Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia.
Appl Biochem Biotechnol. 2012 Jul;167(6):1699-715. doi: 10.1007/s12010-011-9521-7. Epub 2012 Jan 6.
Biosorption of copper (Cu), zinc (Zn), and lead (Pb) on watermelon rind in a well-stirred batch system was investigated. pH showed significant influence on the biosorption process. Optimal pH for Cu, Zn, and Pb biosorption was found to be 5.0, 6.8 and 6.8, respectively. Watermelon rind was in favor of Pb and it could remove up to 99% Pb between pH ranges of 5 and 6.8 when Pb concentration is lower than 100 mg/L. The biosorptive capacity of watermelon on Cu, Zn, and Pb was 6.281, 6.845, and 98.063 mg/g, respectively. The equilibrium data fitted well to Langmuir adsorption isotherm while pseudo-second-order kinetic model exhibited more advantages for describing kinetic data than pseudo-first-order kinetic model. NaOH was found to be a suitable eluent. After desorption in NaOH solution, the resorption efficiency reached as high as 99% of these three metals either in a single-component or multi-component system. From the characterization study, ion exchange and micro-precipitation were estimated to be the main mechanisms. Due to its high metal uptake capacity, reusability, and metal recovery, watermelon rind can be considered as an eco-friendly and economic biosorbent for removing Pb from water and wastewater.
采用搅拌批次法研究了西瓜皮对铜（Cu）、锌（Zn）和铅（Pb）的生物吸附作用。pH 值对生物吸附过程有显著影响。Cu、Zn 和 Pb 的最佳吸附 pH 值分别为 5.0、6.8 和 6.8。当 Pb 浓度低于 100mg/L 时，西瓜皮有利于 Pb 的吸附，在 pH 值为 5 到 6.8 之间，Pb 的去除率高达 99%。西瓜皮对 Cu、Zn 和 Pb 的吸附容量分别为 6.281、6.845 和 98.063mg/g。平衡数据拟合Langmuir 吸附等温线，而准二级动力学模型比准一级动力学模型更能描述动力学数据。NaOH 被发现是一种合适的洗脱剂。NaOH 溶液解吸后，无论是在单一或多金属组分体系中，三种金属的再吸收率均高达 99%。从表征研究来看，离子交换和微沉淀被认为是主要的作用机制。由于西瓜皮具有高金属吸附能力、可重复使用性和金属回收能力，因此可将其视为一种从水中去除 Pb 的环保且经济的生物吸附剂。
