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Highly selective removal of nitrate and perchlorate by organoclay

نویسنده:
سعید باقری فام
,
Sridhar komarneni
,
امیر لکزیان
,
امیر فتوت
,
رضا خراسانی
,
Wenyan Huang
,
Jianfeng Ma
,
Siqi Hon
,
Fred S. Cannon
,
Yujue Wang
,
Saeed Bagherifam
,
Amir Lakzian
,
Amir Fotovat
,
Reza Khorassani
سال
: 2014
چکیده: An organoclay was prepared using montmorillonite and hexadecylpyridinium chloride (HDPyCl) and tested for the removal of nitrate and perchlorate anions from aqueous solutions. The cationic surfactant modified organoclay was prepared at room temperature using HDPyCl corresponding to 4 times the cation exchange capacity (CEC) of Na-montmorillonite. Powder X-ray diffraction (XRD) analysis of the above organoclay showed a large basal spacing of 40.27 Å with the intercalation of HDPy cations in the interlayers probably as a result of a paraffin-type bilayer arrangement. The adsorption data of nitrate and perchlorate were fitted to the Langmuir and Freundlich adsorption isotherms and pseudo-first order and pseudo-second order kinetic models to better understand their adsorption mechanisms. The nitrate and perchlorate uptakes by this organoclay could be described well using the Langmuir isotherm while their uptake kinetics fitted well to the pseudo-second order model. The maximum adsorption capacities of nitrate and perchlorate by the organoclay, HDPy-montmorillonite were calculated at 0.67 and 1.11 mmol g− 1, respectively. Nitrate and perchlorate uptake kinetics were found to be fast as equilibrium was reached within 4 h. Furthermore, the uptakes of nitrate and perchlorate by HDPy-montmorillonite were found to be highly selective in the presence of Cl−, SO42 − and CO32 −, the most abundant naturally occurring anions. Therefore, the HDPy-montmorillonite could be used as a highly efficient adsorbent for the separation of nitrate and perchlorate from drinking or waste water and ground water.
یو آر آی: http://libsearch.um.ac.ir:80/fum/handle/fum/3349925
کلیدواژه(گان): Nitrate,Perchlorate,Organoclay,Hexadecylpyridinium cations,Adsorption isotherms,Adsorption kinetics
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    Highly selective removal of nitrate and perchlorate by organoclay

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contributor authorسعید باقری فامen
contributor authorSridhar komarnenien
contributor authorامیر لکزیانen
contributor authorامیر فتوتen
contributor authorرضا خراسانیen
contributor authorWenyan Huangen
contributor authorJianfeng Maen
contributor authorSiqi Honen
contributor authorFred S. Cannonen
contributor authorYujue Wangen
contributor authorSaeed Bagherifamfa
contributor authorAmir Lakzianfa
contributor authorAmir Fotovatfa
contributor authorReza Khorassanifa
date accessioned2020-06-06T13:18:56Z
date available2020-06-06T13:18:56Z
date issued2014
identifier urihttp://libsearch.um.ac.ir:80/fum/handle/fum/3349925
description abstractAn organoclay was prepared using montmorillonite and hexadecylpyridinium chloride (HDPyCl) and tested for the removal of nitrate and perchlorate anions from aqueous solutions. The cationic surfactant modified organoclay was prepared at room temperature using HDPyCl corresponding to 4 times the cation exchange capacity (CEC) of Na-montmorillonite. Powder X-ray diffraction (XRD) analysis of the above organoclay showed a large basal spacing of 40.27 Å with the intercalation of HDPy cations in the interlayers probably as a result of a paraffin-type bilayer arrangement. The adsorption data of nitrate and perchlorate were fitted to the Langmuir and Freundlich adsorption isotherms and pseudo-first order and pseudo-second order kinetic models to better understand their adsorption mechanisms. The nitrate and perchlorate uptakes by this organoclay could be described well using the Langmuir isotherm while their uptake kinetics fitted well to the pseudo-second order model. The maximum adsorption capacities of nitrate and perchlorate by the organoclay, HDPy-montmorillonite were calculated at 0.67 and 1.11 mmol g− 1, respectively. Nitrate and perchlorate uptake kinetics were found to be fast as equilibrium was reached within 4 h. Furthermore, the uptakes of nitrate and perchlorate by HDPy-montmorillonite were found to be highly selective in the presence of Cl−, SO42 − and CO32 −, the most abundant naturally occurring anions. Therefore, the HDPy-montmorillonite could be used as a highly efficient adsorbent for the separation of nitrate and perchlorate from drinking or waste water and ground water.en
languageEnglish
titleHighly selective removal of nitrate and perchlorate by organoclayen
typeJournal Paper
contenttypeExternal Fulltext
subject keywordsNitrateen
subject keywordsPerchlorateen
subject keywordsOrganoclayen
subject keywordsHexadecylpyridinium cationsen
subject keywordsAdsorption isothermsen
subject keywordsAdsorption kineticsen
journal titleApplied Clay Sciencefa
pages126-132
journal volume95
journal issue6
identifier linkhttps://profdoc.um.ac.ir/paper-abstract-1041875.html
identifier articleid1041875
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