Improved arsenite adsorption using iron-impregnated marble dust with surface functionalized by quaternary ammonium ions
- PDF / 3,684,141 Bytes
- 20 Pages / 595.276 x 790.866 pts Page_size
- 96 Downloads / 203 Views
ORIGINAL PAPER
Improved arsenite adsorption using iron‑impregnated marble dust with surface functionalized by quaternary ammonium ions A. D. Gupta1 · H. Singh1 · V. K. Jaiswal2 · M. Goswami1 · V. Bhadauria3 Received: 9 May 2020 / Revised: 30 September 2020 / Accepted: 31 October 2020 © Islamic Azad University (IAU) 2020
Abstract The present study investigates the application of marble dust impregnated with iron and functionalized with quaternary ammonium ions [using ammonium persulphate (APS)] as a novel adsorbent for the removal of arsenite ions from wastewater. The optimal modification parameters were found to be 0.1 M FeCl3, 0.125% NaOH (w/v) and 0.0125 M of APS at a temperature of 80 °C. The maximum uptake capacity of As(III) ions was found to be 50 mg/g with 3.5 g/L of adsorbent for 90 min at pH = 7.0. Maximum negative ∆G° value (− 7.7 kJ/mol) was obtained at 298 K, indicating that low temperature favoured adsorption. Freundlich and Temkin isotherm models gave the best correlation coefficient (R2 > 0.95). The kinetic data were suitably described by pseudo-second-order kinetics. Film diffusion was inferred to be the rate-controlling mechanism based on Boyd plots. The synthesized adsorbent can be regenerated by flushing with an alkaline solution. Graphic Abstract
Arijit Dutta Gupta and Harinder Singh have contributed equally to this work. Editorial responsibility: Binbin Huang. Extended author information available on the last page of the article
13
Vol.:(0123456789)
International Journal of Environmental Science and Technology
Keywords Marble dust · Iron impregnation · Functionalization · Quaternization · Ammonium ions · Arsenic adsorption
Introduction Pollution and heavy metal pollution are one of the most troubling issues nowadays. Acceleration of the industrial activities worldwide has resulted in an increase in the proportion of heavy metals. Proper disposal, treatment and reusing of various industrial wastes is one of the key towards sustainable development (Mohan and Pittman 2007). The tremendous use of heavy metals and metalloids has resulted in pollution of water bodies in many parts of the globe (Mandal et al. 2013). Arsenic being a metalloid exists in the form of anions or oxides and is considered to be the 20th most abundant element found on the earth (Mohan and Pittman 2007). Natural phenomena such as weathering, volcanic eruptions, biological activities, geochemical actions, mining of gold, leaching of synthetic arsenic chemicals and compounds, desiccants, metal smelters, agricultural pesticides and other anthropogenic activities have resulted in an increase in the arsenic concentration in water bodies around the globe (Mandal et al. 2013; Mohan and Pittman 2007). Arsenic generally exists in the form of arsenites (As(III)) and arsenates (As(V)) depending upon redox potential and pH (Kim and Benjamin 2004; Lorenzen et al. 1995). At neutral pH, As (III) exists as neutral species, while As (V) exists as anionic species (Guan et al. 2012). Prolonged exposure to arsenic results in hazardou
Data Loading...
