Carboxymethylcellulose-chitosan film modified magnetic alkaline Ca-bentonite for the efficient removal of Pb(II) and Cd(II) from aqueous solution.
In order to endow alkaline Ca-bentonite (ACB) with magnetic separation ability, simultaneously obtain better magnetic stability and stronger removal capacity of heavy metal cations; magnetic alkaline Ca-bentonite/carboxymethylcellulose-chitosan film (MACB/C-C) was prepared by organic modification of magnetic alkaline Ca-bentonite (MACB) using non-toxic carboxymethylcellulose and chitosan. Textural characterization results revealed that magnetic Fe3O4 nanoparticles were successfully immobilized on ACB and modified with C-C. The functionalized layer of C-C concurrently enhanced the stability of Fe3O4 and removal performances of heavy metal cations. Adsorption results indicated that MACB/C-C exhibited thorough separation from aqueous solution and greater uptake ability for Pb(II) and Cd(II) (483 mg·g-1 and 123 mg·g-1) than the nascent MACB (335 mg·g-1 and 76 mg·g-1), respectively, at pH 5 and 25 °C temperature. The adsorption of Pb(II) and Cd(II) on MACB/C-C mainly occurred via surface precipitation and complexation when pH > 2. MACB/C-C could be efficiently recycled with marginal decrease in adsorption capacity. The current approach credited to the convenient operation, simplified synthesis, and high efficiency of MACB/C-C could be deemed as a promising alternative for the removal of heavy metal cations from wastewater.
['Wang|Yingya|Y|', 'Zhang|Hanbing|H|', 'Yaseen|Muhammad|M|', 'Tong|Zhangfa|Z|http://orcid.org/0000-0002-7269-1854', 'Chen|Ninghua|N|', 'Shi|Huazhen|H|']
D000327:Adsorption D001546:Bentonite D002104:Cadmium D002266:Carboxymethylcellulose Sodium D048271:Chitosan D006863:Hydrogen-Ion Concentration D007700:Kinetics D007854:Lead D060328:Magnetic Phenomena D014874:Water Pollutants, Chemical
Alkaline Ca-bentonite Magnetic stability Heavy metals Carboxymethylcellulose Adsorption isotherm