摘要：

采用大蒜茎叶为原料,经异丙醇、氢氧化钠和柠檬酸处理,制备出改性吸附剂并用于吸附Pb(Ⅱ)的实验。考察了溶液酸度、吸附平衡时间、最大吸附量、固液比等因素对金属离子吸附平衡的影响。结果表明: 改性剂柠檬酸最佳浓度为0.6 mol/L,最佳的制备温度是80 ℃。经柠檬酸改性的大蒜茎叶吸附剂对Pb²⁺的最佳吸附pH=5,在120 min内建立了反应平衡,对Pb²⁺的最大吸附量是119.62 mg/g。

关键词: 大蒜茎叶, 改性, 铅

Abstract:

Modified adsorbent has been prepared with garlic stems & leaves as raw materials, which were treated with C₃H₈O, NaOH, and C₆H₆O₇·H₂O, and has been applied to the adsorption for Pb(Ⅱ). The influences of the factors, such as initial pH, adsorption equilibrium time, maximum adsorption capacity, solid/liquid ratio, etc. on the adsorption equilibrium of metal ions are investigated. The results show that the optimal concentration of modifier citric acid is 0.6 mol/L, and optimal preparation temperature 80 ℃. The optimal conditions for adsorbing Pb²⁺ by the citric acid-modified garlic stems & leaves adsorbent are as follows: pH is 5 and adsorption time within 120 min. Thus, the reaction equilibrium can be established and the maximum adsorbing capacity for Pb²⁺ is 119.62 mg/g.

Key words: garlic stem &, leaves, modification, lead

中图分类号: 

• X703.5