CHEMOSPHERE
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2024
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IF 8.1
Shizong Wang,Jun Hu,Jianlong Wang
In this study, Fe 0 @Fe 3 O 4 was synthesized and used to remove U(VI) from groundwater. Different experimental conditions and cycling experiments were used to investigate the performance of Fe 0 @Fe 3 O 4 in the U(VI) removal, and the XRD, TEM, XPS and XANES techniques were employed to characterize the Fe 0 @Fe 3 O 4 . The results showed that the U(VI) removal efficiency of Fe 0 @Fe 3 O 4 was 48.5 mg/g that was higher than the sum of removal efficiency of Fe 0 and Fe 3 O 4 . The uranium on the surface of Fe 0 @Fe 3 O 4 mainly existed as U(IV), followed by U(VI) and U(V). The Fe 0 content decreased after reaction, while the Fe 3 O 4 content increased. Based on the results of experiments and characterization, the enhanced removal efficiency of Fe 0 @Fe 3 O 4 was attributed to the synergistic effect of Fe 0 and Fe 3 O 4 in which Fe 3 O 4 accelerated the Fe 0 corrosion that promoted the progressively formation of Fe(II) that promoted the reduction of adsorbed U(VI) to U(IV) and incorporated U(VI) to U(V). The performance of Fe 0 @Fe 3 O 4 at near-neutrality condition was better than at acidic and alkalic conditions. The chloride ions, sulfate ions and nitrate ions showed minor effect on the Fe 0 @Fe 3 O 4 performance, while carbonate ions exhibited significant inhibition. The metal cations showed different effect on the Fe 0 @Fe 3 O 4 performance. The removal efficiency of Fe 0 @Fe 3 O 4 decreased with the number of cycling experiment. Ionizing radiation could regenerate the used Fe 0 @Fe 3 O 4 . This study provides insight into the U(VI) removal by Fe 0 @Fe 3 O 4 in aqueous solution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2013
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IF 3.925
Xiaoshu Lv,Guangming Jiang,Xiaoqin Xue,Donglei Wu,Tiantian Sheng,Chen Sun,Xinhua Xu
In this study, Fe 0 -Fe 3 O 4 nanocomposites embedded polyvinyl alcohol (PVA)/sodium alginate (SA) beads were synthesized, which exhibited an excellent physical properties and catalytic reactivity, and a robust performance of post-separation (complete separation using a simple grille) and reusability (efficiency of 69.8% after four runs) in Cr(VI) removal. 5.0 wt% PVA with 1.5 wt% SA was the optimal proportion for beads molding, and the followed acidification and reduction treatments were critical to ensure high mechanical strength and high Cr(VI) removal ability of beads. Effects of Fe 0 and Fe 3 O 4 mass fraction, initial pH and Cr(VI) concentration on final removal efficiency were also evaluated. Merely 0.075 wt% Fe 0 together with 0.30 wt% Fe 3 O 4 was sufficient to deal with 20 mg L −1 Cr(VI) solution. The efficiency decreased from 100 to 79.5% as initial Cr(VI) increased from 5 to 40 mg L −1 , while from 99.3 to 76.3% with increasing pH from 3.0 to 11.0. This work provides a practical and high-efficient method for heavy metal removal from water body, and simultaneously solves the problems in stabilization, separation and regeneration of Fe 0 nanoparticles.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shizong Wang,Jianlong Wang
High efficient activator is highly desired in the field of persulfate-based advanced oxidation process. In comparison with the previous studies, this study adopted nitrogen, sulfur and oxygen co-doped carbon material to support Fe 0 encapsulate in Fe 3 O 4 to prepare iron-based modified carbon composite (Fe 0 @Fe 3 O 4 -MC) by a facile two-step pyrolysis. Fe 0 @Fe 3 O 4 -MC was then used for degradation of sulfamethoxazole. The results showed that Fe 0 @Fe 3 O 4 -MC had superior catalytic activity for PMS activation due to the synergistic effect of iron-based compound and modified carbon. In the presence of 0.1 g/L of Fe 0 @Fe 3 O 4 -MC, SMX (0.04 mM) could be completely degraded within 120 min at pH 3.4 and 3 mM of PMS. The SMX degradation followed pseudo first-order kinetic model, with the rate constant of 0.12 min −1 , and the mineralization of SMX achieved 48.4%. Sulfate radicals dominated in the SMX degradation. In addition to Fe 0 and Fe 3 O 4 , carbon defects, graphitic N, sulfur and FeN 4 also contributed to PMS activation. Fe 0 oxidation was the rate-limiting step for PMS activation. Dissolved oxygen made a minor contribution to Fe 0 oxidation. The intermediate products of SMX degradation were identified, and two pathways of SMX degradation were proposed. The influencing factors on SMX degradation were studied, including pH, temperature, PMS concentration, Fe 0 @Fe 3 O 4 -MC dosage, chloridion, carbonate and humic acids, and the influencing mechanism was discussed. This study could provide an efficient PMS activator for the degradation of emerging organic pollutants in water and wastewater.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Yating Yan,Huayu Zhang,Wei Wang,Wenchao Li,Yueping Ren,Xiufen Li
Developing highly efficient, reusable, non-toxic and low-cost catalysts is of great importance for persulfate-based advanced oxidation processes (AOPs). In this work, ferrocene was mixed into paraffin to prepare a candle, and the iron-containing candle soots were collected and heated at 500 °C~900 °C under N 2 atmosphere for 1 h to prepare magnetically recyclable Fe 0 /Fe 3 O 4 @porous carbon (Fe 0 /Fe 3 O 4 @PC) catalysts. The Fe 0 /Fe 3 O 4 @PC-700 obtained after pyrolysis at 700 °C exhibited the best catalytic activity for sulfamethoxazole (SMX) degradation. 10 mg/L SMX could be completely degraded within 10 min by 0.2 g/L of Fe 0 /Fe 3 O 4 @PC-700 and 0.5 mM PMS at pH 5.0. The carbon shell effectively inhibited the Fe leaching of Fe 0 /Fe 3 O 4 @PC-700, and 99.73% of Fe was retained after five consecutive cycles. In the Fe 0 /Fe 3 O 4 @PC-700/PMS system, SMX was degraded through the sulfate radical (SO 4 · ¯ ), hydroxyl radical (·OH), superoxide radical (O 2 · ¯ ) dominated radical pathway, and the singlet oxygen ( 1 O 2 ) dominated non-radical pathway. The coexisting inorganic ions and natural organic matters (NOM) in actual water inhibited the degradation of SMX. Finally, four possible degradation pathways were proposed based on the degradation intermediates of SMX. This work provides a facile heat treatment of iron-containing candle soots strategy to prepare the metal@carbon catalysts for PMS-based AOP.
研究领域:
环境科学
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催化材料
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水处理技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yong Feng,Jie Zhong,Liyuan Zhang,Yiang Fan,Zequn Yang,Kaimin Shih,Hailong Li,Deli Wu,Bo Yan
Nanoscale zero-valent iron (nZVI) is highly promising for oxidative removal of micropollutants by initiating advanced oxidation processes , but its vulnerability to deactivation due to the surface oxidation is challenging. In this study, we propose Fe 0 @Fe 3 O 4 core–shell nanowires (CSNWs) as a novel activator to generate radicals for atrazine, a representative micropollutant, degradation via the activation of peroxymonosulfate (PMS). Fe 0 @Fe 3 O 4 CSNWs with a shell thickness of around 5 nm were synthesized using a facile chemical reduction approach and were comprehensively characterized using a series of surface sensitive techniques. The results showed that the Fe 0 @Fe 3 O 4 CSNW had great reactivity for atrazine degradation via the activation of PMS; near complete degradation of atrazine was achieved after reaction for only 2 min. Under identical conditions, the pseudo-first order rate constant with Fe 0 @Fe 3 O 4 was more than 36 times greater than that with nano Fe 3 O 4 . The surface activation of PMS contributed only a small proportion to the overall degradation. Instead, the iron released from Fe 0 @Fe 3 O 4 CSNWs primarily activated PMS to generate S O 4 ∙ - that degraded atrazine. The Fe 0 @Fe 3 O 4 CSNWs were stable and no deactivation was observed after exposing Fe 0 @Fe 3 O 4 CSNWs to air for 3 months. The results from this study demonstrate a stable nZVI for oxidative removal of organic contaminants.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Yanping Zhang,Peng Xiangshi,Jiayu Tian,Fen Li,Xuteng Fan,Liran Ma,Ruijun Zhang
Waste waterworks sludge and walnut shell were employed to synthesize a composite catalyst consisting of Fe 0 /Fe 3 O 4 /biochar using a one-step pyrolysis process . The synthesized catalyst was applied to active peroxymonosulfate (PMS) for studying the degradation of methylene blue (MB). Various characterization results confirmed that Fe 0 and Fe 3 O 4 were distributed on the surface of composite catalyst, which had a porous structure and large specific surface area of 109.87 m 2 /g. Owning to these structural properties, the composite catalyst presented desirable catalytic capability and reusability. When 0.4 g/L PMS and 0.3 g/L composite catalyst were added into the MB solution (pH 7), 99.9% MB could be degraded within 60 min at a high reaction rate of 0.1550 min −1 , which was much better than that of zero valent iron (ZVI)/PMS system. After the three cycles, the catalyst could still maintain an MB degradation of over 68.0%. The free radical quenching experiments and electron paramagnetic resonance experiments demonstrated that SO 4 − ∙ and HO ∙ were generated during the activation of PMS. The X-ray photoelectron spectrometer analysis revealed that Fe 3 O 4 and various functional groups, such as C O were formed on the composite catalyst, and the Fe 2+ was oxidized to Fe 3+ . Furthermore, the iron leaching experiments indicated that both the homogeneous and heterogeneous reactions occurred during the catalysis of PMS using the synthesized composite catalyst. Acidity and higher temperature were conducive to the catalytic reaction . This study offers a green and sustainable route for simultaneously degrading contaminants and reusing wastes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jie Chen,Jiafeng Wan,Chi Li,Yuhan Wei,Haolin Shi
Fe 0 -Fe 3 O 4 nanoparticles and cerium dioxide hollow spheres as efficient heterogeneous electro-Fenton reagents were rationally designed to be embedded in porous carbon derived from skimmed cotton for the electrocatalytic degradation of ceftriaxone sodium. Skimmed cotton porous carbon material has a hollow tubular structure, and cerium dioxide is dispersed on the surface of the carbon material in a hollow sphere structure of uniform size. Fe 0 -Fe 3 O 4 nanoparticles were wrapped in irregular particle shapes on the surface of cerium dioxide hollow spheres, and the remaining part was laid flat on the surface of porous carbon material. The as-synthesized Fe 0 -Fe 3 O 4 /CeO 2 /C showed excellent degradation efficiency of 95.59 % for ceftriaxone sodium within 120 mins and obtained a COD removal rate of 95.21 % at 240 mins. The zero-valent iron as a reducing agent effectively accelerated the Fe 3+ /Fe 2+ cycle, allowing the composites to exhibit higher catalytic activity and further reducing the possibility of secondary contamination. Moreover, the existence of cerium dioxide further promoted the redox cycle of Ce 4+ /Ce 3+ and accelerated the electron transfer in the interface of the catalyst. The synergistic effect of iron and cerium greatly facilitated the production of hydroxyl radicals and increased the yield of hydroxyl radicals in the reaction system.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Zhe Yang,Xiaowen Ma,Chao Shan,Xiaohong Guan,Weiming Zhang,Lu Lv,Bingcai Pan
To activate zero-valent iron (ZVI) for efficient nitrobenzene (NB) reduction, a hybrid Fe 0 /Fe 3 O 4 /FeCl 2 microcomposite (hZVI bm ) was synthesized via simple ball-milling of the ternary mixture of ZVI, Fe 3 O 4 , and FeCl 2 ·4H 2 O (hZVI). SEM-EDX and time-of-flight secondary ion mass spectroscopy (ToF-SIMS) indicated the hZVI bm microcomposite (10–20 μm) consisted of Fe 0 core covered by ∼3.3 μm-thick shell decorated with Fe 3 O 4 /FeCl 2 fine particles (0.1–2 μm). Efficient removal (>95%) of NB (200 mg/L) was achieved by hZVI bm (2.0 g Fe/L) in 30 min over a wide pH range from 3 to 9. Notably, the NB removal efficiency of hZVI bm was over 30 times higher than the virgin ZVI or over three times higher than hZVI. The enhanced reactivity synergistically resulted from both chemical and physical aspects. Chemically, the Fe 3 O 4 /FeCl 2 -inlaid shell and the Fe(II) components played significant activation roles, as observed from the comparative experiments in their absence via pretreatments of hZVI bm by sonication and rinsing, respectively, with direct evidence of depassivation effect by XRD analysis. Physically, the ball-milling-induced inter-particle compaction effect was considered crucial to facilitate the interfacial mass/electron transfer processes during the reduction. The reduction pathway from NB to aniline via two intermediates was analyzed by liquid chromatography.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
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IF 7.8
Zhiqian Lin,Huaiqing An,Liyuan Qian,Yun Wang,Haibin Lin,Xiaofei Wang,Guojun Zou,Jinlong Zhu,Songbai Han
Propane dehydrogenation (PDH) is a key process for propylene production, but conventional catalysts are often constrained by high cost, environmental impact, and limited stability under harsh reaction conditions. Fe-based catalysts offer a cost-effective and sustainable alternative due to their intrinsic ability to activate C–H bonds in alkanes. However, precise control over the oxidation state and coordination environment of Fe species to balance PDH activity and stability remains challenging. Herein, we develop a molten-salt-assisted synthesis strategy integrated with CeO2–x-mediated interfacial engineering to finely tune the structural and electronic properties of Fe species supported on Al2O3. The molten salt medium enables uniform dispersion and controlled crystallization of Fe3O4, effectively mitigating its over-reduction during high-temperature H2 treatment. The subsequent incorporation of CeO2–x modulates the local electronic structure of Fe3O4, inducing a controlled partial reduction to metallic Fe0 and forming a well-defined Fe0–Fe3O4 dual-interface architecture. This interfacial electronic reconstruction enriches the electron density of low-valent Fe sites, facilitating efficient charge transfer during propane activation and promoting rapid propylene desorption. As a result, the optimized catalyst demonstrates accelerated PDH kinetics, high propylene selectivity, and enhanced resistance to coking. This work establishes a scalable route for constructing dual-interface active sites, providing a general design principle for low-cost, high-performance PDH catalysts.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Xiyue Xue,Yanpeng Chen,Yuxin Xiao,Saidi Wang,Hongjie Zhang,Jin Wang,Wen-Hui Zhang
This study pioneers a sustainable “waste-to-wealth” strategy for fabricating a high-performance, pH-universal Fenton-like catalyst (FeCu 2 @BC T4 ) through the one-step co-pyrolysis of acid-precipitated black liquor (APBL) and Fenton sludge with a copper precursor. The innovation lies in the precise engineering of a Fe 0 /Fe 3 O 4 heterojunction synergistically coupled with Cu 0 nanoparticles on a functional APBL-derived biochar. By tuning the Cu/Fe mass ratio and pyrolysis time, the phase composition and electron-transfer properties were optimized. The resulting catalyst exhibits exceptional activity and stability across a broad pH range (3–9), achieving >92.3% methylene blue degradation within 60 min, and demonstrates superior removal efficiency toward various cationic dyes (rhodamine B, crystal violet, malachite green) and an anionic dye (methyl orange). Mechanistic investigations reveal a clear pH-governed transition of reactive oxygen species (ROS) pathways: under acidic conditions (pH 3), •OH-dominated homogeneous–heterogeneous catalysis prevails; under neutral conditions, the system shifts to a heterogeneous process driven by synergistic •OH/ 1 O 2 oxidation. This unique ROS switch is sustained by efficient electron mediation from the biochar matrix, coupled with robust electron supply and transfer enabled by the Fe 0 /Fe 3 O 4 heterojunction and Fe Cu galvanic coupling. This work provides a novel paradigm for converting industrial solid wastes into advanced catalytic materials with a well-elucidated mechanism, effectively overcoming the critical pH limitation of conventional Fenton technologies and showing broad application prospects for organic wastewater remediation.
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产品关联
DOI
高影响因子
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