| Home  | About ScienceAsia  | Publication charge  | Advertise with us  | Subscription for printed version  | Contact us  
Editorial Board
Journal Policy
Instructions for Authors
Online submission
Author Login
Reviewer Login
Volume 46 Number 3
Volume 46 Number 2
Volume 46 Number 1
Volume 46S Number 1
Volume 45 Number 6
Volume 45 Number 5
Earlier issues
Volume 46 Number 1 Volume 46 Number 2 Volume 46 Number 3

previous article next article 1

Research articles

ScienceAsia 46 (2020): 186-194 |doi: 10.2306/scienceasia1513-1874.2020.034

A potential biosorbent from Moringa oleifera pod husk for crystal violet adsorption: Kinetics, isotherms, thermodynamic and desorption studies

Adisak Keereerak, Watchanida Chinpa*

ABSTRACT:     Moringa oleifera pod husk (MOPH), an agricultural waste, is presented as a biosorbent for the adsorption of crystal violet (CV) in water. MOPH was characterized using Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and Brunauer-Emmett-Teller (BET) analysis. The effects of adsorption parameters on adsorption capacity were optimized. Adsorption of CV by MOPH was rapid in the first 10 min, and equilibrium was approached within 60 min at all initial CV concentrations. The adsorption kinetics study revealed a good correlation between the pseudo-second order model and the experimental results. The maximum monolayer capacity obtained by Langmuir model was 156.25 mg/g at 25 °C. The negative values of thermodynamic parameters indicated a spontaneous and exothermic sorption process. The desorption of CV from MOPH was highest in aqueous acetic acid solution, and the re-adsorption study confirmed the reusability of the MOPH biosorbent. Taking into account its abundance, low cost, non-toxicity and its effectiveness and reusability based on the present results, MOPH can be regarded as a promising biosorbent for the CV removal.

Download PDF

9 Downloads 106 Views

a Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110 Thailand

* Corresponding author, E-mail: watchanida.c@psu.ac.th

Received 30 Oct 2019, Accepted 25 Apr 2020