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,pH 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 is 4 g/L in acid solutions pH from 2 to 5 and temperature is about 30 ℃;The adsorption of Cu2+ increased at pH ≥ 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.%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Cr6+和Cu2的模拟废水.探讨了接触时间、pH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Cr6+和Cu2+时间在120 min达到平衡.在酸性条件下(pH =2 ～5),生物炭投加量为4g/L,温度为30℃时生物炭对Cr6的吸附效果较好;在偏碱性条件下(pH≥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Cr6+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.
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