2-线和6-线水铁矿对水中砷的吸附解吸行为研究Adsorption and Desorption of Arsenic in Water by 2-line and 6-line Ferrihydrite
霍丽娟,赵慧超,王美玲,杨改强,刘宏芳
摘要(Abstract):
研究通过吸附动力学、吸附热力学和吸附解吸实验,研究了两种晶型水铁矿对五价砷As(V)的吸附性能。结果表明,As(V)在2-线和6-线水铁矿表面的吸附可用二级动力学方程拟合,其化学反应速率K_2分别为0.077 g·(mg·h)~(-1)和0.031 g·(mg·h)~(-1).2-线水铁矿由于其无定形形态,对As(V)的吸附效果优于6-线水铁矿;热力学吸附过程符合Langmuir等温方程,拟合效果R~2均在0.98以上,吸附量随着初始浓度的增大而增加,吸附反应为放热反应,温度升高,吸附量增加;NaOH对吸附于水铁矿表面As(V)的解吸能力较强,解吸率在60%以上,解吸量与水铁矿对As(V)的吸附量、吸附剂和As(V)初始浓度有关。
关键词(KeyWords): 砷;2-线水铁矿;6-线水铁矿;吸附
基金项目(Foundation): 国家自然科学基金项目(41807130,51709195);; 山西省青年科技研究基金(201701D221222);; 太原科技大学科研启动基金(20182040,20172012)
作者(Author): 霍丽娟,赵慧超,王美玲,杨改强,刘宏芳
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