article · Chemical Physics Impact
This research evaluates the removal of methylene blue, a common textile dye, from contaminated water using the cactus species Opuntia ficus indica sourced from two regions, Beni Mellal and Sidi Bou Othmane. Using material characterisation techniques including FTIR, GTA/DTA, and X-ray analysis, the study compared the dye adsorption capabilities of the two plant materials. The cactus material from Sidi Bou Othmane showed a higher capacity to bind the dye compared to the sample from Beni Mellal, reaching maximum adsorption capacities of 333.33 mg/g and 263.15 mg/g, respectively, at a pH of 8. The adsorption process follows a pseudo-second-order kinetic model and aligns well with the Langmuir isotherm model. Thermodynamic assessments revealed that the binding of the dye onto both cactus types is spontaneous and exothermic.
Textile manufacturing frequently discharges harmful dyes such as methylene blue into waterways. Identifying low-cost, natural materials that effectively capture these pollutants offers a pathway toward cleaner industrial effluent. Understanding how natural variations in the same plant species affect treatment efficiency helps refine sustainable wastewater treatment approaches.
The findings could enable the development of bio-based water filtration materials for textile industrial facilities seeking to treat dye-laden wastewater. Given that the investigation is laboratory-based and limited to characterisation and kinetic modelling, the technology represents early-stage research that requires pilot testing and scale-up studies before real-world deployment.
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This paper is based on the adsorption in polluted water of Methylene Blue (MB) used in the textile industry, by the cactus (Opuntia ficus indica) of the city of Beni Mellal (CBM) and that of Sidi Bou Othmane (CSB). Different analyzes are used namely: (FTIR, GTA/DTA and X-ray). The equilibrium kinetics shows that the (CSB) fixes the (MB) better than the (CBM). It should be noted that at pH=8, Qmax up to 333.33 and 263.15 mg/g for (CSB) and (CBM) are obtained. The kinetic adsorption results are best described by the expression of the pseudo-second order model (P-SO). The adsorption isotherms of (MB) by (CBM) and (CSB) are suitably described by the Langmuir model. Thermodynamic analysis to show that the adsorption of MB on the cactus of Beni Mellal and Sidi Bou Othmane is an exothermic process and spontaneous.
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DOI: 10.1016/j.chphi.2023.100235
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