APPLIED CLAY SCIENCE
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2024
·
IF 5.3
Fengya Ran,Meng He,Shiyong Sun,Rui Lv,Sen Lin,Ke Wang,Yevgeny Aleksandrovich Golubev,Olga Borisovna Kotova,Elena Leonidovna Kotova
Zeolite products synthesized from mineral materials are receiving widespread attention, while there are few reports on the introduction of heteroatom metals from minerals into zeolites. Herein, the effects of different silicon sources, hydrothermal reaction time and the amount of template on the crystallisation of Fe-ZSM-5 were investigated. The morphology and structure of ZSM-5 were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), X-ray electron spectroscopy (XPS) and scanning electron microscopy (SEM). The catalysis of 3,3′,5,5′-tetramethylbenzidine (TMB) by Fe-ZSM-5 was then carried out to evaluate its enzyme-like catalytic performance as a type of nanozyme catalyst. The results showed that Fe-ZSM-5 exhibited peroxidase-like activity, oxidizing TMB into a colored substance in the presence of hydrogen peroxide (H 2 O 2 ). Kinetic analysis implied that, compared with natural horseradish peroxidase (HRP), Fe-ZSM-5 peroxidase mimics exhibit inferior affinity and enzymatic catalytic velocity towards the TMB substrate. However, it exhibited excellent stability under extreme pH, temperature, and ionic strength conditions. This work provides a possible reference for the construction of functional nanozymes using natural mineral resources.
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JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Bin Liu,Danjing Lu,Tianliang Zhang,Yixun Shen,Zhen Qiu,Xin Mao,Ruoxi Wu
Landfill leachate, with its high concentrations of persistent organic pollutants, salts, heavy metals, and emerging contaminants, presents significant environmental challenges. This study investigated the combination of dielectric barrier discharge (DBD) and ferrate (Fe(VI)) pretreatment technology in landfill leachate treatment, focusing on its effectiveness in enhancing oxidation performance and mitigating membrane fouling. The results indicated that after DBD/Fe(VI) treatment, TOC and UV 254 removal efficiencies increased by 44 % and 67 %, respectively. Additionally, the DBD/Fe(VI) system excelled in removing fluorescent substances and high molecular weight organic compounds, thereby reducing the formation of the cake layer on the nanofiltration membrane. This system enhanced oxidation performance through the synergistic production of reactive intermediates, with Fe(V)/Fe(IV) and •OH being the main active species, O 2 •- , and 1 O 2 also contributing significantly. The degradation pathway of perfluorooctanoic acid was investigated by utilizing it as the representative pollutant. Compared to the raw landfill leachate system, the DBD/Fe(VI) increased membrane flux by 104 %, while reducing reversible and irreversible fouling resistances by 67 % and 75 %, respectively. Furthermore, the advantages and practical application potential of the DBD/Fe(VI) system were evaluated from energy consumption, economic cost, and carbon dioxide emissions. The study offers an innovative method for landfill leachate treatment and fouling mitigation.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Siyuan Zhu,Jun Ke,Zhongnan Chen,Zhaoyang Yan,Lulu Zhao,Xinhong Qiu
Secondary aluminum dross (SAD) as a hazardous waste has been widely studied on recycling by acid leaching process, but residues accounting for approximately 50 wt% of SAD are still produced and rarely reused. In this study, residues from secondary aluminum dross are retrieved to fabricate Fe-based acidized aluminum ash sludge (FAS) heterojunction catalyst for photocatalytic degrading tetracycline hydrochloride under visible light, which does not only reduce resource utilization cost of SAD, but also realize efficient wastewater treatment by clean photocatalytic technique. Firstly, acidized sludge was obtained from SAD via an acid leaching and then utilized to fabricate FAS by calcination method. From the results of characterizations, BaFeO 3-x and Fe 2 O 3 were demonstrated to be deposited on the surface of acidized sludge, resulting in the successful formation of FAS heterojunction catalyst. As a result, the FAS exhibits an excellent performance in the removal of tetracycline hydrochloride (TCH), reaching to 92.2 % within 150 min under dark adsorption and visible light excitation. To further broaden the application of FAS in actual circumstance, the degradation of mixed dye in wastewater and actual medical wastewater were conducted over the optimal sample of FAS. After four cycles, the removal ability remained at 86.0 %, which shows the exceptional stability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 25
·36702-36715
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IF 0
Jin Hanyu,Song Zhongxian,Luo Yulong,Mao Yanli,Yan Qun,Huang Zhenzhen,Kang Haiyan,Yan Xu,Xing Jiajing,Wu Yongle
The composite material SBC-Fe-x with sludge and Fe 3+ was developed by different calcination temperatures (600, 700, and 800 °C) for the removal of tetracycline (TC). The adsorption rates of SBC-Fe-600, SBC-Fe-700, and SBC-Fe-800 were 77.5%, 89%, and 91%, respectively. Furthermore, the Langmuir model indicated that the maximum adsorption capacity of SBC-Fe-700 (157.93 mg/g) was three times greater than that of SBC-Fe-600. The conclusions were confirmed by a series of characterizations that SBC-Fe-700 showed a larger specific surface area, well-developed pore structure, rich oxygen-containing functional groups and a high degree of graphitization. The results of pH experiments indicated the broad applicability of SBC-Fe-700 for TC adsorption. In addition, SBC-Fe-700 suggested outstanding performance in different water environments. This work produced a feasible adsorbent for the removal of TC, and a new direction for sludge resource utilization was proposed.
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PubMed
Water Reuse
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2024
·Vol. 14
·期 1
·39-50
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IF 4.3
Huang Yiru,Li Youyou,Zhong Qingwei,Luo Chen
View large Download slide View large Download slide Close modal Metal-organic framework (MOF) materials, characterized by their porosity and large specific surface areas, exhibit excellent adsorption properties. With the aim of removing Te(IV) from environmental aquatic systems, this study is the first to propose the use of MIL-100(Fe). The material reveals a strong adsorption capacity for Te(IV), with maximum adsorption of 531.9 mg/g, superior to other adsorbent materials. Adsorption isotherm and kinetic models indicate that the adsorption process primarily involves monolayer chemical adsorption. According to the thermodynamic parameters, the adsorption reaction is endothermic. The experiment individually examined factors affecting the material's adsorption performance, including adsorbent dose, initial concentration of Te(IV), pH, adsorption time, and coexisting ions. Even under high ion strength conditions and high concentrations of coexisting ions, the material's adsorption efficiency for Te(IV) still reached over 94%. The material has been successfully applied to remove Te(IV) from lake water, river water, and seawater, yielding satisfactory results. Due to the high salinity and ionic strength of the solution, the removal efficiency of Te(IV) in the seawater matrix was slightly lower than that in freshwater (river and lake water). Thus, this material shows promise for the removal of Te(IV) from complex aquatic systems. MIL-100(Fe) was prepared and characterized. The Te(IV) can be adsorbed by MIL-100(Fe) effectively, and the adsorption process was primarily a monolayer chemical adsorption and an endothermic reaction. The Te(IV) can be removed effectively in environmental water supplies by MIL-100(Fe).
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Journal of Water Process Engineering
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2024
·
IF 6.3
Long Fang,Xi Zheng,Ruina Yuan,Tianyuan Xu,Minwang Laipan,Yijun Cao,Yaowen Xing,Xiahui Gui
Persulfate (PS)-based advanced oxidation process is an excellent technology for removing organic pollutants. Herein, an Al-Fe‑carbon hybrid composite (AlFeOH/CS) by hybridizing bimetal Al-Fe and carbon sphere was synthesized and its ability to activate PS was evaluated. Within 120 min reaction in the presence of PS, 70 % of aniline was removed by FeOH/CS, while >99.9 % of aniline was degraded by AlFeOH/CS. Moreover, AlFeOH/CS exhibited wide pH applicability, relatively high resistance to inorganic anions, and strong stability for PS activation. Electron paramagnetic resonance (EPR) and quenching tests revealed that aniline degradation in the AlFeOH/CS/PS system occurred via a radical pathway, with O 2 − the dominant reactive oxygen species. The enhanced photocatalytic activity of AlFeOH/CS was attributed to: Al doping could 1) increase the specific surface area and porosity, exposing more active sites, 2) facilitate electron transfer from Fe atoms to PS, and 3) enhance the generation of carbon-centered persistent free radicals (PFRs). Depending on the carbon-centered PFRs, carbonyl functional groups, sp 2 and sp 3 -hybridized carbon, and Fe/Al hydroxides on AlFeOH/CS, PS was effectively activated to produce free radicals for aniline degradation. These findings provide new insights into the design of functional hydrothermal carbonaceous material with high stability and PS activation efficiency for removing organic contaminants.
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CHEMISTRY-A EUROPEAN JOURNAL
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2025
·
IF 3.7
Kaiyu Liu,Yanzhen Qiu,Wenqi Liu,Zhe Feng,Huimin Jiang,Jianjian Lin
Graphical We have synthesized Fe-doped CoNi 2 S 4 @CC with sulfur vacancies (Fe-CoNi 2 S 4-x @CC). The catalyst exhibited excellent OER and overall water splitting performance, which is attributed to the fact that vacancy engineering and iron doping synergistically promote charge transfer to enhance the catalyst performance. Transition metal sulfides have emerged as promising alternatives to precious metal catalysts for sustainable electrocatalytic hydrogen production. However, achieving simultaneous optimization of active site exposure and vacancy-electron interplay remains a critical challenge. Herein, we develop a dual-regulation strategy integrating Fe-doping and high-temperature annealing to synthesize sulfur-deficient Fe-doped CoNi 2 S 4 @CC nanocatalysts (Fe-CoNi 2 S 4-x @CC). The approach innovatively combines heteroatom doping and vacancy engineering, where iron doping leads to lattice dilation and sulfur vacancies create vacancy defects, thereby exposing a large number of active sites. The designed catalysts have iron-induced charge redistribution and vacancy tailored adsorption energies synergistically in the dual active center and expose more active sites to accelerate charge transfer. Intriguingly, the Fe-CoNi 2 S 4-x @CC achieves a low overpotential of 194.72 mV@10 mA cm −2 in alkaline media, surpassing most reported CoNi-based sulfides. More remarkably, it demonstrates exceptional kinetics with a Tafel slope of 43.2 mV dec −1 and enhanced active site utilization evidenced by its high electrochemical double layer capacitance value (31.3 mF cm −2 ). This work presents a significant advance for the rational design of high-performance OER catalysts by demonstrating a synergistic modulation strategy that integrates cation doping and vacancy engineering in Fe-doped CoNi 2 S 4 @CC, which not only optimizes the electronic structure but also increases the rate of charge transfer to enhance the catalytic activity.
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JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Tongxin Xiao,Kangyue Qiao,Guodong Hao,Songyao Du,Yue Wang,Chao Sui
This study employed a solvothermal method to prepare an NH 2 -MIL-101(Fe, Co) bimetallic organic framework composite catalyst aimed at enhancing the photocatalytic reduction performance of Cr(VI). The experimental results show that introducing Co into the single-metal NH 2 -MIL-101(Fe) does not alter the material's octahedral structure. However, the bimetallic synergistic effect shifts the light absorption range to the red end of the spectrum, reduces the bandgap, and significantly improves carrier separation efficiency. Under visible light irradiation, the NH 2 -MIL-101(Fe, 0.15Co) catalyst exhibited outstanding photocatalytic performance, achieving a reduction efficiency of 94.7% for Cr(VI) within 40 minutes and 100% within 50 minutes, with a reaction rate constant 4.7 times that of the single-metal NH 2 -MIL-101(Fe). Free radical capture experiments further revealed that ·O 2 - is the key active species in the Cr(VI) reduction process, while photo-generated holes in the valence band can oxidise OH - to ·OH, synergistically participating in the reaction. Additionally, cyclic stability experiments showed that the catalyst maintained 85.8% reduction efficiency after five cycles, demonstrating excellent stability and practical application potential.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Sihan Ma,Xinglin Yu,Zheng Han,Deng Long,Wentao Li,Jianglong Kong,Xue Bai
Bi 2 O 3 -based photocatalytic materials exhibit significant potential for pollutant and bacterial removal. However, their practical application in efficient water treatment is hindered by two key challenges, including an insufficient suppression of photogenerated carrier recombination and a narrow bandgap that restricts light absorption to low-density wavelengths. Additionally, while the Fenton reaction enhances catalytic activity, its effectiveness is compromised by iron sludge formation resulting from the rapid release of iron ions. In this work, BiO 2-x @Fe nanospheres were successfully synthesized via a facile hydrothermal method, integrating synergistic photocatalytic and Fenton-like activities. These nanospheres demonstrate exceptional performance in simultaneous bacterial inactivation and organic pollutant degradation under light irradiation . The strategic introduction of defect-rich active sites and surface hybrid architectures effectively suppresses photogenerated carrier recombination while retarding iron ion release kinetics, thereby enabling superior catalytic performance. This dual-functional system, integrating enhanced photocatalytic oxidation and Fenton-driven antibacterial mechanisms, achieves near-complete bacterial inactivation and efficient organic pollutant degradation under visible light irradiation. The synergistic interaction between photocatalysis and Fenton chemistry demonstrates exceptional potential for rapid, high-efficiency water purification applications.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Li Song,Weiguo Zhang,Quan Liu,Xiao Zhang,Fuqiang Liu,Aimin Li
Various organic acids commonly coexist with Cr(VI) in wastewater. However, direct electron transfer between Cr(VI) and electron-rich organic acids is typically slow. Current Fe-based mediators primarily operate through the aqueous Fe(III)/Fe(II) cycle, which faces challenges in achieving efficient Fe recycling. To address the efficient removal of Cr(VI) and sodium citrate (Cit) composite pollutants (Cr(VI)-Cit), iron-loaded carbon nitride composites (Fe/CN) were synthesized via a combined loading-calcination approach. Crucially, coordination between carboxylate groups of Cit and undercoordinated Fe sites on Fe/CN formed photoactive complexes, effectively stimulating ligand-to-metal charge transfer (LMCT). This significantly enhanced the solid-phase Fe(III)/Fe(II) cycling efficiency, leading to a markedly increased Cr(VI) reduction rate constant ( k ) of 0.213 mg/(L·min). Furthermore, coordination with the N-rich matrix effectively inhibited Fe leaching, resulting in a post-reaction total Fe concentration below 0.5 mg/L. The formation of a Cr(VI)-Fe-Cit ternary cyclic complex effectively lowered the activation energy for Cr(VI) reduction by 81.3% compared to pristine CN. In the dark, intramolecular electron transfer within this complex generated Fe(II)-Cit species with a low electrode potential. Under irradiation, the photoactive Fe(III)-Cit complex generated Fe(II) via LMCT to reduce Cr(VI); concurrently, photogenerated electrons (e - ) and superoxide radicals (·O 2 - ) also contributed to Cr(VI) reduction. Reusability tests showed Fe/CN retained ∼90% Cr(VI) removal efficiency from actual wastewater over 5 cycles, demonstrating good stability under realistic conditions. This study provides valuable insights for the cost-effective and efficient remediation of Cr(VI)-organic acid complexes in real wastewater.
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ChemistrySelect
·
2025
·Vol. 10
·期 27
·e01268
·
IF 2
Zhengfang Yang,Qianqian Guo,Qisheng Wang,Qing Wang,Guanbin Wen,Bin Zhang,Yanli Nie
Graphical Using macadamia nut shell from Yunnan as raw material to prepare antibacterial material can save resources. Combining NiO with AC, adding Bi and Fe to optimize antimicrobial properties and magnetic properties.A kind of antibacterial, adsorption-degradable, recyclable and reusable material was constructed.The composite materials show a good prospect in the practical application of water treatment. Although inorganic antibacterial materials that use photocatalytic technology are widely used to inhibit bacterial growth in water bodies, the external light environment limits the efficient utilization of photocatalytic antibacterial materials. The antibacterial materials are usually in powder form and are not conducive to recycling and reuse, limiting their development in practical applications. The main antibacterial ingredient (nickel oxide) was combined with Macadamia nutshell activated carbon (AC) to maintain efficient contact between bacteria and antibacterial active ingredients to apply the material for water treatment. First, different activators (H 3 PO 4 , ZnCl 2 , and KOH) were used to prepare activated carbon (AC) from Macadamia nutshells. Among the three activators, the AC prepared with H 3 PO 4 exhibited the largest specific surface area with well-dispersed pores. Then, Bi and Fe were doped to AC-NiO to improve their antibacterial and magnetic properties. After doping, the antibacterial rate increased to 95% with significantly improved magnetic properties. Moreover, AC-NiO/Bi and AC-NiO/Fe exhibited three antibacterial mechanisms: physical damage, ionic dissolution, and oxidative stress. Finally, the antibacterial test was performed on real water samples from Dianchi Lake in China. Results suggested that AC-NiO/Bi and AC-NiO/Fe could destroy microorganisms in river water samples. The material showed significant adsorption and degradation efficiency for malachite green, methylene blue, and methyl orange dyes. Since the composite material possessed excellent magnetic separation performance, it was easily recovered after use, effectively avoiding secondary pollution while reducing the material cost in practical applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Sisi Li,Shuang Li,Xiang Li,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Junjing Hao
Humic acid (HA) was a natural organic macromolecule, which was considered as an ideal carrier for Fenton-like catalysts due to the large number of active functional groups on its surface. For this reason, humic acid-based Fe/Ag bimetallic catalysts (Fe 3 O 4 /HA/Ag) were synthesized by introducing Fe and Ag to the humic acid carrier. The morphology and physicochemical properties of Fe 3 O 4 /HA/Ag was revealed by different characterization methods. In the optimized “Fe 3 O 4 /HA/Ag + H 2 O 2 ” Fenton-like system, Fe 3 O 4 /HA/Ag can rapidly activate H 2 O 2 and accelerate electron transfer. It was applied for sulfadiazine (SDZ) degradation and the removal efficiency reached nearly 100 %. After five cycle experiments, the degradation percentage was maintained at 88.7 %, showing excellent regeneration ability. In addition, Fe 3 O 4 /HA/Ag has good resistance to co-existing ions and different water matrices. The main active substances in the “Fe 3 O 4 /HA/Ag + H 2 O 2 ” system were hydroxyl radicals (•OH), superoxide radicals (•O 2 − ) and singlet oxygen ( 1 O 2 ), which supported by EPR and XPS analysis. This study provides a new way for the promotion of SDZ degradation through bimetallic co-catalytic activation of H 2 O 2 , which has significant potential for the treatment of antibiotic wastewater.
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