期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 604, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125285
关键词
Simultaneous adsorption; Octylamine; Vermiculite; Cadmium removal; Lead removal
资金
- National Key Research and Development Program of China [2017YFD0801004]
- National Natural Science Foundation of China [41972037, 41673092]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019B1515120015]
- Guangdong Science and Technology Program [2020B121201003]
- Guangdong Special Support Program for Local Innovative and Research Teams Project [2019BT02L218]
- Guangdong Special Support Program for Millions of Leading Engineering Talents [201626011]
Cadmium (Cd) and lead (Pb) have been remained the topic of investigation for various research studies because of their adverse effects on human health, furthermore, they have toxic and non-biodegradable properties. In this study, vermiculite (VER) was functionalized with octylamine (OCT) to obtain a novel organoclay (OCT-VER) for enhanced simultaneous adsorption of Cd(II) and Pb(II) from aqueous solution. Adsorbents were characterized and parameters influencing on adsorption were also investigated. The adsorption of Cd(II) and Pb(II) by OCT-VER was monolayer and homogenous which was described well by Langmuir isotherm model. After modification, the affinities of OCT-VER towards both metal ions were enhanced. In single system, maximum adsorption capacities for Cd(II) and Pb(II) were improved from 45.245 and 102.289 mg.g(-1) to 69.595 and 184.603 mg.g(-1) while in binary system from 37.539 and 78.265 mg.g(-1) to 61.630 and 121.986 mg.g(-1), respectively. In adsorbent regeneration experiment of OCT-VER, the removal ratio was found approximate to 90 % even after 5 consecutive cycles, exhibiting good stability and easy regeneration potential. After studying thoroughly, ion-exchange and complexation properties were the main reaction mechanism. These findings suggested that the proposed low cost adsorbent was suitable and promising material for Cd(II) and Pb(II) adsorption in water.
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