Adsorption of Acid Dyes onto Bentonite and Surfactant-modified Bentonite

Adsorption of Congo red (CR) from water via batch adsorption experiments onto bentonite and CTAB-modified bentonite (CTAB-MBn) was investigated.

Studies concerning the factors influencing the adsorption capacities of bentonite and CTAB-MBn, such as initial dye concentration, adsorbent dosage, pH, ionic strength, contact time and temperature were systematically investigated and discussed.

The results revealed that CTAB-modified bentonite demonstrated high adsorption capacities toward acid dyes, while bentonite exhibited sorption capacities lower than CTAB-MBn.

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Experimental Determination and Modeling of the Drying Curves of Eucalyptus camaldulensis

The aromatic and medicinal plants are more used for several applications in pharmacy, medicine and food processing therefore the necessity of their preservation. Eucalyptus camaldulensis is usually used for medicine for several aims such as anti-inflammatory of the respiratory tract.

In addition, Eucalyptus camaldulensis oil is an important, most popular and widely used essential oil. In order to preserve this seasonal plant, and make it available to consumers during the whole year, it undergoes specific technological treatments, such as drying.The leaves are perishable in nature because of high moisture content. For the effective utilization of the leaves, the postharvest processing aspect is important so that the quality of the leaves can be preserved with enhanced shelf life.

Dehydration is a useful method of preserving the leaves; it enhances the resistance of high humid products against degradation by decreasing their water activity. Conventional air drying is the most frequently used dehydration operation in food and chemical industry due to its controllable conditions and less dependency on climatic conditions. However, studies on the drying characteristics of Eucalyptus camaldulensis leaves are scarce in the literature.

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Preparation of Activated Carbon from Green Coconut Shell and its Characterization

Adsorption has appeared as one of the promising methods for CO2 capture and sequestration due to its low energy consumption, costeffectiveness, relatively simple technological process, non-corrosive to the equipments and it is applicable over a relatively wide range of temperatures and pressures. Development of new and highefficient solid adsorbents is crucial to enhance competitiveness of this process.

Zeolites or activated carbons are good adsorbents that are used for capturing CO2 from flue gas through physical adsorption, due to its porous structure. The extensive use of activated carbon is used now days, due to its large micro porosity, large specific surface area. The activated carbon is seems to be black in color and have large micro porosity. Activated carbon adsorption also used for treating low concentrations of wastewater streams at extremely low cost. The removal efficiency of Activated carbon is very high for harmful pollutants. As environmental pollution is the major problem now a day’s so need of activated carbon is growing day by day. Its texture characteristics and surface properties depend on the raw material and on the method used for its preparation.

For AC, the removal of moisture is not required and it is easy for regeneration and has a high CO2 adsorption capacity at ambient pressure and also its good adsorption properties. Activated carbons can be prepared by either a physical method or chemical method. It is produced from a large number of carbonaceous raw materials like coal, lignite, wood and some agricultural product like rice husk , nut shell, coconut shell, pea nut, sugarcane bagassage, tamarind wood, saw dust and industrial waste products.