JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 5
·1515-1519
·
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
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Xuguang Li,Tong Li,Tong Zhang,Cheng Gu,Shourong Zheng,Haijun Zhang,Wei Chen
Nanoscale titanium dioxide (nTiO2) is one of the most widely used metal oxide nanomaterials. Once released into the environment, nTiO2 may catalyze abiotic transformation of contaminants and consequently affect their fate and effects. Here, we show that the overall catalytic efficiency of nTiO2 for the dehydrochlorination reaction of 1,1,2,2-tetrachloroethane, a commonly used solvent, depends on the crystalline phase and exposed facets of nTiO2, which significantly affect the adsorption capacity and surface catalytic activity of nTiO2. Specifically, under all three pH conditions tested (7.0, 7.5 and 8.0), the overall catalytic efficiency of eight nTiO2 materials (as indicated by the surface-area-normalized reaction kinetic constants) followed the order of rutile > anatase > TiO2(B). For anatase and TiO2(B) materials, the overall catalytic efficiency increased with the increasing percentage of exposed {001} and {010} facets, respectively. Crystalline phase and exposed facets significantly affected adsorption affinities of nTiO2, likely by modulating surface hydrophobicity of nTiO2. Crystalline phase and exposed facets also determined the activity of surface catalytic sites on nTiO2 by dictating the concentration and strength of surface unsaturated Ti atoms, as the deprotonated hydroxyl groups chemisorbed to these reactive Ti atoms served as bases to catalyze the base-promoted reaction.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Xuyang Xiong,Liyong Ding,Qingqian Wang,Yongxiu Li,Qingqing Jiang,Juncheng Hu
A series of BiOBr nanosheets with tunable exposing proportion of (0 1 0) facets had been synthesized. In the synthesis process, different n -alcohols are used, which not only promote the exposure of (0 1 0) facets, but also modulate the size and thickness of these BiOBr nanosheets in a wide range. Furthermore, these nanosheets showed an efficient photodegradation activity for salicylic acid (SA) and Rhodamine B (RhB). By comparison, the sample prepared in n -hexanol possessed the highest photocatalytic activity than those synthesized in n -butanol and methanol, respectively. This excellent photocatalytic activity was attributed to the thin lamellar thickness and the exposure of (0 1 0) facets, which facilitated the separation of photoinduced electrons and holes.
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
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 2
·479-485
·
IF 3.806
Yue Xu,Sichao Xu,Shuan Wang,Yunxia Zhang,Guanghai Li
Well-crystallized BiOCl nanoplates with exposed {001} facets were synthesized by a facile electrochemical anodic oxidation method. The thickness of the nanoplates decreases with increasing citric acid content in the electrolyte. The optical absorption edge of the BiOCl nanoplates shifts to a longer wavelength with citric acid. The BiOCl nanoplates obtained with citric acid show a high photocatalytic activity for degrading rhodamine B (RhB) as compared with that without citric acid. The photocatalytic activity of BiOCl nanoplates is higher in degrading RhB dyes than in degrading rhodamine 6G, methyl orange and methyl blue dyes. The superoxide radical and holes are the two major active species in photocatalytic degradation of RhB by BiOCl nanoplates. Citric acid can decrease the overlap in the layered structure of BiOCl and reduce the nanoplates thickness, leading to the increase in the exposure of {001} facets and the enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Zeng,Xutao Ning,Linfang Li
Herein, a novel zinc oxide (ZnO) hexagonal cap with exposed polar facets/MXene composite was synthesized via a simple hydrothermal method . The analysis of the morphology and structure of these composites as well as the results of photochemical property measurements showed that a heterojunction was formed between ZnO and MXene . After testing the photocatalytic degradation of methyl orange, the ZnO hexagonal cap with 3 mL MXene showed the highest photodegradation efficiency of 87.8 % within 60 min under a xenon lamp. Active species capture experiments showed that •OH and h + species were the main contributors to the degradation of methyl orange (MO). We proposed a possible mechanism for the excellent photocatalytic activity of ZnO hexagonal cap@Ti 3 C 2 MXene. The Schottky barrier hindering the photogenerated electron recombination, the hexagonal cap morphology with highly active exposed facets, and the hollow structure favoring the adsorption of contaminants were all beneficial to achieve a high catalytic activity. This work provides new insight into the design of metal oxide/MXene photocatalysts .
研究领域:
材料科学
·
化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·919-932
·
IF 7.848
Jiahao Hu,Jie Ding,Jianping Ai,Honglin Li,Shaozhi Li,Qingbo Ma,Lihui Luo,Xiaoling Xu
In this article, the flower-like, urchin-like, and rod-like ZnOs were synthesized by a convenient atmospheric hydrothermal method. The crystalline structures, morphologies, exposed crystal faces, and specific surface areas of the as-prepared ZnO samples were analyzed. Rhodamine B (RhB) was used as the simulated pollutant to evaluate the photocatalytic performance of the ZnO nanostructures. The flower-like ZnO prepared by controlled hydrothermal method at room temperature for 2 h displayed highest specific surface area and exposed more high active
{
2
1
¯
1
¯
0
}
facets compared to the other two morphologies of ZnO. In addition, within 2 h of the photocatalytic reaction, the flower-like ZnO results in 99.3% degradation of RhB and produces the most hydroxyl radicals (˙OH) 47.83 μmol/g and superoxide anions (˙
O
2
−
) 102.78 μmol/g. Due to the existence of oxygen vacancies on the surface of
{
2
1
¯
1
¯
0
}
facets, the flower-like ZnO can efficiently catalyze the production of active oxygen, leading to the improvement in the photocatalytic efficiency.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huiyu Yi,Chenge Liang,Yungui Li,Haoran Niu,Suorong Zhang,Moudong Hu,Wenhai Huang,Qile Fang
Prussian blue analogs (PBAs) are promising catalysts in heterogeneous oxidation processes. The catalytic activity of PBAs relies on exposed crystal facets and accessible active sites on the PBA framework. Employing a heteroatom doping strategy using a rare earth element (La), we regulated the crystal structure and optimized the catalytic activity of CoFe PBA for peroxymonosulfate (PMS)-driven degradation of the antibiotic norfloxacin (NOR). The La atoms were mainly doped in the interstitial sites of the CoFe PBA cubic lattices, without affecting the electron distributions of Co and Fe metals or the face-centered cubic crystal phase of the coordination skeleton. La doping dominated the (1 1 1) and (1 0 0) as the main exposed facets of CoFeLa PBA, increasing the affinity of CoFeLa PBAs for PMS adsorption due to the higher surface energy of the two facets. Consequently, the activation energy considerably declined from 77.57 kJ/mol in CoFe PBA to 51.66 kJ/mol in CoFeLa PBA and the catalytic activity for PMS-driven NOR degradation was largely improved, which can reach 76.4 % removal of NOR within 15 min, with an increased initial rate constant k of 0.095 min −1 . 1 O 2 was proven as the main reactive specie responsible for NOR degradation in the PMS/CoFeLa system, and O 2 · − and SO 4 · − were verified as the important intermediates to generate 1 O 2 . Thus, La doping can effectively enhance the catalytic performance of PBA-based catalysts for organic pollutant removal.
研究领域:
材料科学
·
环境化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
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