ABSTRACT

Low molecular weight algal organic matter (AOM), as a frequent water contaminant with poor coagulation efficiency, adversely affects the quality of produced water and serves as a source of potentially carcinogenic disinfection by-products. AOM removal from water is inevitable to eliminate the negative health and environmental impacts. This research evaluates the removal of arginine, phenylalanine and aspartic acid, which are amino acids abundant in AOM. Adsorption experiments were performed at 10, 18 and 25 °C and pH 5, 7 and 9 using two different activated carbons (FTL, PIC). Amino acids showed endothermic adsorption behaviour, with a higher removal at higher temperature. Higher temperature increased the diffusion of amino acid molecules, reduced the solution viscosity, or enhanced the hydrophobic interactions contributing to adsorption. The effect of temperature manifested differently during experiments depending on the chemical nature of the amino acids, the pH value and the surface properties of the carbon. Phenylalanine isotherms showed specific waves (Langmuir type 4). pH had a greater effect on arginine adsorption than did temperature. Aspartic acid isotherms exhibited a decrease in adsorption at higher pH values and higher temperatures. The principal mechanisms involved in amino acid adsorption were hydrophobic interactions, electrostatic interactions or hydrogen bonds.

摘要

低分子量藻类有机物（AOM）作为一种常见的水污染物，混凝效率低，对采出水质量产生不利影响，并成为潜在致癌消毒副产物的来源。从水中去除 AOM 是不可避免的，以消除对健康和环境的负面影响。这项研究评估了精氨酸、苯丙氨酸和天冬氨酸的去除，这些氨基酸是 AOM 中丰富的氨基酸。使用两种不同的活性炭（FTL，PIC）在 10、18 和 25 °C 和 pH 5、7 和 9 下进行吸附实验。氨基酸表现出吸热吸附行为，在较高温度下具有较高的去除率。较高的温度增加了氨基酸分子的扩散，降低了溶液粘度，或增强了有助于吸附的疏水相互作用。根据氨基酸的化学性质、pH 值和碳的表面性质，在实验过程中温度的影响会有所不同。苯丙氨酸等温线显示特定波（Langmuir 4 型）。pH对精氨酸吸附的影响大于温度。天冬氨酸等温线在较高的 pH 值和较高的温度下表现出吸附减少。涉及氨基酸吸附的主要机制是疏水相互作用、静电相互作用或氢键。天冬氨酸等温线在较高的 pH 值和较高的温度下表现出吸附减少。涉及氨基酸吸附的主要机制是疏水相互作用、静电相互作用或氢键。天冬氨酸等温线在较高的 pH 值和较高的温度下表现出吸附减少。涉及氨基酸吸附的主要机制是疏水相互作用、静电相互作用或氢键。