Synthesis and characterization of avocado pit activated carbon-incorporated chitosan composite beads for harnessing methylene blue adsorption: DFT insights and box-behnken design optimization

Journal of the Taiwan Institute of Chemical Engineers, Journal Year: 2025, Volume and Issue: 173, P. 106142 - 106142

Published: May 1, 2025

Language: Английский

Spent Coffee Ground-Based Materials Evaluated by Methylene Blue Removal

Processes, Journal Year: 2025, Volume and Issue: 13(5), P. 1592 - 1592

Published: May 20, 2025

Spent coffee grounds (SCG) are produced in large quantities during brewing, contributing to environmental concerns. Additionally, cationic dyes from textile, paper, and leather wastewater pose a major pollution issue. This study explores SCG as an adsorbent for methylene blue (MB) dye. A novel comparison of cleaning methods with warm water, accelerated solvent extraction (ASE), supercritical fluid (SFE), ultrasound-induced cavitation (US) is presented. In addition, the chemical modifications using acetylation, acid (HNO3), base (KOH) treatment that have not been reported before ATR-FTIR confirmed inclusion functional groups, example, nitro group treated HNO3, increase carboxylic groups samples KOH HNO3. SEM analysis revealed consistent porous texture across samples, SCG-SFE, SCG-US, SCG-HNO3 showing smaller pores, SCG-ASE displaying elongated cavities. Adsorption isotherm tests followed Freundlich Langmuir models, indicating favorable adsorption. The maximum adsorption capacity (qmax) varied among 65.69 mg/g (warm water) 93.32 (SFE). contrast, base- acid-treated SCG, three- four-fold was observed, qmax values 171.60 270.64 mg/g, respectively. These findings demonstrate washed water chemically achieves capacities comparable other biosorbents literature. Therefore, represents promising, low-cost, sustainable material removing wastewater, waste valorization protection.

Language: Английский

Lignin-Furanic Rigid Foams: Enhanced Methylene Blue Removal Capacity, Recyclability, and Flame Retardancy

Polymers, Journal Year: 2024, Volume and Issue: 16(23), P. 3315 - 3315

Published: Nov. 27, 2024

Worldwide, populations face issues related to water and energy consumption. Water scarcity has intensified globally, particularly in arid semiarid regions. Projections indicate that by 2030, global demand will rise 50%, leading critical shortages, further the impacts of climate change. Moreover, wastewater treatment needs development, given presence persistent organic pollutants, such as dyes pharmaceuticals. In addition, continuous increase rising prices directly impact households businesses, highlighting importance savings through effective building insulation. this regard, tannin-furanic foams are recognized promising sustainable due their fire resistance, low thermal conductivity, high chemical stability. study, tannin lignin rigid were explored not only for traditional applications but also versatile materials suitable treatment. Furthermore, a systematic approach demonstrates complete replacement tannin-furan foam phenol source with two lignins mainly differ molecular weight pH, well how these parameters affect structure methylene blue (MB) removal capacity. Alkali-lignin-based exhibited notable MB adsorption capacity (220 mg g−1), kinetic equilibrium data analysis suggesting multilayer process. The prepared demonstrated ability be recycled at least five adsorption-desorption cycles flame retardant properties. When exposed butane 5 min, did release smoke or ignite, nor they contribute propagation, red glow dissipating 20 s after exposure.

Language: Английский