Abstract
In this work,porous biochar(MN-TRB750)was fabricated via direct pyrolysis of tea residue(TR)and Mg(NO3)2·6H2O(MN).The as-synthesized MN-TRB750 reached a specific surface area of 839.54 m2·g-1 and an average pore size of 3.75 nm with multi-level pore architecture.MN decreased TR's carbonization temperature and promoted the aromatics extent,pore structure for the frizzly flake-like bio-char.Rhodamine B(RhB)was chosen as the adsorbate to explore the removal performance of organic dyes in this study.The results indi-cated that the maximum adsorption capacity of RhB on MN-TRB750 at 20 ℃ is up to 809.0 mg·g-1 with isotherms fitted well to Freundlich and Dubinin-Radushkevic models.The adsorption kinetics followed pseudo-second-order and Elovich models with an equilibrium adsorp-tion capacity of 757.6 mg·g-1 as the initial concentration of RhB is 260 mg·L-1.High pore filling,hydrogen bond,π-π interaction deter-mined the adsorption of RhB onto MN-TRB850 through a multi-active center and exothermic chemical sorption process.
基金项目
Innovation and Entrepreneurship Plan Project of Shaanxi Province()
Shaanxi Xueqian Normal University for College Students(S202314390048)
Shaanxi Xueqian Normal University for College Students(2023DC048)
NETL
NSTL
万方数据