Adsorption Characteristics of Magnesium-Modified Bentonite Clay with Respect to Acid Blue 129 in Aqueous Media

被引：16

作者：

Hussain, Sajjad ^{[1
]}

Ullah, Zia ^{[2
]}

Gul, Saima ^{[3
]}

Khattak, Rozina ^{[3
]}

Kazmi, Nida ^{[2
]}

Rehman, Fozia ^{[4
]}

Khan, Sabir ^{[5
]}

Ahmad, Khalid ^{[5
]}

Imad, Mohammad ^{[1
]}

Khan, Adnan ^{[2
]}

机构：

[1] GIK Inst Engn Sci & Technol Topi, Fac Mat & Chem Engn, Kpk 23460, Pakistan

[2] Univ Peshawar, Inst Chem Sci, Kpk 25120, Pakistan

[3] Shaheed Benazir Bhutto Womens Univ, Dept Biochem, Peshawar 25120, Kpk, Pakistan

[4] COMSAT Inst, IRCBM, Lahore, Pakistan

[5] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP, Brazil

来源：

POLISH JOURNAL OF ENVIRONMENTAL STUDIES | 2016年 / 25卷 / 05期

关键词：

acid blue; clay; adsorption; isotherms; kinetics; bentonite; ACTIVATED CARBON; WASTE-WATER; DYE REMOVAL; BASIC-DYES; RED; TOXICITY;

D O I：

10.15244/pjoes/62272

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Locally available bentonite clay has been modified by magnesium and used to eliminate acid blue 129 from aqueous solutions. The adsorption was studied under different experimental conditions such as dye concentrations, temperature, and shaking time. The adsorption of the dye increased with time and followed the pseudo-first-order kinetic with rate constant "k" 0.126 min(-1) at 283 K. Thermodynamic parameters such as Delta H degrees, Delta S degrees, and Delta G degrees were calculated from the slope and intercept of the linear plots of In K against 1/T. Analysis of adsorption results obtained at temperatures of 283, 293, 303, and 313 K showed that the adsorption pattern on bentonite seems to follow Langmuir and Freundlih. The increase in temperature reduces adsorption capacity by magnesium-modified bentonite due to the enhancement of the desorption step in the mechanism. The activation energy of the adsorption process was found to be 3.55 kJ mol(-1). The Mg-bentonite showed better adsorption than Ba and Al-bentonite. Our study reveals that abundantly available local clay may be used to eliminate dyes from aqueous solutions.

引用

页码：1947 / 1953

页数：7

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