EVALUATION OF Prosopis cineraria LEAF POWDERASALOW-COST BIOSORBENT FOR HEAVY METAL REMOVAL FROM WASTEWATER
This research evaluates the potential of Prosopis cineraria leaf powder as an efficient and cost-effective biosorbent for the elimination of Chromium (Cr 6+ ) and Lead (Pb 2+ ) ions from aqueous media. A series of batch adsorptionexperiments was conducted to examine the influence of key parameters such as pH, contact time, and initial metal ion concentration on biosorption efficiency. The adsorption characteristics were analysed using both the Langmuir and the Freundlich isotherm models, with the Freundlich model providing a better fit, indicating heterogeneousadsorption sites on the biosorbent surface. Optimal biosorption conditions were identified at pH 4 for Pb 2+ andpH5for Cr 6+ , with corresponding contact times of 90 minutes and 150 minutes, respectively, using a biosorbent doseof 10 g/l. The maximum adsorption capacities were recorded as 5.22 mg/g for Pb 2+ and 4.04 mg/g for Cr 6+ , withcorresponding adsorption efficiencies of 75.39% and 70%, respectively. Kinetic studies and regenerationexperiments confirmed the reusability of the biosorbent, particularly with successful desorption using HCl, highlighting its potential for sustainable application. The results underscore the viability of Prosopis cinerarialeaf powder as an eco-friendly and sustainable alternative to conventional adsorbents, which harmonise with the UnitedNations Sustainable Development Goals. Specifically, the findings support SDG-6 by offering a low-cost, accessiblesolution for water purification, SDG-12 by promoting the reuse of natural biomass, and SDG-13 by mitigatingpollution impacts linked to industrial effluents. This work paves the way for greener technologies in environmental remediation and responsible resource management.
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