CAJ | 학술논문

采用静态法用活性炭吸附处理含铅废水,考察了活性炭对含铅废水的吸附特性.结果表明:活性炭对铅离子吸附平衡时间为100 min;吸附等温方程为:C_e/q_e=0.4298+0.0594 C_e(25℃),该方程符合Langmuir型吸附模式,不同温度下吸附半衡参数0<R_L<1,表示该吸附为有利吸附.实验数据应用数学模型拟合,二级相关系数R~2=0.9998,显示吸附过程动力学与二级动力学模型相关性较好;计算不同温度下各热力学参数:△H~θ大于零、△G~θ小于零,证实该吸附过程是一个自发吸热过程.△S~θ大于零,表明铅离子在固液界面有序性减小、混乱度增大.△H~θ值很小,说明该过程为物理吸附.
채용정태법용활성탄흡부처리함연폐수,고찰료활성탄대함연폐수적흡부특성.결과표명:활성탄대연리자흡부평형시간위100 min;흡부등온방정위:C_e/q_e=0.4298+0.0594 C_e(25℃),해방정부합Langmuir형흡부모식,불동온도하흡부반형삼수0<R_L<1,표시해흡부위유리흡부.실험수거응용수학모형의합,이급상관계수R~2=0.9998,현시흡부과정동역학여이급동역학모형상관성교호;계산불동온도하각열역학삼수:△H~θ대우령、△G~θ소우령,증실해흡부과정시일개자발흡열과정.△S~θ대우령,표명연리자재고액계면유서성감소、혼란도증대.△H~θ치흔소,설명해과정위물리흡부.
Activated carbons were used to adsorb the divalent lead ions in wastewater by a static method in order to study the absorption characteristics. The results showed that the absorption equilibrium time was 100 min. The adsorption isotherm equation was C_e/q_e = 0. 4298 +0. 0594C_e ( 25 ℃) , and the equation was consistent with the Langmuir absorption model. The adsorption equation parameters ( R_L) , which were between 0 and 1 at different temperatures, proved that adsorption was beneficial to process. The experiment was well fitted by math-ematical model with the secondary correlation coefficient ( R~2 ) being 0. 9998. Meanwhile the adsorption was con-firmed as a spontaneous endothermic process by the results of △H~θ＞0 and △G~θ ＜0 at different temperatures; and the order reduced and the chaos increased of the divalent lead ions in the solid - liquid interface with △S~θ ＞ 0. In addition, small value of △H~θ showed that the absorption was a physical process.