排序方式: 共有78条查询结果,搜索用时 312 毫秒
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Min Li Shuai Liang Yang Wu Meiyue Yang Xia Huang 《Frontiers of Environmental Science & Engineering》2020,14(6):107
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Zhang Y Xiong X Han Y Zhang X Shen F Deng S Xiao H Yang X Yang G Peng H 《Chemosphere》2012,88(2):145-154
Photoelectrocatalytic (PEC) technology involved applying an electrical bias to a TiO2 film electrode, has been widely applied to the degradation of refractory organic pollutants, owing to its high degradation efficiency. This paper reviews recent developments in the PEC degradation of recalcitrant organic contaminants using a TiO2 film electrode. The preparation and application of various TiO2 film electrodes have been investigated, as well as the parameters that influence PEC activity such as the crystal structure, the film thickness and substrate material, the applied electrical bias, the solution pH and conductivity. The improvement of PEC activity by doping the TiO2 film electrode with metal and non-metal ions has been discussed. The mechanism and kinetics for the PEC degradation of organic pollutants have also been highlighted. 相似文献
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Polybrominated biphenyls have been widely used as flameretardants in textile and electronic industries, and additives in plastics. Over the past few decades, much attention has been given to polybrominated biphenyls in the environment and their effects on humans. In this paper, we studied on the degradation of 4,4′-dibromobiphenyl, a typical one of polybrominated biphenyls, through photoelectrocatalytic process with TiO2, Zr/TiO2 and Zr, N/TiO2 nanotube arrays. The results showed that the photoelectrocatalytic process was more efficient than photocatalytic and electrolytic process alone. The results exhibited that the photoelectrocatalytic efficiency was significantly affected by the properties of the catalysts and bias potential, and the highest photoelectrocatalytic degradation rate was achieved with Zr, N/TiO2 at 1 V and the order was Zr, N/TiO2 > Zr/TiO2 > TiO2. The mechanism was also discussed by detecting the changes of pH value, bromine anion, total organic carbon and intermediates during the process. 相似文献
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碳纳米管改性PVDF中空纤维超滤膜处理二级出水抗污染性能研究 总被引:6,自引:5,他引:1
采用碳纳米管改性PVDF中空纤维超滤膜以缓解膜污染.考察了CNTs的乙醇分散液浓度、CNTs尺寸和负载量对改性中空纤维膜的抗污染性能和改性膜内表面CNTs层稳定性的影响,分析了该改性膜对二级出水DOC、UV254的去除效果,并对改性膜出水的荧光特性进行了表征.结果表明,选用体积分数为50%的乙醇分散液、外径为30~50 nm碳纳米管、负载量为3 g·m-2时,制备的改性中空纤维膜CNTs层稳定,抗污染能力显著提高.与未改性膜相比,改性膜对二级出水DOC和UV254的去除率分别提高了37%和56%;且对二级出水中的腐殖类和蛋白质类物质去除能力明显增强. 相似文献
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Water treatment is the key to coping with the conflict between people’s increasing demand for water and the world-wide water shortage. Owing to their unique and tunable structural, physical, and chemical properties, carbon nanotubes (CNTs) have exhibited great potentials in water treatment. This review makes an attempt to provide an overview of potential solutions to various environmental challenges by using CNTs as adsorbents, catalysts or catalyst support, membranes, and electrodes. The merits of incorporating CNT to conventional water-treatment material are emphasized, and the remaining challenges are discussed. 相似文献
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碳纳米材料在环境中的转化 总被引:1,自引:0,他引:1
碳纳米材料主要包括富勒烯、碳纳米管和石墨烯.随着碳纳米材料的研究和应用范围不断扩大,其对环境的影响和在环境中的行为也逐渐受到关注,而在环境中的转化是环境行为的一个重要方面.首先,环境转化会改变碳纳米材料的性质,从而影响其它行为如聚集沉降和生态毒性.同时,作为一种以碳为骨架的材料,能否被自然界转化、从而进入碳循环是评价碳纳米材料长期环境影响的必要信息.因此,本文重点总结了碳纳米材料在自然环境条件和水处理条件下可能发生的生物或非生物转化,并分析影响碳纳米材料转化的因素,和转化过程对其环境行为的影响. 相似文献
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声基阵是进行目标测量和定位的重要装备,而声基阵的海底坐标测量有广泛的应用场合。给出了一种基于时延测量的海底声基阵大地坐标测量的方法。在该方法中,声源在3个位置已知点上发射CW脉冲,利用声源发射和声阵接收的CW脉冲之间的时延获得空间中的3个声源发射点到阵元的距离,并以这3个声源发射点为圆心,以声源发射点到阵元的距离为半径作球面,得到的交点即为阵元的大地坐标。通过海上试验数据分析结果表明可以把该方法运用于实际的工程测量当中。 相似文献
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Enhanced photocatalytic activity of nanotube-like titania by sulfuric acid treatment 总被引:2,自引:0,他引:2
YANG Shao-gui QUAN Xie LI Xin-yong FANG Ning ZHANG Ning ZHAO Hui-min 《环境科学学报(英文版)》2005,17(2):290-293
IntroductionTiO2 nanotubehaswidelydrawnmuchattentionduetoitslargesurfaceareaandhighphotocatalyticactivity ,becausetheyhavegreatpotentialforsuchapplicationsasenvironmentalpurification ,decompositionofcarbonicacidgas,andgenerationofhydrogengas .Titaniananot… 相似文献