7787-59-9Relevant articles and documents
Tunable Synthesis of Ultrathin BiOCl 2D Nanosheets for Efficient Photocatalytic Degradation of Carbamazepine upon Visible-Light Irradiation
Gao, Xiaoya,Jin, Pengfei,Kuang, Yongmei,Sarkar, Tapan,Xu, Shuo,Xu, Wenfeng
, (2020)
A series of ultrathin BiOCl 2D nanosheet photocatalysts were prepared by the TBAOH-assisted hydrolysis method in water. The effects of tetrabutylammonium hydroxide (TBAOH) dosages, chlorine source, preparation pH value, ultrasonic treatment, and magnetic stirring on the photocatalytic degradation dynamics of carbamazepine were examined under visible-light irradiation to optimize the preparation parameters. It was found that ultrathin BiOCl prepared with TBAOH dosages of 1 mmol and chlorine source of NaCl in the pH of 2 upon magnetic stirring of 6 h displayed the highest photocatalytic degradation rate constant (0.0038 min-1) of carbamazepine, which is 7.6 times higher than that with the ordinary BiOCl (without TBAOH). To clarify the mechanism on the outstanding photocatalytic activity of ultrathin BiOCl, the elemental composition/state, micromorphology, and separation efficiency of photogenerated electron-hole pairs were investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and photoluminescence (PL). Results showed that the presence of oxygen vacancy, ultrathin nanosheet structure, and improved separation efficiency of photogenerated electron-hole pairs contributed to the excellent photocatalytic degradation activity of ultrathin BiOCl. The obtained result provides a novel method to fabricate ultrathin BiOCl with excellent photocatalytic degradation activity of carbamazepine under visible-light irradiation.
The characteristics and photocatalytic activities of BiOCl as highly efficient photocatalyst
Pare, Brijesh,Sarwan, Bhawna,Jonnalagadda
, p. 196 - 202 (2012)
BiOCl was synthesized by hydrolysis method. In order to evaluate their photocatalytic activity, this compound was tested on the degradation reaction of methylene green in aqueous solution. The characterization of the compound included: X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopic image (TEM). MG could be efficiently degraded in aqueous suspension of BiOCl under visible light irradiation. Complete removal of aqueous methylene green (MG) was realized after visible light irradiation for 120 min with existing BiOCl as a catalyst. The decrease of the chemical oxygen demand (COD), the formation of inorganic products (SO42- and NO3-) confirmed complete mineralization of aqueous MG during the photocatalytic process.
In-situ precipitation synthesis of novel BiOCl/Ag2CO3 hybrids with highly efficient visible-light-driven photocatalytic activity
Fang, Shanshan,Ding, Chaoying,Liang, Qian,Li, Zhongyu,Xu, Song,Peng, Yanyan,Lu, Dayong
, p. 230 - 236 (2016)
Novel BiOCl/Ag2CO3 hybrid photocatalysts were facilely fabricated in situ precipitation method. The as-prepared samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (FE-SEM), X-ray diffra
One-dimensional BiPO4 nanorods and two-dimensional BiOCl lamellae: Fast low-temperature sonochemical synthesis, characterization, and growth mechanism
Geng, Jun,Hou, Wen-Hua,Lv, Yi-Nong,Zhu, Jun-Jie,Chen, Hong-Yuan
, p. 8503 - 8509 (2005)
Regular BiPO4 nanorods, for the first time, and BiOCl lamellae have been successfully synthesized via a facile sonochemical method in a surfactant/ligand-free system under ambient air. The as-prepared products are characterized by XRD, TEM, SAED, FE-SEM, HRTEM, and Raman spectroscopy. The effects of pH and ultrasound irradiation on the phase and morphology of the products are studied and the sonochemical formation mechanisms of 1D and 2D structures are discussed. TEM data from samples made after different reaction times suggest an ultrasound-induced nucleation and an oriented-attachment growth mechanism.
Inlay of Bi2O2CO3 nanoparticles onto Bi2WO6 nanosheets to build heterostructured photocatalysts
Xu, Yang-Sen,Zhang, Ze-Jun,Zhang, Wei-De
, p. 3660 - 3668 (2014)
Surface-dispersive-type Bi2O2CO3/Bi 2WO6 heterostructured nanosheets were successfully prepared via anion exchange in a hydrothermal process with the graphitic carbon nitride (g-C3N4) as a precursor of CO3 2-. The Bi2O2CO3 nanoparticles (with diameters about 5 nm) were highly homogeneously dispersed and inlaid in the single-crystalline Bi2WO6 nanosheets. The composites with intimate interfacial contacts between Bi2O2CO3 and Bi2WO6 exhibited superior visible light photocatalytic activity towards the degradation of rhodamine B (RhB). The composite nanosheets containing 7.86 wt% Bi2O2CO3 showed the best performance and the degradation rate of RhB was 6 times faster than that with the bare Bi2WO6. The dramatic enhancement of the photocatalytic activity of the Bi2O2CO3/Bi 2WO6 photocatalysts can be attributed to the hetero-interfaces between Bi2O2CO3 and Bi 2WO6, their intrinsically layered structure, two-dimensional morphology and the effective separation of the photoinduced carriers at the interfaces and in the semiconductors. This method can be used to design and prepare other Aurivillius heterostructured semiconductors for efficient light harvesting and energy conversion applications.
Template-free synthesis and enhanced photocatalytic performance of uniform BiOCl flower-like microspheres
Chang, Fei,Xie, Yunchao,Chen, Juan,Luo, Jieru,Li, Chenlu,Hu, Xuefeng,Xu, Bin
, p. 1421 - 1426 (2015)
Preparation of uniform BiOCl flower-like microspheres was facilely accomplished through a simple protocol involving regulation of pH value in aqueous with sodium hydroxide in the presence of n-propanol. The as-prepared samples were characterized by a collection of techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and nitrogen adsorption-desorption isotherms. Based upon the SEM analyses, uniform microspheres could be formed with coexistence of some fragments of BiOCl nanosheets without n-propanol. The addition of appropriate amount of n-propanol was beneficial to provide BiOCl samples containing only flower-like microspheres, which were further subjected to the photocatalytic measurements towards Rhodamine B in aqueous under visible light irradiation and exhibited the best catalytic performance among all samples tested. In addition, the photocatalytic process was confirmed to undergo through a photosensitization pathway, in which superoxide radicals (?·O-2-) played critical roles.
Oriented attachment growth of BiOCl nanosheets with exposed {1 1 0} facets and photocatalytic activity of the hierarchical nanostructures
Cui, Zhankui,Mi, Liwei,Zeng, Dawen
, p. 70 - 76 (2013)
The formation mechanism of nanosheet assembled BiOCl nanostructures in non-aqueous solvothermal system was investigated through time series experiments. The products obtained at different reaction times were characterized by XRD, SEM and (HR)TEM technique
Enhanced visible light photocatalytic activity of AgBr on {001} facets exposed to BiOCl
Qi, Yi Ling,Zheng, Yi Fan,Yin, Hao Yong,Song, Xu Chun
, p. 535 - 542 (2017)
The facet dominated AgBr/BiOCl composites with exposed {001} (BiOCl-001) and {101} (BiOCl-101) facets were prepared by facile solvothermal and chemical precipitation process. Microstructures, morphologies, photoelectron and band gap energy of the as-prepared composites were characterized by various experimental methods. The AgBr/BiOCl heterojunctions showed a much higher photocatalytic performance than pure AgBr and BiOCl in photodegradation of Rhodamine B (RhB) under visible light irradiation. In addition, the AgBr-{001}BiOCl with the mole ratio of 1:2 showed the highest photocatalytic performance with the RhB completely degraded in 15?min. The better photocatalytic performance of AgBr-{001}BiOCl may attribute to the fact that {001} facet of BiOCl was beneficial for the separation of photo-generated carriers and more oxygen vacancy can be formed on the surface {001} facets of BiOCl. Moreover, the photocatalytic mechanism of AgBr-{001}BiOCl composites were also discussed.
Investigation of adsorption and photocatalytic activities of: In situ cetyltrimethylammonium bromide-modified Bi/BiOCl heterojunction photocatalyst for organic contaminants removal
Li, Wentao,Xiao, Feng,Su, Hang,Wang, Dongsheng,Yang, Xiaofang
, p. 93309 - 93317 (2016)
Bi/BiOCl heterojunction was prepared via a hydrothermal method, using cetyltrimethylammonium bromide (CTAB) as a stabilizing agent. The structure and chemical properties of Bi/BiOCl with the three different CTAB contents were thoroughly analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), field-emission scanning electron microscope (FESEM), high resolution transmission electron microscope (HRTEM), UV-vis diffuse reflectance spectra (UV-vis DRS), zeta potential, and carbon element analysis, the results indicates that there are some important interactions between CTAB and Bi/BiOCl, resulting in decreasing the band gap of Bi/BiOCl with the increase of CTAB content. Two typical dyes, rhodamine B (RhB) and methyl orange (MO) which has different surface charges, were choosed as the target pollutants. Under the visible light (λ = 420 nm), the photocatalytic efficiency of Bi/BiOCl with a higher CTAB (Bi/BiOCl-a) was 3.72-fold more than that of Bi/BiOCl with a lower CTAB (Bi/BiOCl-c) to remove RhB. Bi/BiOCl heterojunction alone exhibited a poor degradation capability for the MO such as 5% of MO photodegradation with Bi/BiOCl-c. In contrast, MO removal efficiency by the Bi/BiOCl-a was 100%. Hence, the CTAB could play an important role to enhance the removal of dyes. Firstly, CTAB could absorb the target pollutants near the surface of Bi/BiOCl due to the electrostatic attraction and dispersion interaction; then Bi/BiOCl could degrade the pollutants via the in situ h+ or O2- under the visible light. The proposed mechanism was supported by the FTIR and adsorption analysis.
