Volume 11, Issue 3 (Pajouhan Scientific Journal, Spring 2013)                   Pajouhan Sci J 2013, 11(3): 52-59 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Asgari G, Seid Mohammadi A, shabanlo A, MehrAliPour J. Removal of cyanide by eggshell as low-cost adsorbent. Pajouhan Sci J 2013; 11 (3) :52-59
URL: http://psj.umsha.ac.ir/article-1-66-en.html
1- , jamalmehralipour@yahoo.com
Abstract:   (6231 Views)
Background and Objectives: cyanides as carbon-nitrogen radicals are very toxic compounds and highly harmful to humans and aquatic organisms. The efficacy of eggshells (ES) was investigated in this research work as an adsorbent for the elimination of cyanide from polluted streams.
Methods: In this experimental study, the capability of ES to adsorb cyanide ions was conducted using a series of batch tests in a shaker-incubator instrument. For each batch run, 100 mL of solution containing a known initial concentration of cyanide and with the preferred level of pH was shacked. The effects of selected parameters such as pH (11-3), reaction time (60–5 min) cyanide concentrations (150–50 mg/L) and the adsorbent dosage (2–0.25 g/L) were investigated on the removal cyanide as a target contaminate. Chemical composition ES were analyzed using a Philips model XL- 30 scanning electron microscope (SEM) with energy-dispersive X-ray microanalysis (EDX). The specific surface and pore size distributions of ES were measured via Brunauer-Emmett-Teller (BET) isotherm and Barrett-Joyner-Halenda (BJH) methods using a Micrometrics particle size analyzer. The concentration of cyanide in solution before and after treatment was determined using the titrimetric method as described in the standard methods.
Results: Analysis of the ES component using the EDX technique showed that the main part of it consisted of calcium and its other components were magnesium, iron, aluminum and silicate. The experimental data showed that the maximum cyanide removal occurred at pH of 11, adsorbent dose (0.5 g/L) and 40 min contact time. The kinetic evaluation indicated that the pseudo-second-order kinetic had the best fit to the experimental results predicting a chemisorptions process. The equilibrium adsorption of cyanide onto ES was well represented by the Langmuir equation.
Conclusions: As a result, ES as waste materials was revealed as a very efficient and low-cost adsorbent and a promising option for removing cyanide from industrial wastewaters.
Full-Text [PDF 471 kb]   (2362 Downloads)    
Type of Study: Research Article |
Received: 2014/09/13 | Accepted: 2014/09/13 | Published: 2014/09/13

Add your comments about this article : Your username or Email:
CAPTCHA

Send email to the article author


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

© 2024 CC BY-NC 4.0 | Pajouhan Scientific Journal

Designed & Developed by : Yektaweb