邻苯二甲酸及丙二酸对方解石吸附四环素的影响
Effect of organic dicarboxylic acid on the adsorption of tetracycline by calcite
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摘要:
通过批量平衡法,研究丙二酸及邻苯二甲酸对方解石吸附四环素的影响.结果表明,初始pH值为7.7时,随丙二酸和邻苯二甲酸浓度升高,它们的吸附竞争作用逐渐增强,四环素的吸附率不断下降.初始pH值为8.3时,丙二酸浓度为0-0.001 mmol·L-1时,它的竞争作用较弱,而溶液pH值的变化(8.3-8.5)有利于四环素吸附,所以四环素吸附率上升;丙二酸浓度为0.001-0.03 mmol·L-1时,它的竞争作用较强,且溶液pH值的变化(8.5-8.9)不利于四环素吸附,所以四环素吸附率下降.邻苯二甲酸浓度为0-1.8 mmol·L-1时,它的竞争作用较弱,而溶液pH值的变化(8.3-8.5)有利于四环素吸附,因而四环素吸附率不断上升.初始pH值为8.9时,丙二酸与邻苯二甲酸大部分都参与到溶液中的配位络合反应,对四环素的吸附影响不大.以上两种二羧酸在不同的实验条件下对四环素吸附分别产生了不同的影响结果,为今后研究其他二羧酸对四环素吸附的影响提供借鉴作用.
Abstract:Batch sorption experiments were performed to investigate the effects of malonate and phthalate on tetracycline (TC) sorption by calcite. The results showed that at the initial pH of 7.7, the competitive adsorption of malonate and phthalate gradually increased with the increase of concentrations, resulting in a continuous decrease of TC adsorption rate. At the initial pH of 8.3, TC adsorption rate increased with malonate concentration of 0-0.001 mmol·L-1, as the increase of pH (8.3-8.5) was favorable for TC adsorption. Meanwhile, the inhibition of malonate on TC adsorption was weak. However, TC adsorption rate decreased with malonate concentration of 0.001-0.03 mmol·L-1, due to the incereased inhibition of malonate, and the increase of pH (8.5 to 8.9) which is negative. With phthalate concentration of 0-1.8 mmol·L-1, where the inhibition of phthalate was weak, TC adsorption rate kept increasing since the increase of pH (8.3-8.5) had a positive effect on TC adsorption. At the initial pH of 8.9, most malonate or phthalate took part in complexation reaction in solution, which had little impact on the TC adsorption. These dicarboxylic acids have different effects on TC adsorption under different experimental conditions, which can provide a reference for future studies on the effects of other dicarboxylic acids on TC adsorption.
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Key words:
- calcite /
- phthalate /
- malonate /
- tetracycline
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