methylene blue

The isolation of microcrystalline cellulose from a groundnut shell is reported. Adsorption experiments were carried out for the removal of cationic crystal violet and methylene blue and it follows Langmuir model. Positive enthalpy and negative free energy changes have shown endothermic and favorable processes. The results reflect good adsorption process.

The present study aims to describe new low cost activated carbons which were prepared from bean peel (BP), acorn peel (AP) and Pistacia lentiscus (PL) under microwave induced KOH chemical activation for the removal of methylene blue dye from aqueous solutions. Activated carbons were characterized using, thermogravimetric analysis, and scanning electron microscopy. The adsorption properties were examined considering several parameters including the effect of pH, contact time, adsorbent dosage and initial concentration.

Photodegradable polystyrene-catalyst (PS-TiO2/SiO2) composite was prepared and characterized, and its degradation under sunlight was investigated. The morphology of TiO2/SiO2 was amorphous with particle size of 16.6–30.1 nm and the energy gap of the catalyst was calculated. The degradation process was for 288 h, the samples under investigation were two types standard (STD) samples – a mixture of PS with catalyst, and municipal waste residues (MWR) – a combination of PS-catalyst with MWR. The degradation was measured in dark and under sunlight.

Cr2(MoO4)3 and N-doped Cr2(MoO4)3 are prepared by sol-gel and solid state methods, respectively. These molybdates are characterized by powder X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetric analysis, FT-IR and UV-visible diffuse reflectance spectroscopy. The photodegradation of methylene blue solution was investigated in the presence of these oxides.