School of Resources and Civil Engineering, Northeastern University, Shenyang, China.
Shenyang Ecological Environment Affairs Service Center Heping Branch Center, Shenyang, China.
Microsc Res Tech. 2022 Nov;85(11):3589-3599. doi: 10.1002/jemt.24210. Epub 2022 Jul 23.
The pollution of lead (Pb (II)) to water resources is becoming more and more serious. It is always a difficult problem to find efficient and low-cost adsorbents. Chicken manure (CM) and Chinese medicine residue (CMR) were modified with potassium dihydrogen phosphate (KH PO ) and pyrolyzed to obtain a modified material (PBC) for the treatment of Pb(II) in an aqueous solution. A variety of characterization analysis results could prove that KH PO was successfully introduced to PBC. By adjusting the initial pH, the zeta potential of PBC varies from -3.2 to -43.1 mV, it could be seen that PBC had excellent applicability in the broad range pH value (1.0-6.0). Experimental and model results showed that R of the pseudo-first order kinetic model and the pseudo-second order kinetic model are greater than 0.99, indicating that that physical and chemical adsorption played a significant role in Pb(II) removal by PBC. An adsorption isotherm analysis showed that the adsorption capacity n in this study is greater than 1, confirming that PBC has a good adsorption effect on Pb (II). R of the Langmuir model of PBC is 0.981, and its maximum adsorption capacity of Pb(II) could reach 599.4 mg/g. Environmentally friendly PBC could be used as an effective adsorbent to remove Pb(II) from aqueous systems. RESEARCH HIGHLIGHTS: Chicken manure and Chinese medicine residue were converted into biochar to improve utilization. The modified biochar exhibited extraordinary Pb(II) adsorption capacity. Adsorption mechanisms: Surface complexation, ions exchange, coprecipitation, and so on. Remained great Pb(II) removal efficiency at different pH and Pb(II) concentration.
水体中铅（Pb (II)）污染日益严重，寻找高效、低成本的吸附剂一直是一个难题。本研究采用磷酸二氢钾（KH PO ）对鸡粪（CM）和中药渣（CMR）进行改性并热解，得到一种用于处理水溶液中 Pb(II)的改性材料（PBC）。通过多种表征分析结果证明，KH PO 成功地引入到 PBC 中。通过调节初始 pH 值，PBC 的动电电位从-3.2 到-43.1 mV 变化，表明 PBC 在较宽的 pH 值范围（1.0-6.0）内具有优异的适用性。实验和模型结果表明，伪一级动力学模型和伪二级动力学模型的 R 值均大于 0.99，表明物理和化学吸附在 PBC 去除 Pb(II)中起重要作用。吸附等温线分析表明，本研究中的 n 值大于 1，证实 PBC 对 Pb (II)具有良好的吸附效果。PBC 的 Langmuir 模型 R 为 0.981，其对 Pb(II)的最大吸附容量可达 599.4 mg/g。环境友好型 PBC 可作为一种有效的吸附剂，从水体系中去除 Pb(II)。研究亮点：鸡粪和中药渣转化为生物炭以提高利用率。改性生物炭表现出非凡的 Pb(II)吸附能力。吸附机制：表面络合、离子交换、共沉淀等。在不同 pH 值和 Pb(II)浓度下仍保持较高的 Pb(II)去除效率。
