Chitosan bi-metal oxide (CBMO) is prepared by co-precipitation method to determine the degradation ability of methylene blue (MB) and methyl orange (MO) dyes using solar light irradiation. The characteristics of CBMO are studied by FTIR, UV, SEM, EDX and XRD studies. The photocatalytic degradation of studies MB and MO were carried out by varying the parameters such as pH, irradiation time, dye concentration, composite dosage. The photo catalytic study shows the maximum percentage of degradation at pH 8 for MB and 3 for MO at irradiation time of 120 min and 0.15 g of CBMO and is confirmed by UV spectral studies. Based on the equilibrium data value Langmuir isotherm is well fitted, which indicates the formation of strong monolayer and it obeys pseudo second order kinetic model. Among methylene blue and methyl orange dyes, methyl orange was highly degraded (74.05%) by the chitosan-bimetal oxide adsorbent. And also 62.05% of dyes can be removed from industrial waste water by CBMO. According to the experimental results it is clearly evident that the chitosan-bimetal oxide composite is expected to be an effective product for the remediation of dyes from waste water.

The ability of chitosan silica composite for the degradation of methylene blue dye from aqueous solution is studied by direct sunlight irradiation. Batch mode adsorption experiments are carried out to know the degradation capacity of the composite. Maximum removal efficiency 89.05 % of methylene blue is achieved at pH 10 with composite dosage of 0.1 g. Langmuir and Freundlich adsorption isotherm models are used to fit the obtained adsorption data. The maximum adsorption capacity is found to be 11.467 mg/g for the adsorption of methylene blue. The kinetic data is well fitted with pseudo first order kinetics. Degradation ability of methylene blue is confirmed by UV spectra studies.

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