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您的检索式：作者名="Jingchun Mao"
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| 1 | Effect of AlCl_3 concentration on nanoparticle removal by coagulation显示文摘In recent years,engineered nanoparticles,as a new group of contaminants emerging in natural water,have been given more attention AlCl_3 In order to understand the behavior of nanoparticles in the conventional water treatment process,three kinds of nanoparticle suspensions,namely multi-walled carbon nanotube-humic acid(MWCNT-HA),multiwalled carbon nanotube-N,N-dimethylformamide(MWCNT-DMF) and nano TiO_2-humic acid(TiO_2-HA) were employed to investigate their coagulation removal efficiencies with varying aluminum chloride(AlCl_3) concentrations AlCl_3 Results showed that nanoparticle removal rate curves had a reverse 'U' shape with increasing concentration of aluminum ion(Al^(3+) )AlCl_3 More than 90% of nanoparticles could be effectively removed by an appropriate Al^(3+) concentration AlCl_3 At higher Al^(3+) concentration,nanoparticles would be restabilized AlCl_3 The hydrodynamic particle size of nanoparticles was found to be the crucial factor influencing the effective concentration range(ECR) of Al^(3+) for nanoparticle removal AlCl_3 The ECR of Al^(3+) followed the order MWCNT-DMF > MWCNT-HA > TiO_2-HA,which is the reverse of the nanoparticle size trend AlCl_3 At a given concentration,smaller nanoparticles carry more surface charges,and thus consume more coagulants for neutralization AlCl_3 Therefore,over-saturation occurred at relatively higher Al^(3+) concentration and a wider ECR was obtained AlCl_3 The ECR became broader with increasing p H because of the smaller hydrodynamic particle size of nanoparticles at higher p H values AlCl_3 A high ionic strength of Na Cl can also widen the ECR due to its strong potential to compress the electric double layer AlCl_3 It was concluded that it is important to adjust the dose of Al^(3+) in the ECR for nanoparticle removal in water treatment. | Lizhu Zhang Jingchun Mao Qing Zhao Shaobo He Jun Ma | 2015 | Journal of Environmental Sciences2015，27，12： | 6 |
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