Sulu Çözeltiden Bakır (II) Adsorpsiyon Sürecinin Optimizasyonunda Yüzey Yanıt Metodolojisinin Uygulanması

Bu çalışmada sulu çözeltilerden Bakır (II) giderimi için ham Brassica Napus bitki sapları adsorban olarak kullanılmıştır. Kesikli adsorpsiyon deneylerinde sabit 120 dakikalık temas süresince, pH (2-10), metal çözelti derişimi (2-10 mg/L), adsorban miktarı (0.03-0.07 g), ve sıcaklık (30-50 °C) adsorpsiyon deney değişkenleri olarak seçilmiştir. Bu dört bağımsız değişken yüzey merkezli merkezi birleşik tasarımına dayanan yüzey yanıt yöntemi kullanılarak optimize edilmiştir. Bakır (II) adsorpsiyonu için optimum koşullar 7.3 mg/L bakır (II) iyon derişimi, 5.9 pH, 0.03 g adsorban miktarı ve 33 °C olduğu yüzey merkezli merkezi birleşik tasarım yöntemi ile bulunmuştur. Elde edilen bu optimum koşullarda, adsorbanının %79 kadar Bakır (II) ağır metal giderimini gerçekleştirdiği deneysel yöntemlerle hesaplanmıştır. Önerilen yüzey merkezli merkezi birleşik tasarımının iyi bir doğruluk ve yüksek regresyon katsayına (R2=0.992) sahip en iyi istatiksel yöntem olduğu bulunmuştur. Sonuçlar açık bir biçimde Brassica Napus bitki saplarının ucuz bir adsorban olarak Bakır (II) giderimi için kullanılabileceğini göstermektedir.

Application of Response Surface Methodology in the Optimization of Copper (II) Adsorption Process from Aqueous Solution

In this study, Brassica Napus straw was used as an adsorbent to eliminate Copper (II) from aqueous solution. In batch adsorption experiments with a fixed contact time of 120 min, experimental variables were selected as pH (2-10), metal solution concentration (2-10 mg/L), adsorbent dosage (0.03-0.07 g), and temperature (30-50 °C). These four independent variables were optimized using response surface methodology based on a four-independent variable face-centered central composite design. The optimum conditions for Copper (II) adsorption were found to be Copper (II) ion concentration of 7.3 mg/L, pH of 5.9, 0.03 g of adsorbent dosage, and temperature of 33 °C . At the optimized conditions, up to 79 % Copper (II) heavy metal ions managed to remove from heavy metal solution onto Brassica Napus straw. The face-centered central composite design proposed turned out be the best statistical model to predict the response with good accuracy and a high regression coefficient (R2=0.992). Results clearly suggest that Brassica Napus straw can be used for the Copper (II) adsorption as a low-cost adsorbent.

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