Abstract

Pretreated waste Streptomyces fradiae biomass was used as biosorbent to remove tetracycline (TC) from model aqueous solutions. The biosorption study was conducted in a batch system to evaluate the impact of initial pH, biosorbent dosage, initial TC concentration and contact time. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models were applied to describe the biosorption isotherm equilibrium studies. Langmuir and Freundlich models fitted the equilibrium data better than the D–R model. The monolayer biosorption capacity of the pretreated biomass for TC was 38.61 mg g⁻¹. The experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second order kinetics models. The results showed that the TC biosorption process followed well pseudo-second-order kinetics.

摘要

预处理的废物链霉菌生物质用作生物吸附剂以从模型水溶液中去除四环素 (TC)。生物吸附研究在分批系统中进行，以评估初始 pH 值、生物吸附剂剂量、初始 TC 浓度和接触时间的影响。Langmuir、Freundlich 和 Dubinin-Radushkevich (D-R) 模型用于描述生物吸附等温线平衡研究。Langmuir 和 Freundlich 模型比 D-R 模型更适合平衡数据。预处理生物质对 TC 的单层生物吸附能力为 38.61 mg g ^-1. 还使用伪一级和伪二级动力学模型在生物吸附动力学方面测试了实验数据。结果表明，TC 生物吸附过程遵循良好的伪二级动力学。