Kumar Eva, Bhatnagar Amit, Ji Minkyu, Jung Woosik, Lee Sang-Hun, Kim Sun-Joon, Lee Giehyeon, Song Hocheol, Choi Jae-Young, Yang Jung-Seok, Jeon Byong-Hun
Department of Environmental Engineering, Baekun Hall #332, Yonsei University, 234 Maeji Heungeop, Wonju, 220-710 Gangwon-do, South Korea.
Water Res. 2009 Feb;43(2):490-8. doi: 10.1016/j.watres.2008.10.031. Epub 2008 Nov 1.
This research was undertaken to evaluate the feasibility of granular ferric hydroxide (GFH) for fluoride removal from aqueous solutions. Batch experiments were performed to study the influence of various experimental parameters such as contact time (1 min-24h), initial fluoride concentration (1-100 mgL(-1)), temperature (10 and 25 degrees C), pH (3-12) and the presence of competing anions on the adsorption of fluoride on GFH. Kinetic data revealed that the uptake rate of fluoride was rapid in the beginning and 95% adsorption was completed within 10 min and equilibrium was achieved within 60 min. The sorption process was well explained with pseudo-first-order and pore diffusion models. The maximum adsorption capacity of GFH for fluoride removal was 7.0 mgg(-1). The adsorption was found to be an endothermic process and data conform to Langmuir model. The optimum fluoride removal was observed between pH ranges of 4-8. The fluoride adsorption was decreased in the presence of phosphate followed by carbonate and sulphate. Results from this study demonstrated potential utility of GFH that could be developed into a viable technology for fluoride removal from drinking water.
本研究旨在评估氢氧化铁颗粒（GFH）从水溶液中去除氟化物的可行性。进行了批量实验，以研究各种实验参数的影响，如接触时间（1分钟至24小时）、初始氟化物浓度（1至100mgL(-1)）、温度（10和25摄氏度）、pH值（3至12）以及竞争性阴离子的存在对氟化物在GFH上吸附的影响。动力学数据表明，氟化物的吸收速率在开始时很快，95%的吸附在10分钟内完成，60分钟内达到平衡。用伪一级和孔扩散模型很好地解释了吸附过程。GFH去除氟化物的最大吸附容量为7.0mgg(-1)。发现吸附是一个吸热过程，数据符合朗缪尔模型。在pH值为4至8的范围内观察到最佳的氟化物去除效果。在磷酸盐存在的情况下，氟化物的吸附减少，其次是碳酸盐和硫酸盐。本研究结果表明，GFH具有潜在的实用性，可发展成为一种可行的饮用水除氟技术。
