黄芩废渣生物质炭对盐酸四环素的吸附性能研究

Adsorption Properties of Scutellaria Residue Biochar on Tetracycline Hydrochloride

以黄芩废渣为原料制备生物质炭,吸附水中盐酸四环素(TC)。考察溶液pH值、TC浓度、吸附时间和温度对吸附效果的影响。实验表明,pH值对吸附有显著影响,随着溶液pH值增加生物质炭对TC的吸附量先增大后减小。吸附等温线、动力学和热力学研究表明吸附以疏水作用为动力,以单分子层吸附为主,吸附速率受表面扩散和内扩散混合控制,属于自发的吸热过程。

The biochar was prepared using the scutellaria residue and then its adsorption on Tetracycline hydrochloride(TC)in water was investigated.The effect of pH,TC concentration,time and temperature on the adsorption capacity was systematically examined.The experimental results indicated that the adsorption of the Scutellaria residue biochar on TC was dramatically affected by the pH value.With the increase of pH value,the adsorption capacity of biochar on TC first increased and then decreased.The adsorption isotherms,kinetics and thermodynamics studies show that the adsorption was driven by hydrophobic interaction and dominated by monolayer adsorption,while the rate was controlled by the surface diffusion and internal diffusion together,and the adsorption was a spontaneous endothermic reaction.