Biochar is produced at 400–800 °C by pyrolysis of poplar saw dust, which is used as the sustainable adsorbent to investigate the adsorption performance of Pb²⁺/Cd²⁺ from wastewater. The adsorption kinetics and isotherms of Pb²⁺/Cd²⁺ on biochar were determined. The maximum adsorption amount of Pb²⁺ is 62.68 mg/g, while that of Cd²⁺ is 49.32 mg/g at pH of 5 based on Langmuir equation. The Cd²⁺ adsorption was seriously inhibited, while the uptake of Pb(II) was not significantly affected in the multimetal system. The adsorption performance of Pb²⁺/Cd²⁺ was also investigated in different water systems. Mineral precipitation with Pb²⁺ is predominant mechanism for Pb²⁺ removal with the contribution proportion of 51.76%. Coordination with π electrons is the primary mechanism for Cd²⁺ adsorption, at 59.36% of the total adsorption capacity. Our findings provide a successful example of poplar saw dust converting into the sustainable adsorbent for Pb²⁺/Cd²⁺ removal from wastewater to implement the concept of “clean production”, which is worthy of further study.

Biochar 是在 400–800 °C 下通过杨木锯末热解生产的，用作可持续吸附剂来研究废水中 Pb ²⁺ /Cd ²⁺的吸附性能。测定了生物炭上Pb ²⁺ /Cd ²⁺的吸附动力学和等温线。根据朗缪尔方程，在pH值为5时，Pb ²⁺的最大吸附量为62.68 mg/g，而Cd ²⁺的最大吸附量为49.32 mg/g。Cd ²⁺吸附受到严重抑制，而多金属体系中Pb(II)的吸收没有显着影响。Pb ²⁺ /Cd ²⁺的吸附性能还在不同的水系统中进行了研究。矿物沉淀与铅²⁺是铅主要机制²⁺去除以51.76％的出资比例。与 π 电子的配位是 Cd ²⁺吸附的主要机制，占总吸附容量的 59.36%。我们的研究结果为杨木锯末转化为可持续吸附剂去除废水中的Pb ²⁺ /Cd ²⁺以实现“清洁生产”的概念提供了一个成功的例子，值得进一步研究。