【摘 要】
：
Coagulation followed by sedimentation,as a conventional technique in the water treatment plant,can be the first line of defense against exposures of carbon nano
【机 构】
：
Department of Environmental Science,Zhejiang Provincial Key Laboratory of Organic Pollution Process
【基金项目】
：
the Zhejiang Provincial \"Qianjiang Talent Program\";国家自然科学基金;the National Basic Research Program (973) of China;Zhejiang Provincial Innovative Research Team of Water Treatment Functional Material
论文部分内容阅读
Coagulation followed by sedimentation,as a conventional technique in the water treatment plant,can be the first line of defense against exposures of carbon nanotubes(CNTs)to aquatic organisms and human beings,which has been rarely documented.This study investigated the removal of dispersant-stabilized CNT suspensions by poly aluminum chloride(PAC1)and KAI(SO4)2·12H2O (alum),with a focus on the effects of dispersant type,coagulant type and dosage.PAC1 performed better than alum in the removal of tannic acid-,humic acid-,and sodium dodecyl benzenesulfonate-stabilized CNTs,but worse for polyethylene glycol octylphenyl ether(TX100)-stabilized CNTs.Neither coagulant could effectively precipitate cetyltrimethyl ammonium bromide-stabilized CNTs.The removal by PAC1 first increased up to a plateau and then decreased with the continued increase of coagulant dosage.However,the removal rates leveled off but did not decrease after achieving their highest level with the continued addition of alum.The coagulation and flocculation of the CNT suspensions by PAC1 could be regulated mainly by the mechanism of adsorption charge neutralization,whereas the coagulation by alum mainly involved electrical double-layer compression.
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