Journal of Water Process Engineering
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2024
·
IF 6.3
Chuangbin Hong,Jiehang Zhou,Wenguang Wang,Liangpeng Wu,Shimin Long,Wentao Zhou,Yuxi Guo
Catalytic activation of peroxymonosulfate (PMS) is one of the important research areas in the development of advanced oxidation technology for wastewater treatment. At present, the development of high-performance catalysts for PMS activation has become a research hotspot. Herein, (Cu + decorated g-C 3 N 4 )/Bi 2 WO 6 ((Cu + /g-C 3 N 4 )/Bi 2 WO 6 ) composite was prepared successively by calcination and solvothermal method, which was used in visible light-assisted PMS activation for the degradation of rhodamine B (RhB). The construction of S-scheme heterojunctions between Cu + decorated g-C 3 N 4 and Bi 2 WO 6 facilitated the activation of PMS, leading to a RhB degradation ratio of 98.46 % within 50 min. The corresponding reaction kinetic was significantly improved by a factor of 2.32 and 7.94 compared with that of CCN and BWO, respectively. The enhanced performance of the (Cu + /g-C 3 N 4 )/Bi 2 WO 6 can be attributed to the successful construction of S-scheme heterojunction, which facilitates the separation of photogenerated carriers and accelerates the PMS activation to produce abundant active species. Furthermore, the (Cu + /g-C 3 N 4 )/Bi 2 WO 6 composites exhibit strong stability and reusability following three cycles. In addition, the intermediates produced during the RhB degradation process were investigated by liquid chromatograph mass spectrometer (LC-MS). This study provides a new insight into the preparation of S-scheme photocatalysts for the photocatalytic-PMS activation system that will achieve efficient removal of dyes from wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Mo Qiu,Ruoqing Wang,Xinhua Qi
This paper reports a method of controllable synthesis of hollow polyhedral α-Fe 2 O 3 using H 3 btc and HF as additives. Three products with different morphologies were obtained by only adjusting the ratio of H 3 btc: HF. The as-prepared products were characterized using XRD, TG-DSC, FT-IR, Zeta potential analysis, UV, SEM and TEM. The characterization results reveal that H 3 btc is the key factor in preparing a hollow structure, and HF is vital to form a polyhedral morphology. On the basis of the time-dependent experiments, a probable growth mechanism of α-Fe 2 O 3 was proposed. Finally, the resulting hollow polyhedral α-Fe 2 O 3 exhibit good photocatalytic degradative ability for rhodamine B (RhB) molecules in water under visible light irradiation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Yue Zhang,Gang Li,Qiuyu Guo
A series of composites based on Fe-based MOF (Fe-BDC) and CdSe quantum dots (CdSe QDs) have been synthesized with CdSe QDs well-embedded into Fe-BDC particles, which are characterized by XRD , SEM, TEM, ICP-OES, FT-IR, N 2 physical sorption , UV–visible DRS , PL and electrochemical measurements. By detecting the degradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation, the photocatalytic performance of CdSe@Fe-BDC nanocomposites were apparently improved by 5.8 times relative to single Fe-BDC, which can be attributed to the heterostructure formed in CdSe@Fe-BDC. Owing to the perfect interfacial contact, this promotes electron transfer from CdSe to Fe-BDC and significantly facilitates the separation of the photogenerated electron-hole pairs. The photocatalytic mechanism studied by adding sacrificial agents revealed that the predominant active species in the system is hole cation (h + ) and oxygen free radicals (•O 2 − ).
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jinxiong Wu,Xiuling Yan,Li Li,Jiahua Gu,Ting Zhang,Lanlan Tian,Xintai Su,Zhang Lin
Coal gangue (CG) is one of the largest industrial solid wastes in the world produced during the process of coal mining . The accumulation of CG is easy to cause ion leakage , which is harmful to the environment and human body. The recovery and utilization of CG are imminent. In the process, a hierarchical porous carbon (HPC) adsorbent with excellent adsorption property for Cr(VI) and rhodamine B (RhB), was prepared from CG by a two-step method and characterized by SEM, TEM, XRD , XPS, TPD and BET. The results revealed that the specific surface area of HPC is up to 2012.7 m 2 g −1 , and its adsorption capacities for Cr(VI) and RhB are reached 320.51 and 3086.42 mg g −1 . The adsorption mechanism of RhB was the synergetic effect of physics and chemistry. While XPS results suggested that hierarchical porous carbons (HPCs) only have a chemisorption effect on Cr(VI). This study provided an idea for the preparation of HPCs from CG to remove inorganic and organic pollutants such as heavy metal Cr(VI) and RhB in water.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
MATERIALS & DESIGN
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2017
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IF 4.364
Xiao Du,Jun Wan,Jia Jia,Chao Pan,Xiaoyun Hu,Jun Fan,Enzhou Liu
Ag 3 PO 4 -Bi 2 MoO 6 heterojunctions with visible-light photocatalytic activity were successfully fabricated via a deposition-precipitation method. The investigation shows that Ag 3 PO 4 -Bi 2 MoO 6 composites exhibit enhanced visible light harvesting ability and better degradation efficiency for RhB compared with Bi 2 MoO 6 and Ag 3 PO 4 under visible light irradiation (λ > 420 nm). What's more, we found that the activity and the stability of Ag 3 PO 4 -Bi 2 MoO 6 heterojunction could be further improved by adding of H 2 O 2 in the RhB reaction solution. The enhanced photocatalytic performance and structure stability are primarily attributed to the efficient charge carrier separation of the heterojunction formed by Ag 3 PO 4 and Bi 2 MoO 6 , and the electron capturing property of H 2 O 2 on the surface of Ag 3 PO 4 -Bi 2 MoO 6 composites, leading to a highly efficient removal of RhB using the Ag 3 PO 4 -Bi 2 MoO 6 -H 2 O 2 system. In addition, the active species trapping experiments indicate that h + and •O 2 – play important roles during the photocatalytic degradation process . This work suggests that the H 2 O 2 assisted Ag 3 PO 4 -Bi 2 MoO 6 heterojunction system could be a potential promising photocatalyst for environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 10
·5508-5520
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IF 2.047
Wang Yan,Zheng Zhanshen,Li Yuanliang,Jia Pengwei,Liu Tong
Degradation of harmful pollutants is the key to water pollution control. Herein, a series of BiOI/g-C 3 N 4 -Ag 2 O (BCNA) heterojunction photocatalysts were prepared by a simple liquid-phase synthesis method for photocatalytic degradation of organic pollutants under visible light. The crystal structure, morphology, and elemental composition of the synthesized photocatalysts were characterized by x-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and x-ray photoelectron spectroscopy (XPS). The experimental results showed that compared with g-C 3 N 4 and BiOI, BiOI/g-C 3 N 4 -Ag 2 O composite showed the best photocatalytic activity when the Ag 2 O loading was 14.68 wt.%, and the removal rate of rhodamine B (RhB) could reach 98% after 30 min, and the photodegradation showed good stability through the cycle tests. In addition, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence excitation spectrum (PL), and photoelectrochemical measurements confirmed that the enhanced photoactivity of BiOI/ g-C 3 N 4 -Ag 2 O is due to the formation of ternary heterojunction, which not only amplifies the visible light response of g-C 3 N 4 but also improves the separation and migration rate of photoinduced carriers. Finally, a possible mechanism of charge separation and transfer for ternary heterojunction photocatalysts was proposed. This study extends the application range of g-C 3 N 4 for RhB degradation and provided a new opportunity for environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
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IF 3.9
Bayrammyrat Ovezmyradov,Guijun Yang,Yuanyuan Wang,Hui Nan,Caihong Xue,Huiyuan Chen
In order to solve the pollution problem of organic pollutants in water, this study proposed a photocatalyst that efficiently utilizes sunlight, and TiO 2 /HTiOF 3 photocatalytic materials were successfully prepared by a hydrothermal method and used for the degradation of rhodamine B (RhB) solution under simulated sunlight. The effect of time and urea addition on the performance of the material was investigated, and the results showed that the sample with a reaction time of 12 h and a urea addition of 0.05 g exhibited 97 % degradation efficiency and the best photocatalytic degradation activity for RhB solution, which was attributed to the construction of a traditional type II heterojunction of the TiO 2 /HTiOF 3 nanocomposite, which improved the carrier separation rate and maintained a strong redox capacity. This work contributes to the construction of efficient semiconductor photocatalytic nano-heterostructures. The preparation of TiO 2 /HTiOF 3 composites by one-step hydrothermal method provides a new idea for the development of catalysts.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2013
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IF 2.112
Yongqian Lei,Guanhua Wang,Pengran Guo,Huacan Song
A series of Ag-loaded photocatalysts of Ag–BiOBr x I 1− x have been synthesized by a solution method and characterized by variety methods. The degradation of rhodamine B (RhB) showed that these samples exhibited excellent and composition-dependent performance in the visible light region. The Ag–BiOBr 0.75 I 0.25 composite photocatalyst shows the highest photocatalytic activity in the degradation of RhB and 4-CP pollution. The load of metal Ag has remarkably improved the photocatalytic activity. The significant enhancement in the Ag–BiOXs photoactivity could be both the effect of Ag deposits as electron traps and the surface plasma resonance absorption effect of Ag. A possible mechanism of enhanced activity of Ag–BiOXs was proposed based on the analysis of the band gap structure.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 5
·055502
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IF 1.068
Shaofeng Zhang,Jinggang Hao,Feng Ren,Wei Wu,Xiangheng Xiao
Combination of semiconductors with plasmonic nanostructures is an effective route to promote the solar light harvesting as well as the efficiency of photocatalysis. In the present work, the Au@SnO2 hybrid nanostructures with Au nanorods as the cores and highly crystallized SnO2 nanoparticles as the shells were fabricated by a facile hydrothermal method. A critical factor, which influences the coating state of the SnO2 shells over Au NRs, was found to be the concentration of CTAB agent in the system and the corresponding mechanism was also proposed. The photocatalytic activities of the Au@SnO2 nanohybrids were examined by degradation of rhodamine B (RhB) dyes at room temperature. The Au@SnO2 nanohybrids exhibited much higher catalytic activities than that of the commercial SnO2 NPs, which could be attributed to the localized electric field enhancement effect of Au nanorods plasmon and charges transfer between the Au nanorods and SnO2.
研究领域:
材料科学
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纳米技术
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光催化
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2018
·Vol. 20
·期 10
·6959-6969
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IF 3.906
Fengzhi Wang,Yusong Zhou,Xinhua Pan,Bin Lu,Jingyun Huang,Zhizhen Ye
A series of ZnO nanorod (NR)-reduced graphene oxide (rGO) nanocomposites (NCs) (i.e., ZnO–rGO NCs) with varying rGO loadings were fabricated by electrostatic self-assembly of positively charged ZnO NRs with negatively charged graphene oxide (GO), followed by the hydrothermal reduction of GO to rGO. When compared with bare ZnO NRs, ZnO-5% rGO exhibited significant photoactivity 6 times higher in the photodegradation of rhodamine B (RhB), and 2 times higher than ZnO-5% rGO(H) synthesized by hard integration of GO and ZnO NRs. In the same manner, ZnO-5% rGO exhibited a significant photoactivity 3 times higher in photodegrading phenol, which is 2 times higher than ZnO-5% rGO(H). Furthermore, the adsorption properties of ZnO–rGO NCs towards RhB and phenol were significantly different as a result of the opposite charges of the two pollutants in aqueous solution, which also led to the formation of different key free radicals during the degradation reaction. Based on various characterization techniques, it is concluded that the enhanced photoactivity and photostability of ZnO-5% rGO originated from the synergistic effects between ZnO NRs and rGO nanosheets including higher specific surface area, enhanced photogenerated carrier separation, and strengthened protection effects from intimate rGO coupling. However, these synergistic effects were weaker in ZnO-5% rGO(H) which reflects the key importance of surface charge modification in producing a well-contacted interface.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 21
·8228-8236
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IF 3.829
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Xiangheng Xiao,Lingling Sun,Ying Liu,Changzhong Jiang
Composite materials containing different components with well-defined structures may cooperatively enhance their performance and extend their applications. In this work, core–shell γ-Fe2O3@SnO2 hollow nanoparticles (NPs) were synthesized by a low-cost and environmentally friendly seed-mediated hydrothermal method. Firstly, the γ-Fe2O3 hollow NPs were synthesized by a template-free method. Then they were used as the cores for the growth of SnO2 shells. The thickness of the shell can be simply tailored by controlling the reaction time. Various techniques, including SEM, XRD, TEM and HRTEM, were employed to investigate the morphology, structure and formation process of the special core–shell hollow structures. The combination of magnetic semiconductor (γ-Fe2O3) and wide band-gap semiconductor (SnO2) endowed them with great potential to be used as recyclable photocatalysts. Experiments on photo-degradation of Rhodamin B (RhB) dye in the presence of the samples showed that the hybrid structures possessed higher photocatalytic activities than the monomer structures of SnO2 and γ-Fe2O3 materials indicating a strong coupling enhancement effect between the wide and narrow band-gap semiconductors. Moreover, the gas sensing tests of the γ-Fe2O3@SnO2 hollow NPs revealed that the samples exhibited fast response and recovery rates, which enable them to be promising materials for gas sensors.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
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IF 3.9
Congzhi Hu,Yuye Li,Tingting Du,Youyong Pang,Yongping Liu,Botian Liu,Ling Li,Huidan Lu,Bin Huang
In this paper, a new supramolecular Z-scheme heterojunction photocatalyst, designated as Ag/Ag 3 PO 4 /Perylene diimide organic molecules after secondary acid-base self-assembly (PDI-2), was synthesized through precipitation and photoreduction techniques. Ag/Ag 3 PO 4 /60 %PDI-2 (APP-6) exhibited the best photocatalytic activity due to the synergistic effect of Z-scheme heterojunction and surface plasmon resonance (SPR) effect of Ag nanoparticles (Ag NPs). Under visible light (λ > 420 nm), the degradation efficiency of APP-6 for Rhodamine B (RhB) and Bisphenol A (BPA) was 99.7 % and 90.7 %, respectively. Additionally, PDI-2 was transformed into smaller nanoclusters, which increased the specific surface area of the photocatalyst, and reduced the charge transport distance. Moreover, APP-6 exhibited the smallest electrochemical impedance, the largest photocurrent, the smallest fluorescence lifetime. Free radical trapping experiments showed that •O 2 − was the main reactive group and a possible photocatalytic mechanism was proposed by combining the Ultraviolet–visible diffuse reflectance spectrophotometer (UV–vis DRS) and the Mott-Schottky plots.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
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