Highly efficient removal and preconcentration of lead and cadmium cations from water and wastewater samples using ethylenediamine functionalized SBA-15

Abstract This study investigated the potential use of ethylenediamine functionalized SBA-15 (en-SBA) nanoporous silica compound, in removal and preconcentration of lead and cadmium cations from aqueous solutions. en-SBA was synthesized according to procedure in the literature and the presence of organic groups in the silica framework was demonstrated by FTIR spectrum. The functionalized product showed the BET surface area 250 m2 g− 1 and pore diameter 27 A, based on adsorption–desorption of N2 at 77°K. Flame atomic absorption spectrometry was used to determine the ions concentration in the eluted solution after the adsorption process. The effect of several variables such as (amount of adsorbent, stirring time, pH, metal concentration and presence of other metals in the medium) has been studied. Lead and cadmium ions were completely removed at pH greater than 4.5 after stirring for 15 min. The maximum capacity of the adsorbent was found to be 360.0 ± 1.4 μg and 100.0 ± 0.6 μg of lead and cadmium ions/mg functionalized SBA-15, respectively. The preconcentration factor of the method was found to be 200. The applications of this methodology for real samples were examined by laboratory wastewater samples. For all samples the percentage of removal and recovery was found to be more than 98%.

[1]  Sung‐Jin Kim,et al.  Adsorption of lead from water by thiol-functionalized SBA-15 silicas , 2010 .

[2]  H. P. Sarma,et al.  Removal of lead(II) from aqueous solution using heartwood of Areca catechu powder , 2010 .

[3]  D. Pérez-Quintanilla,et al.  Preparation of 2-mercaptobenzothiazole-derivatized mesoporous silica and removal of Hg(ii) from aqueous solution. , 2006, Journal of environmental monitoring : JEM.

[4]  N. Burham.  Separation and preconcentration system for lead and cadmium determination in natural samples using 2-aminoacetylthiophenol modified polyurethane foam. , 2009 .

[5]  M. Mahmoud,et al.  Removal and preconcentration of lead (II) and other heavy metals from water by alumina adsorbents developed by surface-adsorbed-dithizone , 2010 .

[6]  Thomas O. Main,et al.  Removal , 1881, The Dental register.

[7]  Jun Liu,et al.  Design and Synthesis of Selective Mesoporous Anion Traps. , 1999 .

[8]  D. Brunel,et al.  Monoglyceride Synthesis by Heterogeneous Catalysis Using MCM-41 Type Silicas Functionalized with Amino Groups. , 1997, The Journal of organic chemistry.

[9]  Damián Pérez-Quintanilla,et al.  Preconcentration of Zn(II) in water samples using a new hybrid SBA-15-based material. , 2009, Journal of hazardous materials.

[10]  Alfredo Sánchez,et al.  Solid phase extraction of Pb(II) in water samples using a new hybrid inorganic-organic mesoporous silica prior to its determination by FAAS , 2009 .

[11]  D. Brunel,et al.  Amine functions linked to MCM-41-type silicas as a new class of solid base catalysts for condensation reactions , 1997 .

[12]  Taewook Kang,et al.  Ordered mesoporous silica (SBA-15) derivatized with imidazole-containing functionalities as a selective adsorbent of precious metal ions , 2004 .

[13]  E. Hagaman,et al.  Synthesis and Characterization of Organic−Inorganic Hybrid Mesoporous Anion-Exchange Resins for Perrhenate (ReO4-) Anion Adsorption , 2003 .

[14]  O. F. Webb,et al.  Synthesis and Characterization of Ordered Mesoporous Anion-Exchange Inorganic/Organic Hybrid Resins for Radionuclide Separation , 2000 .

[15]  A. Stein,et al.  Comparative Studies of Grafting and Direct Syntheses of Inorganic−Organic Hybrid Mesoporous Materials , 1999 .

[16]  Bradley F. Chmelka,et al.  Nonionic Triblock and Star Diblock Copolymer and Oligomeric Surfactant Syntheses of Highly Ordered, Hydrothermally Stable, Mesoporous Silica Structures , 1998 .

[17]  G. Mckay,et al.  Selective Adsorbents from Ordered Mesoporous Silica , 2003 .

[18]  M. Mahmoud,et al.  Performance evaluation of hybrid inorganic/organic adsorbents in removal and preconcentration of heavy metals from drinking and industrial waste water. , 2010 .

[19]  E. Eren,et al.  Enrichment and determination of Ni2+ ions in water samples with a diamino-4-(4-nitro-phenylazo)-1H-pyrazole (PDANP) by using FAAS , 2010 .

[20]  John B. Shoven,et al.  I , Edinburgh Medical and Surgical Journal.

[21]  Damián Pérez-Quintanilla,et al.  Adsorption of cadmium(II) from aqueous media onto a mesoporous silica chemically modified with 2-mercaptopyrimidine , 2006 .

[22]  L. Bonneviot,et al.  SURFACE TAILORING CONTROL IN MICELLE TEMPLATED SILICA , 2006 .

[23]  M. Mahmoud,et al.  Removal, preconcentration and determination of trace heavy metal ions in water samples by AAS via chemically modified silica gel N-(1-carboxy-6-hydroxy) benzylidenepropylamine ion exchanger , 2010 .

[24]  M. Ganjali,et al.  Novel Method for the Fast Preconcentration and Monitoring of a ppt Level of Lead and Copper with a Modified Hexagonal Mesoporous Silica Compound and Inductively Coupled Plasma Atomic Emission Spectrometry , 2004, Analytical sciences : the international journal of the Japan Society for Analytical Chemistry.