Montmorillonite-supported nanoscale zero-valent iron for removal of arsenic from aqueous solution: Kinetics and mechanism

Abstract Montmorillonite-supported nanoscale zero-valent iron (Mt-nZVI) has been synthesized to remove inorganic arsenic (As) from aqueous solutions. BET, SEM, EDX, XRD and XPS were used to characterize the clay-supported material which consists mainly of core shell Fe(0) structure with an outer oxide/hydroxide shell. The dispersion of nZVI onto montmorillonite was found to be increased with decreasing tendency to agglomerate into larger particles. Batch experiments revealed that adsorption kinetics followed pseudo-second order rate equation with high affinity towards both As(III) and As(V) over a wide pH range (4–8) which was decreased at pH > 9. The maximum adsorption capacity calculated from the Langmuir adsorption isotherm was found to be 59.9 and 45.5 mg g−1 for As(III) and As(V) respectively at pH 7.0. Although the presence of competing anions like SO 4 2 - , HCO 3 - and NO 3 - did not show pronounced effect, PO 4 3 - had an inhibitory action on the adsorption. The XPS analyses of As-reacted Mt-nZVI indicated the occurrence of surface catalyzed oxidation of As(III) to As(V). The possible regeneration using 0.1 M NaOH and performance of Mt-nZVI was investigated by repeating adsorption-elution process. This study has great significance for demonstrating Mt-nZVI as potential adsorbent to reduce elevated levels of As in groundwater.

[1]  M. Conklin,et al.  Electrochemical and spectroscopic study of arsenate removal from water using zero-valent iron media. , 2001, Environmental science & technology.

[2]  Charles F. Harvey,et al.  Arsenic Mobility and Groundwater Extraction in Bangladesh , 2002, Science.

[3]  M. L. Hunt,et al.  Arsenic(III) and arsenic(V) reactions with zerovalent iron corrosion products. , 2002, Environmental science & technology.

[4]  Prosun Bhattacharya,et al.  Arsenic in soil and groundwater: an overview , 2007 .

[5]  G. Dobbs,et al.  Inorganic Arsenic Removal by Zero-Valent Iron , 2000 .

[6]  Haitao Huang,et al.  Preparation of silver nanoparticles in inorganic clay suspensions , 2008 .

[7]  T. Mallouk,et al.  Remediation of Cr(VI) and Pb(II) aqueous solutions using supported, nanoscale zero-valent iron , 2000 .

[8]  T. Scott,et al.  Synthesis and characterization of kaolinite-supported zero-valent iron nanoparticles and their application for the removal of aqueous Cu2+ and Co2+ ions , 2009 .

[9]  Xing Wu,et al.  Removal of arsenic from water by supported nano zero-valent iron on activated carbon. , 2009, Journal of hazardous materials.

[10]  D. Mohan,et al.  Arsenic removal from water/wastewater using adsorbents--A critical review. , 2007, Journal of hazardous materials.

[11]  A. Figoli,et al.  Remediation of inorganic arsenic in groundwater for safe water supply: a critical assessment of technological solutions. , 2013, Chemosphere.

[12]  M. Conklin,et al.  Understanding soluble arsenate removal kinetics by zerovalent iron media. , 2002, Environmental science & technology.

[13]  Feng-Chin Wu,et al.  Initial behavior of intraparticle diffusion model used in the description of adsorption kinetics , 2009 .

[14]  I. Katsoyiannis,et al.  pH dependence of Fenton reagent generation and As(III) oxidation and removal by corrosion of zero valent iron in aerated water. , 2008, Environmental science & technology.

[15]  O. Leupin,et al.  Oxidation and removal of arsenic (III) from aerated groundwater by filtration through sand and zero-valent iron. , 2005, Water research.

[16]  Prosun Bhattacharya,et al.  Arsenic mobilization in the aquifers of three physiographic settings of West Bengal, India: understanding geogenic and anthropogenic influences. , 2013, Journal of hazardous materials.

[17]  J. W. Lee,et al.  Enhanced Cr(vi) removal using iron nanoparticle decorated graphene. , 2011, Nanoscale.

[18]  C. Noubactep.  A CRITICAL REVIEW ON THE PROCESS OF CONTAMINANT REMOVAL IN FE0–H2O SYSTEMS , 2008, Environmental technology.

[19]  N. Grisdanurak,et al.  Background species effect on aqueous arsenic removal by nano zero-valent iron using fractional factorial design. , 2012, Journal of hazardous materials.

[20]  V. Chandra,et al.  Highly selective adsorption of Hg2+ by a polypyrrole-reduced graphene oxide composite. , 2011, Chemical communications.

[21]  O. Leupin,et al.  Iron-catalyzed oxidation of arsenic(III) by oxygen and by hydrogen peroxide: pH-dependent formation of oxidants in the Fenton reaction. , 2003, Environmental science & technology.

[22]  H. Seema,et al.  Environmental applications using graphene composites: water remediation and gas adsorption. , 2013, Nanoscale.

[23]  Li-na Shi,et al.  Removal of chromium (VI) from wastewater using bentonite-supported nanoscale zero-valent iron. , 2011, Water research.

[24]  M. Litter,et al.  Arsenic (V) removal with nanoparticulate zerovalent iron: Effect of UV light and humic acids , 2009 .

[25]  L. Charlet,et al.  Retardation of arsenic transport by oxidized Holocene aquifer sediments of West Bengal, India , 2014 .

[26]  R. Puls,et al.  Arsenate and arsenite removal by zerovalent iron: effects of phosphate, silicate, carbonate, borate, sulfate, chromate, molybdate, and nitrate, relative to chloride. , 2001, Environmental science & technology.

[27]  John F. Stolz,et al.  The Ecology of Arsenic , 2003, Science.

[28]  Thomas E. Mallouk,et al.  Delivery Vehicles for Zerovalent Metal Nanoparticles in Soil and Groundwater , 2004 .

[29]  Prosun Bhattacharya,et al.  Human Health Effects From Chronic Arsenic Poisoning–A Review , 2006, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[30]  C. Rao,et al.  Nanoparticles of nickel and silver produced by the polyol reduction of the metal salts intercalated in montmorillonite , 1996 .

[31]  M. A. Malana,et al.  Adsorption studies of arsenic on nano aluminium doped manganese copper ferrite polymer (MA, VA, AA) composite: Kinetics and mechanism , 2011 .

[32]  Heechul Choi,et al.  Removal of arsenic(III) from groundwater by nanoscale zero-valent iron. , 2005, Environmental science & technology.

[33]  Hong Wang,et al.  Characterization of zero-valent iron nanoparticles. , 2006, Advances in colloid and interface science.

[34]  Daniel W. Elliott,et al.  Zero-Valent Iron Nanoparticles for Abatement of Environmental Pollutants: Materials and Engineering Aspects , 2006 .

[35]  Hanzhong Jia,et al.  Comparative studies on montmorillonite-supported zero-valent iron nanoparticles produced by different methods: reactivity and stability , 2013, Environmental technology.

[36]  Xiao-qin Li,et al.  Determination of the oxide layer thickness in core-shell zerovalent iron nanoparticles. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[37]  Nic E. Korte,et al.  A review of arsenic (III) in groundwater , 1991 .

[38]  J. J. Morgan,et al.  Aquatic Chemistry: Chemical Equilibria and Rates in Natural Waters , 1970 .

[39]  Young Chun,et al.  Water-dispersible magnetite-reduced graphene oxide composites for arsenic removal. , 2010, ACS nano.

[40]  Xin Zhang,et al.  Removal of Pb(II) from water using synthesized kaolin supported nanoscale zero-valent iron , 2010 .

[41]  Bruce E. Koel,et al.  Simultaneous Oxidation and Reduction of Arsenic by Zero-Valent Iron Nanoparticles: Understanding the Significance of the Core−Shell Structure , 2009 .

[42]  Heechul Choi,et al.  Arsenic(V) removal from groundwater using nano scale zero-valent iron as a colloidal reactive barrier material. , 2006, Environmental science & technology.

[43]  Xiao-qin Li,et al.  Sequestration of Metal Cations with Zerovalent Iron NanoparticlesA Study with High Resolution X-ray Photoelectron Spectroscopy (HR-XPS) , 2007 .

[44]  J. Greenleaf,et al.  Polymer supported inorganic nanoparticles: characterization and environmental applications , 2003 .

[45]  P. Westerhoff,et al.  Effect of synthesis conditions on nano-iron (hydr)oxide impregnated granulated activated carbon , 2009 .

[46]  Thiruvenkatachari Viraraghavan,et al.  Arsenic Removal from Drinking Water using Iron Oxide-Coated Sand , 2003 .

[47]  Mark D Johnson,et al.  Chemical reactions between arsenic and zero-valent iron in water. , 2005, Water research.