【摘要】 采用酸碱、MgCl₂/FeCl₃混合溶液两种方法对椰壳生物炭进行改性,设置不同盐度、温度、pH、腐殖酸、反应时间等理化条件,研究改性椰壳生物炭吸附苯酚的效应,并进行吸附动力学研究。结果表明,两种改性椰壳生物炭对水体中苯酚的吸附效果均比未改性好,吸附速率更快。盐度和温度升高均可促进生物炭对水体中苯酚的吸附;pH在2～11范围内变化,生物炭对苯酚的吸附量先增后降;腐殖酸对吸附影响不大。改性生物炭吸附苯酚废水的最佳理化条件为:盐度5%,温度30℃,pH为酸性或中性。吸附动力学分析结果表明伪二级动力学模型能更好拟合改性椰壳生物炭对苯酚的吸附。更多还原

【Abstract】 Two methods of acid-base and MgCl₂/Fe Cl₃ mixed solution were used to modify coconut shell biochar. By setting different salinity, temperature, pH, humic acid, reaction time and other physical and chemical conditions, the adsorption effect of the modified coconut shell biochar to phenol and its adsorption kinetics were studied. The results showed that two kinds of modified coconut shell biochar had better adsorption effect on phenol in water, and the adsorption rate was faster. Both salinity and temperature increase can promote the adsorption of phenol in water by biochar. In the range of pH 2～11, the adsorption capacity of biochar for phenol first increased and then decreased. Humic acid had little effect on adsorption. The optimal physical and chemical conditions for modified biochar to adsorb phenol wastewater were: salinity 5 %, temperature 30 ℃, pH was acidic or neutral. The results of adsorption kinetic analysis showed that the pseudo-second-order kinetic model could better fit the adsorption of phenol on the modified coconut shell biochar.更多还原