Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 57, Issue 15, Pages 2374-2392Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2022.2064874
Keywords
Polypropylene; sulfonation; methylene blue; adsorption; kinetics; thermodynamics
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This study investigated the effectiveness of converting polypropylene waste into sulfonated microparticles for removing dyes from wastewater. The results showed that waste PP can be recycled into a valuable adsorbent for the removal of cationic dyes from polluted water after proper treatment such as sulfonation.
Dyes discharged into waste streams have threatened the lives of aquatic ecosystems and human beings. This work studied the effectiveness of converting polypropylene (PP) waste films into sulfonated microparticles (SPP) for removing methylene blue dye (MB) from aqueous solutions. PP waste was recycled into microparticles (8 mu m) and sulfonated in sulfuric acid at 100 degrees C for (6 h). FT-IR analysis proved the existence of sulfonic, carboxylic, and C = C groups on the surface of SPP microparticles. The concentration of acid groups, morphology, surface area, and wettability of SPP were investigated. The effects of the adsorbent dosage, contact time, pH of MB solution, temperature, and ionic strength on the adsorption process were studied. The experimental data of the adsorption process fit well with pseudo-second-order kinetic model and Langmuir isotherm disclosing that the adsorption was chemisorption. A maximum adsorption capacity of 45 mg MB g(-1) SPP microparticles was realized at 20 degrees C and neutral pH (6.5). The free energy change showed a negative value reflecting the feasibility and spontaneity of the adsorption process. Accordingly, waste PP can be recycled into a valuable adsorbent for the removal of cationic dyes from polluted water after a proper treatment such as sulfonation.
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