Production of biochar is accomplished by pyrolysis of corncobs at 350 °C (BC-350) and 450 °C (BC-450) under oxygen-limited conditions. The chemical and physical properties were investigated via XRD, FTIR, BET, SEM and EDX analysis. Batch experiments were conducted for the adsorption of Pb²⁺ ions from aqueous solution onto biochar with regards to pH, contact time, biochar dose and initial Pb²⁺ concentration. The adsorption efficiency of Pb²⁺ was increased as increasing pH and biochar dose up to 1.5 g/L. Kinetic and isothermal studies demonstrated that the experimental data were fitted with the pseudo-second-order model, Langmuir and Freundlich isotherms. The study emphasized the preferable pyrolysis temperature which is 450 °C. According to the Dubinin-Kaganer-Radushkevich (DKR) model, the adsorption process of Pb²⁺ was a chemical and endothermic reaction. Results showed the applicability of corncob based biochar to be used as an efficient and low cost adsorbent for Pb²⁺ ions removal.

生物炭的生产是通过在氧气受限的条件下，将玉米芯在350°C（BC-350）和450°C（BC-450）上热解来完成的。通过XRD，FTIR，BET，SEM和EDX分析研究了化学和物理性质。关于pH，接触时间，生物炭剂量和初始Pb ²⁺浓度，进行了分批实验以从水溶液中吸附Pb ²⁺离子到生物炭上。Pb ²⁺的吸附效率随着pH和生物炭剂量增加至1.5 g / L而增加。动力学和等温研究表明，实验数据符合拟二阶模型，Langmuir和Freundlich等温线。研究强调了优选的热解温度为450°C。根据Dubinin-Kaganer-Radushkevich（DKR）模型，Pb ²⁺的吸附过程是化学反应和吸热反应。结果表明，基于玉米芯的生物炭可用作去除Pb ²⁺离子的高效低成本吸附剂。