两性磁化炭添加比例对河流沿岸土吸附Cu2+的影响

将两性(十二烷基二甲基甜菜碱)修饰磁化炭分别以质量分数0、1%和2%加入嘉陵江流域(川渝段)内苍溪(CX)、南部(NB)、嘉陵(JL)和合川(HC)沿岸土中,考察各混合土样对Cu^2+的等温吸附和热力学特征。结果表明:混合土样对Cu^2+的最大吸附量为58.36 mmol/kg~366.85 mmol/kg,添加等量两性磁化炭时各混合土样对Cu^2+吸附量表现为JL>NB>CX>HC的趋势,且添加比越高吸附能力越强。各混合土样对Cu^2+的吸附为自发、吸热和熵增的反应过程,对Cu^2+的吸附量与温度和pH值均呈正相关关系。当离子强度为0.1 mol/L时,各混合土样(除HC外)对Cu^2+的吸附量最大。

Effect of Amphoteric-Magnetized Biochar Addition Ratio on Cu^2+Adsorption in Riverbank Soils

Amphoteric(dodecyl dimethyl betaine)modified magnetized biochar was added into the riverbank soils in Cangxi(CX),Nanbu(NB),Jialing(JL)and Hechuan(HC)along the Jialing River by 0,1%and 2%mass ratio.The adsorption isotherms and thermodynamic characteristics of Cu^2+in each mixed soil sample were studied.The results indicated that the maximum Cu^2+adsorption amount in mixed soil samples were between 58.36 mmol/kg and 366.85 mmol/kg.Cu^2+adsorption had a trend of JL>NB>CX>HC when adding equivalent amphoteric magnetized biochar to each mixed soil sample.The adsorption capacity increased as the addition ratio increased.The adsorption of Cu^2+in each mixed soil sample was a spontaneous,endothermic and entropy increase reaction process.Cu^2+adsorption was positively correlated with temperature and pH value.When ion strength was 0.1 mol/L,the adsorption amount of Cu^2+in each mixed sample(except HC)was the largest.