共查询到20条相似文献,搜索用时 296 毫秒
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Xiaoge Wu Lei Yan Rongrong Qin Qikai Zhang Wei Yang Xiaozhi Wang Yongcai Zhang Min Luo Jianhua Hou 《环境科学学报(英文版)》2024,(4):418-427
Bi2O2CO3(BOC)/Bi4O5Br2(BOB)/reduced graphene oxide (rGO) Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature method.Ultra-thin nanosheets of BOC and BOB were grown in situ on r GO.The formed 2D/2D direct Z-scheme heterojunction of BOC/BOB with oxygen vacancies (OVs) effectively leads to lower negative electron reduction potential of BOB as well as higher positive h... 相似文献
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Khoirakpam Kesho Singh Kula Kamal Senapati Chandan Borgohain Kanak Chandra Sarma 《环境科学学报(英文版)》2017,29(2):333-340
Chlorophenols, typically 4-chlorophenols are highly toxic and non-biodegradable organic contaminants which pose serious threat to the environment, particularly when released into aqueous medium. The removal of these pollutants by efficient method has received worldwide concern in recent past. A new Fe_3O_4–Cr_2O_3 magnetic nanocomposite was synthesized by wet chemical method under ultrasonic irradiation. Microstructure and morphology of the nanocomposite were characterized by powder X-ray diffraction(XRD),Fourier transform infrared(FT-IR), and a transmission electron microscope(TEM). Magnetic and optical properties were studied by a vibrating sample magnetometer(VSM) and an ultraviolet–visible(UV–Vis) spectrophotometer respectively. The magnetic nanocomposite(MNC) was used as photocatalyst for effective decomposition of 4-chlorophenol in water under ultraviolet(UV) irradiation. 相似文献
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Yangfan Yuan Changai Zhang Chenhao Zhao Bing Wang Xiaozhi Wang Bin Gao Shengsen Wang J?rg Rinklebe 《环境科学学报(英文版)》2023,35(3):26-36
Herein,a one-step co-pyrolysis protocol was adopted for the first time to prepare a novel pyrogenic carbon-Cu0/Fe3O4 heteroatoms (FCBC) in CO2 ambiance to discern the roles of each component in PDS activation.During co-pyrolysis,CO2 catalyzed formation of reducing gases by biomass which facilitated reductive transformation of Fe3+ and Cu2+ to Cu0 and Fe3O4,respectively.According to the a... 相似文献
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Jia Wang Yuxi Liu Jiguang Deng Lin Jing Xiuqing Hao Xing Zhang Xiaohui Yu Hongxing Dai 《环境科学学报(英文版)》2024,(4):153-166
The PdPtVOx/CeO2-ZrO2(PdPtVOx/CZO) catalysts were obtained by using different approaches,and their physical and chemical properties were determined by various techniques.Catalytic activities of these materials in the presence of H2O or SO2were evaluated for the oxidation of ethylbenzene (EB).The PdPtVOx/CZO sample exhibited high catalytic activity,good hydrothermal stability,and reversible sulfur dioxide-poisoning perfo... 相似文献
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Compressed natural gas(CNG)is most appropriate an alternative of conventional fuel for automobiles.However,emissions of carbon-monoxide and methane from such vehicles adversely affect human health and environment.Consequently,to abate emissions from CNG vehicles,development of highly efficient and inexpensive catalysts is necessary.Thus,the present work attempts to scan the effects of precipitants(Na_2CO_3,KOH and urea)for nickel cobaltite(Ni Co_2O_4)catalysts prepared by co-precipitation from nitrate solutions and calcined in a lean CO-air mixture at 400°C.The catalysts were used for oxidation of a mixture of CO and CH_4(1:1).The catalysts were characterized by X-ray diffractometer,Brunauer–Emmett–Teller surface-area,X-ray photoelectron spectroscopy;temperature programmedreductionandScanningelectronmicroscopycoupledwith Energy-Dispersive X-Ray Spectroscopy.The Na_2CO_3was adjudged as the best precipitant for production of catalyst,which completely oxidized CO-CH_4mixture at the lowest temperature(T_(100)=350°C).Whereas,for catalyst prepared using urea,T_(100)=362°C.On the other hand the conversion of CO-CH_4mixture over the catalyst synthesized by KOH limited to 97%even beyond 400°C.Further,the effect of higher calcination temperatures of 500 and600°C was examined for the best catalyst.The total oxidation of the mixture was attained at higher temperatures of 375 and 410°C over catalysts calcined at 500 and 600°C respectively.Thus,the best precipitant established was Na_2CO_3and the optimum calcination temperature of 400°C was found to synthesize the Ni Co_2O_4catalyst for the best performance in CO-CH_4oxidation. 相似文献
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Weilong Ouyang Yi Zhou Xiaoqi Fei Yarong Bai Haiqiang Wang Zhongbiao Wu 《环境科学学报(英文版)》2022,34(1):175-184
Herein, a series of niobium oxide supported cerium nanotubes(Ce NTs) catalysts with different loading amount of Nb2O5(0–10 wt.%) were prepared and used for selective catalytic reduction of NOxwith NH3(NH3-SCR) in the presence of CH2Cl2. Commercial V2O5-WO3-TiO2 catalyst was also prepared for comparison. The physcial properties and chemical properties of the Nb2O5 lo... 相似文献
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Ze Wang Zhi Huang Jiang Yu Xiao Shao Weidong Peng Jie Yu Yinying Jiang 《环境科学学报(英文版)》2024,(3):432-442
Formaldehyde is a pollutant that significantly affects the indoor air quality.However,conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor environment.In this study,Photocatalysts of Ag/graphitic carbon nitride (g-C3N4)/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition,using nickel foam (NF) as the carrier.Experiments demonstrated that when the Ag concen... 相似文献
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Yaodong Guo Zhaoying Di Xiaonan Guo Ying Wei Runduo Zhang Jingbo Jia 《环境科学学报(英文版)》2023,35(3):135-147
Pt catalysts with nitrogen-doped graphene oxide (GO) as support and CeO2 as promoter were prepared by impregnation method,and their catalytic oxidation of formaldehyde (HCHO) at room temperature was tested.The Pt-CeO2/N-rGO (reduced GO) with a mass fraction of 0.7% Pt and 0.8%CeO2 exhibited an excellent catalytic performance with the 100% conversion of HCHO at room temperature.Physicochemical characterization demonstrated that nitrogendoping greatly increased the... 相似文献
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In the quest for the development of thermally stable, highly active and low-cost catalysts for use in catalyzed diesel particulate filter, nano-composites are new areas of research. Therefore, we reported the easy synthesis of spinel NiCo2O4/perovskite LaCoO3 nano-composite,and its individual oxides NiCo2O4and LaCoO3 for comparison. The detailed insights into the physio-chemical characteristics of formed NiCo2O4 相似文献
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Ruolin Cao Shiqing Liu Xinyu Yang Chunfeng Wang Yanbin Wang Wanfeng Wang Yunqing Pi 《环境科学学报(英文版)》2022,34(2):280-290
Although widely used in permeation reaction barrier(PRB) for strengthening the removal of various heavy metals, zero-valent iron(ZVI) is limited by various inherent drawbacks, such as easy passivation and poor electron transfer. As a solution, a synergistic system with PRB and electrokinetics(PRB-EK) was established and applied for the efficient removal of Cr(Ⅵ)-contaminated groundwater. As the filling material of PRB, ZVI/Fe3O4/activated carbon(ZVI/Fe3O4 相似文献
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G. Gattow 《Die Naturwissenschaften》1960,47(19):442-442
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采用纳米Fe3O4降解溶液中的2,4-D,考察了2,4-D初始浓度、纳米Fe3O4的投加量、溶液pH对2,4-D降解效率的影响,并探讨了2,4-D的降解机理。实验结果表明,Fe3O4对2,4-D有明显的降解作用,纳米Fe3O4的降解效果优于微米级Fe3O4,降解过程中溶液中的氯离子浓度随着2,4-D的降解而升高,Fe3O4对2,4-D的降解机理是还原脱氯。当2,4-D初始浓度在0~10mg/L、纳米Fe3O4投加量0~300mg/L的范围内,2,4-D降解率随初始浓度和纳米Fe3O4投加量的增加而增大。在2,4-D初始浓度为10mg/L、pH3.0、纳米Fe3O4投加量300mg/L时降解效率最高,48h内2,4-D的降解率可达40%。 相似文献
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5–MoO3/TiO2–CeO2 catalyst
The deposition of NH4HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts. In this work, deposited NH4HSO4 decomposition behavior and SO2 poisoning over V2O5–MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated. By the means of characterization analysis, it was found that the addition of SiO2 into VMo/Ti–Ce had an impact on the interaction existed between catalyst surface atoms and NH4HSO4. Temperature-programmed methods and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4HSO4 on VMo/Ti–Ce catalyst surface by reducing the thermal stability of NH4HSO4 and enhancing the NH4HSO4 reactivity with NO in low temperature. And this improvement may be the reason for the better catalytic activity than VMo/Ti–Ce in the case of NH4HSO4 deposition. Accompanied with cerium sulfate species generated over catalyst surface, the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst. The addition of SiO2 could promote the decomposition of cerium sulfate, which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 相似文献
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