Ads: Get Admission into 200 Level and Study any Course in any University of Your Choice. Low Fees | No JAMB UTME. Call 09038456231

The Studies of Adsorption Isotherms and Kinetics of Chromium Removal from Tannery Effluents using Cross-linked Chitosan obtained from Snail Shell

Filed in Chemistry Project Topics, Current Projects by on September 28, 2020
ADS! Obtain Up to N300,000 Cash in the 2020 Aspire Contest

The Studies of Adsorption Isotherms and Kinetics of Chromium Removal from Tannery Effluents using Cross-linked Chitosan obtained from Snail Shell.

ABSTRACT  

Chitosan is a natural polymer that has been employed in dye adsorption. In this work, adsorption and thermodynamic data for the interaction of Chromium in tannery effluent with chitosan in aqueous solutions were investigated. The equilibrium adsorption isotherms were determined, from 298 to 345 K. Adsorption data were adjusted to Langmuir, Freundlich, as well as Pseudo second order Kinetic model and van’t Hoff model of analysis of adsorption parameters.

The analysis showed that the Langmuir isotherm model was the most appropriate for fitting the experimental data, with a maximum monolayer adsorption of 33.3mg/kg at 298 K this value decreased with increase in temperature. The enthalpy of adsorption; ΔH, and the entropy; ΔS were – 13.54 kJ mol-1 and -0.1005kJ mol-1 K -1 respectively. The values demonstrated that the adsorption process was exothermic, favorable, and that randomness of the system decreased during the adsorption process.

The Freundlich adsorption model, gave favorable constants; Kf and n consistent with good adsorption process. The pseudo-second reaction model gave straight line plot with rate constant of 1.1673x 10-3 kg mg-1 min-1 and the qe was 29.85 mg/kg, this showed that the adsorption of Chromium ion by the chitosan followed the pseudo-second order kinetic model. 

INTRODUCTION  

Many Industries such as textile, paper, plastics and dyestuffs, consume substantial volume of water and also use chemicals during manufacturing and dyeing to color their products. As a result, they generate considerable amount of polluted water depending on the type of process. Their toxic effluents are major source of aquatic pollution and cause considerable damage to the receiving water if discharged untreated.

During the past three decades, several waste water treatment methods have been reported and attempted for the removal of pollutants from tannery, textile, pulp and paper mill effluents. It is now recognized that adsorption using low-cost adsorbent is an economic method for water decontamination. A large variety of non-conventional adsorbent materials have been proposed and studied for their ability to remove toxic metals from waste water.

However, low-cost adsorbents with high adsorption capacity are still under development to reduce the adsorbent dose and minimize disposal problems. Much attention has recently been focused on various biosorbent materials such as fungal or bacterial biomass and biopolymers that can be obtained in large quantities and that are harmless to nature. Special attention is given to polysaccharides such as chitosan, a natural amino-polymer.

It is clear from the literature that biosorption of toxins using chitosan is one of the more frequently reported emerging methods for the removal of pollutants. In the past century, a rapid expansion in the chemical industries leads to increase in complexity of toxic effluents. Several industrial processes generate metal containing wastes. Heavy metal contamination has been a critical problem mainly because metals tend to persist and accumulate in the environment (Forstner, 1983). 

REFERENCES

Alok, M; Jyoti, M; Lisha, K, 2007. Utillization of Hen Feathers for the Adsorption of Indigo Carmine from
Simulated Effluent. Journal of Eviromental Protection Science, Volume 1, pp. 92-100.

Armienta-Hernandez, M. & Rodriguez-Castillo, R., 1995. Environmental exposure to chromium
compound in the valley of Leon, Mexico. Environmental Health Perspective, Volume 103, pp. 1-8.

Baral, S., Das, S. & Rath, P., 2006. Hexavalent chromium removal from aqueous solution by adsorption
on treated sawdust. Biochemical Engineering Journal, 31(3), pp. 216-222.

Boddu, V., Abburi, K., Talbott, J. & Smith, E., 2003. Removal of hexavalent chromium from wastewater
using a new composite chitosan biosorbent. Environmental Science and Technology, Volume 37, pp.
4449-4556.

Booker, S. & Pellerin, C., 2000. Reflections on hexavalent chromium. Environmental Health Pespectives,
Volume 108, pp. 402-407.

Chassary, P., Vincent, T. & Guibal, E., 2004. Metal anion sorption on chitosan and derivative materials; a
strategy for polymer modification and optimum use. Reactive and Functional Polymers, 60(74), pp. 137-149.

Chiou, M., Ho, P. & Li, H., 2001. Dyes and Pigments, Volume 60, p. 69.

Dambies, L., Vincent, T. & Guibal, E., 2002. Treatment of arsenic- containing solutions using chitosan
derivatives: uptake mechanism and sorption performances. Water Research, Volume 36, pp. 3699-3710.

Dantas, T. et al., 2001. Chromium adsorption by chitosan impregnated with microemulsion. Langmuir,
Volume 17, pp. 4256-4260.

Desbrieres, J., 2002. Viscosity of semi flexible chitosan solutions: influence of concentration,
temperature and role of intermolecular interractions. Biomacromolecules, Volume 3, pp. 342-349.

Desta, M. B., 2013. Langmuir and Freundlich Isotherm studies for the adsorption of textile metal ions on
teff straw (eragrosti tef) agricultural waste. Journal of thermodynamics, Volume 2013 (2013).

CSN Team.

Enter your email address:

Delivered by TMLT NIGERIA

Join Over 3,500 000+ Readers Online Now!


=> FOLLOW US ON INSTAGRAM | FACEBOOK & TWITTER FOR LATEST UPDATES

ADS: KNOCK-OFF DIABETES IN JUST 60 DAYS! - ORDER YOURS HERE

COPYRIGHT WARNING! Contents on this website may not be republished, reproduced, redistributed either in whole or in part without due permission or acknowledgement. All contents are protected by DMCA.
The content on this site is posted with good intentions. If you own this content & believe your copyright was violated or infringed, make sure you contact us at [[email protected]] to file a complaint and actions will be taken immediately.

Tags: , ,

Comments are closed.