Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
J Colloid Interface Sci. 2015 Mar 1;441:113-20. doi: 10.1016/j.jcis.2014.10.039. Epub 2014 Nov 4.
Excessive fluoride in water causes serious environmental issues and adverse impacts on human health. In this study, an innovative lanthanum-modified carbon (LMC) adsorbent rooted in Sargassum sp. was developed for fluoride removal. Excellent removal efficiency was observed over a wide pH range of 3-9. Almost 90% of fluoride adsorption occurred within the first 1h; the equilibrium was established within 4h. The maximum adsorption capacity of LMC could reach 94.34 mg/g at neutral pH, much higher than many commercial adsorbents. Although the presence of such competitive anions as SiO3(2-), SO4(2-), HCO3(-), PO4(3-) and AsO3(-) had certain interference on fluoride uptake, it was noticed that there was no significant impact in the presence of humic acid. Furthermore, according to the instrumental analysis, the fluoride removal was majorly controlled by outer-sphere complex adsorption, while electrostatic attraction and ion exchange mechanisms could also be observed in the fluoride adsorption process. The findings from this study suggest that our adsorbent may have a great potential in industrial applications.
水中过量的氟会导致严重的环境问题和对人类健康的不良影响。在这项研究中，开发了一种基于马尾藻的创新镧改性碳 (LMC) 吸附剂，用于去除氟化物。在 pH 值为 3-9 的较宽范围内观察到优异的去除效率。几乎 90%的氟吸附在最初的 1 小时内发生；4 小时内达到平衡。在中性 pH 值下，LMC 的最大吸附容量可达 94.34mg/g，远高于许多商业吸附剂。尽管存在 SiO3(2-)、SO4(2-)、HCO3(-)、PO4(3-)和 AsO3(-)等竞争阴离子会对氟化物的吸收产生一定干扰，但在存在腐殖酸的情况下，并未发现明显影响。此外，根据仪器分析，氟化物的去除主要受外球络合吸附控制，而在氟化物吸附过程中也可以观察到静电吸引和离子交换机制。这项研究的结果表明，我们的吸附剂在工业应用中可能具有很大的潜力。
