KMnO_(4)改性棉籽壳生物炭的制备及其对铅吸附研究

Preparation of KMnO_(4) modified cotton seed hull biochar and its adsorption performance for lead

以棉籽壳制备的生物炭为原始炭(BC),对其进行KMnO_(4)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Pb~(2+)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Pb~(2+)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。

Biochar prepared from cotton seed hulls was used as pristine biochar(BC),which was modified by KMnO_(4) 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+concentra-tion 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 equa-tion and the pseudo-second-order kinetic model,and the adsorption process is an endothermic process that can pro-ceed spontaneously.The experimental results of simulated wastewater showed that BC-Mn was a heavy metal adsorb-ent with good adsorption performance and practical application ability.