Selective Removal of As(V) from Aqueous Solutions Using Magnetic As(V)-Imprinted Polymers with Combination of Two Functional Monomers

Abstract

A novel magnetic arsenate imprinted polymer (MIIP) was synthesized through a surface imprinting technique with combined utilization of two different amine containing functional monomers (allylamine and 3-aminopropyl triethoxysilane) and tetraethyl orthosilicate modified magnetic Fe3O4 nanoparticles as a support. The synthesized MIIP was used to investigate the selective adsorption performance for arsenate. The results showed that this MIIP has a high selective As (V) adsorption efficiency and easy for the separation of the adsorbent from aqueous solutions. In the presence of competing ions including Ca2+, Mg2+, Cd2+, Zn2+, Cu2+, Mn2+, Ni2+ and As (III), the synthesized MIIP can selectively and efficiently adsorb As (V) species. Compared with the non-imprinted magnetic polymer (NIP), it was found that this MIIP showed high selectivity coefficients for As (V)/Ca2+, As (V)/Mg2+, As (V)/Cd2+, As (V)/Zn2+, As (V)/Cu2+, As (V)/Mn2+, As (V)/Ni2+, and As (V)/As (III) with 4.46, 5.60, 5.45,8.48,13.5,15.9,38.7, and 102.9, respectively. Langmuir model was applied to fit the adsorption isotherm data, and the maximum adsorption capacity for As (V) was calculated as 7.53mg/g.

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

“…The material was quite efficient over a working pH range of 5-7 [78]. Na 2 HAsO 4 •7H 2 O was also used as a template in another study [79]. Allylamine hydrochloride and 3-aminopropyl triethoxysilane (APTES) were employed as functional monomers, with N,N -methylene bisacrylamide (MBA) as a cross-linking monomer, potassium persulfate (K 2 S 2 O 8 ) as an initiator, and ethanol and aqueous solution as a porogen and for the surface imprinting technique were used in series.…”

“…Compared with a non-imprinted magnetic polymer (NIP), it was found that this mMIIP showed high selectivity coefficients. The maximum adsorption capacity for As(V) was calculated as 7.13 mg/g [79].…”

“…In an attempt to remove As(V) from potable water, mine effluent, industrial effluent, or other fluids and, generally, in water treatment (in both industrial and residential wastewater treatment) [74], several studies have been conducted, taking advantage of the properties of MIPs and preparing different materials, such as polymer beads [90], resins [63], molecularly imprinted polymer cryogels (MIP-cryo) [32], monoliths [32,78], magnetic arsenate-imprinted polymer (mMIIP) [79], and membranes. Similar to the removal of As(V), there have been fewer studies so far on the removal of As(III), in which the researchers have prepared molecularly imprinted polymer beads and membranes [77].…”

“…Previous research has reported that magnetic arsenate molecularly imprinted polymer (mMIIP) can be used for the selective adsorption of As(V) [79]. For this reason, the surface imprinting technique was applied (stirred and refluxed for 16 h at 70 • C), using two different amine-containing functional monomers (allylamine hydrochloride and APTES), with MBA as the cross-linking monomer, K 2 S 2 O 8 as the initiator, ethanol-aqueous solution as the porogen, and tetraethyl orthosilicate-modified magnetic Fe 3 O 4 nanoparticles as a support.…”