Assessment of green tea-enabled iron/calcined bentonite nanocomposites for phosphate removal and recovery

Hür C., ERKEN E.

Journal of Environmental Chemical Engineering, cilt.10, sa.5, 2022 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Sayı: 5
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.jece.2022.108519
  • Dergi Adı: Journal of Environmental Chemical Engineering
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, CAB Abstracts, Chemical Abstracts Core, Compendex, INSPEC, Veterinary Science Database
  • Anahtar Kelimeler: Abbreviations GT Green tea, BET Brunauer-Emmett-Teller, BJH Barrett, Joyner and Halenda, Cal-B Calcined bentonite, DH Dollimore and Heal, EDS X-ray spectroscopy, FT-IR Fourier transform infrared, G-nZVI/B Green synthesized iron nanoparticles supported on calcined bentonite, H-J Harkins-Jura, INPs Iron nanoparticles, NRMSE Normalized root mean square error, nZVI Nanoscale zero-valent iron, PFO Pseudo-first order, PSO Pseudo-second order, R-D Radushkevich-Dubinin, Raw-B Raw bentonite, SEM Scanning electron microscopy, TEM Transmission electron microscopy, XPS X-ray photoelectron spectroscopy, XRD X-ray diffraction
  • Marmara Üniversitesi Adresli: Evet

Özet

© 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.