摘要
以绿毛藻、螺旋藻、小球藻等三种淡水藻为吸附剂,通过改变吸附时间(0.5 h～6.0 h)、初始pH(3.0～11.0)、吸附剂用量(0.05 g～0.30 g)以及Na+质量浓度(0 mg/L～120 mg/L),考察其对溶液中Pb^(2+)(50 mg/L)的吸附效果,并利用吸附等温线拟合对其吸附动力学模型进行了初步探究。结果表明,随着吸附时间的增加,吸附会达到平衡,而后出现解吸的现象;在偏酸性的条件下这三种藻类对Pb^(2+)的吸附效果较好;当吸附达到平衡后再增加吸附剂的用量会降低单位质量吸附剂的吸附能力;Na^+浓度对吸附效果也有极大的影响。吸附等温线表明这三种藻类吸附剂的吸附均符合Langmuir模型,依据该模型得到其对Pb^(2+)的饱和吸附量分别为27.50 mg/g、21.00 mg/g和25.85 mg/g。这三种藻类对Pb^(2+)均有较好的吸附效果,且廉价易得,在处理重金属污染上将有一定的应用前景。
The adsorption behaviors of three kinds of freshwater algae such as green algae,spirulina and chlorella for Pb2+(50 mg/L)in solution were investigated by changing the adsorption time(0.5 h-6.0 h),initial pH(3.0-11.0),adsorbent dosage(0.05 g-0.3 g)and ionic strength(0 mg/L-120 mg/L). And the adsorptionkinetics model was preliminary investigated by fitting the adsorption isotherm. The results show that theadsorption reaches the equilibrium with the increase of adsorption time,and then desorption occurres. Theadsorption effect of these three species of algae on Pb2+is better under slightly acidic conditions. The increase ofadsorbent amount reduces the adsorption capacity of the unit mass adsorbent when the adsorption reaches theequilibrium. It is also found that the concentration of Na+greatly influences the adsorption of Pb2+. And theadsorption isotherms indicate that adsorption behaviors of these three algae are consistent with the Langmuirmodel,where the maximum adsorption capacity of three kinds of algae for Pb2+is 27.50 mg/g,21.00 mg/g and 25.85 mg/g respectively. These algae have high adsorption capacity for Pb2+,and are cheap and available,so they are expected to be applied in treating heavy metal pollution.
作者
祝亚平
周旋
朱密
何军良
宋翰林
ZHU Yaping;ZHOU Xuan;ZHU Mi;HE Junliang;SONG Hanlin(School of Chemical &Environmental Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《武汉工程大学学报》
CAS
2018年第6期614-618,共5页
Journal of Wuhan Institute of Technology
基金
武汉工程大学第九届研究生创新基金(CX2017107)
武汉工程大学第十期大学生校长基金(2015061)
关键词
淡水藻
吸附
铅离子
fresh algae
adsorption
lead ion
