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在不同p H下,以纳米碳管(CNTs)为模型吸附剂,探讨磺胺甲恶唑(SMX)对磷酸盐吸附的影响机理.结果表明,磷酸盐在羧基化纳米碳管(MC)上的吸附明显受p H的控制,低p H下表现为高吸附,高p H下表现为低吸附,静电作用可能是控制磷酸盐吸附的主要机制;SMX的加入降低了CNTs对磷酸盐的吸附,归因于直接的点位竞争;由于SMX和磷酸盐形态的变化,可以通过电荷中和或排斥,改变磷酸盐与CNTs之间的静电作用,导致在不同p H下SMX表现出对磷酸盐不同的竞争能力.
The effect mechanism of sulfamethoxazole (SMX) on phosphate adsorption was investigated at different p H by using carbon nanotubes (CNTs) as model adsorbents.The results showed that the adsorption of phosphates on carboxylated carbon nanotubes Adsorption was significantly controlled by p H, with high adsorption at low p H and low adsorption at high p H. Electrostatic interaction may be the main mechanism controlling phosphate adsorption; addition of SMX reduced the adsorption of phosphate on CNTs, Due to direct site-to-site competition; electrostatic interactions between phosphates and CNTs can be altered by charge neutralization or repulsion due to changes in SMX and phosphate morphology, resulting in SMX showing different phosphates at different p H Competitiveness.