## Arsenic Removal by MIPs  
### As(V) (Arsenate)  
In the paper published by [PERSON] et al. [32], the elimination of As(V) via adsorptive retention from aqueous sources was investigated using 3 adsorbents. The adsorbents were: (a) aluminum nanoparticles (Alu-NPs, <50 nm), incorporated in amine-rich cryogels (Alu-cryo); (b) molecularly imprinted polymers (<38 \(\upmu\)m) in polyacrylamide cryogels (MIP-cryo); and (c) thiol-functionalized cryogels (SH-cryo). These were assessed with regard to the material characteristics and arsenic removal in both batch test and continuous modes [32]. By designing a composite adsorbent combining cryogels with particles (at nano- and micro-scales), an increase in mechanical stability was observed. For the preparation of MIPs, As(V) was used as a template, with acrylamide (AAm) as a functional monomer, N,N\({}^{\prime}\)-methylene bis(a-crylamide) (MBAAm) as a cross-linking monomer, azobisisobutyronitrile (AlBN) as an initiator, methanol as a porogen, and bulk polymerization. The adsorptive removal of arsenic was tested in real wastewater; the adsorption amounts for the composites were 20.3 \(\pm\) 0.8 mg/g for the adsorbent (Alu-cryo) and 7.9 \(\pm\) 0.7 mg/g of adsorbent for (MIP-cryo), respectively. Composites worked well in the studied pH range of pH 2-8, with no significant changes to arsenic adsorption due to the pH change. For the materials used in this study, the Langmuir model fitted well with the obtained adsorption curves, with \(R^{2}\) values > 0.9. In experiments in real wastewaters that were spiked with arsenic(V), it was found that the co-ions (nitrate, sulfate and phosphate) affected arsenic removal less profoundly for MIP-cryogels than other cryogel materials [32], indicating the selectivity of the proposed material, which is its main advantage. Another study synthesized a new arsenic-ion-imprinted polymer (As-IIP) for the removal of As(V) from water [78]. Na\({}_{2}\)HAsO\({}_{4}\cdot\)7H\({}_{2}\)O was used as the template, 1-vinylimidazole (1-Vlm), 4-vinylpyridine (4-Vp), and styrene were the functional monomers, ethylene glycol diacrylate (EDMA) was the cross-linking monomer, with azobisisobutyronitrile (AlBN) as an initiator, acetic acid-methanol as a porogen, and bulk polymerization at 60 \({}^{\circ}\)C overnight. The robust As-IIP sorbent demonstrated good reusability up to 20 cycles. The material was quite efficient over a working pH range of 5-7 [78]. Na\({}_{2}\)HAsO\({}_{4}\cdot\)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\({}^{\prime}\)-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. This innovative magnetic arsenate-imprinted polymer (mMIIP) was synthesized in order to investigate the selective adsorption performance of As(V). 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]. Furthermore, a cysteine derivative-modified TiO\({}_{2}\)-doped ZnS nanoparticle was developed as a monomer (Cys@ZnS: TiO\({}_{2}\) NPs) implemented for the synthesis of a novel, selective, and sensitive As(III) and (V)-imprinted membrane, i.e., a grafting-from-membrane (GFM) novel type [80]. The relative imprinted membrane was synthesized by mixing one of the monomers, acrylamide (AA), with membrane precursors, followed by the addition of a pre-polymer mixture, known as a membrane with a capping agent. The maximum adsorption capacity was found to be 151.0 and 130.0 mg/g for As(III) and (V), respectively, on the As(III)- and As(V)-imprinted GFMs. This comprises one of the case studies showing that the use of MIPs with the appropriate template can create very efficient adsorbents for As(V) and As(III) removal.