhibits more excellent ability and stability in mineralizing toluene. The reason is that C-BiOCl lacking hydroxyl groups can selectively generate benzoic acid by holes and superoxide anion radicals; while H-BiOCl with large number of hydroxyl groups will lead to the production of hydroxyl radicals and phenolic intermediates, which will preferentially cover active sites such as oxygen vacancies, thereby reducing the performance and stability of the catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）