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

Abstract

β-FeOOH-coupled activated carbon (FAC) was prepared and used to remove bromate from an aqueous phase. SEM, XRD, and FTIR analyses indicated that a larger number of β-FeOOH particles were anchored on the AC surface, which greatly enhanced the bromate adsorption and reduction rates. The influences of the pH, contact time, temperature, and competitive anions on bromate removal by FAC were evaluated. FAC can be used over a wide pH range (3−8) for bromate adsorption and reduction, and competing anions inhibit bromate uptake. The adsorption kinetics agreed well with the pseudo-second-order model (R 2 ≥ 0.99), and the adsorption isotherms were well fitted by the Langmuir model. The thermodynamic analysis suggested that bromate removal by FAC was a spontaneous and endothermic process. Bromate was adsorbed and then reduced to bromide; Fe 3+ acted as a catalyst to accelerate the reductive reaction. The results of this study indicate that FAC is a stable and promising material for bromate removal.

Sustainable Thermochemical Single-Step Process To Obtain Magnetic Activated Carbons from Chestnut Industrial Wastes

“…14,20 In the bioscience and medicine area, an important property of MACs is that these materials can be targeted to a desired place using an external magnetic field. 16 The transformation of an activated carbon into magnetic derivatives is being studied using various methods for its preparation: 16,21 chemical precipitation, 22,23 high-temperature treatment, 18,24 or encapsulation. 25 On the other hand, a MAC can be developed from a biomass through a chemical activation process with a previous pyrolysis step of the precursor 26 or without it.…”

“…MACs have great potential applications in several areas such as environmental science, bioscience, and medicine . In environmental technology, MACs can be used as adsorbents for the removal of traditional and emerging pollutants from liquid effluents. ,− An interesting property of MACs is that these materials, once the adsorbent properties have been exhausted, can be easily separated from complex systems by using an external magnetic field. Furthermore, the MAC regeneration can be performed by advanced oxidation processes (AOPs) using H 2 O 2 and the iron compounds contained within MACs (Fenton reaction).…”

“…MACs have great potential applications in several areas such as environment, bioscience and medicine 16 . In the environmental technology, MACs can be used as adsorbents for the removal of traditional and emerging pollutants from liquid effluents 7, [17][18][19] . An interesting property of MACs is that these materials, once the adsorbent properties have been exhausted, they can be easily separated from complex systems by using an external magnetic field.…”

“…The transformation of an activated carbon into magnetic derivatives is being studied using various methods for its preparation 16, 21 : chemical precipitation [22][23] , high temperature treatment 18,24 ; or encapsulation 25 . On the other hand, a MAC can be developed from a biomass through a chemical activation process with a previous pyrolysis step of the precursor 26 or without it 12, 17 .…”

The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts

“…To enhance the reactivity of the nanoscale catalysts during the direct reduction of bromate, the H 2 induced-catalytic approach using various materials has been studied in batch and continuous reaction systems [ 19 , 25 ]. The H 2 , a reducing agent, needs to be provided for the hydrogenation of BrO 3 − and the reduction of metals.…”