Bisphenol A Adsorption from Aqueous Solution Using Graphene Oxide-Alginate Beads

A novel magnetite C18/paracetamol/alginate adsorbent bead for simultaneous extraction of synthetic antioxidants and bisphenol A in water samples

“…Therefore, the mC18/Pa/Alg bead could not easily adsorb the protonated analytes because hydrogen bonding between analytes and bead was reduced. Additionally, excess H + ions in the solution could combine with COO − and compete with the analytes for adsorption on the surface sites of the bead, 17 and extraction recoveries decreased. In the basic condition (pH 9), more OH − was available to disrupt adsorption, and since this pH is close to the p K a of the analytes, neutral analytes could start deprotonating to anions.…”

“…The BET surface area of the mC18/Pa/Alg bead was 153.11 m 2 g −1 , notably higher than other reported alginate beads (2.16-32.20 m 2 g −1 ). 17,27,28 This difference could be due to the synthesis process and precursor applied. The BJH pore volume of 0.29 cm 3 g −1 and average pore diameter of 7.69 nm conrmed that the bead obtained in this work was of the mesoporous class (2 nm < pore size < 50 nm).…”

“… 16 Recently, a magnetic molecularly imprinted polymer (MMIP) was synthesized through the radical polymerization of the monomer with a BPA template that was removed by Soxhlet extraction 6 and a graphene oxide-alginate bead (GO-AB) was synthesized with a centrifugation step for GO. 17 Previously, we prepared magnetic mesoporous carbon by using phloroglucinol and glyoxylic acid as precursors and pluronic F-127 as a surfactant: the composite was used to extract BHA and BHT. 10 However, our method required a temperature of 800 °C under a nitrogen atmosphere and we would prefer to develop a magnetic adsorbent without the complexity, long preparation time and harsh solvent and temperature conditions of our and other methods.…”

“…Sodium alginate (SA) is a naturally occurring biopolymer with abundant carbonyl and hydroxyl groups and oxygen atoms. 17 It has been used to prepare biocompatible and biodegradable materials using easy and cost-effective methods. Furthermore, the extraction of our target analytes can be increased via π–π stacking and hydrogen bonding with the widely used painkiller paracetamol (acetaminophen or 4′-hydroxyacetanilide), 18 which contains aromatic ring and amine group.…”

Water decontamination in terms of Hg(II) over thiol immobilized magnesium ferrite: Gum Arabic biosorbent—response surface optimization, kinetic, isotherm and comparing study

“…In view of the economical aspects and environmental benign; adsorption is more suitable process for water treatment comparing with the mentioned techniques [11,12]. Numerous adsorbents such as carbon based materials, silica gel, chelating resins, and fibers, have been applied in mercury adsorption process [13][14][15][16][17][18]. In spite of worthiness of the most mentioned adsorbents in literature some of them show weaknesses like low capacity and high equilibrium time causes low desire to choose them for water treatment hence it is quite necessary to develop novel adsorption based plane for water treatment [19].…”