麦秆黄原酸酯对水中Cu(II)的吸附

Adsorption of Cu(II) in water by straw xanthate

采用农业废弃物麦秆为原料制备黄原酸酯,通过傅立叶变换红外光谱FT-IR、扫描电子显微镜SEM等技术对麦秆黄原酸酯物理化学性质进行表征,并对水中Cu2+进行吸附特性研究,考察了不同条件对Cu2+吸附效果的影响,并将其应用于跌水式吸附法对含重金属沼液进行处理,为麦秆黄原酸酯应用于实际污水处理提供理论参考。结果表明,麦秆黄原酸酯对Cu2+的吸附行为符合伪二级动力学吸附模型与Langmuir等温吸附方程,298 K时,Cu2+的饱和吸附量为28.33 mg/g,溶出率为4.97%,对Cu2+的固持能力较强;黄原酸酯跌水吸附法对于含量为50 mg/L以下的Cu2+废水去除率达到80%以上,对实际沼液中Pb、Zn、Cd、Cu的去除率为44.42%~90.16%,去除顺序为Cd>Pb>Cu>Zn。

Straw xanthate was prepared by wheat straw as raw material. The material was characterized by FTIR spectroscopy,SEM and EDS. Adsorption of Cu2 +to straw xanthate in aqueous solution and application of a drop water process to remove the heavy metals from biogas slurry were investigated to provide useful information in predicting the adsorption behavior in practical wastewater treatment. The results show that adsorption data fitted satisfactorily with the pseudo-second order kinetic equation and Langmuir Isotherm. At 298 K,the maximum adsorption equilibrium amount was 28. 33 mg /g,only 4. 97% of the adsorbate redissolved after high speed oscillation. The drop water adsorption process achieved the elimination of Cu2 +from low concentration wastewater( <50 mg /L) with significant reduction( > 80%),and the removal rate of Pb,Zn,Cd,Cu from the biogas slurry was from 44. 42% to 90. 16%( Zn < Cu < Pb < Cd).