Abstract
The incorrect disposal of contaminated effluents from textile industries is a major contribution to their environmental impact. We aimed to use the chitosan biopolymer from industrial sources as a potential adsorbent agent. The experiments were performed in Jar-Test simulating an industrial scale treatment. Both pH and mass variations were analyzed. Our UV spectra results showed that all datasets fitted to the Langmuir model, indicating the formation of monolayers. Kinetics studies confirmed that adsorption follows a pseudo-second order model, in addition to a chemisorption pattern during adsorption. Kinetics studies also demonstrated intraparticle diffusion, which confirmed a strong adsorbate/adsorbent interaction with the dye. The Jar-Test proved to be an efficient system to simulate treatment of effluents on an industrial scale, thus ranking chitosan powder as a good adsorbent and eligible to future large-scale applications. Keywords: chitosan, intraparticle diffusions, chemisorption, isotherms, kinetics
Highlights
Water pollution is a major worldwide problems that has been constantly aggravated by increasing anthropogenic activities
The blades of the Jar-Test system had no difficulty in keeping constant stirring, proving that chitosan powder would be a viable material to upscaled industrial applications
The isotherms (Table 1) confirmed that for both pH the adsorption fitted best to the Langmuir model (Figure 5), indicating that a specific site of the adsorbent is interacting with the Direct Orange 2GL (DO 2GL) dye, forming a monolayer
Summary
Water pollution is a major worldwide problems that has been constantly aggravated by increasing anthropogenic activities. The residues of industrial processes and wastewater from domestic sewage are among the pollution sources that are often incorporated into rivers, especially when adequate and effective treatment methods are lacking. In this context, the textile industry is responsible for generating bulk effluents containing mainly synthetic dyes and toxic organic compounds, such as benzene, toluene, ethylbenzene, naphthalene, anthracene and xylene [1]. Dyes and their derivatives may present high toxicity levels with mutagenic and carcinogenic effects on exposed organisms [4]. The high organic load released into effluents changes local ecosystems due to the increase in water turbidity. The disposal of textile wastewaters lead to bioaccumulation and ecotoxicological processes [6]
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