Shape-tunable CuO-Nd(OH)3 nanocomposites with excellent adsorption capacity in organic dye removal and regeneration of spent adsorbent to reduce secondary waste

Gautam Kumar Sarma; Aslam Khan; Ahmed Mohamed El-Toni; Md Harunar Rashid

doi:10.1016/j.jhazmat.2019.120838

Shape-tunable CuO-Nd(OH)₃ nanocomposites with excellent adsorption capacity in organic dye removal and regeneration of spent adsorbent to reduce secondary waste

J Hazard Mater. 2019 Dec 15:380:120838. doi: 10.1016/j.jhazmat.2019.120838. Epub 2019 Jul 5.

Authors

Gautam Kumar Sarma¹, Aslam Khan², Ahmed Mohamed El-Toni², Md Harunar Rashid³

Affiliations

¹ Department of Chemistry, Rajiv Gandhi University, Rono Hills, Doimukh 791 112, Arunachal Pradesh, India.
² King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia.
³ Department of Chemistry, Rajiv Gandhi University, Rono Hills, Doimukh 791 112, Arunachal Pradesh, India. Electronic address: harunar.rashid@rgu.ac.in.

PMID: 31326832
DOI: 10.1016/j.jhazmat.2019.120838

Abstract

Herein, we report for the first time, the synthesis of CuO-Nd(OH)₃ nanocomposites via a co-precipitation method coupled with the hydrothermal aging process. Varying the pH of the reaction medium, the shape of the nanocomposites could be controlled which determines their surface areas. These CuO-Nd(OH)₃ nanocomposites exhibit very high adsorption capacity with successful removal of ∼ 97% of brilliant blue G (BBG) from water in 180 min under ambient condition. The adsorption process primarily follows Lagergren pseudo-first-order kinetics. The Langmuir isotherm model fits well with a very high monolayer adsorption capacity of 394.1 mg g^-1 at 30 °C. The mechanistic study supports chemisorption-type adsorption between the dye molecule and the adsorbent. Regeneration of the spent adsorbent makes the whole process cyclic and eco-friendly.

Keywords: Adsorption; Isotherm; Kinetics; Nanocomposites; Waste-water.

Publication types

Research Support, Non-U.S. Gov't