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流化床光催化臭氧氧化苯酚动力学模型 被引量:1
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作者 董双石 周丹丹 +2 位作者 任南琪 张静仁 于丽丽 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2010年第10期1581-1585,1595,共6页
为了检验O3对光催化氧化苯酚效率提高能力,采用试验与数学模型联合方法量化O3的贡献.以球形活性炭(AC)作为载体,采用溶胶-凝胶法制作负载型二氧化钛光催化剂(TiO2-AC).原始活性炭与催化剂对苯酚的等温吸附研究表明,两种颗粒的吸附是可逆... 为了检验O3对光催化氧化苯酚效率提高能力,采用试验与数学模型联合方法量化O3的贡献.以球形活性炭(AC)作为载体,采用溶胶-凝胶法制作负载型二氧化钛光催化剂(TiO2-AC).原始活性炭与催化剂对苯酚的等温吸附研究表明,两种颗粒的吸附是可逆的,并且在稀溶液条件下符合Freundlich方程.在流化床中分别采用O3、UV/O3、UV/O3/AC、TiO2-AC/UV/O2和TiO2-AC/UV/O3等5种工艺对苯酚的氧化效率进行了对比,发现液相臭氧氧化、多相臭氧氧化与多相光催化的综合作用导致光催化臭氧氧化效率比光臭氧氧化高34.5%.建立了流化床中多相光臭氧氧化与多相光催化臭氧氧化苯酚动力学模型.模型结果表明,溶液中臭氧质量浓度为0.02mg/L时,二氧化钛光催化氧化苯酚速度提高了14.8倍,在光催化氧化有机物过程中,臭氧比氧更适合作为电子的捕获剂. 展开更多
关键词 氧化 光臭氧氧化 催化臭氧氧化 苯酚 流化床
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UV/O3-BAC与O3-BAC处理二级出水中有机污染物的研究 被引量:8
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作者 李来胜 祝万鹏 +1 位作者 张彭义 张秋云 《水处理技术》 CAS CSCD 北大核心 2008年第1期22-25,58,共5页
将光助臭氧氧化-生物活性炭(UV/O3-BAC)新型组合工艺用于处理城市污水厂二级出水中有机污染物。考察了臭氧剂量、氧化反应时间和生物活性炭停留时间对出水水质影响,TOC去除率随着臭氧剂量、氧化反应时间和生物活性炭停留时间增加而增加... 将光助臭氧氧化-生物活性炭(UV/O3-BAC)新型组合工艺用于处理城市污水厂二级出水中有机污染物。考察了臭氧剂量、氧化反应时间和生物活性炭停留时间对出水水质影响,TOC去除率随着臭氧剂量、氧化反应时间和生物活性炭停留时间增加而增加;其优化工艺参数为:臭氧剂量为3 mg/L,氧化反应和生物活性炭空塔停留时间均为15 min。在优化工艺参数下,UV/O3-BAC工艺对TOC和UV254平均去除率分别达到46%和71%,比O3-BAC工艺(同样工艺参数下)对TOC和UV254平均去除率分别提高35.3%和14.5%;两组合工艺对有机物去除具有协同效应,其中UV/O3-BAC工艺的协同效应比O3-BAC工艺大。UV/O3和O3过程将水中大分子有机物氧化成小分子,增加了出水的可生化性,从而有利于后续BAC对有机污染物的去除。二级出水中主要有机污染物是酚类和酞酸酯等,经氧化处理后,二级出水中芳香烃和含-C=C-有机物消失或浓度减少,同时也生成一些小分子氧化产物,但经BAC处理后,污染物种类和浓度均大为减少。 展开更多
关键词 二级出水 臭氧氧化 生物活性炭 可生化性(BDOC/DOC) UV254 TOC
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Synergetic effect between non-thermal plasma and photocatalytic oxidation on the degradation of gas-phase toluene: Role of ozone 被引量:7
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作者 Haoling Ye Yiqiu Liu +3 位作者 Si Chen Haiqiang Wang Zhen Liu Zhongbiao Wu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第5期681-690,共10页
In this study, a hybrid process using non‐thermal plasma (NTP) and photocatalytic oxidation (PCO) was adopted for the degradation of gas‐phase toluene using TiO2 as the photocatalyst. To discover the synergetic effe... In this study, a hybrid process using non‐thermal plasma (NTP) and photocatalytic oxidation (PCO) was adopted for the degradation of gas‐phase toluene using TiO2 as the photocatalyst. To discover the synergetic effect between NTP and PCO, the performances of both sole (O3, UV, NTP, and PCO) and combined (O3 + TiO2, O3 + UV, NTP + UV, O3 + PCO, and NTP + PCO) processes were investigated from different perspectives, such as the toluene removal efficiency, selectivity of COx, mineralization rate, ozone utilization, and the generation of by‐products. The toluene removal efficiency of the combined NTP + PCO process was 80.2%, which was much higher than that of a sole degradation process such as NTP (18.8%) and PCO (13.4%). The selectivity of CO2 and the ozone utilization efficiency also significantly improved. The amount of by‐products in the gas phase and the carbon‐ based intermediates adsorbed on the catalyst surface dramatically reduced. The improvement in the overall performances of the combined NTP + PCO process was mainly ascribed to the efficient utilization of ozone in the photocatalytic oxidation, and the ozone further acting as an electron acceptor and scavenger, generating more hydroxyl radicals and reducing the recombination of electron‐ hole pairs. 展开更多
关键词 Non‐thermal plasma Photocatalytic oxidation Synergetic effect OZONE TOLUENE
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Transforming bilayer MoS2 into single-layer with strong photoluminescence using UV-ozone oxidation 被引量:3
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作者 Weitao Su Naresh Komar +2 位作者 Steve J. Spencer Ning Dai Debdulal Roy 《Nano Research》 SCIE EI CAS CSCD 2015年第12期3878-3886,共9页
The use of single-layer MoS2 in light emitting devices requires innovative methods to enhance its low photoluminescence (PL) quantum yield. In this work, we report that single-layer MoS2 with a strong PL can be prep... The use of single-layer MoS2 in light emitting devices requires innovative methods to enhance its low photoluminescence (PL) quantum yield. In this work, we report that single-layer MoS2 with a strong PL can be prepared by oxidizing bilayer MoS2 using W-ozone oxidation. We show that as compared to mechanically-exfoliated single-layer MoS2, the PL intensity of the single-layer MoS2 prepared by W-ozone oxidation is enhanced by 20-30 times. We demonstrate that the PL intensity of both neutral excitons and trions (charged excitons) can be greatly enhanced in the oxidized MoS2 samples. These results provide novel insights into the PL enhancement of single-layer MoS2. 展开更多
关键词 single-layer MoS2 W-ozone oxidation photoluminescence enhancement tip-enhanced Raman spectroscopy
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