Issue 86, 2016

Toward the design of Zn–Al and Zn–Cr LDH wrapped in activated carbon for the solar assisted de-coloration of organic dyes

Abstract

Designing of materials for the extraction of organic toxins are the critical factors for environmental remediation. In the present study, a layered double hydroxide (LDH) of the binary compounds Zn–Al and Zn–Cr wrapped in activated carbon were synthesized through the co-precipitation method. These catalysts were characterized by FESEM, XRD, EDS, XPS, FTIR, PL and DRS. These catalyst were evaluated for the adsorption-assisted photodegradation of acridine orange (AO), malachite green (MG), crystal violet (CV), congo red (CR) and methyl orange (MO) dyes. The adsorption-assisted photodegradation was studied in four different parameters: dark, visible, ultraviolet and sunlight exposure conditions. Under various light effects, AO was selectively removed and Zn–Al/C-LDH showed stronger activity then Zn–Cr/C-LDH. Both catalysts showed approximately 90% removal efficiency of AO in sunlight. PL and DRS data showed prominent bands for the respective catalysts in the visible region. Zn–Al/C-LDH and Zn–Cr/C-LDH showed band gaps of 2.97 eV and 2.91 eV, respectively. Zn–Al/C-LDH showed very good recyclability and durability until the fourth cycle and still remained active after the fourth cycle as compared to Zn–Cr/C-LDH, which also showed good recyclability until the fourth cycle, but remained inactive after the fourth cycle. It was also observed that the specific light intensity and the substrate-catalyst specificity required equal consideration during the development of these new catalysts.

Graphical abstract: Toward the design of Zn–Al and Zn–Cr LDH wrapped in activated carbon for the solar assisted de-coloration of organic dyes

Article information

Article type
Paper
Submitted
24 Apr 2016
Accepted
06 Aug 2016
First published
08 Aug 2016

RSC Adv., 2016,6, 83196-83208

Toward the design of Zn–Al and Zn–Cr LDH wrapped in activated carbon for the solar assisted de-coloration of organic dyes

S. A. Khan, S. B. Khan and A. M. Asiri, RSC Adv., 2016, 6, 83196 DOI: 10.1039/C6RA10598J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements