Removal of heavy metals from water sources in the developing world using low-cost materials: A review.

https://opus.lib.uts.edu.au/bitstream/10453/37111/4/Review%20Typical%20Lignocellulosic%20Wastes%20%28BITE%2012760%29.pdf

Typical lignocellulosic wastes and by-products for biosorption process in water and wastewater treatment: a critical review.

Industries generating wastewater with elevated concentrations of pollutants (e.g. metals, dyes, phenolic compounds, anions, etc.) need specialized atreatment systems. Adsorption is one of the most extensively applied techniques for the removal of pollutants from the industrial effluents. The prominent and emerging trend of subjecting biosorbent in the adsorption technology is mainly because of their natural existence, abundance, renewable, biodegradable and economic features. The adsorption isotherm equations used to describe the experimental data and the thermodynamic assumptions of the models often provide some insight into the sorption mechanism, the surface properties and affinity of the biosorbent. This paper presents a state of the art on the review of adsorption isotherm models in an exhaustive manner on the basis of two, three, four and five parameters respectively. Focuses on the various sources of agricultural byproducts as biosorbents and describes on the potential applications of different adsorption isotherm models for the evaluation of the wastewater pollutants biosorption. It is evident from the literature survey that various adsorption isotherm models have been considered under study by the researchers but mostly two and three parameter isotherm model were best fitted the equilibrium data. This paper reviews the adsorption isotherm models on the basis of parameters that can be applied for exploring a novel biosorbents.

Relevance of isotherm models in biosorption of pollutants by agricultural byproducts

Studies on the removal of tetracycline by multi-walled carbon nanotubes

Industrial wastewater polluted with various contaminants, including heavy metals, dyes, etc., endangers human health and the environment. Various separation techniques have been developed for the removal of pollutants from aqueous solutions. Adsorption process has drawn considerable attention due to its simplicity of design, high removal efficiency, even at dilute concentration, and economical aspect. We reviewed the most common two, three, four, and five parameter adsorption isotherm models corresponding to monolayer and multilayer adsorption on the basis of parameters that can be used for exploring novel adsorbents. Thermodynamic assumptions of the models give information about the surface properties, capacity of the adsorbent and adsorption mechanism. Seven error functions were investigated to evaluate the fitness quality of isotherm models with the experimental equilibrium data.

/pdf/monolayer-and-multilayer-adsorption-isotherm-models-for-19r6dsml0t.pdf

Monolayer and multilayer adsorption isotherm models for sorption from aqueous media

Biosorption of Cr(VI) ions from aqueous solutions: Kinetics, equilibrium, thermodynamics and desorption studies

Adsorptive removal of Cu(II) from aqueous solution and industrial effluent using natural/agricultural wastes

Purpose
The purpose of the research is to investigate the applicability of the low-cost natural biosorbents for the removal of Pb(II) ions from aqueous solution and effluent from battery industry.

Removal of Pb(II) ions from aqueous solution and industrial effluent using natural biosorbents

Removal of Pb(II) ions from aqueous solution using water hyacinth root by fixed-bed column and ANN modeling.

The ability of eight natural adsorbents were investigated for adsorptive removal of Cr(VI) from aqueous solutions. Various physico-chemical parameters such as pH, initial metal ion concentration, adsorbent dose level and equi-librium contact time were optimized in batch adsorption technique. A detailed Fourier Transform Infrared Spectrophotometer (FTIR) study of adsorbents and Cr(VI) loaded adsorbents at the optimized condition was carried out to identify the different functional groups that were responsible for the adsorption. The important functional groups like hydroxyl, alkene, aromatic nitro, carboxilate anion, silicon oxide, sulphonic acid etc. were present in the natural adsorbent and were responsible for the chemical adsorption of Cr(VI) from aqueous solutions. The sorption energy calculated from Dubinin-Radushkevich isotherm indicated that the adsorption process were chemical in nature.

/pdf/cr-vi-ions-removal-from-aqueous-solutions-using-natural-15ozseily5.pdf

Biswajit Singha

Papers

Biosorption of Cr(VI) ions from aqueous solutions: Kinetics, equilibrium, thermodynamics and desorption studies

Adsorptive removal of Cu(II) from aqueous solution and industrial effluent using natural/agricultural wastes

Removal of Pb(II) ions from aqueous solution and industrial effluent using natural biosorbents

Removal of Pb(II) ions from aqueous solution using water hyacinth root by fixed-bed column and ANN modeling.

Cr(VI) Ions Removal from Aqueous Solutions Using Natural Adsorbents – FTIR Studies