Department of Chemistry, Marquette University, Milwaukee, WI 53201-1881, USA.
Water Sci Technol. 2012;65(5):940-7. doi: 10.2166/wst.2012.935.
Atrazine removal from water by treated banana peels was studied. The effect of pH, contact time, initial atrazine concentration, and temperature were investigated. Batch experiments demonstrated that 15 g L(-1) adsorbent dosage removed 90-99% of atrazine from 1-150 ppm aqueous solutions. The removal was both pH and temperature dependent with the most atrazine removed between pH 7 and 8.2 and increased with increasing temperature. Equilibrium data fitted well to the Langmuir and Redlich-Peterson models in the concentration and temperature ranges investigated, with a maximum adsorption capacity of 14 mg g(-1). Simple mass transfer models were applied to the experimental data to examine the adsorption mechanism and it was found that both external mass transfer and intraparticle diffusion played important roles in the adsorption mechanisms. The enthalpy of atrazine adsorption was evaluated to be 67.8 ± 6.3 kJ mol(-l) with a Gibbs free energy of -5.7 ± 1.2 kJ mol(-1).
研究了用处理过的香蕉皮去除水中的莠去津。考察了 pH 值、接触时间、莠去津初始浓度和温度的影响。批量实验表明，15g/L 的吸附剂用量可去除 1-150ppm 水溶液中 90-99%的莠去津。去除率既依赖于 pH 值又依赖于温度，在 pH 值为 7 到 8.2 之间去除率最高，且随温度升高而增加。在研究的浓度和温度范围内，平衡数据与 Langmuir 和 Redlich-Peterson 模型拟合良好，最大吸附容量为 14mg/g。应用简单的传质模型对实验数据进行了考察，以研究吸附机制，发现外部传质和颗粒内扩散都在吸附机制中起重要作用。莠去津吸附的焓值为 67.8±6.3kJ/mol，吉布斯自由能为-5.7±1.2kJ/mol。
