Effect of oxidative aging of biochar on relative distribution of competitive adsorption mechanism of Cd²⁺ and Pb².

ABSTRACT: In this study, aged biochar (CCB350 and CCB650) were obtained from pyrolysis of corn stalk biochar (CB350 and CB650) at the degree of 350 °C and 650 °C by artificial oxidation with hydrogen peroxide (H₂O₂). Also, the mechanism of Pb²⁺ and Cd²⁺ on fresh and aged biochars was analyzed qualitatively and quantitatively by batch adsorption experiments combined with characterization. The adsorption isotherm results showed that aging treatment decreased the adsorption capacity of Pb²⁺ and Cd²⁺ and inhibited the competitive adsorption behavior of heavy metals. In the single-metal system, precipitation and cation exchange were considered as the main adsorption mechanisms for CB350 and CB650, with a ratio of 40.07-48.23% and 38.04-57.

SUBMITTER: Wang Z 

PROVIDER: S-EPMC9252994 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature