竹炭对水溶液中Cu(Ⅱ)、Cd(Ⅱ)的吸附性能研究

Adsorption behavior of the bamboo-charcoal for copper(Ⅱ) and cadmium(Ⅱ) in aqueous solution

研究了竹炭对溶液中Cu2+、Cd2+的吸附性能,考察了吸附时间、溶液pH值、吸附温度和溶液初始浓度对吸附效果的影响,同时研究了活性炭对Cu2+、Cd2+的吸附性能。结果表明,竹炭能有效吸附水溶液中的Cu2+、Cd2+,且单位吸附量均随时间的延长而增加,均在14 h左右达到平衡,吸附速度快于活性炭;相同pH值条件下,竹炭的单位吸附量明显高于活性炭,吸附效果最佳的pH值分别为3.8左右和7.5左右;当吸附温度为15,25,45℃时,竹炭对Cu2+的最大吸附量分别为4.13,4.45,4.23 mg/g,而竹炭对Cd2+的最大吸附量分别为0.81,1.05,2.01 mg/g。竹炭对Cu2+、Cd2+的吸附均符合Freundlich方程和Langmuir方程。

The adsorption of Cu2＋ and Cd2＋ from aqueous single metal solutions by the bamboo-charcoal was studied.The results showed that,Cu2＋ and Cd2＋ was quickly adsorbed by the adsorbent,the adsorption equilibration time of Cu2＋ and Cd2＋ were all about 14 h.The best adsorption pH was about 3.8 for Cu2＋,and 7.5 for Cd2＋.The maximal adsorptive capacity was increased with increasing temperature.When adsorption temperature were 15,25,45 ℃,the maximal adsorptive capacity of Cu2＋ was 4.13,4.45,4.23 mg/g,while the maximal adsorptive capacity of Cd2＋ was 0.81,1.05,2.01 mg/g,respectively.Langmuir and Freundlich equations can be used to fit the adsorption isotherm of Cu2＋ and Cd2＋.