作 者：
Li Fengchuan;Zeng Shuai;Wu Minghui;Li Tao;Li Huijuan;Li Xianghong;Key Laboratory of National Forestry and Grassland Administration on Highly Efficient Utilization of Forestry Biomass Resources, College of Chemical Engineering, Southwest Forestry University;
关键词：
walnut shell biochar;;Rhodamine B;;adsorption;;mechanism;;phosphoric acid
摘 要：
Using walnut shell as raw material, walnut shell biochar(WSBC) was synthesized via H_3PO_4 activation for Rhodamine B(RhB) removal. The obtained WSBC was characterized by FTIR, XRD, SEM, BET and the adsorption process was investigated by UV–vis. The effects of concentration of H_3PO_4, roasting temperature, adsorption temperature, adsorbent dosage, initial concentration, pH value were investigated on RhB adsorption over WSBC. Results suggested that WSBC had available porosity and rich functional groups on the surface of WSBC.There was no obvious change in crystal phase before and after adsorption. When the concentration of H_3PO_4 was0.5 mol/L, roasting temperature was 600 ℃, roasting time was 2 h, reaction temperature was 20 ℃, the initial concentration of RhB was 10 mg/L,the amount of WSBC was 2 g/L and adsorption time was 60 min, the removal rate of RhB could reach 90%. The adsorption of RhB on WSBC could well-fitted by pseudo-second-order kinetic model and Langmuir isotherms model,the maximum theoretical adsorption capacity of WSBC for RhB is12.61 mg/g.
