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以荔枝皮为吸附剂对低含量磷进行静态吸附实验,并对其吸附时间、p H和吸附剂量、吸附等温线、吸附动力学和热力学等进行研究。结果表明,适宜的p H为2~8、吸附时间为80 min、吸附剂投加量为10 g/L,在此条件下,荔枝皮对磷的去除率最高可达93.18%。荔枝皮对磷的吸附过程符合Freundlich和Langmuir等温线模型,其最大吸附量为8.772 mg/g,并且其吸附属于自发的吸热过程,符合准2级动力学模型。与其他除磷吸附剂相比,荔枝皮具有吸附时间较短,p H适应性广和吸附量大的优点,是一种有效的除磷吸附剂。
Litchi bark was used as adsorbent to study the static adsorption of low content of phosphorus, and the adsorption time, pH and adsorption amount, adsorption isotherms, adsorption kinetics and thermodynamics were studied. The results showed that the optimal pH was 2 ~ 8, the adsorption time was 80 min and the dosage of adsorbent was 10 g / L. Under this condition, the phosphorus removal rate of litchi bark up to 93.18%. The adsorption of phosphorus by litchi peel conformed to the Freundlich and Langmuir isotherm model with the maximum adsorption capacity of 8.772 mg / g and the adsorption was spontaneous endothermic process, which accorded with quasi-second-order kinetic model. Compared with other phosphorus-removing adsorbents, litchi bark has the advantages of shorter adsorption time, wider p H adaptability and larger adsorption capacity, and is an effective phosphorus removal adsorbent.