Mesoporous composite activated carbon (AC) prepared from cocoa (Theobroma cacao) pod and sunflower (Tithonia diversifolia) stalk were evaluated for the sorption of Pb(II) and Fe(II) from wastewater. The different biomasses were acid activated by wet impregnation with phosphoric acid and carbonised at 500 °C. Adsorbents studied were AC from Theobroma cacao (TC-AC) and Theobroma-Tithonia blend (TT-AC) in a mass ratio of 75–25 wt%. The adsorbent was characterised by FTIR, BET and SEM–EDS. The specific surface areas were 237.445 and 392.508 m²/g for TC-AC and TT-AC respectively. Parametric studies revealed that adsorbate uptake reduced with increased initial concentration and increased with increasing dosage and contact time. The monolayer adsorption capacities for Pb(II) sorption onto TC-AC and TT-AC were 47.17 and 46.95 mg/g and for Fe(II) sorption onto TC-AC and TT-AC was 37.45 and 37.04 mg/g respectively. Langmuir isotherm and pseudo-second-order kinetic models were the best fits for the adsorption process. From the study, it has been observed that high-quality mesoporous adsorbent can be obtained from the carbonisation of the cocoa pod and sunflower stalk for water treatment applications.

评估了由可可 ( Theobroma cacao ) 豆荚和向日葵 ( Tithonia diversifolia ) 茎制备的介孔复合活性炭 (AC ) 从废水中吸附 Pb(II) 和 Fe(II)。不同的生物质通过用磷酸湿浸渍进行酸活化，并在 500 °C 下碳化。所研究的吸附剂是来自可可可可(TC-AC) 的 AC 和质量比为 75-25 重量％的可可-Tithonia混合物 (TT-AC)。吸附剂通过 FTIR、BET 和 SEM-EDS 进行表征。比表面积分别为 237.445 和 392.508 m ²/g 分别代表 TC-AC 和 TT-AC。参数研究表明，吸附物吸收随着初始浓度的增加而减少，并随着剂量和接触时间的增加而增加。Pb(II) 吸附到 TC-AC 和 TT-AC 上的单层吸附容量分别为 47.17 和 46.95 mg/g，Fe(II) 吸附到 TC-AC 和 TT-AC 上的单层吸附容量分别为 37.45 和 37.04 mg/g。Langmuir 等温线和准二级动力学模型最适合吸附过程。从研究中可以看出，可可豆荚和向日葵茎的碳化可以获得高质量的介孔吸附剂，用于水处理应用。