成型膨润土和钛柱撑膨润土对水中Pb^(2+)和氯乙酸吸附及再生

Sorption of Pb^(2+) and chloroactic in solution on molding bentonite and molding Ti-pillared bentonite and their regeneration

针对水中微量铅离子和氯乙酸的脱除,考察了成型膨润土及成型钛柱撑膨润土的吸附性能,得出对铅离子的吸附,成型膨润土、成型钛柱撑膨润土与粉末状活性炭性能相当,而对氯乙酸的吸附前两者要比粉末状活性炭低好多。确定了成型膨润土吸附氯乙酸后可用沸水煮沸30 min的方法再生,成型钛柱撑膨润土吸附氯乙酸后,可用500℃焙烧3 h的方法再生,再生的膨润土循环使用3次后性能降低明显。此外,还测得了成型的膨润土及成型的钛柱撑膨润土吸附铅离子和氯乙酸的等温线,计算出其对铅的最大吸附量分别为24.33 mg/g和15.47 mg/g。

In view of the removal of small lead ionic and chloroactic in solution, the adsorption of molding bentonite and molding Ti-pillared bentonite are determined. It is concluded that the adsorption capability of molding Ti-pillared bentonite is equal to active carbon for lead ionic, their adsorption capability for chloroactic is much lower than active carbon. The regeneration mehod of molding benotine is that after adsorption chloroactic is boiled in water for 30 minutes. The regeneration mehod of molding Ti-pillared bentonite is that it is canclined at 500℃ for 3 h. The regenerative molding Ti-pillared bentonite can be used three times and their adsorption capability is reduced significantly after three times. Moreover, the sorption isotherm for chloroacetic acid and lead ionic on molding bentonite and molding Ti-pillared bentonite are determined, the max adsorption mass for lead ionic are 24. 33 mg/g and 15.47 mg/g separatively.