Adsorption Characteristics of Cd 2+ Ions in Aqueous Solution on Modified Straw Biochar

Bo Tang (), Haopu Xu, Fengmin Song and Zhifeng Liu
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Bo Tang: School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Haopu Xu: School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Fengmin Song: School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Zhifeng Liu: School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China

Sustainability, 2023, vol. 15, issue 5, 1-12

Abstract: Rice straw and corn straw were selected as raw materials to prepare biocharby anoxic carbonization and the biochar was loaded on the surface with FeCl 3 , MnCl 2 and Fe(NO 3 ) 3 & KMnO 4 , respectively, and then two types of straw biochar and six types of modified biochar were prepared. FT-IR, SEM, and XRD were used to characterize and analyze the physical and chemical properties of the biochar. The adsorption kinetics and adsorption isothermal tests of Cd 2+ ions in aqueous solution were carried out. The results showed that modified biochars attached more active sites and surface group, especially iron-manganese-modified biochar (FMBC1, FMBC2). The kinetic adsorption tests showed that the adsorption process of eight kinds of biochar all conformed to the quasi-second-order kinetic equation, and chemisorption maybe dominated the adsorption process. The adsorption isothermal test showed that the adsorption process of Cd 2+ ions by FeCl 3 -modified biochar (FBC1, FBC2) and Fe(NO 3 ) 3 & KMnO 4 -modified biochar (FMBC1, FMBC2) conforms to the Freundlich model, and the adsorption process of Cd 2+ ions by MnCl 2 -modified biochar (MBC1, MBC2) conforms to Langmuir model. Compared with other kinds of biochar, the K F value of Fe(NO 3 ) 3 & KMnO 4 -modified biochar of rice straw biochar (FMBC1) was the largest, reached 18.602 L·mg −1 , and its 1/n value was the smallest, it reached 0.474, indicating that the adsorption effect on Cd 2+ of FMBC1 was the best.

Keywords: biochar; modification; manganese modification; iron-manganese modification; Cd 2+ ions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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