Developing efficient nitrate removal technologies is crucial for ensuring the safety of drinking water, a polypyrrole-grafted activated carbon (PPy-AC) was synthesized via in situ chemical oxidative polymerization to enhance nitrate adsorption from water. It was showed that the PPy-AC composite featured a maximum adsorption capacity of 13.36 mg NO₃⁻-N/g and exhibited high selectivity toward nitrate in the presence of co-existing anions. The PPy-AC composite exhibited a considerable capacity for adsorbing nitrate over a wide pH range of 3.0–9.0. The absorption performances were well-fitted by the Redlich-Peterson isotherm model, and the adsorption kinetics were well-described by the pseudo-second-order equation. Furthermore, the mass and charge balance calculations showed that 8.4% of the nitrogen atoms in the PPy-AC facilitated the adsorption of nitrate. The mechanisms of nitrate removal by the PPy-AC composite were determined through the electrostatic attraction and ion-exchange process, in which the nitrate ions are replaced by doped chloride ions, and the other N⁺ sites in PPy were occupied by nitrate ions. The PPy-AC is a promising material for the nitrate removal from wastewater.

开发高效的硝酸盐去除技术对于确保饮用水安全至关重要，通过原位化学氧化聚合合成了聚吡咯接枝活性炭（PPy-AC），以增强水中硝酸盐的吸附。结果表明，PPy-AC复合材料的最大吸附容量为13.36 mg NO ₃ ⁻-N/g，并且在共存阴离子存在下对硝酸盐表现出高选择性。PPy-AC 复合材料在 3.0-9.0 的宽 pH 范围内表现出相当大的硝酸盐吸附能力。Redlich-Peterson 等温线模型很好地拟合了吸附性能，伪二阶方程很好地描述了吸附动力学。此外，质荷平衡计算表明，PPy-AC 中 8.4% 的氮原子有利于硝酸盐的吸附。PPy-AC复合材料去除硝酸盐的机理通过静电吸引和离子交换过程确定，其中硝酸根离子被掺杂的氯离子取代，而其他N ⁺PPy 中的位点被硝酸根离子占据。PPy-AC 是一种很有前景的去除废水中硝酸盐的材料。