【摘要】 生物碳因其来源广泛、低廉及良好的表面理化性能,作为吸附材料在处理水中有机及重金属污染方面具有较大的潜力。研究利用花生壳制得生物炭,用于处理含⁶⁺和Cu²⁺的模拟废水。探讨了接触时间、p H值、生物炭投加量及温度等对吸附效果的影响。结果表明,生物碳吸附⁶⁺和Cu²⁺时间在120 min达到平衡。在酸性条件下（p H=2⁵）,生物炭投加量为4g/L,温度为30℃时生物炭对⁶⁺的吸附效果较好;在偏碱性条件下（p H≥5）,生物炭投加量为10 g/L,温度为40℃时生物炭对Cu²⁺有较好的吸附效果。通过Langmuir和Frenudlich吸附等温方程拟合,表明生物炭对⁶⁺和Cu²⁺的吸附过程更符合Frendlich模型,吸附过程可以用假二级动力学模型描述,说明吸附主要是表面化学吸附。更多还原

【Abstract】 Biochar exhibits a great potential to efficiently tackle water organic and heavy metal contaminants considering the wide availability of feedstock,low-cost and favorable physical/chemical surface characteristics. The biochar were prepared from peanut shell and its adsorption to Cr⁶⁺ and Cu²⁺ in simulation wastewater are studied.Effects of some factors on absorption properties,such as absorbing time,p H value,dosage of biochar and temperature were investigated. The results show that the time of Cr⁶⁺ and Cu²⁺ adsorption equilibrium was 120 min.listed. The biochar had a good effect on treatment of Cr⁶⁺ under the conditions as followed: the dosage of biochar is4 g/L in acid solutions p H from 2 to 5 and temperature is about 30 ℃; The adsorption of Cu²⁺ increased at p H≥5,the dosage of biochar is 10 g/L,and the temperature is about 40 ℃. Besides,adsorption isotherms on the biochar were simulated with the Langmuir and Freundlich equations,and the adsorption isotherms followed well the Freundlich model,and processes fitted pseudo second-order model. So,the adsorption belongs to the surface chemical adsorption.更多还原