Excellent Regeneration Property Research Articles

Comparative Study of the Selective Sorption of Organic Dyes on Inorganic Materials—A Cost-Effective Method for Waste Treatment in Educational and Small Research Laboratories

Educational and research laboratories often produce relatively small amounts of highly diverse organic wastes. Treating waste can contribute significantly to the cost of running laboratories. This study introduced a simple and economical waste management system such that readily available used chromatography-grade inorganic materials, such as silica and alumina (basic and acidic), are utilized to treat remnant dye solutions and solution wastes from educational and small research laboratories. To recycle the adsorbents, they were heated to 600 °C, where the adsorbates were combusted. The results showed that acidic alumina is an effective adsorbent material for azo dyes and anionic dyes/stains, as well as textile dyes, with a 98 to 100% removal efficiency. Furthermore, alumina and silica possess excellent regeneration properties, where the dye removal efficiency of the materials was retained after regeneration at 600 °C. The adsorption properties of the materials were compared with those of aliginite and activated biomass from coffee grounds. Kinetic and thermodynamic studies of the sorption processes on the different materials were carried out. Overall, the inorganic materials used were efficient at removing contaminating remnant organic dyes stemming from educational and small research laboratories.

Preparation of mesoporous activated carbon from novel African walnut shells (AWS) for deltamethrin removal: kinetics and equilibrium studies

Novel African walnut shell (AWS) was treated and improved as an agricultural waste by-product to produce high surface area activated carbon via chemical activation with potassium hydroxide (KOH) to achieve extremely effective adsorptive characteristics for deltamethrin removal. The adsorbent (KOHAWS) was characterized by scanning electron microscopy, Fourier transform infrared (FT-IR) spectroscopy, the Brunauer–Emmett–Teller surface area, and pH point of zero charge (PHPZC). Batch sorption experiments were investigated to study the effect of pH, initial concentration and contact time, sorbent dosage, and agitation speed. The results reveal that the experimental data fitted well with Langmuir isotherm model (R2 = 0.997) with maximum adsorption capacity at 57.64 mg g−1 and the kinetics of the sorption follows the pseudo-first-order model (R2 = 0.995). The sorption of deltamethrin onto KOHAWS reveals a high removal efficiency of 98.2%. The findings show that the novel AWS has excellent regeneration and reusability properties and may be used to remove pesticides from aqueous solutions instead of conventional activated carbon.

N-doped activated carbon for high-efficiency ofloxacin adsorption

Preparation of high specific surface area activated carbon from rice husk for the removal of ofloxacin from medical wastewater. The optimum conditions for the preparation of activated carbon were a nitrogen doping ratio of 1:1:4 and an activation temperature of 800 °C (AC). The samples were characterised by N 2 adsorption isotherms, BET, FT-IR, TGA, XPS and SEM. The data showed that the specific surface area of AC was up to 1818.20 m 2 g −1 with a total pore volume of 1.12 cm 3 g −1 . AC formed N-containing functional groups on the surface and had good thermal stability. Scientific batch experiment studies were conducted to investigate the effect of pH, initial concentration, temperature and coexisting ions on the ofloxacin adsorption. The q e reached a maximum value of 780 ± 20 mg g −1 and maintained a removal efficiency of 51.1% after four regeneration cycles. The adsorption equilibrium data and the adsorption process were well represented by Langmuir model and general-order kinetic model, respectively. Thermodynamic studies of adsorption had shown that the adsorption process was autogenous and endothermic. Possible adsorption mechanisms for this material were also analysed. Finally, treatment of synthetic medical wastewater with AC resulted in a high removal rate of 98.3%. The superior adsorption properties combined with ease of preparation, ease of separation and excellent regeneration properties, make this material potentially effective for the removal ofloxacin from real medical wastewater. • Optimal preparation conditions for N-doped AC were studied. • The maximum sorption capacity of AC was 780 mg g −1 . • Various mechanisms for efficient adsorption of N-doped AC were analyzed. • Removal of ofloxacin from synthetic medical wastewater.

Synthesis of mussel-inspired silica nanocomposites for efficient removal of methyl orange

Herein, novel SiO2 nanocomposites have been successfully synthesized using inexpensive catechol (CCh) and polyethyleneimine (PEI) functional modification KH550-SiO2 (CP@SiO2-NH2) via mussel-inspired co-deposition. The FTIR, XRD, BET, TEM, and EDS were used to characterize the CP@SiO2-NH2. The application in Methyl Orange (MO) removal was discussed in detail. The results show that the theoretical maximum adsorption capacity of CP@SiO2-NH2 was 221.73 mg g−1. The adsorption process followed the pseudo-second-order kinetic and Langmuir isotherm model, respectively. Moreover, the CP@SiO2-NH2 exhibited excellent regeneration properties. It shows that the CP@SiO2-NH2 has potential applications for MO removal.

Direct Synthesis of Sulfur-Decorating PAMAM Dendrimer/Mesoporous Silica for Enhanced Hg(II) and Cd(II) Adsorption

Water security caused by heavy metals poses a deleterious hazard to public health and the ecological system. The construction of adsorbents by polyamidoamine (PAMAM) dendrimers for efficient removal of metal ions has attracted considerable interest. However, the general method for the fabrication of these adsorbents was achieved by the surface chemical modification of the substrates with PAMAM dendrimer, which usually causes the defects of low density and uneven distribution of the dendrimer, the blocking of pores, and reducing the adsorption performance. Hence, the development of a new method for preparation of PAMAM dendrimer-based adsorbent to realize the efficient and enhanced adsorption of metal ions is still a challenge. Herein, methylisothiocyanate decorated PAMAM dendrimer/mesoporous silica composites (G0-S-1/x, G1.0-S-1/x, G2.0-S-1/x, x = 2, 4, 6, 8, 10) were synthesized by the direct sol-gel reaction of alkoxysilyl-containing functional PAMAM dendrimer. The adsorbents display enhanced adsorption property for Hg(II) and Cd(II) as compared with the same adsorbents which were prepared by traditional chemical modification method. Take G2.0-S-1/2 as an example, the maximum adsorption capacities are 2.41 and 0.87 mmol·g-1 for Hg(II) and Cd(II), respectively . Moreover, the adsorbents show excellent selective adsorption and regeneration property. G2.0-S-1/2 displays distinct selectivity for Hg(II) with the presence of Co(II), Pb(II), Cd(II), and Cu(II). The regeneration percentage still maintains 95.2% after five adsorption-desorption cycles. The adsorption mechanism is also certified by the experimental method and theoretical calculation.

Construction of PES membranes using NH2-MIL-125 and Pluronic F127 via RTIPS method toward elevated ultrafiltration, antifouling and self-cleaning performance

In this work, the NH2-MIL-125/F127/PES membranes with superior ultrafiltration, anti-fouling and self-cleaning were constructed via the RTIPS method. Characterizations showed the successful fabrication of NH2-MIL-125 with good photocatalysis activities, together with its stable anchoring in PES membrane. The loss of NH2-MIL-125 was suppressed by hydrogen bond between F127 and NH2-MIL-125, where hydrophilic F127 significantly boosted permeability and anti-fouling property. The permeability-selectivity trade-off effect was alleviated by NH2-MIL-125 with a regular size window. It was observed that the membranes prepared by the RTIPS method occurred a spongy-like cross-section and a porous surface, which imparted the membrane with improved ultrafiltration and mechanical properties over the finger-like cross-section and dense skin caused by the NIPS method. The optimal membranes exhibited decent permeability (1511 L/m2 h), BSA rejection rate (85.3%) and high COD removal rate over the commercial membranes, whose flux recovery rate was up to 76.91% after two cycles under light irradiation by the synergistic effect of F127 and NH2-MIL-125. The membrane fouled with RhB exhibited excellent regeneration properties benefiting from the holes (h+) and superoxide free radicals (•O2−), as well as reactive •OH. Overall, the membrane with F127 and NH2-MIL-125 presented a highly promising in improving ultrafiltration and self-cleaning via the RTIPS method.

Simultaneous extraction of multi-antibiotic residues in environmental water by DTPA-modified polyaniline nanofibers membrane

In this study, novel diethylenetriaminepentaacetic acidmodified polyaniline nanofibers membrane (DTPA-PANI NFsM) was designed and fabricated. By the synergistic effect of PANI and DTPA, the DTPA-PANI NFsM demonstrated superior sorption performance towards three classes of antibiotics with very different properties: phenicols, tetracyclines and sulfonamides. The mass transfer efficiency of DTPA-PANI NFsM was particularly high. From the isotherm and thermodynamic studies, favorable and spontaneous adsorption processes were confirmed. The potential adsorption mechanisms were investigated by FT-IR analysis. Under the optimized conditions, an efficient, fast, sensitive and economical method for the high-throughput detection of antibiotic residues in environmental water was developed. Low detection limits (1.6–28.6 ng/L for phenicols, 10–34.3 ng/L for tetracyclines, 0.46–15 ng/L for sulfonamides), broad linear range (1.5 ng/L-5 µg/L) as well as satisfactory recoveries and precisions were obtained. In addition, DTPA-PANI NFsM exhibited excellent regeneration and reusability properties, which could be reused for at least 12 times. Also, the practical application feasibility of the method was confirmed by the test of actual samples.

Smart Solar-Metal-Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage.

Herein, a BiOCl hydrogel film electrode featuring excellent photocorrosion and regeneration properties acts as the anode to construct a novel type of smart solar-metal-air batteries (SMABs), which combines the characteristics of solar cells (direct photovoltaic conversion) and metal-air batteries (electric energy storage and release interacting with atmosphere). The cyclic photocorrosion processes between BiOCl (Bi3+ ) and Bi can simply be achieved by solar light illumination and standing in the dark. Upon illumination, the device takes open-circuit configuration to charge itself from the sunlight. Notably, in this system, the converted solar energy can be stored in the SMABs without the need of external assistance. In the discharging process in the dark, Bi0 spontaneously turns back to Bi3+ producing electrons to induce the oxygen reduction reaction. With an illumination of 15 min, the battery with an electrode area of 1 cm2 can be continuously discharged for ≈3000 s. Taking elemental Bi as the calculation object, the theoretical capacity of the SMABs is 384.75mAh g-1 , showing its potential application in energy storage. This novel type of SMABs is developed based on the unique photocorrosive and self-oxidation reaction of BiOCl to achieve photochemical energy generation and storage.

Magnetic cross-linked chitosan for efficient removing anionic and cationic dyes from aqueous solution

Herein, a novel magnetic cross-linked chitosan CS-BA@Fe3O4 was rationally synthesized by cross-linked with epichlorohydrin and coated with Fe3O4 to the acylated chitosan, which was prepared by the reaction of chitosan with benzenetricarboxylic anhydride. The as-obtained absorbent was characterized by FTIR, XRD, VSM, TGA, TEM, BET, SEM and EDS. The results showed that the maximum adsorption capacities of CR and CV were 471.46 ± 16.97 mg/g and 515.91 ± 25.12 mg/g at 318.15 K, respectively. The main adsorption mechanisms were H-bonding and electrostatic interaction. The kinetic data were in good agreement with the pseudo-second-order model and closed to adsorption equilibrium at 30 min. Thermodynamic studies showed that the adsorption on CS-BA@Fe3O4 were spontaneous and endothermic. More importantly, the adsorbent exhibited excellent regeneration properties after 6 cycles and remarkable stability under harsh environments including strong acid, strong alkali, multi-salt and mixed dyes conditions. Therefore, abundant efforts revealed a broad application prospect of CS-BA@Fe3O4 in water remediation.

In-situ catalytic upgrading of bio-oil from rapid pyrolysis of biomass over hollow HZSM-5 with mesoporous shell

To solve the issue of narrow micropores in traditional protonic type Zeolite Socony Mobil-5 (HZSM-5) catalysts in the restricting of large-molecular reactants/products diffusion, hollow HZSM-5 with a mesoporous shell was prepared using a hydrothermal method combined with a tetrapropylammonium hydroxide (TPAOH) treatment process. Applying for in-situ catalyst upgrading of bio-oil from rapid pyrolysis of biomass, the obtained most efficient catalyst of Hollow(30)-TP resulted in aromatic hydrocarbon yields in the range of 78.49–78.67% for cellulose and hemicellulose, which is much greater than those using the traditional HZSM-5 (61.06–68.26%). Furthermore, in the case using real biomass (cedar) with an optimal biomass/catalyst weight ratio of 1:2, the aromatic hydrocarbon yield reached up to 80.16%. In addition, this catalyst exhibited excellent reusability and regeneration property due to the increased accessibility to the acid sites in the hollow HZSM-5 for the improving of the reaction rate as well as the reducing of coking.

Synthesis and characterization of a thermosensitive solid amine biomass adsorbent for carbon dioxide adsorption

A thermosensitive solid amine fiber SF-AM-co-NIPAM-HBP-NH2 was synthesized by grafting temperature-sensitive monomer N-isopropyl acrylamide (NIPAM) as well as acrylamide (AM) onto the surface of substrate sisal fiber, and further aminating with hyperbranched amine. FTIR, 13C NMR, SEM, EA and TGA were used to confirm the structure and chemical properties of the grafted fibers. Swelling ratio and CO2 adsorption-desorption experiment were investigated to verify the thermo-sensitivity of the grafted fibers and their CO2 adsorption-desorption behavior. Compared with conventional solid amine adsorbents regenerated around 140 °C, SF-AM-co-NIPAM-HBP-NH2 (1:1) with NIPAM could be regenerated at a much lower temperature of 60 °C, while still maintain a high CO2 adsorption capacity (2.61 mmol/g), comparable to that of SF-AM-HBP-NH2 (2.73 mmol/g) before NIPAM introduction. Its excellent regeneration property and the effect of energy consumption reduction make it possible to be used for CO2 adsorption in industrial process.

Fabrication of three-component hydrogen-bonded covalent-organic polymers for ciprofloxacin decontamination from water: adsorption mechanism and modeling

A three-component hydrogen-bonded covalent organic polymer, namely JLUE-HCOP-66, was fabricated via a facile multiple-linking-site solvothermal approach to overcome the weakness of poor function complexity and limited structure diversity of the pure covalent skeletons. The as-prepared JLUE-HCOP-66 polymers were employed to decontaminate ciprofloxacin (CIP), a popular F-quinolones (FQNs) antibiotic, from water and exhibited satisfactory adsorption performance. Specifically, JLUE-HCOP-66 polymers have high adsorption capacity with the maximum contribution of 111.1 mg/g according to the Langmuir model, good antiinterference to NaCl salts, and excellent regeneration property. The pH-dependent experiment results signified the probably dominated mechanism of electrostatic interaction. In addition, adsorption studies and structural characterization in combination illustrated that the pore-filling effect, hydrogen bonding formation might also govern the whole process, accompanied by electrostatic interaction, dipole-dipole complexation, π-π EDA interaction, and hydrophobic-hydrophobic interaction besides. Moreover, electrostatic potentials, as well as the frontier molecular orbital distributions (HOMO and LUMO) of CIP and JLUE-HCOP-66 fragment, were calculated using density functional theory to theoretically support the research. Furthermore, the response surface methodology (RSM) according to the CCD matrix was used to not only study the interactive and cooperative effects of initial CIP concentration, initial pH, ionic strength along with JLUE-HCOP-66 dosage on CIP removal using JLUE-HCOP-66 but also optimize the operation conditions. Given the peculiar structure and functional feature, this work could hopefully bring HCOPs into the practical applications of such challenging and persistent ciprofloxacin potent removal with further large-scale efficiency.

In-situ catalytic upgrading of bio-oil derived from fast pyrolysis of sunflower stalk to aromatic hydrocarbons over bifunctional Cu-loaded HZSM-5

Commercial HZSM-5 zeolite (Si/Al = 24) was modified with Cu species using the wet impregnation method, and applied in the in-situ upgrading of bio-oil from the fast sunflower stalk pyrolysis with a catalyst to biomass ratio of 1:1 at 500 °C. The main objective was to study the Cu doping effect on the HZSM-5 catalytic performance in terms of the selectivity to aromatic hydrocarbons (especially the specific aromatic hydrocarbons including benzene, toluene and xylene) yield. It was found that Cu/HZSM-5 with low Cu loading amounts preserved HZSM-5 crystalline structure as well as its acid sites. The HZSM-5 with 0.5 wt.% Cu loading amount exhibited the best catalytic performance with a high relative amount of aromatic hydrocarbons of 73.2 % and a yield of specific aromatic hydrocarbons as high as 56.5 mg/g-biomass (d.a.f), which were much higher than those based on the parent HZSM-5 (55.0 % and 26.0 mg/g-biomass (d.a.f)). It should be mainly attributed to its suitable acidity and best textural properties for the deoxygenation of the bio-oil thanks to the optimum Cu loading amount. In addition, the 0.5 wt.% Cu loaded HZSM-5 catalyst also showed excellent catalytic reusability and regeneration property, and the spent catalyst was easily recovered by a simple calcination in air for a short time.

A two-dimensional photonic crystal hydrogel biosensor for colorimetric detection of penicillin G and penicillinase inhibitors.

A simple penicillinase functionalized two-dimensional photonic crystal hydrogel (2DPPCH) biosensor was developed for colorimetric detection of penicillin G and penicillinase inhibitors. The penicillinase can specifically recognize penicillin G and catalyze it to produce penicilloic acid, which decreases the pH of the hydrogel microenvironment and shrinks the pH-sensitive hydrogel. The particle spacing decrease of the 2D photonic crystal array induced by the hydrogel shrinkage further causes a blue-shift in the diffraction wavelength. While the hydrolysis reaction is repressed upon treatment with clavulanate potassium (a kind of penicillinase inhibitor), no significant change in the diffraction wavelength is found. The detection of targets can be achieved by measuring the Debye diffraction ring diameter or observing the structural color change in the visible region. The lowest detectable concentrations for penicillin G and clavulanate potassium are 1 μM and 0.1 μM, respectively. Moreover, the 2DPPCH is proved to exhibit high selectivity and an excellent regeneration property, and it shows satisfactory performance for penicillin G analysis in real water samples.

Synergistic preparation of modified alginate aerogel with melamine/chitosan for efficiently selective adsorption of lead ions

Superior mechanical properties, high adsorption capacity, and excellent regeneration property are crucial design criterions to develop a new-type aerogel for adsorptive applications towards heavy metal removal from water. Herein, chitosan and melamine not only introduced abundant functional groups to increase adsorbing sites for lead ions, but also reinforced the three-dimensional network skeleton structure of absorbents to improve the service life in adsorption applications. As-fabricated alginate/melamine/chitosan aerogel can extract Pb (II) from aqueous solution efficiently, i.e., the optimum adsorption quantity of 1331.6 mg/g at pH 5.5, which exhibited excellent and selective adsorption capacity for Pb (II) against the competition of coexisting divalent metal ions. More importantly, alginate/melamine/chitosan aerogel could be regenerated using dilute acidic solution and recovered well after eight adsorption-desorption cycles. This work might offer a new idea for design and preparation of biomass-based aerogel sorbents with promising prospect in the remediation of Pb (II)-contaminated wastewater.

Magnetic graphene-based nanocomposites as highly efficient absorbents for Cr(VI) removal from wastewater.

Due to the merits of their high adsorption and convenient separation, magnetic graphene-based composites have become a promising adsorbent in terms of wastewater treatment. However, recycling and regeneration properties of magnetic graphene-based composites are still a conundrum, which remains to be resolved. Here, Fe3O4/reduced graphene oxide (RGO) (Fe3O4/RGO) nanocomposites were synthesized by one-step solvent-thermal reduction route and used as adsorbents for water purification. It was encouraging to find that the nanocomposites possessed many intriguing properties in removing of Cr(VI) ions, including high adsorption efficiency and excellent recycling and regeneration property. The results indicated that the magnetic separation process of the Fe3O4/RGO nanocomposites only took less than 5s and the maximum removal efficiency of Cr(VI) reached 99.9% under the optimum experimental conditions. Most significantly, the adsorption rate of Cr(VI) can still be as high as 98.13% after 10cycles and the single recycle quality of the nanocomposites can maintain at more than 80%. As a result, the Fe3O4/RGO nanocomposites could be a potential adsorbent for removing heavy metal ions effectively, especially in environmental protection and restoration.

Selective capture of Hg(II) and Ag(I) from water by sulfur-functionalized polyamidoamine dendrimer/magnetic Fe3O4 hybrid materials

Heavy metal ions pollution in water system has been imposing serious damage to aquatic ecosystem and public health. Efficient and selective capture of targeted metal ion from water is a great challenge and the focus of extensive research. Herein, sulfur-functionalized polyamidoamine (PAMAM) dendrimer/magnetic Fe3O4 hybrid materials were constructed for capturing Hg(II) and Ag(I) from water solution. The as-prepared adsorbents were fully characterized and the factors that influence the adsorption performance were investigated. The maximum adsorption of Fe3O4@SiO2-M2 were 0.8 and 1.29 mmol∙g−1 for Hg(II) and Ag(I). The hybrid materials display good adsorption selectivity and 100% selective adsorb Hg(II) with the presence of Ni(II), Mn(II), and Zn(II). Adsorption mechanism suggests sulfur groups play the predominant role during the capture of Hg(II). These hybrid materials exhibit excellent regeneration property and can be reused with practical application value.

Selective and efficient adsorption of anionic dyes by core/shell magnetic MWCNTs nano-hybrid constructed through facial polydopamine tailored graft polymerization: Insight of adsorption mechanism, kinetic, isotherm and thermodynamic study

It is a big challenge to design advanced adsorbents that have high adsorption capacity and excellent selectivity to efficiently remove organic dyes from complex environmental systems. Herein, by utilizing the adhesion property of polydopamine (PDA) and its crosslinking reaction with polyethyleneimine (PEI), a novel core/shell magnetic MWCNTs/Fe3O4@(PDA + PEI) nano-hybrid that carries superior adsorption performance of dyes was constructed through facile polydopamine tailored graft polymerization. In such hierarchical structure, the inner shell of Fe3O4 nanoparticles and outer shell of (PDA + PEI) contributed to the abundant active adsorption sites, large specific surface area (126 m2/g) and high saturation magnetization value (10.91 emu/g). As a result, the prepared adsorbent exhibited highly selective adsorption performance toward multiple anionic dyes, including MB, CR, and MO with maximum adsorption capacity of 1449, 1006, and 935 mg/g at 298.15 K, respectively. It was found that the main adsorption mechanism was attributed to the hydrogen bonding and electrostatic interaction. The kinetics data fitted well with the pseudo-second-order model, and both the Langmuir and Freundlich isotherm models presented well fit to the isotherm data. The investigation of thermodynamic study indicated that the adsorption of anionic dyes onto core/shell magnetic MWCNTs/Fe3O4@(PDA + PEI) nano-hybrid was spontaneous and endothermic. More importantly, the adsorbent presented excellent regeneration property after multiple adsorption-desorption cycles and prominent stability in harsh environments, especially in the alkaline condition. Therefore, these results revealed the promising applications of hierarchical MWCNTs/Fe3O4@(PDA + PEI) nano-hybrid in water remediation.

Carboxyl-functionalized magnetic porous organic polymers as efficient adsorbent for wastewater remediation

Decontamination of toxic pollutants by porous nanomaterials with high removal efficiency has aroused immense concern in recent years. Herein, the newly designed magnetic porous organic polymers with abundant carboxyl groups (CMPOPs) were prepared via a facile in-situ surface polymerization strategy and their adsorption performance towards malachite green (MG) in aquaculture wastewater was investigated. The strong interactions between CMPOPs and malachite green, especially the strong electrostatic interaction between carboxyl groups and target molecules, were favorable for adsorption, where the maximum adsorption capacity of CMPOPs was in the range of 569.4–779.1 mg g−1. Furthermore, the contaminant in aqueous solutions can be adsorbed within 2 min when the initial concentration was 100.0 mg L−1. Apart from their superior adsorption performance, the easy separation feature and excellent regeneration property of CMPOPs rendered them to become an alternative adsorbent for toxic contaminant removal from aquaculture wastewater.

Three-layer core-shell magnetic Fe3O4@C@Fe2O3 microparticles as a high-performance sorbent for the capture of gaseous arsenic from SO2-containing flue gas

Gaseous arsenic capture from flue gas is of great concern due to the high toxicity of arsenic. In this study, a new type of sorbent, magnetic Fe3O4@C@Fe2O3 microparticles with a core-shell structure, was designed by taking advantages of the easy separation property of magnetic sorbents and the excellent adsorption property of Fe2O3 for the capture of arsenic. The Fe3O4@C@Fe2O3 material exhibits a three-layer structure with high specific surface area (27.242 m2 g−1), large pore volume (0.181 cm3 g−1) and excellent magnetic properties (74.1 emu g−1). The synthesized Fe3O4@C@Fe2O3 sorbent demonstrates better arsenic capture performance than Fe3O4, Fe3O4@C or commercial Fe2O3 materials. The capture rate of Fe3O4@C@Fe2O3 for gaseous As2O3 could reach 1.94 mg g−1 min−1 in optimal conditions, and its capacity is 36.22 mg g−1 with a breakthrough threshold of 50%. The performance tests indicate that gaseous As2O3 could be efficiently captured from simulated flue gas and that the presence of SO2 and O2 plays a crucial role in As2O3 capture. The capture mechanism indicates that the conversion of Fe3+/Fe2+ during the oxidation of SO2 by O2 can accelerate the formation of highly active chemisorbed oxygen, and then the adsorbed As2O3 can bond with chemisorbed oxygen to from stable Fe(III)-As(V) compound. After magnetic separation, the spent sorbent can be regenerated through alkali desorption, which facilitates the centralized control of arsenic and the recycling of sorbent. Therefore, the Fe3O4@C@Fe2O3 composite is a promising sorbent for gaseous As2O3 capture from SO2-containing flue gas due to its excellent separation and regeneration properties.