Cobalt particles encapsulated and nitrogen-doped bamboo-like carbon nanotubes as a catalytic and adsorptive bifunctional material for efficient removal of organic pollutants from wastewater. Issue 6 (December 2017)

• Record Type: Journal Article
• Authors: Chen, Mantang; Zhu, Lihua; Zhang, Yuan; Zou, Jing; Tang, Heqing
• Is Part Of: Journal of environmental chemical engineering. Volume 5:Issue 6(2017)
• Page Start: 5322
• Page End: 5330
• Publication Date: 2017-12
• Subjects: Bifunctional material -- Catalysis -- Adsorption -- Cobalt -- Advanced oxidation -- Dye; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2017.10.011
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Co/N-CNTs was prepared by a calcination-acid treatment method with Co3 [Co(CN)6 ]2 as a precursor. Co/N-CNTs had excellent adsorption and catalytic performances for PMS activation. Co/N-CNTs worked in a wide range of operation conditions with a good recyclability. There was a synergistic effect between adsorption and catalysis on Co/N-CNTs. The mechanism involved the efficient cycle between Co(II) and Co(Ш). Abstract: Bifunctional materials having both good catalytic and adsorptive performances are promising in the field of wastewater treatment. Cobalt-encapsulated and nitrogen-doped bamboo-like carbon nanotubes (Co/N-CNTs) were prepared by a simple method of calcination and acid treatment with Co3 [Co(CN)6 ]2 as a precursor. Based on a series of characterization and performance studies, Co/N-CNTs were confirmed to be able to function as both a catalyst and an adsorbent for oxidative degradation of organic pollutants in the presence of peroxymonosulfate (PMS). When rhodamine B was used as a typical dye pollutant, it was found that all the added pollutant (10 mg L −1 ) was completely removed in 7 min by using 0.1 g L −1 Co/N-CNTs and 0.2 g L −1 PMS. The fast and efficient degradation of the pollutant was attributed to the synergistic effect between adsorption and catalysis on the surface of Co/N-CNTs. It was confirmed that this bifunctional material provided good performances in a wide range of operation conditions, such as a wide temperature range and a wide pH range. Co/N-CNTs also exhibited a good recyclability. A mechanism study indicated that the main active species in the catalytic oxidation process was surface-bound SO4 − and OH.