Issue 33, 2021

Enhancing the removal efficiency of methylene blue in water by fly ash via a modified adsorbent with alkaline thermal hydrolysis treatment

Abstract

An effective adsorbent of methylene blue was synthesized from coal fly ash (FA; waste material from a coal power plant) by a denaturing process with an alkaline solution at 90 °C. The denatured fly ash (D-FA) has a surface area and pore volume of 66.39 m2 g−1 and 15.33 cm3 g−1, respectively, whereas the values of the original FA are negligible, i.e., 3.55 m2 g−1 and 0.02 cm3 g−1. The removal of methylene blue (MB) in aqueous solution by D-FA was increased in the range of initial MB concentration (10–20 mg L−1); contact time (0–120 min); pH (2–8); D-FA dosage (1–4 g L−1). However, a larger value of those operational parameters would not improve the removal activity. Furthermore, the methylene blue adsorption on the denatured FA was fitted with the Langmuir model with R2 = 0.9991; the maximum adsorption capacity was determined as 28.65 mg g−1 from the model. Overall, the highest removal efficiency of MB using D-FA with the dosage of 4 g L−1 was 97.1% in 30 mg L−1 solution of methylene blue at pH = 7. The alkaline hydrothermal denaturation of waste FA is a promising approach to produce an adsorbent with beneficial environmental engineering applications.

Graphical abstract: Enhancing the removal efficiency of methylene blue in water by fly ash via a modified adsorbent with alkaline thermal hydrolysis treatment

Article information

Article type
Paper
Submitted
05 Apr 2021
Accepted
01 Jun 2021
First published
07 Jun 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 20292-20302

Enhancing the removal efficiency of methylene blue in water by fly ash via a modified adsorbent with alkaline thermal hydrolysis treatment

N. T. Dinh, L. N. H. Vo, N. T. T. Tran, T. D. Phan and D. B. Nguyen, RSC Adv., 2021, 11, 20292 DOI: 10.1039/D1RA02637B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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