Doğal adsorban olarak zeolit (Bigadiç/Balıkesir) ile sulardan ağır metal gideriminin incelenmesi
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Tarih
2014
Yazarlar
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Yayıncı
Aksaray Üniversitesi Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada zeolit ile üç farklı ağır metalin (Cr3,6+, Ni2+, Cu2+) sucul ortamdan adsorpsiyon yöntemiyle giderimi araştırılmıştır. Adsorblayıcı madde olarak Balıkesir/Bigadiç bölgesinden temin edilen zeolit kullanılmıştır. Adsorpsiyon izotermlerinin ve termodinamik çalışmalarının yanında; adsorpsiyon verimi üzerine etkisi olan faktörler (karıştırma süresi, adsorban madde miktarının değişimi, adsorban madde boyutu, karıştırma hızı, pH değişimi, ortam sıcaklığı) her bir ağır metal için ayrıntılı olarak incelenmiştir. Seçilen her metal için Freundlich ve Langmuir adsorpsiyon izotermleri, pseudo 1. derece ve pseudo 2. derece adsorpsiyon hız kinetikleri, termodinamik parametreler (?G0, ?H0, ?S0 değerleri) ile adsorpsiyon kapasiteleri hesaplanmıştır. Tüm metallerin pseudo 2. derece kinetiğe ve freundlich izotermine uygun olduğu görülmüştür. Qe ve KF değerleri sırasıyla Cr+3 için 1,89 ve 3,11, Cu için 1,16 ve 2,66, Ni için 3,00 ve 4,29 olarak bulunmuştur. Cr+3 293 ºK'de ?G0 değeri -1,98 kJ/mol, 298 ºK'de -2,83 kJ/mol, 303 ºK'de -4,41 kJ/mol olarak bulunmuştur. ?H0 ve ?S0 değerleri sırasıyla 5,79 kJ/mol ve 0,02 kJ/mol.K 'dir. Cu 293 ºK'de ?G0 değeri -5,56 kJ/mol, 298 ºK'de -5,45 kJ/mol, 303 ºK'de -5,43 kJ/mol olarak bulunmuştur. ?H0 ve ?S0 değerleri sırasıyla -9,56 kJ/mol ve -0,02 kJ/mol.K'dir. Ni 293 ºK'de ?G0 değeri 1,81 kJ/mol, 298 ºK'de 0,76 kJ/mol, 303 ºK'de 0,19 kJ/mol olarak bulunmuştur. ?H0 ve ?S0 değerleri sırasıyla 4,00 kJ/mol ve 0,01 kJ/mol.K'dir. Cr+3 ve Ni için optimum tanecik boyutu 120 mesh, Cu için 230 mesh, optimum karıştırma hızı Cr+3 için 250 devir/dk, Cu için 200 devir/dk ve Ni için 50 devir/dk, optimum pH ise her bir ağır metal için 5 olarak bulunmuştur.
In this study, three different heavy metals (Cr3,6+, Ni2+, Cu2+) removal of the prepared the aquatic environment with natural zeolite adsorbent were studied. As an absorbent zeolite that taken from Balıkesir/Bigadiç was used. In addition adsorption isotherms and the work of thermodynamics, adsorption processes influencing mixing time, variation of the quantity of adsorbents, adsorbent particle size, stirring speed, pH changes, such as ambient temperature factors were investigated in detail for each heavy metal. Correlation coefficients were calculated by obtaining Freundlich and Langmuir adsorption isotherms for each heavy metal. Adsorption kinetics and thermodynamics were determined from pseudo first order, second order, ?G0, ?H0, ?S0 equations and ion exchange capacity. According to experimental results the most appropriate adsorption isotherm Freundlich isotherm model were determined to be more appropriate of all metals was observed pseudo 2nd degree equation. Qe and KF values were calculated to be 1,89 and 3,11 for Cr+3, 1,16 and 2,66 for Cu, 3,00 and 4,29 for Ni. The values of ?G0 for Cr+3 in 293, 298, 303 ºK temperatures were calculated to be -1,98 kJ/mol, -2,83 kJ/mol, -4,41 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, 5,79 kJ/mol and 0,02 kJ/mol.K, respectively. The values of ?G0 for Cu in 293, 298, 303 ºK temperatures were calculated to be -5,56 kJ/mol, -5,45 kJ/mol, 303 -5,43 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, -9,56 kJ/mol ve -0,02 kJ/mol.K, respectively. The values of ?G0 for Ni in 293, 298, 303 ºK temperatures were calculated to be 1,81 kJ/mol, 0,76 kJ/mol, 0,19 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, 4,00 kJ/mol and 0,01 kJ/mol.K, respectively. Optimum adsorbent particle size 120 mesh for Cr+3 and Ni, 230 mesh for Ni, optimum stirring speed 250 rev/min for Cr+3, 200 rev/min for Cu and 50 rev/min for Ni, optimum pH values 5 for each heavy metal were calculated.
In this study, three different heavy metals (Cr3,6+, Ni2+, Cu2+) removal of the prepared the aquatic environment with natural zeolite adsorbent were studied. As an absorbent zeolite that taken from Balıkesir/Bigadiç was used. In addition adsorption isotherms and the work of thermodynamics, adsorption processes influencing mixing time, variation of the quantity of adsorbents, adsorbent particle size, stirring speed, pH changes, such as ambient temperature factors were investigated in detail for each heavy metal. Correlation coefficients were calculated by obtaining Freundlich and Langmuir adsorption isotherms for each heavy metal. Adsorption kinetics and thermodynamics were determined from pseudo first order, second order, ?G0, ?H0, ?S0 equations and ion exchange capacity. According to experimental results the most appropriate adsorption isotherm Freundlich isotherm model were determined to be more appropriate of all metals was observed pseudo 2nd degree equation. Qe and KF values were calculated to be 1,89 and 3,11 for Cr+3, 1,16 and 2,66 for Cu, 3,00 and 4,29 for Ni. The values of ?G0 for Cr+3 in 293, 298, 303 ºK temperatures were calculated to be -1,98 kJ/mol, -2,83 kJ/mol, -4,41 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, 5,79 kJ/mol and 0,02 kJ/mol.K, respectively. The values of ?G0 for Cu in 293, 298, 303 ºK temperatures were calculated to be -5,56 kJ/mol, -5,45 kJ/mol, 303 -5,43 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, -9,56 kJ/mol ve -0,02 kJ/mol.K, respectively. The values of ?G0 for Ni in 293, 298, 303 ºK temperatures were calculated to be 1,81 kJ/mol, 0,76 kJ/mol, 0,19 kJ/mol, respectively. ?H0 and ?S0 values were calculated to be, 4,00 kJ/mol and 0,01 kJ/mol.K, respectively. Optimum adsorbent particle size 120 mesh for Cr+3 and Ni, 230 mesh for Ni, optimum stirring speed 250 rev/min for Cr+3, 200 rev/min for Cu and 50 rev/min for Ni, optimum pH values 5 for each heavy metal were calculated.
Açıklama
Anahtar Kelimeler
Ağır Metal, Adsorpsiyon, Zeolit, İyon Değiştirme, Sucul Ortam, Heavy Metals, Lon Exchange, Aquatic Environment
