摘要
对甘蔗渣预处理后以Na OH和二硫化碳改性转型合成重金属吸附剂。实验结果表明,改性后蔗髓纤维（MSCB）投加量为4 g/L,对50 mg/L Cr（Ⅵ）的最大吸附量为9.8 mg/g,平衡时间为30~60 min,去除率达98.05%,出水浓度0.78 mg/L,比改性前蔗髓纤维对Cr（Ⅵ）的吸附率（23.7%）提高了74.35%。MSCB对Cr（Ⅵ）的吸附进行Langmuir与Freundlich等温吸附方程拟合,更符合Langmuir单分子化学吸附;对吸附动力学拟合模型分析,吸附过程更符合准二级速率方程;吸附热力学模型显示该吸附为自发进行的吸热反应且是熵增过程。
A novel cheap efficient adsorbent of heavy metals was modified with NaOH and carbon disulfide based on sugarcane bagasse （SCB）. The adsorption property of modified sugarcane bagasse （MSCB） for Cr（Ⅵ） from aqueous solution was studied. The results showed that the maximum adsorption capacity of MSCB for Cr（Ⅵ） was 9.8 mg/g, the adsorption equilibrium time was about from 30 to 60 min, removal rate was 98.05%, the concentration was 0.78 mg/L, and increased about 74.35% compared to that of SCB （23.7%）. The adsorption of Cr（Ⅵ） on the MSCB was found to follow the pseudo-second-order kinetics equation and agree well with both Langmuir and Freundlich adsorption isotherm model. Adsorption thermodynamics model showed that the adsorption process for spontaneous endothermic reaction and entropy increases.
出处
《广州化学》
CAS
2015年第4期1-6,33,共7页
Guangzhou Chemistry
基金
江门市科技局科技计划项目(江财工[2011]131号)
五邑大学青年科研基金资助项目(2013zk21)
国家级大学生创新项目(教发2014-207号文)
关键词
改性
重金属吸附剂
Cr(Ⅵ)离子
单分子层吸附
吸附热力学
modification
adsorbent of heavy metals
Cr（Ⅵ） ions
monolayer adsorption
adsorptionthermodynamics
