模拟酸雨对巯基化膨润土吸附Pb~(2+)的解吸研究

比较了巯基改性膨润土(TMB)和钙基膨润土(RB)对水溶液中铅的固定性能,考察了模拟酸雨pH值、离子强度、解吸温度和时间等条件对其解吸Pb~(2+)的影响。结果表明:在吸附条件一致的前提下,模拟酸雨p H值与铅的解吸量呈负相关性;模拟酸雨离子强度、解吸时间和解吸温度对钙基膨润土吸附铅的解吸影响较大,而对巯基改性膨润土吸附铅的解吸无影响,解吸率为0%。在20℃、30℃、40℃、50℃下,模拟酸雨对铅在巯基化膨润土上的平衡解吸量分别为39.52 mg/g、23.20 mg/g、21.74 mg/g和17.86 mg/g,表明该巯基改性膨润土对铅具有很强的固定能力。

Study on Desorption of Pb2+ on Thiol-Modified Bentonite by Stimulant Acid Rain

Thiol-modified bentonite as a adsorbent was synthesized, and the desorption capacity of Pb2+ on thiol-modified bentonite(TMB) and Ca- bentonite(RB)was studied using batch technique under a function of contact time, pH, the amount of adsorbent, KNO3 ionic strength and temperature of stimulant acid rain. The results showed that keep the condition of adsorption conditions consistent, the pH value of stimulant acid rain with the desorption amount of lead was significantly negative correlation; the pH value, ionic strength, desorption time and the desorption temperature of stimulant acid rain had stronger influence on desorption of Pb2+ on Ca- bentonite, then that had little influence on desorption of Pb2+ on thiol-modified bentonite, the desorption rate was 0%. At 20 ℃, 30 ℃, 40 ℃ and 50 ℃, The saturated desorption capacity of Thiol-modified bentonite were 39.52 mg/g, 23.20 mg/g, 21.74 mg/g and 17.86 mg/g, the results showed that thiol-modified bentonite has a strong adsorption and fixation capacity for Pb2+.