TY - JOUR
T1 - Highly selective removal of nitrate and perchlorate by organoclay
AU - Bagherifam, Saeed
AU - Komarneni, Sridhar
AU - Lakzian, Amir
AU - Fotovat, Amir
AU - Khorasani, Reza
AU - Huang, Wenyan
AU - Ma, Jianfeng
AU - Hong, Siqi
AU - Cannon, Fred S.
AU - Wang, Yujue
N1 - Funding Information:
The senior author Saeed Bagherifam gratefully acknowledges the financial support provided by Ferdowsi University of Mashhad and Ministry of Science, Research and Technology of Iran to conduct some parts of his PhD thesis as visiting scholar at Material Research Lab, The Pennsylvania State University, USA. Ms. Huang Wenyan gratefully acknowledges the financial sponsorship of Changzhou University Overseas Research & Training Program through an award. Dr. Ma Jianfeng gratefully acknowledges the financial sponsorship of Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents through an award. This research was supported by the College of Agricultural Sciences under Station Research Project No. PEN04319 .
PY - 2014/6
Y1 - 2014/6
N2 - 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 40.27Å 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 1.11mmolg-1, respectively. Nitrate and perchlorate uptake kinetics were found to be fast as equilibrium was reached within 4h. 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.
AB - 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 40.27Å 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 1.11mmolg-1, respectively. Nitrate and perchlorate uptake kinetics were found to be fast as equilibrium was reached within 4h. 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.
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U2 - 10.1016/j.clay.2014.03.021
DO - 10.1016/j.clay.2014.03.021
M3 - Article
AN - SCOPUS:84902079164
SN - 0169-1317
VL - 95
SP - 126
EP - 132
JO - Applied Clay Science
JF - Applied Clay Science
ER -