Olgun Güven, Pınar Akkaş Kavaklı, Cengiz Kavaklı

4-Vinil piridin aşılanmış Cu(II)-yüklenmiş polimerik ligand değiştiriciler kullanılarak sulu çözeltilerden As(V) uzaklaştırılması

As(V) uzaklaştırılmasında kullanılmak üzere polimerik ligand değiştirici (PLE) fiber adsorbent hazırlamak amacıyla, 4-vinil piridin (VP) monomeri radyasyonla başlatılan aşı polimerizasyonu (RIGP) tekniği kullanılarak, polietilen (PE/PP) ile kaplanmış polipropilen (PE/PP) dokumasız kumaşlar (NWF) üzerine emülsiyon ortamında aşılanmıştır. 4-vinil piridin aşılama koşulları optimize edilmiş ve yaklaşık % 150 VP aşılanan örnekler adsorpsiyon deneylerinde kullanılmıştır. As(V) uzaklaştırılması için uygun polimer ligand değiştirici (PLE) hazırlanması için, VP aşılanmış dokumasız kumaş fiberler Cu(II) iyonları ile yüklenmiştir. PLE’nin bakır yükleme kapasitesinin 0.5 mmol Cu(II)/g polimer olduğu belirlenmiştir. As(V) adsorpsiyon deneyleri, kesikli yöntemde farklı adsorpsiyon zamanı, pH (3-9) ve başlangıç As(V) konsantrasyonlarında gerçekleştirilmiştir. PLE adsorbent üzerine As(V) adsorpsiyonunun hızlı olduğu gözlenmiş ve adsorpsiyon dengesine 4 saat içinde ulaşılmıştır. Cu(II) yüklenmiş VP aşılanmış NWF tarafından adsorplanan As(V) miktarının geniş pH aralığında önemli bir değişiklik göstermediği tespit edilmiştir. PLE’nin adsorpsiyon davranışı üzerine başlangıç As(V) konsantrasyonunun etkisi, farklı As(V) konsantrasyonlarında (0.1-500 ppm) pH 7’de belirlenmiştir. Yeni PLE adsorbentinin, As(V) için yüksek afinite gösterdiği gözlenmiştir. Langmuir izoterminden maksimum adsorpsiyon kapasitesi, 51 mg As(V)/g PLE olduğu bulunmuştur. Langmuir izoterminden bulunan teorik adsorpsiyon kapasitesinin, 47 mg As(V)/g PLE olarak bulunan deneysel adsorpsiyon kapasitesi ile uyumlu olduğu bulunmuştur.

Removal of As(V) from aqueous solutions using Cu(II)-loaded 4-vinyl pyridine grafted polymeric ligand exchanger

In order to prepare fibrous polymeric ligand exchanger (PLE) adsorbent for the removal of As(V), 4-vinyl pyridine (VP) monomer was first grafted onto polyethylene/polypropylene nonwoven fabrics (NWF) made of polypropylene coated by polyethylene (PE/PP) in emulsion medium by using radiation induced graft polymerization (RIGP). 4-Vinyl pyridine grafting conditions were optimized and about 150% VP grafted samples were used for further experiments. For the preparation of the suitable polymer ligand exchanger (PLE) for the removal of As(V), VP grafted NWF were loaded with Cu(II) ions. Copper loading capacity of PLE was determined to be 0.5 mmol Cu(II)/g polymer. As(V) adsorption experiments were performed in batch mode at different contact time, pH (3-9) and initial As(V) concentrations. The As(V) adsorption rate onto PLE adsorbent was rapid and adsorption equilibrium was established within 4 hours. It was found that As(V) adsorption by Cu(II) loaded VP grafted NWF did not change significantly over a wide pH range. The effect of initial concentration of As(V) on the adsorption behaviour of PLE was determined for different As(V) concentrations (0.1-500 ppm) at pH 7. The new PLE showed high affinity for As(V), the maximum adsorption capacity was found to be 51 mg As(V)/g PLE from Langmuir isotherm. It was found that the theoretical capacity found from Langmuir isotherm is very good accordance with experimental capacity 47 mg As(V)/g PLE.

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