Birsen DEMİRATA ÖZTÜRK, Fatoş Ayça ÖZDEMİR OLGUN

Hümik Asit/Kuversetin Kaplı Fe3O4 Manyetik Nanoparçacıklar ile Cu2+ ve Ni2+ Metallerinin Adsorpsiyon Yöntemiyle Giderimi

Endüstriyel atıksulardan metal ya da ağır metal giderilmesi su sistemleri için ciddi sorunlar oluşturabilmektedir. Bu çalışmada, bu sorunları tamamen gidermek ya da en aza indirmek için bir çözüm yolu önerildi. Çalışma kapsamında, literatürde ilk kez, doğal polimer olan hümik asit sodyum tuzu ile kaplı olduğu için çevre dostu olan, ekonomik ve manyetik özelliğinden dolayı kullanım kolaylığı sağlayan HA/QR manyetik nanoparçacıklar sentezlendi. Sentez prosedürünün birinci adımında birlikte çöktürme tekniğiyle Fe3O4 manyetik nanoparçacıklar sentezlendi ve çekirdek-kabuk (core-shell) modeline uygun olarak hümik asit çözeltisi ile muamale edilerek kaplandı. İkinci adımda ise, sentezlenen partiküller kuersetin çözeltisi ile kaplandı. Oluşan nano yapının aydınlatılması için SEM (Taramalı Elektron Mikroskopisi), X ışını kırınımı (XRD) ve parçacık boyut analizi teknikleri kullanıldı. Yeni sentezlenen parçacıklar Cu2+ ve Ni2+ metallerinin giderimi için adsorban olarak başarıyla kullanıldı. pH=7 değerinde 0.03 g adsorban kullanılarak hesaplanan adsorpsiyon kapasiteleri Cu2+ için 14.61 mg/g; Ni2+ için 28.30 mg/g olarak hesaplandı. Adsorpsiyon izotermleri değerlendirildiğinde, elde edilen adsorpsiyon izoterm eğrisinin hem Langmuir hem Freundlich modeline uyum sağladığı gözlemlendi.

Humic Acid/Quercetin Coated Magnetic Fe3O4 Nanoparticles For Adsorptive Removal of Cu2+ and Ni2+

Removal of metals and heavy metals from industrial wastewaters is a serious concern for water systems. In this study, environmentally friendly natural polymer coated, cost-effective, easy to operate HA/QR magnetic nanoparticles were suggested to overcome this problem, for the first time in literature. Fe3O4 magnetic nanoparticles were synthesized with co-precipitation technique and a core-shell structure was obtained with humic acid sodium salt (HA) solution. At the second step of the procedure, synthesized magnetic nanoparticles were coated with quercetin solution. Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and particle size analyses were performed to enlighten and characterize the structure. The newly synthesized nanoparticles were used for the batch-wise adsorption of copper and nickel metals, successfully. Maximum adsorption capacities were calculated as 14.61 mg/g for copper and 28.30 mg/g using 0.03 g adsorbents, at pH=7. Adsorption isotherms were evaluated and it was concluded that adsorption equilibrium fitted to both Langmuir and Freundlich isotherm models, better correlated with Langmuir isotherm model.

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