Saberzadeh Sarvestani Firozeh, Esmaeili Hossein, Ramavandi Bahman
Department of Chemical Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran.
Environmental Health Engineering Department, Faculty of Health and Nutrition, Bushehr University of Medical Sciences, Bushehr, Iran.
3 Biotech. 2016 Dec;6(2):251. doi: 10.1007/s13205-016-0570-z. Epub 2016 Nov 22.
In this paper, a new and facile approach for molybdate loading in the brown algae of Sargassum angustifolium is introduced. The molybdate ions were entered into the algae body during a short cultivation to produce algae-Mo as a novel adsorbent for eliminating phosphate ions from synthetic and real wastewaters. Results of the surface analysis showed that molybdate loading onto the algae was successfully performed. Herein, basic variables, such as initial solution pH, adsorbent dosage, contact time, phosphate concentration, and temperature, were investigated in detail to assess the phosphate adsorption performance of algae-Mo. The pseudo-second-order kinetic model fitted our acquired experimental kinetic data most appropriately, in comparison to the use of a pseudo-first-order model. The Langmuir model appeared to fit the adsorption data more desirably than that of Freundlich and Dubnin-Radushkevich models, with a maximum phosphate adsorption capacity of 149.25 mg/g at 25 °C. The finding of the thermodynamic study revealed that the phosphate adsorption onto algae-Mo was spontaneous, feasible, and endothermic in nature. The study on Mo ions leaching strongly suggested that the risk of Mo leakage during phosphate adsorption was negligible at a wide pH range of 3-9. The adsorption efficiency attained was 53.4% at the sixth cycle of reusability. Two real wastewaters with different qualities were successfully treated by the algae-Mo, suggesting that the algae-Mo could be ordered for practical wastewater treatment.
本文介绍了一种在狭叶马尾藻中负载钼酸盐的新方法。在短期培养过程中，钼酸根离子进入藻体，生成藻 - 钼作为一种新型吸附剂，用于去除合成废水和实际废水中的磷酸根离子。表面分析结果表明，钼酸盐成功负载到了藻类上。在此，详细研究了初始溶液pH值、吸附剂用量、接触时间、磷酸盐浓度和温度等基本变量，以评估藻 - 钼对磷酸盐的吸附性能。与伪一级动力学模型相比，伪二级动力学模型最适合拟合我们获得的实验动力学数据。Langmuir模型似乎比Freundlich模型和Dubnin - Radushkevich模型更能拟合吸附数据，在25℃时最大磷酸盐吸附容量为149.25mg/g。热力学研究结果表明，藻 - 钼对磷酸盐的吸附是自发、可行且吸热的。钼离子浸出研究强烈表明，在3 - 9的宽pH范围内，磷酸盐吸附过程中钼泄漏的风险可忽略不计。在第六次重复使用循环中，吸附效率达到了53.4%。藻 - 钼成功处理了两种不同水质的实际废水，表明藻 - 钼可用于实际废水处理。
