论文部分内容阅读
以马铃薯茎叶为原料,采用限氧裂解法制备生物炭,通过H2SO4和KOH处理制备酸、碱改性生物炭.应用比表面积法(BET)、扫描电镜(SEM)和红外光谱(FTIR)研究了改性前后3种生物炭的结构与性质,并通过单因素实验研究了吸附时间、温度、磺胺噻唑初始浓度、p H值等因素对原始及酸碱改性3种生物炭吸附磺胺噻唑效果的影响,初步探讨了吸附机制.结果表明,3种生物炭对磺胺噻唑的吸附行为符合准二级动力学方程;酸改性生物炭对磺胺噻唑的吸附等温线符合Temkin模型,原炭和碱改性生物炭的吸附等温曲线符合Freundlich模型.酸改性极大的提高了生物炭对磺胺噻唑的吸附能力,最大吸附量为7.69 mg·g-1,是原炭吸附量的2.4倍;溶液p H对3种生物炭吸附磺胺噻唑影响不明显.热力学研究表明,酸改性生物炭对磺胺噻唑的吸附为自发的吸热反应.FTIR分析表明,酸改性生物炭表面有更多含氧官能团,为磺胺噻唑的吸附提供了吸附点.氢键、范德华力及偶极距力作用对生物炭吸附磺胺噻唑起到主要作用.
Biochar was prepared from the stems and leaves of potato using oxygen-limited pyrolysis method and acid-base modified biochar was prepared by H2SO4 and KOH treatment. The surface area (BET), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) The structure and properties of three kinds of biochar before and after modification were studied. The effects of adsorption time, temperature, initial concentration of sulfathiazole and p H value on the adsorption of sulfathiazole by the three kinds of biochar were studied by single factor experiment The adsorption mechanism of sulfathiazole was investigated by three kinds of biochars.The adsorption isotherms of sulfathiazole were in accordance with the Temkin model, The adsorption isotherm curve of modified biochar accords with Freundlich model.Acid modification greatly enhanced the adsorption capacity of biochar to sulfathiazole with the maximum adsorption capacity of 7.69 mg · g-1, which is 2.4 times of the original carbon adsorption capacity. The solution p H had no obvious effect on the adsorption of sulfathiazole on the three kinds of biochar.The thermodynamic studies showed that the adsorption of sulfathiazole by acid-modified biochar was spontaneous endothermic reaction.FTIR analysis showed that there were more oxygen official Group, provided the point of adsorption of the adsorption Sulfathiazole hydrogen bonds, van der Waals forces, and dipole moment in biological carbon adsorption Sulfathiazole play a major role.