Equilibrium and Thermodynamic Studies on the Adsorption of the Dye Tartrazine onto Waste "Coconut Husks" Carbon and Activated Carbon

被引:63
|
作者
Gupta, Vinod K. [1 ,2 ]
Jain, Rajeev [3 ]
Shrivastava, Meenakshi [3 ]
Nayak, Arunima [1 ]
机构
[1] Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India
[2] King Fahd Univ Petr & Minerals, Dept Chem, Dhahran 31261, Saudi Arabia
[3] Jiwaji Univ, Dept Environm Chem, Gwalior 474011, India
来源
关键词
AQUEOUS-SOLUTIONS; INDUSTRIAL-WASTES; TEXTILE EFFLUENT; BOTTOM ASH; REMOVAL; ADSORBENTS; AZO; DECOLORIZATION; BIOSORPTION; KINETICS;
D O I
10.1021/je100649h
中图分类号
O414.1 [热力学];
学科分类号
摘要
Removal of tartrazine by an agricultural waste, coconut husks (CH), was investigated and compared with activated carbon (AC). The effect of pH, temperature, amount of adsorbent, contact time, initial dye concentration, and particle size on the extent of adsorption by the two adsorbents was investigated. The maximum adsorption capacity was obtained for pH 2.5, adsorbent dose of 3.3 g . L-1, particle size > 0.15 mm, contact time of 210 min, temperature of 30 degrees C, and dye concentration of 6.10(-5) M for the CH tartrazine system and pH 2.5, adsorbent dose of 0.3 g.L-1, particle size > 0.15 mm, contact time of 40 min, temperature of 50 degrees C, and dye concentration of 15.10(-5) M for the AC-tartrazine system. The negative values of Delta G degrees indicated that the dye adsorption process is spontaneous in nature. The positive value of Delta H degrees shows the endothermic nature of the AC-tartrazine system, whereas the negative value of Delta H degrees indicates the exothermic nature of the CH-tartrazine system. The adsorption was found to undergo pseudo first-order adsorption kinetics. A significant amount of the dye (99 % for AC and 92 % for CH) was recovered by using 1.0 M NaOH as an eluting agent. The results revealed that CH can be used as a economically viable alternative to AC.
引用
收藏
页码:5083 / 5090
页数:8
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