No abstract

A direct single step solution combustion synthesis is adopted to prepare nano -Al 2 O 3 using aluminium nitrate as oxidizer and urea or hexamethylenetetramine (HMT) as fuel in the presence of a variety of surfactants. The obtained products were characterized by powder XRD and IR. The phase and size of the product was found to be depending on the nature of surfactant or fuel used. FESEM and TEM analysis of urea-surfactant based gamma alumina shows a fairly uniform spherical morphology of particle aggregates with lower nano size distribution of 40-60 nm. In HMT based -Al 2 O 3 the particle size was greater than 200 nm. DLS analysis of the sample also showed the narrow size distribution in the urea-surfactant based -Al 2 O 3 compared to HMT based -Al 2 O 3 which shows broad size distribution. The nano gamma alumina powders also show specific area of 160-240 m 2 g −1 . The urea-CTAB synthesized -Al 2 O 3 was tested for its fluoride adsorption, exhibited adsorption capacity of 6.49 mg · g −1 .

The “dark” homeotropic and “bright” random planar nematic gel states in the absence and presence of UV-light, respectively.

Globally, textile industries play an important role in the economy of many countries. A huge volume of water is consumed in the various processes of dyeing fabrics and the majority of this is discharged with heavy loads of pollutants into the environment. The present study assessed on quality of textile dyeing effluent by analyze the physicochemical parameters such as pH, color, electrical conductivity, turbidity and total dissolved solids, calcium, total hardness, dissolved oxygen, potassium, phenol, phosphates, nitrates, magnesium, and sulfates of the effluent were analyzed. The results of the analysis were correlated with the water quality standards of Environmental Pollution Agency and Bureau of Indian Standard.