Highly efficient hexavalent chromium removal using nano-Fe3O4/pomegranate peel biochar/Alginate composite as an advanced biosorbent

Yıl 2025, Cilt: 7 Sayı: 1, 22 - 32, 31.01.2025

Şerife Parlayıcı , Erol Pehlivan

https://doi.org/10.51435/turkjac.1595052

Öz

In this study, a novel composite – nano-Fe₃O₄/pomegranate peel biochar/alginate hydrogel beads (nFe₃O₄-PPBC/Alg) – was synthesized as an alternative adsorbent for removing Cr(VI) ions from aqueous solutions. The adsorbent material was characterized using FT-IR analysis and scanning electron microscopy (SEM). Cr (VI) removal efficiencies were calculated using the standard batch adsorption method to determine the optimal pH, adsorbent dose, contact time, and initial concentration. Various adsorption isotherms, such as Freundlich, Langmuir, and Dubinin–Radushkevich, were employed to describe the adsorption behavior at equilibrium. The Langmuir adsorption isotherm was found to be the most suitable for describing the observed adsorption phenomena, with the adsorption capacity of nFe₃O₄-PPBC/Alg determined to be 303.03 mg/g for Cr (VI). To investigate the adsorption processes on the nFe₃O₄-PPBC/Alg, kinetic models, including pseudo-first-order and pseudo-second-order models, were applied. The pseudo-second-order kinetic model provided the best fit to the experimental data. This study demonstrated that nFe₃O₄-PPBC/Alg is an effective adsorbent for the removal of Cr (VI) from aqueous solutions.

Anahtar Kelimeler

Alginate, Biochar, Cr (VI), nano-Fe3O4, Kinetics, Pomegranate peel

Gelişmiş bir biyosorbent olarak nano-Fe3O4 / nar Kabuğu biochar / aljinat Kompozit kullanılarak yüksek verimli altı değerlikli krom giderimi

Öz

Bu çalışmada, yeni bir kompozit – nano-Fe₃O₄/nar kabuğu biyokömür/aljinat hidrojel boncukları (nFe₃O₄-PPBC/Alg) – sulu çözeltilerden Cr(VI) iyonlarının uzaklaştırılması için alternatif bir adsorban olarak sentezlendi. Adsorban malzeme, FT-IR analizi ve taramalı elektron mikroskobu (SEM) kullanılarak karakterize edildi. Cr (VI) giderme verimlilikleri, optimal pH, adsorban dozu, temas süresi ve başlangıç konsantrasyonunu belirlemek için standart kesikli kap adsorpsiyon yöntemi kullanılarak hesaplandı. Dengedeki adsorpsiyon davranışını tanımlamak için Freundlich, Langmuir ve Dubinin-Radushkevich gibi çeşitli adsorpsiyon izotermleri kullanıldı. Langmuir adsorpsiyon izoterminin, gözlenen adsorpsiyon fenomenini tanımlamak için en uygun olduğu bulundu ve nFe₃O₄-PPBC/Alg adsorpsiyon kapasitesi Cr (VI) için 303.03 mg/g olarak belirlendi. nFe₃O₄-PPBC/Alg üzerindeki adsorpsiyon süreçlerini araştırmak için, sözde birinci dereceden ve sözde ikinci dereceden modeller dahil olmak üzere kinetik modeller uygulandı. Sözde ikinci dereceden kinetik model, deneysel verilere en iyi uyumu sağladı. Bu çalışma, nFe₃O₄-PPBC/Alg'nin sulu çözeltilerden Cr (VI)'nın uzaklaştırılması için etkili bir adsorban olduğunu göstermiştir.

Anahtar Kelimeler

Alginat, Biyokömür, Cr(VI), nano-Fe3O4, Kinetik, Nar Kabuğu

Kaynakça

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