【摘要】 该文以猪粪为原料，采用水热炭化法制备猪粪水热炭（HC）并用氯化铁溶液进行磁化改性得到磁性水热炭（MHC）。通过傅里叶红外光谱分析、扫描电镜、比表面积和孔径分析、Zeta电位分析等方法对改性前后生物炭的结构和性质进行了表征，并研究了吸附剂投加量、初始p H、吸附时间、共存离子对HC和MHC吸附水中Cr(Ⅵ)的影响。结果表明，MHC的比表面积、孔体积和含氧官能团含量都显著增加，吸附位点增多。当投加量为4 g/L,溶液初始p H为2时，MHC对50 mg/L Cr(Ⅵ)的最大吸附量分别为12.32 mg/g，去除率为98.76%,MHC对Cr(Ⅵ)的吸附能力明显提高。Langmuir和Freundlich等温吸附方程均可较好描述MHC对Cr(Ⅵ)的吸附特性，且Langmuir吸附模型更好，吸附过程更符合准二级吸附动力学方程。共存离子在浓度不高时对吸附过程影响有限。更多还原

【Abstract】 Using pig manure as raw material, pig manure hydrothermal carbon(HC) was prepared by hydrothermal carbonization method and magnetized with iron chloride solution to obtain magnetic hydrothermal carbon(MHC). The structure and properties of biochar before and after modification were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, specific surface area and pore size analysis, and the effects of adsorbent dosage, initial pH, adsorption time, coexisting ions on the adsorption of Cr(Ⅵ) in water by HC and MHC were studied. The results showed that the specific surface area, pore volume, and oxygen-containing functional group content of MHC significantly increased, and the adsorption sites increased. When the dosage is 4 g/L and the initial pH of the solution is 2, the maximum adsorption capacity of MHC for 50 mg/L Cr(Ⅵ) is 12.32 mg/g, and the removal rate is 98.76%. The adsorption capacity of MHC for Cr(Ⅵ) is significantly improved. The Langmuir and Freundlich isotherm adsorption equations can better describe the adsorption characteristics of MHC for Cr(Ⅵ), and the Langmuir adsorption model is better, and the adsorption process is more in line with the quasi second-order adsorption kinetics equation. Coexisting ions have limited impact on the adsorption process at low concentrations.更多还原