ERKEN, ESRA2022-10-212022-10-212022-10-01Hür C., ERKEN E., "Assessment of green tea-enabled iron/calcined bentonite nanocomposites for phosphate removal and recovery", Journal of Environmental Chemical Engineering, cilt.10, sa.5, 20222213-3437https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85137546477&origin=inwardhttps://hdl.handle.net/11424/282475© 2022 Elsevier Ltd.We suggest using green tea enabled iron nanoparticles supported on calcined bentonite (G-nZVI/B) to remove and recover phosphate from synthetic wastewater. The nanocomposites are proposed as an eco-innovative adsorbent material for wastewater treatment plants. Adsorption columns packed with this novel nanocomposite would help overcome the footprint obstacle of wastewater treatment plants in a cost-effective way. We assessed the effect of various iron (Fe) /calcined bentonite (Cal-B) mass ratios (2 g Cal-B/2 g Fe, 2 g Fe, 2 g Cal-B/0.56 g Fe) and Fe/Green tea extract (GT) volumetric ratios (1/1, 1/0.5, 1/0.1) in 9 different nanocomposites (G-nZVI/B). The nanocomposites were characterized using BET, SEM, TEM, FT-IR, XRD, and XPS. The recipe for the optimized nanocomposite composition was found as follows: NC2 (Fe: 2 g, Calcined bentonite: 2 g, Fe/Green tea extract: (1/0.5) (V/V)). TEM analysis demonstrated that size of the iron nanoparticles (INPs) was within the range of 8-30 nm for NC2. Adsorption isotherms and kinetic models were carried out with the optimized nanocomposite under the following conditions: Room temperature; adsorbent dosage = 5 g/L; initial phosphate concentration: 10-900 mg/L, and contact time = 5-1500 min. The results revealed that the maximum adsorption capacity was 58.60 mg/g using Sips model (R2 = 0.959), and the adsorption rate constant was 23.017 mg/(g.min) using Elovich model (R2 = 0.971). Chemisorption was suggested to be the major mechanism of phosphate removal from an aqueous solution. The adsorption and recovery efficiencies were determined to be 98.60% and 53.48% using 1 g of NC2 with 50 mg/L initial phosphate concentration.enginfo:eu-repo/semantics/closedAccessKimya Mühendisliği ve TeknolojisiKimyaDiğerTemel BilimlerMühendislik ve TeknolojiChemical Engineering and TechnologyChemistryOtherNatural SciencesEngineering and TechnologyMühendislik, Bilişim ve Teknoloji (ENG)Temel Bilimler (SCI)MühendislikMÜHENDİSLİK, ÇEVREMÜHENDİSLİK, KİMYASALKİMYA, UYGULAMALIEngineering, Computing & Technology (ENG)Natural Sciences (SCI)ENGINEERINGCHEMISTRYENGINEERING, ENVIRONMENTALENGINEERING, CHEMICALCHEMISTRY, APPLIEDKimya Mühendisliği (çeşitli)Fizik BilimleriAtık Yönetimi ve BertarafıKirlilikProses Kimyası ve TeknolojisiChemical Engineering (miscellaneous)Physical SciencesWaste Management and DisposalPollutionProcess Chemistry and TechnologyAbbreviations GT Green teaBET Brunauer-Emmett-TellerBJH Barrett, Joyner and HalendaCal-B Calcined bentoniteDH Dollimore and HealEDS X-ray spectroscopyFT-IR Fourier transform infraredG-nZVI/B Green synthesized iron nanoparticles supported on calcined bentoniteH-J Harkins-JuraINPs Iron nanoparticlesNRMSE Normalized root mean square errornZVI Nanoscale zero-valent ironPFO Pseudo-first orderPSO Pseudo-second orderR-D Radushkevich-DubininRaw-B Raw bentoniteSEM Scanning electron microscopyTEM Transmission electron microscopyXPS X-ray photoelectron spectroscopyXRD X-ray diffractionarticle10510.1016/j.jece.2022.108519