煤矿区废水中溶解性有机质与铜的结合特性

为研究煤矿区废水排放对环境中重金属化学行为的影响,通过荧光滴定实验,利用铜离子选择电极法和荧光猝灭法定量化研究了矿井水和生活污水中溶解性有机质对铜的结合行为.结果表明,铜离子选择性电极法能精确地定量化这2类废水中有机质对铜的结合容量,其中矿井水中有机质对铜具有较大的结合容量,可以达到163.9mg/g,而生活污水中有机质对铜的结合容量相对较小,只有72.6mg/g.荧光猝灭法结果表征了这2类废水中各个组分对铜的结合特性,其中矿井水中的富里酸(A峰)对铜具有较强的结合容量,而生活污水中的类蛋白组分对铜的结合能力相对较弱.2类废水与铜结合前后的红外光谱变化结果表明矿井水中腐殖酸物质与铜的结合是一种化学反应,其中的酚羟基和羧基等官能团参与了反应,但生活污水中类蛋白物质的官能团与铜并没有发生化学结合反应.

Quantitative characterization of Cu binding potential of dissolved organic matter in wastewater of mining area.

In order to study the influence of the two wastewaters on the environmental behavior of heavy metals, a titration experiment was adopted to quantitatively characterize the interaction between Cu and DOM in mine water and domestic wastewater in a mining area using an ion-selective electrode and fluorescence quenching technology. The results showed that the Cu ion-selective electrode accurately characterized the complex capacity of DOM for Cu (II). The mine water had a high complex capacity for Cu, which accounted for 163.9mg/g, whereas the domestic wastewater had a low complex capacity, which was only 72.6mg/g. The fluorescence quenching results provided information about the bond characterization of different components of DOM for Cu. The fulvic acid matters (peak A) in mine water had a high complex capacity, whereas the complex capacity of protein matter components in domestic wastewater was relative low. The change in Fourier Transform Infrared spectroscopy (FTIR) implied that the reaction mechanism between humic matters in mine water and Cu was a chemical reaction, however, the reaction mechanism between protein matters in domestic wastewater and Cu may be only physical adsorption. The carboxylic and hydroxyl groups in humic matters were the major active sites for combining Cu, while the functional group in protein was not active in the reaction with Cu (II).