摘要
研究了油茶果壳(COS)对结晶紫的吸附特性,考察了COS用量、p H值对COS吸附性能的影响。结果表明,在COS用量为0.30 g、结晶紫初始浓度为50 mg/L、p H=8.00溶液条件下,室温振荡3 h达到吸附平衡,平衡状态下油茶果壳对结晶紫的去除率达到98.01%。用拟一级动力学模型、拟二级动力学模型和内扩散模型分别对动力学数据进行拟合,结果发现,COS吸附结晶紫的动力学数据符合拟二级动力学模型,结晶紫初始浓度为40 mg/L时速率常数和相关性系数分别为0.0436 L/(mg·min)和0.9999。吸附等温线符合Langmuir吸附等温式,随温度在一定范围内升高,最大吸附量增大,且相关性系数均高于0.99,当T=293 K时COS对结晶紫的最大吸附量为26.932 mg/g。热力学计算结果表明,该吸附过程是一个伴有物理吸附的吸热反应,可自发进行。此外,再生实验结果发现,油茶果壳再生7次后,对结晶紫的去除率仍为95%以上。
In this study,the adsorptive property of crystal violet( CV) on camellia oleifera shell( COS)was investigated,the effects of different factors on adsorptive property such as COS dose,p H were studied. The results showed that the optimal conditions were 0. 30 g of camellia oleifera shell,p H = 8. 00,initial CV concentration of 50 mg / L,adsorption time of 3 h and room temperature. The removal rate of CV on camellia oleifera shell was 98. 01% under the equilibrium state. The pseudo first order model,pseudo second order model and intraparticle diffusion model were used to describe the kinetic behavior,the results showed that the pseudo second order model agreed with the experimental data well. When the initial CV concentration was 40 mg / L,the rate constant and the correlation coefficient were 0. 0436 L /( mg·min) and 0. 9999,respectively. The adsorption isotherm for CV fitted the Langmuir isotherm model well,the adsorption capacity of CV on COS increased with the increasing temperature in a certain range,and the correlation coefficients were all above 0. 99. When the temperature was 293 K,the maximum adsorption amount of CV was 26. 932 mg / g. The thermodynamic calculation results indicated that the adsorption process was an endothermic reaction accompanied by physical adsorption,and can be spontaneous. In addition,the regeneration experiment results found that the removal rate of crystal violet was more than 95% after the camellia shell was regenerated seven times.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第12期5129-5134,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(21165013
21366024)
江西省青年科学基金项目(20114BAB213016)
江西省重大招标项目(赣科发计字[2010]217号)
关键词
油茶果壳
结晶紫
吸附
camellia oleifera shell
crystal violet
adsorption
