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uijrt.com

United International Journal for Research & Technology UIJRT is an ISSN approved, open-access peer-reviewed journal for science & engineering paper publication.

gjesm.net

BACKGROUND AND OBJECTIVES: Heavy metal contamination from industrial wastewater remains a global concern. Biomass waste still contains active compounds that can be processed into useful materials. The study objectives were to address both problems by synthesizing composite hydrogels from pineapple crowns and avocado peels for the simultaneous adsorption of lead(II), cadmium(II), and copper(II) from aqueous solutions.METHODS: Composite hydrogels were synthesized using free radical polymerization using pineapple crown biochar and avocado peel biochar as grafting substrates. The material was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy-energy dispersive x-ray spectroscopy, Brunauer-Emmett-Teller, and hardness testing to determine its physicochemical properties. The adsorption process uses a batch system in a solution containing lead, cadmium, and copper ions simultaneously at potential 4 to 6 and a temperature of 26 degrees Celsius with a speed of 125 revolutions per minute for an operating time of 300 minutes. The kinetics of adsorption were evaluated using the pseudo-first-order and pseudo-second-order models, and the model fit was based on the coefficient of determination value and the correlation.FINDINGS: Both hydrogels demonstrated mesoporous structures with high specific surface areas (square meters per gram) of 767.61 for pineapple crown composite hydrogel and 802.41 for avocado peel composite hydrogel, along with rich functional groups such as hydroxyl, carboxyl, alkyl, nitrile, and carbonyl groups that facilitate chemisorption. The avocado peel composite hydrogel showed the highest adsorption capacity (milligrams per gram), which was 0.56 for lead, 0.43 for cadmium, and 0.41 for copper. These results were better than the performance of the pineapple crown composite hydrogel. Adsorption kinetics were well described by the pseudo-second-order model, with coefficient of determination values from 0.91 to 0.98 for compo

arabianjbmr.com

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sociology.org

Learn the psychology behind why we trust strangers driving us. Explore factors like technology, reputation, and social norms that build confidence in rideshare services.

kyosei-tairyu.jp

法事・法要とは故人の冥福を願い、供養を行う仏教の行事です。 古くは年配の方から教えてもらって自然と法事・法要の

eurjchem.com

european journal of chemistry

ekjm.org

Molecular Residual Disease Monitoring and Early Recurrence Prediction in Solid Tumors: Clinical Applications and Evidence

bmrat.org

martplace - complete online multipurpose marketplace html template

mhpi.chnu.edu.ua

історико-політичні проблеми сучасного світу