## Arsenic Removal by MIPs
### As(III) (Arsenite)  
Regarding the development of MIPs intended specifically for the removal of As(III), several studies can already be found in the literature.  
In the study by [PERSON] et al. [85], a brand-new approach was recommended for the formulation of As(III)-imprinted polymer by utilizing As(C4H5O2)3 as a template [85]. Precipitative polymerization was applied to synthesize a nano-sized As(III)-imprinted polymer. Methacrylic acid (MAA), hydroquinone and ethylene glycol dimethacrylate (EDMA) were used as a functional monomer and cross-linking agent, respectively, with azobisisobutyronitrile (AlBN) as an initiator and acetonitrile as a porogen. The polymerization reaction took place at 60 \({}^{\circ}\)C and lasted for 24 h. It was validated that the arsenic was identified as As(III) by the selective cavities of the synthesized IIP. The FT-IR figure revealed that the arsenic was extracted by the IIP sites in the form of As(III), where it was stabilized via coordination bonding with the carboxylic acid functional groups of the sites [85].  
In another study, ion-imprinted polymer (As(III)-IIP) was manufactured using allythitourea as a functional monomer and As(III) as a template for removing As from water [86]. The synthesis of As(III)-IIP as a sorbent was prepared via bulk polymerization. Ethylene glycol dimethacrylate (EGDMA) and 2, 2\({}^{\prime}\)-azobisisobutyronitrile (AlBN) were used as the cross-linking monomer and the initiator, respectively. The total capacity was 0.0679 mmol/g for 25 mg/L of initial arsenite. At pH 7, a high percentage of removal (90%) was achieved. The novelty of As(III)-IIP is that it is able to recover the arsenite from aqueous media [86].  
Furthermore, an As(III)-imprinted polymer was effectively produced by using 1-vinyl imidazole as a ligand for the removal of arsenic from the natural environment [87]. Methacrylic acid (MAA) was used as the functional monomer, with ethylene glycol dimethacrylate (EGDMA) as the cross-linking monomer, and 2, 2\({}^{\prime}\)-azobisisobutyronitrile (AIBN) as the initiator. Maximum adsorption was achieved at pH 7 and the reusability evaluation showed that As(II)-IIP can be used up to 6 times, with only slight adsorption decay. Similarly, a novel MGO-As(III)-IIP [88] was prepared by using As(III) as a template, with Fe\({}_{3}\)O\({}_{4}\)/GO as a support, methacrylic acid (MAA) as a functional monomer, ethylene glycol dimethylacrylate (EGDMA) as a cross-linker, and azobisisobutyronitrile (AIBN) as an initiator. MGO-As(III)-IIP exhibited an adsorption capacity of 49.42 mg/g at a pH of 6 and great reusability after five cycles of regeneration and reuse when using 0.5 M NaOH solution as the desorption agent.  
Last, but not least, the development of ion-imprinted magnetic nanoparticles for As(III) and As(V) removal from wastewater was recently studied [89], using N-methacryloyl-l-cysteine (MAC) as a monomer with As(III) and As(V) as the template molecules, ethylene glycol dimethylacrylate (EGDMA) as the cross-linker, and 2-hydroxyethyl methacrylate (HEMA) as the initiator. The resulting MAC-As(III)/As(V) complex displayed an efficient adsorption removal capacity of 76.83 mg/g for As(III) and 85.57 mg/g for As(V). Moreover, the IIP nanoparticles showed great removal ability in a wide pH range of 4-8. Ten adsorption-desorption cycles were repeated ten times using 0.01 M HNO\({}_{3}\) for washing, in order to show the reusability and stability of the IIP-As(III) and IIP-As(V). At the end of ten cycles, no significant reduction in removal capacity was observed [89].