APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ni Han,Qinfang Zhang
In this work, bismuth-based oxychloride photocatalysts such as BiOCl, Bi 3 O 4 Cl, Bi 12 O 17 Cl 2 , Bi 24 O 31 Cl 10 and Bi 12 O 15 Cl 6 were prepared by a solvothermal (or hydrothermal) method with the controlled amount between Bi(NO 3 ) 3 ·5H 2 O and NH 4 Cl. The as-prepared photocatalysts were analyzed by X-ray diffraction (XRD) patterns, field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance (UV–vis DRS) and photoluminescence (PL) spectra. The photocatalytic activity was evaluated by degrading rhodamine B (RhB) molecules under visible light irradiation. Among those bismuth-based oxychloride photocatalysts, Bi 12 O 15 Cl 6 showed the highest RhB photodegradation activity of 99.85% within 30 min, and its first-order photodegradation rate constant value was 2.30, 5.51, 4.31 and 4.72 folds higher than those of BiOCl, Bi 3 O 4 Cl, Bi 12 O 17 Cl 2 and Bi 24 O 31 Cl 10 , respectively. Bi 12 O 15 Cl 6 had the larger BET specific surface area and pore volume than other samples, which could provide more reactive sites. According to the results of free radical capture experiments, h + played a major role and O 2 - contributed to a lesser extent in the degradation of RhB. Thus, a possible photocatalytic mechanism was proposed. This result showed that the crystal, band structure and morphology of BiOCl, Bi 3 O 4 Cl, Bi 12 O 17 Cl 2 , Bi 12 O 15 Cl 6 and Bi 24 O 31 Cl 10 had a great influence on the photocatalytic performance. This research suggested that the various influencing factors should be studied to better understand the photochemical properties of a photocatalysts. The present work may make some contributions to the field of photocatalysis technology.
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
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2592-2599
·
IF 2.799
Guo Huiyun,Hou Wenlong,Liang Bo,Zhang Haiquan
Abstract A new method of using Sb 2 S 3 solution as precursor and drop-casting process for fabricating Sb 2 S 3 film/ITO combination with heterostructure is proposed. Effect of different substrates on photocatalytic performance was firstly investigated and the results reveal that formation of heterostructure in Sb 2 S 3 film/ITO combination promote the degradation rate of RhB. Graphical Abstract
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
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 2
·893-902
·
IF 2.371
Wang Desong,Xu Zexuan,Luo Qingzhi,Li Xueyan,An Jing,Yin Rong,Bao Cai
An efficient visible-light photocatalyst was successfully synthesized by surface-hybridizing graphitic carbon nitride (g-C 3 N 4 ) using a small amount of cadmium sulfide (CdS) nanoparticles. The CdS/g-C 3 N 4 nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy, and photocurrent–time measurement. The photocatalytic activity of the CdS/g-C 3 N 4 nanocomposites was investigated by evaluating the degradation of Rhodamine B (RhB) under visible-light irradiation. The effects of the CdS content on the nanocomposites, initial RhB concentration, pH value of the investigated system, and dosage of CdS/g-C 3 N 4 nanocomposites on the visible-light photocatalytic activity were systematically investigated. The results revealed that the visible-light photocatalytic activity of g-C 3 N 4 -based photocatalysts was significantly improved by surface-hybridization of a small amount of CdS nanoparticles, increased as both CdS content on the nanocomposites and dosage of CdS/g-C 3 N 4 nanocomposites increased, while increased at first and then decreased as both initial RhB concentration and pH value of the investigated system increased. The visible-light photocatalytic mechanism of the CdS/g-C 3 N 4 nanocomposites was discussed.
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
MATERIALS LETTERS
·
2019
·
IF 3.019
Chengjia Ju,Zhipeng Cheng,Pusu Zhao,XiaoZhong Chu,Hui Zhong,Lili Zhang,Jiming Xu
A novel porous AgBr microstructure with an average diameter of 1–4 μm was prepared for the first time through a facile two-step method, including the formation of AgBr/AgCl alloyed materials and the subsequent removal of AgCl. Field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) were utilized to characterize the morphology, phase structure and elemental composition of the as-prepared products, respectively. The photocatalytic activity of the as-prepared products was investigated by the degradation of rhodamine B (RhB) under visible-light irradiation. The porous AgBr microstructure significantly enhanced the photocatalytic activity compared with AgCl and AgBr/AgCl alloys. The porous AgBr photocatalyst has potential application on pollutant degradation under sunlight.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Haibin Yang,Junzhen Guo,Liang Chu,Zhi Huang,Zhaohui Liu,Liyan Wang,Zhaokun Wang,Mu Yang,Ge Wang
Utilizing natural, abundant, and eco-friendly materials to facilitate the industrial application of nano-sized MOF particles is of utmost importance, since these nanoparticles possess high activity but difficult to recovery. Herein, benefiting from the negatively charged vermiculite , dispersed nano-sized Fe-MOF particles were successfully in-situ grown on the surface of vermiculite nanosheets (VNs) via a simple solvothermal method. The construction of the composites improved the exposure of organic dye to active sites, resulting in a remarkable performance of Fe-MOF@VNs-4 towards photo-Fenton degradation of RhB , with a k value of 0.096 min −1 and an activity of 0.581 mmol g −1 h −1 , significantly higher than that of pure VNs and Fe-MOF, surpassing most reported MOF composite catalysts. The excellent adsorption ability of Fe-MOF@VNs, along with the presence of divalent iron in vermiculite, greatly enhanced catalytic performance. Mechanistic investigations revealed that VNs facilitate the separation of photoinduced carriers excited from Fe-MOF, indicating a synergy effect between Fe-MOF and VNs. Overall, this work provides a simple and effective strategy to design large-scale and commercially available catalysts for water treatment , and also offers a promising alternative for the industrial application of nano-sized MOF particles.
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
ChemistrySelect
·
2023
·Vol. 8
·期 37
·e202300997
·
IF 2.1
Yingying Li,Jiafei Wang,Xiang Wan,Qishu Qu
Graphical SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method, and then TiO 2 was coated on them to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. The use of TiO 2 /graphene composites as catalysts for photodegradation of dyes has been widely investigated. TiO 2 /graphene composites are usually obtained by coating TiO 2 on the surface of pre-prepared graphene. However, graphene is prone to curling and stacking, which makes it difficult to uniformly coat TiO 2 on its surface, resulting in poor photocatalytic performance. In this paper, a non-conventional approach to prepare TiO 2 /graphene nanocomposites based on the use of porous SiO 2 /graphene spheres as supports is presented. SiO 2 /graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method. Then, TiO 2 was coated into the pores of SiO 2 /graphene spheres by sol-gel method to obtain SiO 2 /graphene@TiO 2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. A mechanism of the RhB removal by the SGT composites was proposed.
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
RSC Advances
·
2016
·Vol. 6
·期 46
·39810-39817
·
IF 3.289
Yifan Jiang,Juncheng Hu,Jinlin Li
Tin-doped Bi2S3 (TDB) microspheres assembled by nanosheets with different Sn contents were synthesized via a simple one step solvothermal method. These photocatalysts were characterized by XRD, SEM, TEM, BET, XPS and DRS. The results showed that the TDBs with a portion of Sn4+ substitution at Bi3+ sites in Bi2S3 lattice were consist of nanosheets, Sn dopant can increase the specific surface area and range of light response. What's more, the possible formation mechanism of the unique structure was discussed. It exhibits that the introduction of Sn can improve the photocatalytic activity, and 3 mol% is the optimal content of doped Sn for the degradation of RhB under visible light (λ > 420 nm) irradiation. Compared to the un-doped Bi2S3, the enhanced photocatalytic activities of the TDBs might be attributed to the photo-generated electrons and holes recombination were prevented by doping Sn. The EIS measurements further confirmed the better photogenerated charge carrier separation and transport efficiency of TDBs samples. Moreover, the possible mechanism of photocatalysis process and the possible active species were investigated in detail. This photocatalyst also showed good reusability during the recycled experiments.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Chen Pengfei,Li Jin
SnO 2 quantum dots, ranging from 10 to 30%, were combined with ZnO nanosheets to create a heterojunction photocatalyst. This composite was generated using a basic hydrothermal method, which was then followed by high-temperature calcination to enhance the photocatalytic activity of ZnO. The results showed that the synthesized SnO 2 nanoparticles with tetragonal rutile phase and ZnO nanosheets with hexagonal fibrillar zincite phase, the coupling of SnO 2 quantum dots and ZnO nanosheets improved the separation efficiency of the photogenerated carriers, and at the same time broadened the photoresponse range. Through the degradation of the organic dye Rhodamine B (RhB), the best photocatalytic activity was found at 20% amount of SnO 2 in the composite sample (SZ-2), and the degradation efficiency of RhB reached 96.5% at the light irradiation time of 100 min. In addition, an in-depth study of the photocatalytic mechanism of the constructed heterojunction by active group trapping experiments, and the results showed that •O 2 − and h + were the main active substances in this degradation system. Meanwhile, the SZ-2 photocatalyst was tested for five cycles, and the degradation efficiency of the 5th cycle was 72%. The cycle test indicates that the SZ-2 sample is highly stable and reusable. Therefore, the results showed that the prepared SnO 2 /ZnO heterojunction photocatalysts are suitable materials for degrading organic dyes.
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
JOURNAL OF MATERIALS RESEARCH
·
2013
·Vol. 28
·期 12
·1582-1588
·
IF 1.713
Wenyan Wang,Zhanwei Ma,Runjuan Liang,Tinghua Wu,Ying Wu
SnZn(OH)6 (ZHS) with different morphologies were synthesized by a facile self-templated method at room temperature. It was found that the morphology of ZHS could be controlled by varying the concentration of OH−. The crystalline structure and morphology of the particles were characterized by x-ray diffraction, UV-vis diffuse reflectance spectroscopy, scanning electron microscopy images, and N2 adsorption. The results indicated that the particles had almost uniform monoclinic geometry and uniform size. The photocatalytic activity of ZHS with different morphologies was tested through degradation of Rhodamine B (RhB). Therein, the hollow ZHS showed the highest light catalytic performance due to its large BET surface area, wide band gap, and high crystallinity.
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 SURFACE SCIENCE
·
2021
·
IF 6.707
Huijun Yu,Shasha Xu,Shijie Zhang,Shuguang Wang,Zuoli He
g-C 3 N 4 based heterojunction photocatalysts attract much attention as degradation materials for organic pollutants due to their wide light absorption range and rich photoinduced carriers. Strategies to effectively improve photoelectron separation and transmission have become a research hotspot. Herein, a novel heterojunction TiB 2 -TiO 2 @g-C 3 N 4 photocatalyst with core–shell structure was constructed by in-situ growth of g-C 3 N 4 on the TiB 2 -TiO 2 cores using one-step calcination method. The composite processes a higher photodegradation performance of Rhodamine B (RhB) and 4-Chlorophenol (4-CP) compared to the pure g-C 3 N 4 . The results show that the surface of TiB 2 -TiO 2 cores contains numerous ‘TiB 2 bridges’, as photoinduced carriers transport channels, which effectively accelerate photoinduced e - and h + migration. In addition, the g-C 3 N 4 coated on TiB 2 -TiO 2 cores forms a Z-scheme heterojunction, which hinders the recombination of photogenerated charges resulting in a longer electron lifetime. Furthermore, the TiB 2 also could act as acceptors of electrons for the formation of •O 2– . The main active substances for degradation of RhB are •OH, •O 2– and h + . This strategy is applicable to design highly capable heterojunction photocatalysts by constructing fast electronic transmission channels.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Chong Liang,Mingyu Cui,Wei Zhao,Linyang Dong,Shangshang Ma,Xutang Liu,Dingkai Wang,Zhijie Jiang,Fei Wang
Photocatalytic technology has been considered as a promising method to alleviate environmental pollution owing to the dual characteristics of redox. The novel V-based H 5 PMo 10 V 2 O 40 (HPA-2) photocatalyst with Z-scheme heterostructure was constructed. The energy level of HPA-2 matches well with CdS and g-C 3 N 4 (CN) according to Mott-Schottky and UV–Vis diffused reflectance tests, which allows the efficient separation of photogenerated electrons. The optimized CdS/HPA-2/CN showed superior ability in Rhodamine B (RhB) degradation and reduction of Cr (Ⅵ) under visible light irradiation. The maximum rate constant reached 0.092 min −1 for RhB degradation at 60 min and 0.260 min −1 for Cr (Ⅵ) reduction at 20 min, respectively. The photocatalytic mechanism was analyzed by adding scavengers. The effect of active species for RhB degradation was determined as h + > ·O 2 − > ·OH, while ·O 2 − and e − were essential for the reduction of Cr (Ⅵ). Besides, cyclic tests exhibit excellent repeatability and stable structure of CdS/HPA-2/CN after four cycles. Meanwhile, the detailed degradation process of RhB involving de-ethylation, hydroxylation, substitution and decarboxylation was determined according to LC-MS and evaluated by Fukui function calculation. Furthermore, total organic carbon content decreased to 6.2% of the initial value. In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z-scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in the environmental remediation by photocatalysis .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Jiaqi Zhang,Jin Li,Xiangyu Liu
The degradation of organic dyes and other pollutants has always been one of the great challenges facing mankind today. So our work designed and improved a novel composite, by using zinc oxide (ZnO) nanoparticles to modify porous carbon nitride (g-C 3 N 4 ), and then load graphene oxide (Go) nanosheets . These prepared binary and ternary composites with different weight ratios were subjected to a series of tests. The results showed that when the weight ratio of g-C 3 N 4 was 40%, the binary composite ZnO-g-C 3 N 4 transferred its absorption edge to lower energy and had the best photocatalytic performance. Moreover, the addition of Go immensely cut down the recombination of photo-generated carriers and enhanced the absorption in the visible light range. The ZnO-g-C 3 N 4 (40%)-Go (15%) displayed 98% degradation efficiency in 100 min, the rate was about 2.23 times than ZnO-g-C 3 N 4 (40%). XRD , XPS, TEM proved the successful hybridization of the composite, and PL explained the causes for the amendment of photocatalytic efficiency. The conduction band and valence band potential of the material were calculated by VB-XPS, and combined with the free radical capture experiment proved the most effective free radical in this experiment and proved the reaction mechanism of the photocatalytic reaction. Through the photocurrent and EIS the results analyzed the high responsivity of the material and the low photogenerated e − /h + recombination rate. In brief, the interface effect and synergistic effect of the ternary heterojunction greatly enhanced the photocatalytic degradation of toxic dyes.
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）