Modelling and Optimization of Indigo Carmine Adsorption onto P(NIPAM-co-AN)/Clay Composite Using Response Surface Methodology

Abstract

In the present work, a new polymeric adsorbent; Poly(NIPAM-co-AN)/clay composite was prepared via in-situ polymerization. The copolymerization of N-isopropylacrylamide, acrylonitrile and calculated clay (about 5% w/w) were carried out at 65°C in the presence of 10 mL 1,4-dioxane using AIBN as an initiator. Characterization of P(NIPAM-co-AN)/clay composite was determined by FT-IR techniques. NIPAM-AN/clay composite has been used as a novel adsorbent to remove indigo carmine dye from synthetic effluents. Three important process parameters i.e., initial IC concentration (5-30 mg/L), adsorbent dosage (0.01-0.08 g) and contact time (10–180 min) were modeled and optimized to get the best response of indigo carmine removal using a Central Composite Design assembled with Response Surface Methodology. The amount of indigo carmine in the solution was measured using a UV-visible spectrophotometer at a wavelength of 650 nm. Based on the ANOVA statistical value, the adsorption of indigo carmine onto P(NIPAM-co-AN)/clay composite is highly significant, with very low probability value (p<0.001). Twenty test runs were performed and the optimal conditions for indigo carmine adsorption were observed at initial indigo carmine concentration of 17.68 mg/L, the adsorbent dosage of 0.06 g and reaction time 115.47 min. The maximum indigo carmine adsorption efficiency under optimal conditions was 76.21%. It was concluded that NIPAM-AN/clay composite has the potential for removal of IC from aqueous solutions.

Keywords

• adsorption
• polymeric adsorbent
• Response Surfaca Methodology

Cevap Yüzey Metodolojisi Kullanılarak P(NIPAM-co-AN)/Kil Kompozit Üzerine İndigo Karmin Adsorpsiyonunun Modellenmesi ve Optimizasyonu

Abstract

Bu çalışmada yeni bir polimerik adsorban olan Poli(NIPAM-co-AN)/kil kompoziti yerinde polimerizasyon ile hazırlanmıştır. N-izopropilakrilamid, akrilonitril ve uygun miktarda alınan kilin (yaklaşık %5 w/w) kopolimerizasyonu, 10 mL 1,4-dioksan varlığında 65°C'de, AIBN (azobisizobütironitril) başlatıcısı varlığında gerçekleştirildi. NIPAM-AN/kil kompoziti IC (indigo karmin) boyasını sentetik atık sulardan uzaklaştırmak için yeni bir adsorban olarak kullanılmıştır. Üç önemli proses parametresi olan başlangıç indigo karmin konsantrasyonu (5-30 mg/L), adsorban dozu (10-80 mg) ve temas süresi (10-180 dakika) yanıt yüzeyi metodolojisi (RSM) ile birleştirilmiş. Merkezi Kompozit Tasarım (CCD) kullanılarak modelleme yapıldı ve en iyi indigo karmin giderme yanıtını elde etmek için optimize edildi. Çözeltideki indigo karmin miktarı, 650 nm dalga boyunda bir UV-görünür spektrofotometre kullanılarak ölçülmüştür. ANOVA (varyans analizi) istatistiksel değerine dayalı olarak, indigo karminin P(NIPAM-co-AN)/kil kompoziti üzerine adsorpsiyonu, çok düşük olasılık değeriyle (p<0.001) oldukça önemlidir. Yirmi test yapıldı ve indigo karmin İK adsorpsiyonu için optimal koşullar, 17.68 mg/L'lik ilk indigo karmin konsantrasyonunda, 60 mg'lık adsorban dozajında ve 115.47 dakikalık reaksiyon süresinde gözlemlendi. Optimum koşullar altında maksimum indigo karmin adsorpsiyon verimi %76.21’ dir. NIPAM-AN/kil kompozitinin indigo karminin sulu çözeltilerden uzaklaştırılması potansiyeline sahip olduğu sonucuna varılmıştır.

Keywords

• Adsorpsiyon
• polimerik adsorban
• Cevap Yüzey Yöntemi

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