Research on the adsorption capacity of thermal-modified waste tea for Congo Red

doi:10.11894/1005-829x.2017.37(4).019

Abstract

Abstract:

Thermal-modified waste tea has been used for the adsorption of dyestuff Congo Red. The influences of various operation parameters such as pH,sorbent dosage,initial concentration and temperature on adsorption capacity of thermal modified waste tea for dyestuff are investigated. The basic physicochemical characteristics of modified waste tea are researched by means of scanning electron microscopy(SEM) and BET. The adsorption kinetics models of pseudo-first-order equation and pseudo-second-order equation fit to the adsorption kinetics process of thermal-modified waste tea for adsorbing dyestuff Congo Red. The results show that pores in different shapes occur on the surfaces of thermal-modified waste tea and the specific surface,total pore volume and average pore diameter have all increased a lot,compared with the results before the modification. The dyestuff adsorption rate reaches the best,reaching 98.4%,and adsorption capacity 123 mg/g,when the mass concentration of solution is 50 mg/L,pH=4,sorbent dosage 0.4 g/L,and temperature 35℃. The Congo Red adsorption kinetics by thermal-modified waste tea fits to the pseudo-second-order kinetics model. The adsorption process is decided by chemisorption and physisorptions. Thermodynamic analysis indicates that the adsorption process is a spontaneous endothermic one.

Key words: waste tea, Congo Red, adsorption

摘要：

采用热改性废茶叶吸附刚果红染料，考察了pH、吸附剂投加量、染料液浓度和温度对热改性废茶叶吸附染料性能的影响。采用SEM和BET研究了热改性茶叶的基本物理化学特性，最后采用伪一阶动力学模型和伪二阶动力学模型拟合了改性废茶叶对刚果红染料的吸附动力学过程，并对其吸附热力学进行分析。结果表明，热改性废茶叶表面出现了形状各异的小孔，其比表面积、总孔容和平均孔径比改性前增加较多；当溶液质量浓度为50 mg/L、pH为4、吸附剂投加量为0.4 g/L、温度为35℃时，染料的吸附率达到最佳，为98.4%，吸附量为123 mg/g；热改性废茶叶对刚果红吸附动力学符合伪二阶动力学模型，吸附过程是由物理吸附和化学吸附共同决定的。热力学分析表明，吸附过程是自发进行的吸热过程。

关键词: 废茶叶, 刚果红, 吸附

CLC Number:

X703

Wang Zeyi, Zhao bin, Shen Boxiong, Sagnik Chakraborty, Gao Lanjun. Research on the adsorption capacity of thermal-modified waste tea for Congo Red[J]. INDUSTRIAL WATER TREATMENT, 2017, 37(4): 78-82.

王泽怿, 赵斌, 沈伯雄, Sagnik Chakraborty, 高兰君. 热改性废茶叶吸附刚果红性能的研究[J]. 工业水处理, 2017, 37(4): 78-82.

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URL: https://www.iwt.cn/EN/10.11894/1005-829x.2017.37(4).019

https://www.iwt.cn/EN/Y2017/V37/I4/78

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