Synthesis of chitosan hydrogel polymer for removal of radioactive organic research waste prior to treatment

ABSTRACT

Chitosan hydrogel polymer (CHGP) has been exploited as the second most abundant natural material in the environment for preparing a new adsorbent with a low cost, higher removal capacity of dyes, good stability overworking pH range and environmentally safe for treating aqueous solutions of organic pollutants Arsenazo-III (Ar-III) and Alizarin Red S (ARS). The characteristics of the prepared polymer were revealed through infrared analysis (FTIR) as well as a scanning electron microscope (SEM). Various factors affecting the treatment process were studied through batch experiments. These factors are the agitation time, pH, different polymer weights, and the initial concentrations of Ar-III and ARS dyes in the solution plus temperature. The Freundlich and Langmuir isothermal models were applied and the equilibrium data showed that they fit well with the Langmuir model for both the reagents removal processes. Based on this model, the maximum capacity values were estimated at 99.9 and 62.5 mg/g for Ar-III and ARS at ambient temperature, respectively. In terms of kinetics, we find that the adsorption process of both dyes onto the prepared CHGP polymer corresponds to the pseudo-first-order mechanism. Also, a suggested reaction mechanism was established based on the electrostatic, hydrogen bonding, and mainly pH. Through practical experience the optimum conditions for efficient removal of both Ar-III and ARS reagents (dyes) from contaminated radioactive solutions by using CHGP are the initial dye concentration 100 mg L-1, pH = 6, shaking time 120 min. and the polymer dose 0.01 g at ambient temperature. Finally, the results showed that the prepared polymer (CHGP) could be promisingly applied in removing both Ar-III and ARS dyes from radioactive waste solutions.

KEYWORDS:

• Chitosan
• hydrogel polymer
• adsorption
• reagents
• isotherm models

Authors’ contributions

In this work, A.A suggest the idea and put the discussion of manuscript, Mahmoud work on the result and Aly worked on the experimental and its written.

Data availability statement

All data generated or analyzed during this study are included in this published article.

Disclosure statement

The authors declare that they have no competing interests.

Additional information

Funding

No special funding for doing work except the routine suppliers by our institute.