Adsorption

Equilibrium isotherms Langmuir isotherm proposed by Langmuir, (1918) with some limitations Dąbrowski, (2001) expressed as: (4) Where qm (mg g–1) is the maximum amount of the metal ion per unit weight of adsorbent, ‘qe’ is equilibrium adsorption capacity (mg g–1), ‘Ce’ is the equilibrium concentration of the adsorbate (mg L–1), and b is a constant which reveals the affinity of binding sites (L mg-1). From the plots between (Ce/qe ) and Ce the slope (1/qm ) and the intercept (1/…

of inert MoS2 basal plane. Here, we demonstrate from first-principles calculations that the gas adsorption properties of monolayer-MoS2 can be modulated through MoS antisite doping and strain. The antisite doped MoS defect with highly localized d-orbital electron density significantly promotes the electronic and catalytic properties through orbital hybridization, which leads to highly enhanced adsorption of NO, NO2, NH3, CO and CO2 gas molecules, in comparison to pristine MoS2. On application…

CORROSION STUDIES WITH ANTIGONON LEPTOPUS IN 1M HCl S.Aejitha 1, P P.K.Kasthuri 2andGeethamani 3 1 Department of Chemistry, Asian College of Engineering & Technology, Coimbatore- 641110, India 2 Department of Chemistry, L.R.G.Government Arts College for Women, Tirupur- 638604, India 3 Department of Chemistry, Sriguru Engineering College of Technology, Tamil Nadu, Coimbatore -641110, India Correspondence should be addressed to S.Aejitha ,aejitha_subbaian@yahoo.co.in ABSTRACT The inhibition…

Characterizing the adsorption of Pb is an important aspect of understanding the mobility of the compound in soils. The ability of soils to retain heavy metals by adsorption may determine the availability of biological uptake and if the contamination will affect resources such as surface or groundwater. Variable soil types have differing capacities to adsorb metals, and the two primary factors that influence this mechanism are pH and presence of organic material (Baird,…

CHAPTER I INTRODUCTION 1.1 BACKGROUND STUDY Wastewater in the textile , plastic, paper and cosmetics industry is a major threat to the environment. The volume of wastewater produced starts from different processes throughout from the pretreatments to the final treatment. The contents found in the wastewater are complex, having inorganic and organic compound chemicals in it and aquatic lives are at risk. Some of these wastes have even caused mutation in genetic coding of the marine…

Problem Statement Industries are generated waste water, which contain dyes and pigments in waste water. Characteristically high in colour and organic content (Grag, et al., 2004). Dyes are widely used in industries such as textile, rubber, paper, plastic, and cosmetic. There are many of dyes exist in industries and one of them is methyl red and through nano zerovalent iron removal of dyes from waste water. Dye industry effluents constitute one of the most problematic wastewaters to be treated…

CHAPTER 1 INTRODUCTION 1.1 BACKGROUND The catalytic converter was invented by Eugene Houdry, a French mechanical engineer and skilled in catalytic oil refining who lived in the United States around 1950. The invention of catalytic converter has a major role in controlling harmful emissions. When the paper of smog in Los Angeles was published, Houdry became anxious about the role of smoke stack and automobile exhaust in air pollution and established a company, Oxy-Catalyst. Houdry primary…

The investigation took into consideration the implication of contact time, initial concentration, pH and temperature on the adsorption process. The absorbent (TFS-CE) was prepared using graft copolymerization of hydroxyethylmethacrylate on shells of the tamarind fruit with the aid of N-N’-methylenebisacrylamide for crosslinking. Using batch method, concentrated solutions containing…

1. INTRODUCTION Electrochemical Impedance Spectroscopy is an effective method of analyzing the intricate electrical resistance of a process and it is sensitive to surface phenomena and changes in the bulk properties. Thus it plays a major role in electrochemical research. It has been diligently used for the interpretation of corrosion mechanisms and in the characterisation of charge transport over the membrane. In the area of biosensors, it is especially appropriate for the detection of…

electron microscope (SEM, Quanta 250 FEG, FEI Company, USA) at an accelerating voltage of 30 kV was used for evaluation of surface morphology and particle size determination. The specific surface area of the HAPNRs was measured by the BET-method (adsorption gas N2, carrier…