Removal of heavy metals from aqueous solutions by low crosslinked chelating resins containing amidoxime groups
Çapraz bağ oranı düşük gözenekli yapıda şelatlayıcı amidoksime reçineleriyle sulu çözeltilerden ağır metal iyonlarının giderilmesi
- Tez No: 197689
- Danışmanlar: PROF. DR. NALAN KABAY, PROF. DR. MİTHAT YÜKSEL
- Tez Türü: Yüksek Lisans
- Konular: Kimya Mühendisliği, Mühendislik Bilimleri, Chemical Engineering, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2006
- Dil: İngilizce
- Üniversite: Ege Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Kimya Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 152
Özet
Heavy metals in industrial wastewaters generate detrimentaleffect on environment, human health and economy. The chelatingresins can be used for extraction of toxic metals in the natural andwaste waters, exhibiting greater selectivity for heavy metals.In this study, the macroporous chelating resins; RCSP(II)containing methylene phosphonic groups (DVB: 10 mol%),Xcommercially available Purolite C-160H containing sulphonic groups(DVB: 10 mol%), RNH-CH120 containing amidoxime groups (DVB:5 mol %) were used for metal removal from aqueous solutions bybatch and column methods. In batch studies performed in thelaboratory, the effect of pH and resin amount on Cu(II) removal fromaqueous solutions were investigated. In column studies, the resinperformances of two different kinds of resins on removal of Cu(II)were compared.Metal ion selectivity of chelating resins was studied bymeasuring pH dependency of distribution ratios of various metal ions(Cu(II), Cd(II), Cr(III)) by these resins using solutions containing10-4 M metal ions. Metal analysis was carried out by atomic absorptionspectrophotometer. The percent removal of Cr(III) and Cu(II) reacheda plateau with about 100% of removal at pH 2 and at pH 3 byRCSP(II) resin respectively. Commercial Purolite C-160H resinshowed a higher selectivity to Cu(II) ions than Cr(III) ions. Thepercent removals reached a plateau with about 80% of removal at pH6, 100% of removal at pH 6, 100% of removal at pH 7 on the RNH-CH120 resin, for Cr(III),Cu(II) and Cd(II) ions, respectively.The optimum resin amounts of Purolite C-160H and RNH-CH120 resins were determined for removal of Cu(II) from 100 mgCu(II)/L (pH:3.5) solution. The obtained results were used for thekinetic studies.Kinetic studies were performed by using Purolite C-160Hand RNH-CH120 resins. The kinetic data were applied on someXImathematical kinetic models and the rate controlling steps were found.In the kinetic studies of both resins, it was found that the reaction ratewas controlled by particle diffusion.In column studies, the resin performances of two different kindsof resins on removal of Cu(II) were compared. The breakthroughcapacity of Purolite C-160H was greater than RNH-CH120 with 100mg Cu(II)/L (pH:3.5) stock solution. It was also observed that thediffusion mechanism of RNH-CH120 resin was slower and itsfunctional groups were less than Purolite C-160H resin. The copper onthe resins was quantitatively eluted with 1 M HCl.In the second part of column studies, the effects of concentrationand feed flow rate were investigated for the removal of Cu(II) byRNH-CH120 resin. The column performances were compared withdifferent Cu(II) concentrations (at 10-30-50 mg Cu(II)/L) at the sameflow rate, it was observed that the breakthrough capacity of 50 mgCu(II)/L solution was higher than the others. But the elutionefficiencies were nearly the similar. It was observed that if feed flowrate was decreased breakthrough capacity increased.The used and original RNH-CH120 and Purolite C-160H resinswere analyzed using IR spectrophotometer. It was observed that atnearly 1550 cm-1 some -COO- (carboxylate) groups appeared on RNH-CH120 resin after sorption-elution steps. This result shows thatamidoxime groups hydrolyzed to carboxylate groups in the acidicmedium. In case of Purolite C-160H resin, there was no change aftercolumn use.
Özet (Çeviri)
Heavy metals in industrial wastewaters generate detrimentaleffect on environment, human health and economy. The chelatingresins can be used for extraction of toxic metals in the natural andwaste waters, exhibiting greater selectivity for heavy metals.In this study, the macroporous chelating resins; RCSP(II)containing methylene phosphonic groups (DVB: 10 mol%),Xcommercially available Purolite C-160H containing sulphonic groups(DVB: 10 mol%), RNH-CH120 containing amidoxime groups (DVB:5 mol %) were used for metal removal from aqueous solutions bybatch and column methods. In batch studies performed in thelaboratory, the effect of pH and resin amount on Cu(II) removal fromaqueous solutions were investigated. In column studies, the resinperformances of two different kinds of resins on removal of Cu(II)were compared.Metal ion selectivity of chelating resins was studied bymeasuring pH dependency of distribution ratios of various metal ions(Cu(II), Cd(II), Cr(III)) by these resins using solutions containing10-4 M metal ions. Metal analysis was carried out by atomic absorptionspectrophotometer. The percent removal of Cr(III) and Cu(II) reacheda plateau with about 100% of removal at pH 2 and at pH 3 byRCSP(II) resin respectively. Commercial Purolite C-160H resinshowed a higher selectivity to Cu(II) ions than Cr(III) ions. Thepercent removals reached a plateau with about 80% of removal at pH6, 100% of removal at pH 6, 100% of removal at pH 7 on the RNH-CH120 resin, for Cr(III),Cu(II) and Cd(II) ions, respectively.The optimum resin amounts of Purolite C-160H and RNH-CH120 resins were determined for removal of Cu(II) from 100 mgCu(II)/L (pH:3.5) solution. The obtained results were used for thekinetic studies.Kinetic studies were performed by using Purolite C-160Hand RNH-CH120 resins. The kinetic data were applied on someXImathematical kinetic models and the rate controlling steps were found.In the kinetic studies of both resins, it was found that the reaction ratewas controlled by particle diffusion.In column studies, the resin performances of two different kindsof resins on removal of Cu(II) were compared. The breakthroughcapacity of Purolite C-160H was greater than RNH-CH120 with 100mg Cu(II)/L (pH:3.5) stock solution. It was also observed that thediffusion mechanism of RNH-CH120 resin was slower and itsfunctional groups were less than Purolite C-160H resin. The copper onthe resins was quantitatively eluted with 1 M HCl.In the second part of column studies, the effects of concentrationand feed flow rate were investigated for the removal of Cu(II) byRNH-CH120 resin. The column performances were compared withdifferent Cu(II) concentrations (at 10-30-50 mg Cu(II)/L) at the sameflow rate, it was observed that the breakthrough capacity of 50 mgCu(II)/L solution was higher than the others. But the elutionefficiencies were nearly the similar. It was observed that if feed flowrate was decreased breakthrough capacity increased.The used and original RNH-CH120 and Purolite C-160H resinswere analyzed using IR spectrophotometer. It was observed that atnearly 1550 cm-1 some -COO- (carboxylate) groups appeared on RNH-CH120 resin after sorption-elution steps. This result shows thatamidoxime groups hydrolyzed to carboxylate groups in the acidicmedium. In case of Purolite C-160H resin, there was no change aftercolumn use.
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