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

Abstract

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.

Keywords

• 4-vinyl pyridine,radiation induced graft polymerization,Cu II -loaded VP grafted adsorbent,As V adsorption

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

Abstract

A s 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 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

Keywords

• 4-vinil piridin,radyasyonla başlatılan aşı polimerizasyonu,Cu II -yüklenmiş VP aşılanmış adsorbent,As V adsorpsiyonu

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