硫酸改性生物炭对废水中Cr(Ⅵ)的吸附性能研究

Study on performance of sulfuric acid modified biochar adsorpting Cr(Ⅵ) from wastewater

利用毛竹制备的生物炭(BC)和硫酸改性生物炭(MBC)去除废水中的Cr(Ⅵ)。傅里叶变换红外光谱、扫描电子显微镜、比表面积及孔隙度分析仪的表征结果表明,改性MBC表面官能团强度和比表面积明显增加。通过静态吸附实验和循环实验研究了BC和MBC的吸附性能,在最佳吸附参数下,MBC对Cr(Ⅵ)的吸附量和去除率可达到43mg/g和99%,同时还具有良好的可回收性。BC和MBC对Cr(Ⅵ)的吸附均符合准二级动力学模型和Langmuir等温吸附模型。MBC对Cr(Ⅵ)的吸附机理以物理吸附、静电吸附和化学吸附为主。

The biochar(BC)and H_(2)SO_(4)modified biochar(MBC)were prepared by moso bamboo,and used to remove Cr(Ⅵ)in wastewater.According to the characterization analysis of FT-IR,SEM and BET,the functional group strength and specific surface area of the modified MBC were significantly improved.The adsorption performance of BC and MBC was studied by static adsorption experiments and cyclic experiments.Under the optimal adsorption parameters,the adsorption capacity and removal rate of MBC for Cr(Ⅵ)can reach 43mg/g and 99%respectively.In addition,it had good recyclability.Both BC and MBC can better fit the pseudo-second-order kinetic and Langmuir isotherm models.The adsorption mechanism of MBC to Cr(Ⅵ)was dominated by physical adsorption,electrostatic adsorption and chemical adsorption.