Adsorption properties of chitosan/magnetic biochar for Cu(Ⅱ) removal from solution [壳聚糖/磁性生物碳对重金属Cu(Ⅱ)的吸附性能]

作者：Xiao F.; Zhang Y.; Cheng J.^*; Yang C.; Hu Y.

来源：Chinese Journal of Environmental Engineering, 2019, 13(5): 1048-1055.

DOI：10.12030/j.cjee.201810181

• Adsorption
• Biochar
• Chitosan
• Cu(Ⅱ)

In this study, loofah was used to prepare magnetic biochar combined with chitosan (CMLB), and the Cu(Ⅱ) adsorption properties were compared for biochar before and after modification. The results showed that the modified biochar was coated with a layer of γ-Fe2O3 nanoparticles with uniform size. CMLB had higher Cu(Ⅱ) adsorption capacity of 54.68 mg?g-1 than pristine biochar and magnetic biochar,it could account for 86% chitosan adsorption capacity. The adsorption equilibrium time was 18 h and a good adsorption result occurred at pH of 5.8±0.1. The kinetics and thermodynamics of adsorption process could be well fitted with a pseudo-second-order kinetic model and a Freundlich one, respectively. The mechanisms of Cu(Ⅱ) removal included ion exchange,physical adsorption and surface coprecipitation. The used CMLB after heavy metal adsorption can be separated from solution by using an external magnetic field. These results showed that CMLB could effectively absorb heavy metal from water and have a good prospect of application in water and wastewater treatment.

• 单位
  华南理工大学