To reduce pollution and simultaneously mitigate carbon emission. Biochar samples were prepared via the pyrolysis of sludge after conditioning with K₂FeO₄ and cationic polyacrylamide (CPAM) or chitosan (CTS), and their CO₂ capture performance was compared. The optimal preparation conditions were 600 °C and 80 mg/g dry solid (DS) for K₂FeO₄, 20 mg/L for CPAM, and 1 mg/g DS for CTS. The results showed that the CO₂ capture capacity of the biochar with K₂FeO₄ (K₂FeO₄-B) increased from 75.69 mg/g to 81.68 mg/g compared to RSB, the CO₂ capture capacity of the biochar with PF+CPAM (K₂FeO₄-CPAM-B) was 94.81mg/g, and the CO₂ capture capacity of the biochar with PF+CTS (K₂FeO₄-CTS-B) was 86.56 mg/g. The CO₂ capture capacity of the biochar (K₂FeO₄-CTS-B) was 86.56 mg/g. The main reason for this improved capacity is that the addition of K₂FeO₄ and CPAM enhanced chemical properties of the biochar surface (carbon content, N–H content, etc.). Additionally, the biochar conditioned with K₂FeO₄ and CPAM demonstrated better cyclic adsorption performance and economic efficiency than the other samples. It has the prospect of engineering application. This study provides a reference for the selection of conditioning agents for wastewater treatment plants and a new solution for sludge disposal.

减少污染，同时减少碳排放。_{在用K 2} FeO ₄和阳离子聚丙烯酰胺（CPAM）或壳聚糖（CTS）调节后，通过热解污泥制备生物炭样品，并比较了它们的CO _{2捕获性能。}最佳制备条件为 600 °C 和 80 mg/g 干燥固体 (DS) K ₂ FeO ₄、20 mg/L CPAM 和 1 mg/g DS 用于 CTS。结果表明，与RSB相比，K ₂ FeO ₄ (K ₂ FeO ₄ -B)生物炭的CO _{2捕获能力从75.69 mg/g增加到81.68 mg/g，CO 2PF+CPAM（K 2} FeO ₄ -CPAM-B）生物炭的捕集能力为94.81mg/g，PF+CTS（K ₂ FeO ₄ -CTS-B）生物炭的CO ₂捕集能力为86.56毫克/克。生物炭（K ₂ FeO ₄ -CTS-B）的CO ₂捕获能力为86.56 mg/g。这种容量提高的主要原因是添加 K ₂ FeO ₄和 CPAM 增强了生物炭表面的化学性质（碳含量、N-H 含量等）。_{此外，用 K 2} FeO ₄调节的生物炭CPAM表现出比其他样品更好的循环吸附性能和经济效益。具有工程应用前景。该研究为污水处理厂调理剂的选择提供了参考，为污泥处置提供了新的解决方案。