Civil Engineering Department, Netaji Subhas University of Technology West Campus, Jaffarpur, New Delhi, 110073, India.
Department of Chemistry, School of Applied Sciences, Gautam Buddha University, Greater Noida, UP, India.
Environ Res. 2024 Mar 1;244:117952. doi: 10.1016/j.envres.2023.117952. Epub 2023 Dec 17.
In developing countries like India, an economically viable and ecologically approachable strategy is required to safeguard the drinking water. Excessive fluoride intake through drinking water can lead to dental fluorosis, skeletal fluorosis, or both. The present study has been under with an objective to investigate the feasibility of using cellulose derived from coconut fiber as an adsorbent under varying pH conditions for fluoride elimination from water. The assessment of equilibrium concentration of metal ions using adsorption isotherms is an integral part of the study. This present finding indicates the considerable effect of variation of adsorbent dosages on the fluoride removal efficiency under constant temperature conditions of 25 ± 2 °C with a contact period of 24 h. It is pertinent to mention that maximum adsorption of 88% has been observed with a pH value of 6 with 6 h time duration with fluoride dosage of 50 mg/L. The equilibrium concentration dwindled to 0.4 mg/L at fluoride concentration of 20 mg/L. The Langmuir model designates the adsorption capacity value of 2.15 mg/L with initial fluoride concentration of 0.21 mg/g with R value of 0.660. Similarly, the adsorption capacity using Freundlich isotherms is found to be 0.58 L/g and 0.59 L/g with fluoride concentration of 1.84 mg/L and 2.15 mg/L respectively. The results from the present study confirm that coconut fiber possesses appropriate sorption capabilities of fluoride ion but is a pH dependent phenomenon. The outcomes of the study indicate the possible use of cellulose extracted from waste coconut fiber as a low-cost fluoride adsorbent. The present study can be well implemented on real scale systems as it will be beneficial economically as well as environmentally.
在印度等发展中国家，需要一种经济可行且对生态环境友好的策略来保护饮用水。通过饮用水摄入过多的氟会导致氟斑牙、氟骨症，或两者兼有。本研究旨在探索在不同 pH 值条件下，利用椰子纤维衍生的纤维素作为吸附剂从水中去除氟的可行性。使用吸附等温线评估金属离子的平衡浓度是研究的一个组成部分。本研究结果表明，在 25±2°C 的恒温条件下，接触时间为 24 小时，吸附剂剂量的变化对氟去除效率有很大影响。值得一提的是，在 pH 值为 6 时，吸附剂量为 50mg/L，氟化物剂量为 50mg/L 时，观察到最大吸附率为 88%。当氟化物浓度为 20mg/L 时，平衡浓度降至 0.4mg/L。Langmuir 模型指定吸附容量值为 2.15mg/L，初始氟浓度为 0.21mg/g，R 值为 0.660。同样，使用 Freundlich 等温线，在氟化物浓度分别为 1.84mg/L 和 2.15mg/L 时，吸附容量分别为 0.58L/g 和 0.59L/g。本研究结果证实，椰子纤维具有适当的氟离子吸附能力，但这是一种依赖于 pH 值的现象。研究结果表明，从废椰子纤维中提取的纤维素可能被用作低成本的氟离子吸附剂。本研究可以在实际规模系统中很好地实施，因为它在经济和环境方面都将是有益的。
