Kinetics of Adsorption of Lead onto Low Cost Adsorbents: Comparison of Linear and Non-Linear Regression Methods

Öz

The purpose of this paper is to utilize common solid wastes (carbon rods from used batteries, egg shells and corn cobs) as adsorbents for lead removal from aqueous solution. For this purpose, linear and non-linear regression methods of widely used kinetics models were compared. Solid wastes (speci cally, egg shells, corn cobs and used dry batteries) were collected from selected location in Nigeria. The materials collected were washed with distilled water, air-dried, ground into powder and classi ed using British Standard sieve. The mineral contents of these adsorbents were determined. Adsorption capacities of powdered adsorbents were examined on synthetic lead solution prepared by using standard method. The results of adsorption capacities analysed using linear and non-lin- ear techniques were evaluated statistically. The present study re ected that these materials are good adsorbents based on the micrograph and adsorption capacities. In the result of the statistical evaluations, non-linear regression method is the best method to be used for: analysis adsorption kinetics model(intraparticle diffusion and pseudo sec- ond order) based on high MSC (2.54, 2.34 and 2.57; 4.45, 4.15 and 4.22) and CD (0.960, 0.951 and 0.961; 0.994, 0.992, 0.992); low error (0.375, 0.325 and 0.213; 2.994, 2.604 and 2.909) and Chi squared value (0.030, 0.030 and 0.020; 0.180, 0.190 and 0.200) and determination of engineering parameters to prevent failure of adsorption reac- tors. Cost analysis showed that these adsorbents are cheaper compared to the cost of producing other adsorbents such as pen con shell based activated carbon (2.72 USD kg-1) and sugar cane based granular activated carbon by steam (3.12 USD kg-1). 

Anahtar Kelimeler

• Pb2+ removal,PCC,aqueous solution,regression methods,environmental pollution control

Kurşunun Düşük Maliyetli Absorbent ile Absorbsiyonunun Kinetiği: Doğrusal ve Doğrusal Olmayan Regresyon Modellerinin Karşılaştırılması

Öz

Bu makalenin amacı, sıvı çözeltiden kurşun giderimini sağlamak amacıyla absorbentler olarak sıradan katı atıklardan (atık pillerin karbon çubukları, yumurta kabukları ve mısır koçanları) yararlanmaktır. Bu amaç için, kinetik modellerde yaygın olarak kullanılan doğrusal ve doğrusal olmayan modellerin karşılaştırılmıştır. Bu katı atıklar (atık kuru pillerin karbon çubukları, yumurta kabukları ve mısır koçanlar) Nijerya’nın belli bölgelerinden toplanmıştır. Toplanan materyallar, distile su ile yıkanıldıktan sonra hava ile kurutulmuş ve toz haline getirildikten İngiliz elek standartları ile sını andırılmıştır. Toz haline getirilen absorbentlerin absorbsiyon kapasiteleri, standart metotlar kullanarak hazırlanan sentetik kurşun çözeltisi ile incelenmiştir. Absorbsiyon kapasiteleri, doğrusal ve doğrusal olmayan analiz teknikleri ile değerlendirilmiş, elde edilen sonuçlar istatistiksel olarak değerlendirilmiştir. Çalışma sonuçları, mikrograf ve absorbsiyon kapasitelerine bağlı olarak incelenen materyallerin, iyi absorbent- ler olduğunu göstermiştir. Yapılan istatistiksel değerlendirmeler sonucunda, doğrusal olmayan modellerin, yüksek MSC (2.54, 2.34 ve 2.57; 4.45, 4.15 and 4.22) and CD (0.960, 0.951 ve 0.961; 0.994, 0.992, 0.992); düşük hata (0.375, 0.325 and 0.213; 2.994, 2.604 and 2.909) and ki-kare değerleri (0.030, 0.030 ve 0.020; 0.180, 0.190 ve 0.200) temelinde absorbsiyon kinetik modelleri (intra-partikül difüzyon ve pseudo ikinci mertebe) için kullanılan ve absorbsiyon reaktörlerinin başarısızlığını önleyen en iyi metot olduğu saptanmıştır. Maaliyet analizi, bu ab- sorbentlerin diğer absorbentlerden (aktive edilmiş karbona dayalı atıklar (2.72 USD kg-1) ve buharlı taneli aktif karbona dayalı seker kamışı (3.12 USD kg-1)) daha ucuz olduğunu göstermiştir. 

Anahtar Kelimeler

• Çevre kirliliği,Pb2+ giderimi,regresyon modeller,sıvı çözelti,Toz haline getirilmiş mısır koçanı (THGMK)

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