High removal performance of a magnetic FPA90-Cl anion resin for bromate and coexisting precursors: kinetics, thermodynamics, and equilibrium studies

Abstract

In this study, the FPA90-Cl resin was magnetized with supported FeO particles using a chemical co-precipitation method and its removal performance of bromate and coexisting precursors was explored. The magnetized FPA90-Cl resin was structurally characterized by SEM, FT-IR, and XRD. The effects of the initial concentrations, temperature, and resin dosage on bromate and bromide ion removal in drinking water were investigated using batch experiments. The magnetized FPA90-Cl resin exhibited a high removal efficiency for bromate and bromide ions at three initial concentrations, and the residual bromate concentrations were under the maximum contaminant level (MCL) of 10 μg L after 80 min. The adsorption data of bromate and bromide ion could be well described by a pseudo-first-order kinetic model (R ˃ 0.98). The bromate removal alone was further studied by varying the initial solution pH, temperature, and competitive anions. The results showed that the magnetized FPA90-Cl resin could be used over a wide pH range (4.0-9.0). The maximum sorption capacity of the magnetized FPA90-Cl resin for bromate reached 132.83 mg g at 298 K. The Freundlich and Redlich-Peterson isotherm models fit the bromate adsorption equilibrium better (R ˃ 0.99) than the Langmuir isotherm model (R ˃ 0.98). The thermodynamic analysis showed that the bromate adsorption process was endothermic. The negative ΔG and positive ΔS indicated that the process was spontaneous and that randomness increased after adsorption, respectively. The competition of coexisting anions with bromate was in the order of SO > CO > Cl > NO > HCO > PO. Additionally, the magnetized FPA90-Cl resin could maintain a high bromate and bromide ion adsorption capacity after five cycles of regeneration by a 0.1 M NaCl solution. Graphical abstract ᅟ.

β-FeOOH-Coupled Activated Carbon Prepared by the High Temperature Impregnation Method for Bromate Removal from Water

“…The results are shown in Table . The Δ G ° values were negative at 30, 40, and 50 °C, which indicates that bromate removal by FAC is a spontaneous and feasible process . The K D values increased as the temperature increased, which suggests that bromate removal by FAC is an endothermic process.…”

“…The ΔG°values were negative at 30, 40, and 50 °C, which indicates that bromate removal by FAC is a spontaneous and feasible process. 36 The K D values increased as the temperature increased, which suggests that bromate removal by FAC is an endothermic process. The ΔH°value was positive (46.37 kJ/mol) and greater than 40 kJ/mol, which further indicates that bromate removal by FAC is an endothermic chemisorption process.…”

Technical and Cost Assessment of Electrocatalytic Bromate Removal from Drinking Water

“…Capital and O&M costs for IX, GAC, and RO were determined using the WBS model, and input parameters are provided in Texts S1–S3. Key assumptions for IX are strong base polystyrenic macroporous resins with empty bed contact time (EBCT) of 12 min, and the constants for the Freundlich isotherm model are from Xu’s work . Langmuir adsorption model fitting parameters for bromate on activated carbon in Yan’s work and an EBCT of 8 min were used as key assumptions for GAC .…”

“…Key assumptions for IX are strong base polystyrenic macroporous resins with empty bed contact time (EBCT) of 12 min, and the constants for the Freundlich isotherm model are from Xu's work. 64 Langmuir adsorption model fitting parameters for bromate on activated carbon in Yan's work and an EBCT of 8 min were used as key assumptions for GAC. 65 A low pressure RO membrane with a rejection rate of 85% is the main assumption for RO.…”

Removal of Carcinogenic Arsenic from Drinking Water By the Application of Ion Exchange Resins

“…The determined optimum amounts of each resin were mixed be attributed to quaternary amine groups of the resins [21][22][23]. O-H asymmetric stretching vibration and Fe-O stretching vibration at 1083 cm -1 to 1095 cm -1 and 532 cm -1 to 561 cm -1 bands respectively reveal at the FTIR analysis of Lewatit FO36…”