氢氧化镁改性活性炭对铜离子的吸附

Adsorption of Copper Ions by Magnesium Hydroxide Modified Activated Carbon

摘要:

采用反应结晶技术制备了改性活性炭材料(Mg-GAC)，并采用 SEM、XRD表征手段对改性前后活性炭进行微观分析，进而研究了 GAC 和 Mg-GAC随吸附时间、溶液pH值和温度变化对废水中铜离子的吸附效果影响。结果表明，GAC经改性后，大大增加了其比表面积，增至738.01m2/g。在Mg-GAC 投加量为0.3g，铜离子浓度为40mg/L，温度为25℃，pH为7的条件下反应2 h，其吸附量达到11.66mg/g。另外，铜离子的吸附过程符合 Langmuir 等温模型。

Abstract:

The modified activated carbon material (Mg-GAC) was prepared by reactive crystallization technique. The microstructure of the activated carbon before and after modification was analyzed by SEM and XRD. The adsorption time, pH value and temperature of GAC and Mg-GAC were studied. The effect of adsorption of copper ions in wastewater. The results show that the modified GAC greatly increases its specific surface area and increases to 738.01m2/g. When the dosage of Mg-GAC was 0.3g, the concentration of copper ion was 40mg/L, the temperature was 25 ℃, and the pH was 7 for 2 h, the adsorption amount reached 11.66mg/g. In addition, the adsorption process of copper ions conforms to the Langmuir isotherm model.