Adsorption and Desorption Characteristics of Cd²⁺ and Pb²⁺ by Micro and Nano-sized Biogenic CaCO₃.

ABSTRACT: The purpose of this study was to elucidate the characteristics and mechanisms of adsorption and desorption for heavy metals by micro and nano-sized biogenic CaCO₃ induced by Bacillus subtilis, and the pH effect on adsorption was investigated. The results showed that the adsorption characteristics of Cd²⁺ and Pb²⁺ are well described by the Langmuir adsorption isothermal equation, and the maximum adsorption amounts for Cd²⁺ and Pb²⁺ were 94.340 and 416.667 mg/g, respectively. The maximum removal efficiencies were 97% for Cd²⁺, 100% for Pb²⁺, and the desorption rate was smaller than 3%. Further experiments revealed that the biogenic CaCO₃ could maintain its high adsorption capability for heavy metal

SUBMITTER: Liu R 

PROVIDER: S-EPMC5790784 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature