Removal of methylene blue by Zn-Al layered double oxide/magnetic biochar derived from waste pineapple peel

Pineapple peel is a kind of agricultural and forestry waste and biochar is an environmentally friendly adsorbent, but the adsorption capacity of biochar needs to be improved, and it is not easy to separate after adsorption. In order to solve these problems, Zn-Al layered double oxide/magnetic pineapple peel biochar (ZnAl-LDO/MPC1) was prepared based on Zn-Al layered double hydroxide/magnetic pineapple peel biochar (ZnAl-LDH/MPC1) calcined at 400 degrees C with 10 degrees C/min for 4 h. According to SEM, XRD, FTIR, BET analysis, and magnetic analysis, characterization of the samples was carried out. Under different pH, contact time, original concentration of methylene blue (MB), and ionic strength, the adsorption experiments of removing MB on ZnAl-LDO/MPC1 were conducted. The adsorption kinetics of ZnAl-LDO/MPC1 for MB conforms to the quasi-second-order kinetic model, and the adsorption isotherm of ZnAl-LDO/MPC1 for MB fits the Langmuir isothermal adsorption model. ZnAl-LDO/MPC1 can be applied four times in the circulatory system. The findings suggested that ZnAl-LDO/MPC1 has application prospects as an efficient and recyclable MB adsorbent for the treatment of dye wastewater.

Automated summary

Zn-Al layered double oxide/magnetic pineapple peel biochar was prepared and found to have good adsorption performance for methylene blue, and it can be recycled.