ABSTRACT

One major cause of aquatic pollution is the accumulation of heavy metal ions. This review is aimed to examine the application of natural biofilm as biosorbent for Mg(II), Cr(VI), and Cu(II), as an eco-friendly, economical, and efficient remediation strategy. Biofilm matrices were collected from different freshwater ecosystems to observe their biosorption properties. The compared EPM values of the different biofilms showed a universal trend. Additionally, the adsorption kinetics of all three ions occurred within 1 minute. The amount of adsorbed Mg(II) was higher than Cu(II), owing to the larger charge density of Mg(II). Interestingly, the b values revealed that Mg(II) was desorbed the quickest among the three ions, which is likely to be influenced by its highest solubility. Thus, both charge density and solubility determined the ions’ biosorption characteristics. Therefore, physicochemical properties of heavy metal pollutants should be understood to achieve an effective bioremediation by natural biofilm.

摘要

水体污染的主要原因之一是重金属离子的积累。本综述旨在探讨天然生物膜作为 Mg(II)、Cr(VI) 和 Cu(II) 生物吸附剂的应用，作为一种生态友好、经济且高效的修复策略。从不同的淡水生态系统收集生物膜基质以观察其生物吸附特性。不同生物膜的EPM值的比较显示出普遍的趋势。此外，所有三种离子的吸附动力学均在 1 分钟内发生。由于 Mg(II) 的电荷密度较大，因此 Mg(II) 的吸附量高于 Cu(II)。有趣的是，b 值表明 Mg(II) 在三种离子中解吸速度最快，这可能受到其最高溶解度的影响。因此，电荷密度和溶解度决定了离子的生物吸附特性。因此，应了解重金属污染物的理化性质，以实现天然生物膜的有效生物修复。