单宁酸对重金属离子的吸附研究

Study on the Adsorption of Tannic Acid on Heavy Metal Ions

以单宁酸为吸附剂,采用紫外光谱法分析了单宁酸对溶液中铬离子、铜离子和铁离子的吸附效果。结果表明:在0.2 mg/mL的10 mL铬离子标准溶液中加入1 mL 0.000 1 mg/mL的单宁酸,调节溶液pH为1时,静置90 min后单宁酸对铬离子吸附效果最佳,吸附率为58.18%;在0.1 mg/mL的10 mL硫酸铜溶液中加入1 mL 0.002 mg/mL的单宁酸,调节溶液pH为4时,静置60 min后单宁酸对铜离子吸附效果最佳,吸附率为23.42%;在0.000 5 mol/L的20 mL三氯化铁溶液中加入1 mL 0.5 mg/mL的单宁酸,调节溶液pH为4时,静置60 min后,单宁酸对铁离子吸附效果最佳,吸附率为97.79%。该研究为便捷、高效、低成本地除去废水中重金属离子提供参考与借鉴。

In this paper,tannic acid is used as adsorbent to study the adsorption effect of tannic acid on chromium ion,copper ion and iron ion in solution by ultraviolet-visible spectrophotometry(UV-Vis).The results show that when 1 mL of 0.000 1mg/m L tannic acid is added to the 10 mL of 0.2 mg/mL chromium solution at pH 1 standing for 90 min,the best adsorption effect of tannic acid on chromium ion is gained,and the adsorption rate is 58.18%.When 1 mL of 0.002 mg/mL tannic acid is added to 10 mL of 0.1 mg/mL copper solution at pH 4 for 60 min,the best adsorption effect of tannic acid on copper ion is gained,and the adsorption rate is 23.42%.When 1 mL of 0.5 mg/mL tannic acid is added to 20 mL of 0.000 5 mol/L ferric solution at pH 4 standing for 60 min,the best adsorption effect of tannic acid on iron ion is gained,and the adsorption rate is 97.79%.This study can provide reference for removing heavy metal ions in wastewater conveniently,efficiently and at low cost.