摘要：

以棉籽壳制备的生物炭为原始炭（BC），对其进行KMnO₄改性，制得改性生物炭（BC-Mn），并通过实验研究了BC-Mn对水中铅的吸附性能。结果表明：BC-Mn具有较大的比表面积和丰富的孔径结构。当初始Pb²⁺质量浓度为300 mg/L，pH=5，吸附剂投加量为2 g/L时，吸附效果最佳，最大吸附量可达到126.79 mg/g。BC-Mn对Pb²⁺的吸附符合Langmuir等温方程和拟二级动力学模型，且该吸附过程是可以自发进行的吸热过程。模拟废水实验结果表明，BC-Mn是一种吸附性能良好且具有实际应用价值的重金属吸附剂。

关键词: 棉籽壳, 生物炭, 铅, 吸附性能

Abstract:

Biochar prepared from cotton seed hulls was used as pristine biochar(BC), which was modified by KMnO₄ to prepare modified biochar(BC-Mn), and the adsorption performance of BC-Mn on lead in water was studied. The results showed that BC-Mn had a large specific surface area and rich pore structure. When the initial Pb²⁺ concentration was 300 mg/L, pH=5, and the adsorbent dosage was 2 g/L, the adsorption effect was the best, and the maximum adsorption capacity reached 126.79 mg/g. The adsorption of Pb²⁺ by BC-Mn conforms to the Langmuir isotherm equation and the pseudo-second-order kinetic model, and the adsorption process is an endothermic process that can proceed spontaneously. The experimental results of simulated wastewater showed that BC-Mn was a heavy metal adsorbent with good adsorption performance and practical application ability.

Key words: cotton seed hull, biochar, lead, adsorption properties

中图分类号: 

• X703