Sequestration of toxic congo red dye from aqueous solution using ecofriendly guar gum/ activated carbon nanocomposite

Vinod Kumar Gupta; Shilpi Agarwal; Rais Ahmad; Anam Mirza; Jyoti Mittal

doi:10.1016/j.ijbiomac.2020.05.025

Sequestration of toxic congo red dye from aqueous solution using ecofriendly guar gum/ activated carbon nanocomposite

Int J Biol Macromol. 2020 May 7:S0141-8130(20)33167-6. doi: 10.1016/j.ijbiomac.2020.05.025. Online ahead of print.

Authors

Vinod Kumar Gupta¹, Shilpi Agarwal², Rais Ahmad³, Anam Mirza⁴, Jyoti Mittal⁵

Affiliations

¹ Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia. Electronic address: vinodfcy@gmail.com.
² Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
³ Environmental Research Laboratory, Department of Applied Chemistry, Aligarh Muslim University, Aligarh 202002, India.
⁴ Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh, 202002, UP, India.
⁵ Department of Chemistry, Maulana Azad National Institute of Technology, Bhopal 462 003, India.

PMID: 32389650
DOI: 10.1016/j.ijbiomac.2020.05.025

Abstract

In the present study, a potential Guar gum/activated carbon nanocomposite as an adsorbent was synthesized and utilized for the sequestration of toxic congo red dye from synthetic wastewater. The nanocomposite was characterized using different techniques such as SEM, EDX, TEM, FTIR and XRD. Various physico-chemical parameters such as influence of contact time, pH, adsorbent dose, temperature and initial dye concentration were investigated to optimize conditions for maximum adsorption of congo red. Equilibrium data fitted well with Langmuir isotherm model having maximum adsorption capacity of 831.82 mgg^-1 at 313 K. The kinetic studies demonstrated that the adsorption followed a pseudo-second order kinetic model. The thermodynamic study showed that the adsorption of congo red onto nanocomposite was spontaneous, exothermic with decreased in randomness at solid/liquid interface. The regeneration study indicated that the nanocomposite could be reused successfully upto five consecutive cycles. Therefore, the present material can be effectively and efficiently urilized for the removal of congo red dye from aqueous solution as well as industrial wastewater.

Keywords: Congo red dye; Freundlich; Langmuir; Nanocomposite; Regeneration; Thermodynamic.