Color Removal from Aqueous Solution with Pyrolysis-Treated Rice Straw

Öz

The objective of this study is to evaluate the performance of pyrolysis-treated rice straw (PPS) in the removal of methylene blue (MB) from aqueous solution. Batch studies were performed to evaluate the influences of various experimental parameters like pH (4, 5.9 (natural pH), 7, 9 and 11), initial dye concentration (5, 10, 15, and 20 mg/L), and contact time (0, 1, 5, 15, 30, 60, 90, and 120 min) at constant temperature (20 ^oC) and adsorbent dose (1 g/L). Also; the effect of ionic strength with the salt addition at different doses (500, 1000, 1500, 2000, and 2500 mg/L NaCl) was evaluated on the color removal efficiency from the dye solution. It was observed that the dye uptake by PPS was slightly decrease (from 8.5 mg/g to about 8.2 mg/g for qe values) when the pH of dye solution was increased from 4 to 11 and the best removal efficiency was obtained at the natural pH (5.9). Uptakes of dye were rapid and the adsorption increased with increasing contact time in all experiments. Methylene Blue removal efficiency increased slightly with increasing ionic strength. While the removal efficiency was 91 % at 2000 mg/L NaCl application, decreased to 87% at 2500 mg/L NaCl. According to the R² values for the adsorption of MB on PPS, Langmuir model yields fit better than the Freundlich model. The maximum adsorption capacity of PPS adsorbent for MB dye was 12.5 mg/g. The kinetic experimental data fitted the pseudo-first-order model for PPS (R²=0.9952).

Anahtar Kelimeler

• Rice Straw,Pyrolysis,Adsorption,Methylene Blue,Color Removal

Piroliz Uygulanmış Çeltik Sapları ile Sulu Çözeltilerden Renk Giderimi

Öz

Bu çalışmanın amacı, piroliz uygulanmış pirinç sapları ile (PPS) sulu çözeltilerden metilen mavisi (MB) giderim performansını değerlendirmektir. pH (4, 5.9 (doğal pH), 7, 9 ve 11), başlangıç boya konsantrasyonu (5, 10, 15 ve 20 mg / L) ve temas süresi (0, 1, 5, 15, 30, 60, 90 ve 120 dakika) gibi çeşitli deneysel parametrelerin etkisini değerlendirmek için sabit sıcaklıkta (20 ^oC) ve sabit adsorban dozunda (1 g/L) kesikli çalışmalar yapılmıştır. Ayrıca; farklı dozlarda (500, 1000, 1500, 2000 ve 2500 mg/L NaCl) tuz ilavesiyle iyonik şiddetin boya çözeltisinden renk giderim verimi üzerine etkisi değerlendirilmiştir. Boya çözeltisinin pH değerinin 4’ten 11’e yükseltilmesiyle PPS tarafından boya tutulumunun bir miktar azaldığı (qe değerleri için 8.5 mg/g’dan yaklaşık 8.2 mg/g’a) ve en iyi giderme veriminin doğal pH’ta elde edildiği gözlenmiştir. Bütün deneylerde boya tutulumu hızlı olmakta ve artan temas süresi ile birlikte adsorpsiyon artmaktadır. Metilen mavisi giderim verimi artan iyonik şiddet ile birlikte hafif artış göstermiştir. 2000 mg/L NaCl uygulamasında %91 giderme verimi elde edilirken, 2500 mg/L NaCl uygulamasında giderme verimi % 87’e düşmüştür. PPS ile MB adsorpsiyonunda R² değerleri dikkate alındığında Freundlich modeline göre Langmuir modelinin daha uyumlu olduğu belirlenmiştir. MB boyarmaddesi için PPS adsorbanının maksimum adsorpsiyon kapasitesi 12.5 mg/g’dır. PPS için deneysel kinetik veriler yalancı birinci derece modele uyumludur (R²=0.9952).

Anahtar Kelimeler

• Pirinç Sapı,Piroliz,Adsorpsiyon,Metilen Mavisi,Renk Giderimi

Kaynakça

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