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Microwave thermal remediation of crude oil contaminated soil enhanced by carbon fiber

Journal of environmental sciences 2009年第9期21卷 1290-1295页

作者： li dawei,zhang yaobin,quan xie,zhao yazhi key laboratory of industrial ecology and environmental engineering,ministry of education of china,school of environmental and biological science and technology,dalian university of technology,dalian 116024,china [a]key laboratory of industrial ecology and environmental engineering Ministry of Education of China School of Environmental and Biological Science and Technology Dalian University of Technology Dalian 116024 China

Thermal remediation of the soil contaminated with crude oil using microwave heating enhanced by carbon fiber （CF） was explored. The contaminated soil was treated with 2.45 GHz microwave, and CF was added to improve the conversion of microwave energy into thermal energy to heat the soil. During microwave heating, the oil contaminant was removed from the soil matrix and recovered by a condensation system of ice-salt bath. The experimental results indicated that CF could efficiently enhance the microwave heating of soil even with relatively low-dose. With 0.1 wt.% CF, the soil could be heated to approximately 700℃ within 4 min using 800 W of microwave irradiation. Correspondingly, the contaminated soil could be highly cleaned up in a short time. Investigation of oil recovery showed that, during the remediation process, oil contaminant in the soil could be efficiently recovered without causing significant secondary pollution.

关键词： microwave heating crude oil remediation carbon fiber

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Effects of Cu(Ⅱ) and humic acid on atrazine photodegradation

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Journal of environmental sciences 2011年第5期23卷 773-777页

作者： Xia Sun Hui liu yaobin zhang yazhi zhao xie quan key laboratory of industrial ecology and environmental engineering Ministry of Education Department of Environmental Science and Technology Dalian University of Technology Dalian 116024 China. E-mail: zhangyb@***

This work was designed to explore the characteristics of photodegradation of herbicides in the copper-polluted water body. The results showed that Cu（Ⅱ） alone could induce a photo Fenton-like reaction to enhance the degradation of atrazine, in which hydroxyl radical （.OH） was a main active species. Humic acids restrained atrazine degradation, nevertheless, when introducing Cu（Ⅱ）, the photodegradation was accelerated, in which singlet oxygen （102） replaced -OH acting as the prevailing species. A feasible mechanism for the photochemical process was also proposed, which is helpful for better understanding the environmental photochemistry of atrazine in the copper-polluted water.

关键词： humic acids Cu(Ⅱ) photodegradation hydroxyl radical singlet oxygen

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Contribution of black carbon to nonlinearity of sorption and desorption of acetochlor on sediment

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Frontiers of environmental science & engineering 2009年第1期3卷 69-74页

作者： Jianqiu liU yaobin zhang Hong CHEN yazhi zhao xie quan key laboratory of industrial ecology and environmental engineering Ministry of EducationSchool of Environmental and Biological Science and TechnologyDalian University of TechnologyDalian 116023China

In order to investigate the contribution of various black carbon(BC)contents to nonlinearity of sorption and desorption isotherms for acetochlor on sediment,equilibrium sorption and desorption isotherms were determined to measure sorption and desorption of acetochlor in sediment amended with various amounts of *** this paper,two types of BC referred to as BC400 and BC500 were prepared at 400℃ and 500℃,*** preparation temperature facilitated the formation of micropores on BC to enhance its sorption *** of the BC content obviously increased the sorption amount and reduced the desorption amount for *** the BC500 contents in total organic carbon(TOC)increased from 0 to 60%,Freundlich sorption coefficient(K_(f))increased from 4.07 to 35.74,and desorption hysteresis became gradually *** the content of BC in TOC was lower than 23%,the sorption isotherm had a significant linear correlation(p=0.05).In case of desorption,a significant nonlinear change could be observed when the content of BC was up to 13%.Increase of BC content in the sediment would result in shifting the sorption-desorption isotherms from linearity to nonlinearity,which indicated that contribution of BC to nonlinear adsorption fraction became gradually remarkable.

关键词： black carbon(BC) sorption desorption sediment

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Electrochemically enhanced adsorption of PFOA and PFOS on multiwalled carbon nanotubes in continuous flow mode

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Chinese science Bulletin 2014年第23期59卷 2890-2897页

作者： Shuangyu Wang Xiaona li yaobin zhang xie quan Shuo Chen Hongtao Yu Huimin zhao key laboratory of industrial ecology and environmental engineering (MOE) School of Environmental Science and TechnologyDalian University of Technology

It is important to develop efficient technologies on removal of perfluorooctanoic acid(PFOA)and perfluorooctane sulfonate(PFOS)from water due to their wide distribution and potential threat to human *** this work,a durable and convenient electrosorption device was designed in continuous flow mode to investigate the adsorption of PFOX(X=A and S)on multiwalled carbon nanotubes(MWNTs)from water under electrochemical *** electrosorption experiments were conducted under different influent and electrolyte concentrations,hydraulic retention time(HRT)and electrode distance to optimize the *** results showed that the highest removal efficiencies toward both PFOA and PFOS could come up to 90%at 1 *** with open circuit(OC)adsorption under the same conditions,the removal efficiencies were improved by 4.9 times(PFOA)and 4.2 times(PFOS)*** addition,the MWNTs electrode was found to be *** findings provide an efficient method to remove PFOX from water by electrosorption in continuous flow mode.

关键词：多壁碳纳米管电化学吸附 PFOS PFOA 水力停留时间流模式碳纳米管电极电解质浓度

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