The objective of this study was to investigate the adsorption behaviour and the relative distribution of Cd²⁺ sorption mechanisms on biochars by different feedstock. Bamboo biochars (BBCs), corn straw biochars (CBCs) and pig manure biochars (PBCs) were prepared at 300-700 °C. Adsorption results showed PBCs have the best adsorption capacity for Cd²⁺, the extra adsorption capacity of PBCs mainly attributed to the precipitation or cation exchange, which played an important role in the removal of Cd²⁺ by PBCs. The contribution of involved Cd²⁺ removal mechanism varied with feedstock due to the different components and oxygen-containing functional groups. Cd²⁺-π interaction was the predominant mechanism for Cd²⁺ removal on biochars and the contribution proportion significantly decreased from 82.17% to 61.83% as the ash content increased from 9.40% to 58.08%. Results from this study may suggest that the application of PBC is a feasible strategy for removing metal contaminants from aqueous solutions.

本研究的目的是研究不同原料对生物炭的吸附行为和Cd ²⁺吸附机理的相对分布。在300-700°C下制备竹生物炭（BBC），玉米秸秆生物炭（CBC）和猪粪生物炭（PBC）。吸附结果表明，PBCs对Cd ²⁺的吸附能力最好，PBCs的额外吸附能力主要归因于沉淀或阳离子交换，这在PBCs去除Cd ²⁺方面起着重要作用。由于不同的组分和含氧官能团，所涉及的Cd ²⁺去除机理的贡献随原料而变化。Cd 2 ⁺ -π相互作用是Cd的主要机制随着灰分含量从9.40％增加到58.08％，生物炭中^2+的去除率和贡献率从82.17％显着降低到61.83％。这项研究的结果可能表明，PBC的应用是从水溶液中去除金属污染物的可行策略。