改性稻壳生物炭对水体Cu^(2+) 、Zn^(2+) 的吸附特性与机制研究

Research on Adsorption Characteristics and Mechanisms of Copper and Zinc Ion by Modified Rice Husk Biochar

以稻壳为原料制备生物炭并进行功能化改性,用于去除水体中的Cu^(2+)、Zn^(2+)。结果表明,改性后生物炭表现出更佳的吸附性能。对于高浓度Cu^(2+)、Zn^(2+)二元溶液,生物炭优先吸附Cu^(2+)。准二级动力学模型和颗粒内扩散动力学模型均能较好地拟合吸附过程,Cu^(2+)、Zn^(2+)的吸附过程受化学吸附控制,溶质的传质速率几乎全部受限于边界层扩散。改性生物炭可作为一种高效去除水中Cu^(2+)、Zn^(2+)的吸附剂。

The biochar prepared from rice husks is functionalized to remove Cu^(2+)and Zn^(2+)in waste water.The results show that the modified biochar has better adsorption performance.In binary solutions,which contain high concentrations of Cu^(2+)and Zn^(2+),biochar preferentially adsorbs Cu^(2+).According to the kinetic analysis,both the pseudo second-order model and the intra-particle diffusion model can better fit the adsorption process.It is controlled by chemical adsorption,and the mass transfer rate of solutes is almost entirely limited by boundary layer diffusion.Modified biochar can be used as an adsorbent,which can efficiently remove Cu^(2+)and Zn^(2+)from water.