The Atrazine Removal with the Polyaniline Coated Rice Husk as a Cheap Adsorbent

Abstract

In this study, a composite of rice husk (RH) modified with polyaniline (PANI) was produced and its potential as an adsorbent in removal of atrazine was investigated. Within the scope of the study, the effects of contact time (0-480 min), initial pH (3.5- 9.5), initial atrazine concentration (2-25 mg/L), and PANI/RH amount (0-1.6 g) on treatment efficiency were examined. The optimum treatment efficiency for atrazine (25 mg/L) was found as 58.3% under 120 min., 5.4 of pH, and 1.0 g/50 ml of adsorbent dosage, and at this condition, adsorption capacities (qt) was calculated as 0.58 mg/g. Furthermore, when the initial atrazine concentration was raised from 2 to 25 mg/L, the removal efficiencies decreased from 81.1 to 60.4 %, but the adsorption capacities (qt) increased from 0.067 to 0.629 mg/g. In addition, the efficiency of the adsorption process was evaluated by applying Langmuir and Freundlich isotherm models. Among the performed isotherm models, Freundlich isotherm provided the best correlation for atrazine and the Freundlich constant related to the sorption capacity was calculated as 2.02 mg/g at an initial pH of 5.4 for the 2.0-25 mg/L atrazine at 25 oC. Raw-PANI/RH and used-PANI/RH composites were characterized with FTIR, XRD, and SEM analysis.

Keywords

• Adsorption
• Atrazine
• Polyaniline
• Rice Husk

Polianilin Kaplı Prinç Kabuğunun Atrazin Giderimi Üzerine Etkinliği

Abstract

Literatürde pestisitler için en çok çalışılan uzaklaştırma işlemlerinden biri adsorpsiyondur. Adsorpsiyon prosesi, kesikli proseslerle birçok kirleticinin giderilmesinde çok yüksek arıtma verimleri sağlasa da, tüketilen adsorbanın maliyeti prosesin kullanılabilirliğini sınırlayan en önemli faktördür. Son yıllarda bilim adamları, proses maliyetlerini azaltmak için kompozit adsorbanlara odaklanmışlardır. Bu çalışmada, pirinç kabuğu (RH) (çok ucuz bir doğal üründür) ve polianilin (PANI; yüksek maliyetli ve yüksek arıtma verimi sağlar) kompoziti üretilmiş ve atrazin gideriminde adsorban olarak potansiyeli araştırılmıştır. Çalışma kapsamında atrazin giderimi üzerine uygulama süresi (0-480 dk), başlangıç pH (3.5-9.5), başlangıç atrazin konsantrasyonu (2-25 mg/L) ve PANI/RH miktarının (0-1.6 g) etkileri incelenmiştir. Atrazin (25 mg/L) için optimum arıtma verimi 120 dakika, 5.4 pH ve 1.g/50 ml adsorban dozunda % 58.3 olarak bulunmuş ve bu durumda adsorpsiyon kapasiteleri (qt) 0.58 mg/g olarak hesaplanmıştır. Ayrıca, başlangıç atrazin konsantrasyonu 2'den 25 mg/L'ye yükseltildiğinde, giderim verimlerinin % 81.1'den % 60.4'e düştüğü, ancak adsorpsiyon kapasitelerinin (qt) 0.067'den 0.629 mg/g'ye yükseldiği belirlenmiştir.

Keywords

• Adsorpsiyon
• Atrazin
• Polianilin
• Pirinç Kabuğu

Supporting Institution

Bilecik Şeyh Edebali Üniversitesi

Thanks

Bilecik Şeyh Edebali Üniversitesine desteklerinden dolayı teşekkür ederim.

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