CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Nie,Hui Feng,Haijun Wang,Yubin Hu,Lixin Cao,Bohua Dong
The sulfion oxidation reaction (SOR) presents an efficient pathway for hydrogen production via seawater electrolysis, as its anode voltage is substantially lower than that of the oxygen evolution reaction (OER). This thermodynamic advantage significantly reduces energy consumption while effectively suppressing chlorine evolution and related side reactions, thereby improving both the efficiency and economic feasibility of seawater electrolysis systems. Nevertheless, to achieve the practical application of SOR in real seawater electrolysis, it is still necessary to develop electrocatalysts with both high activity and long-term stability to withstand the harsh seawater environment under high current density. Herein, this study successfully synthesized Cr-doped Co 3 S 4 (Cr-Co 3 S 4 ) nanowires for the SOR. Cr doping reduces part of Co 3+ to active Co 2+ , and the high reducing property of Co 2+ accelerates the progress of SOR. In-situ Raman spectra and Density functional theory (DFT) calculations show that Cr doping optimized the adsorption of sulfion and polysulfide ions on Co 3 S 4 and the efficient desorption of S 8 , which improved the catalytic activity and stability. Furthermore, Cr-Co 3 S 4 only requires 0.596 V to achieve a current density of 100 mA cm −2 in the SOR-HER coupled system and maintains stability for 250 h. This work demonstrates a promising strategy for hydrogen production via sulfion-oxidizing mixed electrolysis of seawater, enabling energy-efficient hydrogen generation alongside sulfion-containing wastewater treatment. It thus provides a synergistic approach to green hydrogen production and environmental remediate.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Ziyang Xu,Zicheng Yang,Jiale Ni,Yi Feng,Jianfeng Yao
The functionalization of metal organic frameworks (MOFs) with tailored ligands offers a promising pathway for enhancing their catalytic performance in CO 2 fixation. This work systematically explores the impact of ligand engineering in MIL-101(Cr) through carboxyl (–COOH) and amino (–NH 2 ) functionalization for the CO 2 cycloaddition reaction. Comprehensive characterizations of pristine MIL-101 and functionalized MILs involving MIL-101-COOH, MIL-101-NH 2 , and MIL-101-COOH/NH 2 reveal that –COOH functionalization significantly enhances the surface area (2717 m 2 /g) and reduces the activation energy (17.1 kJ/mol vs. 23.1 kJ/mol for pristine MIL-101), whereas –NH 2 groups improve the CO 2 binding strength but compromise the crystallinity and surface area (532 m 2 /g). Under mild conditions (80 °C and 0.1 MPa CO 2 ), MIL-101-COOH achieves >99 % yield for CO 2 cycloaddition with epichlorohydrin at 8 h and maintains stability over ten cycles, outperforming other MILs (72–82.5 % yields). This work establishes ligand engineering, especially –COOH functionalization, as a critical strategy to optimize MILs for CO 2 fixation to produce cyclic carbonates.
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Journal of Cleaner Production
·
2025
·
IF 10
Jialin Chen,Jingfei Zhou,Shoukai Chen,Haibo Shi,Qingfeng Hu,Yingdong Tang
It is anticipated that this would address the underlying reasons of the disposal challenges and associated safety hazards if Cr-containing tannery waste from the tannery industry could be produced into stabilized sustainable construction materials. In this paper, the geopolymer was prepared employing solid waste furnace slag (FS) and tannery sludge powder (TSP) and evaluated for mass loss rate, appearance, residual compressive strength, pore properties, phase transformation and Cr leaching behavior after different thermal exposure (200 °C, 400 °C, 600 °C, 800 °C, and 1000 °C) for 2 h. The results revealed that the compressive strength increased and then dropped with increasing thermal exposure temperature, with the residual compressive strength of geopolymer being the maximum (63.00 MPa) at 200 °C. Dehydroxylation and phase transition disrupted the pore structure, and the hydration products, mostly C-(A)-S-H, underwent depolymerization and repolymerization to create new crystalline phases including akermanite and gehlenite. Even at 600 °C, which has the greatest impact on the safety of geopolymers, the leaching concentrations of total Cr and Cr (Ⅵ) were only 1.39 mg/L and 0.074 mg/L, respectively, which were still far below the standard requirements. The possible Stabilization-Migration-Restabilization (SMR) route of Cr was identified as follows: Cr was physically encapsulated by C-(A)-S-H at 20 °C–400 °C; C-(A)-S-H was destroyed at 600 °C–800 °C, and Cr migrated and was oxidized to Cr (Ⅵ) by CaO; it was then probably reduced to Cr(V) by heat and Mg-O at 1000 °C and finally immobilized in akermanite by chemical bonding.
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Materials
·
2024
·
IF 3.1
Xiaofei Hao,Ran Wang,Xiumin Tan,Xiufeng Zhang,Xupo Liu,Zhaoyang Wu,Dongli Yuan
Fabricating efficient oxygen evolution reaction (OER) electrocatalysts is crucial for water electrocatalysis. Herein, the spinel-type high-entropy oxides of (Co, Fe, Mn, Ni, Cr) 3 O 4 were synthesized through the high-temperature calcination approach. The influences of calcination temperatures on structures and electrochemical properties were investigated. The optimized catalyst of HEO-900 contains the hybrid structure of regular polyhedrons and irregular nanoparticles, which is beneficial for the exposure of electrochemically active sites. It was identified that the abundant high-valence metal species of Ni 3+ , Co 3+ , Fe 3+ , Mn 4+ , and Cr 3+ are formed during the OER process, which is generally regarded as the electrochemically active sites for OER. Because of the synergistic effect of multi-metal active sites, the optimized HEO-900 catalyst indicates excellent OER activity, which needs the overpotential of 366 mV to reach the current density of 10 mA cm −2 . Moreover, HEO-900 reveals the prominent durability of running for 24 h at the current density of 10 mA cm −2 without clear delay. Therefore, this work supplies a promising route for preparing high-performance multi-metal OER electrocatalysts for water electrocatalysis application.
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PubMed
高影响因子
Coatings
·
2025
·Vol. 15
·期 12
·1449
·
IF 2.8
Asen Dimov,George R. Ivanov,Leonard Keil,Andreas Terfort,Jinxuan Liu,Velichka Strijkova
HighlightsWhat are the main findings?A metal–organic Framework (MOF) MIL-101(Cr) with crystal sizes around 20 nm was synthesized and the results were compared to a 300 nm crystal-sized commercially available material.What are the implications of the main findings?Smaller-sized MIL-101(Cr) crystals form a stable insoluble monolayer at the air–water interface with denser, more homogeneous water coverage and packing upon compression, and no visible micrometer-sized aggregates.Langmuir-Blodgett monolayers from the 20 nm MOF show six times lower surface roughness.Metal–Organic Frameworks (MOFs) have diverse applications due to their tunable porosity, large surface area, and diverse chemical functionalities. Among them, one of the most researched MOFs is MIL-101(Cr), which, in addition, is very stable in water. We have used a commercially available substance with approximately 300 nm large crystals for the preparation of a sensing nano-thin layer for the emerging water contaminant PFOS, due to its high selectivity towards this compound. Here, we have synthesized 20 nm sized crystals of MIL-101(Cr), which are among the smallest reported, and compared them to the same material with 300 nm sized crystals. The material was characterized by TEM and XPS. It was possible to prepare insoluble monolayers at the air–water interface (Langmuir films), which were characterized with film compression isotherms, Brewster angle microscopy, and surface potential measurements. The Langmuir–Blodgett (LB) method was used to deposit monolayers on Si wafers and 434 MHz Surface Acoustic Wave resonator simultaneously. The LB layers were very stable over time. The smaller-sized MIL-101 (Cr) crystals exhibit denser, more homogeneous water coverage and packing upon compression, with no observable 10–100 µm aggregates. LB monolayers from the 20 nm particles have approximately six times lower surface roughness. The LB monolayer is far from being smooth, but this will allow excellent access to the MOF pores by the tested analyte in a chemical sensing application. The lack of research on depositing presynthesized MOFs using probably the best method for nanoarchitectonics—the LB method—is addressed. The 20 nm sized MOF crystals are the smallest deposited by this method so far.
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RARE METALS
·
2025
·
IF 11
Lei Zhang,Jianhao Qiu,Biyao Fang,Guanglu Xia,Chen Chen,Meng Liu,Yixin Li,Yiliang Chen,Jianfeng Yao
Defects can tune the band structure of semiconductors, thereby reconfiguring the corresponding heterojunctions. In this study, coralloidal Bi 2 S 3 @In 2 S 3 heterostructures rich in sulfur vacancies were successfully developed via a one-step hydrothermal method with content regulation of the sulfur source. In 2 S 3 nanosheets are evenly distributed along Bi 2 S 3 nanorod clusters, imparting a unique coralloidal structure and compact interfacial contact that accelerates the transportation of photoinduced electrons and holes. Moreover, the sulfur vacancy strengthens the light absorption and enables staggered energy band alignment for Bi 2 S 3 @In 2 S 3 heterostructures, which further promotes charge carrier separation. Owing to these favorable features, the coralloidal Bi 2 S 3 @In 2 S 3 heterostructure with rich sulfur vacancies exhibited a high photocatalytic efficiency for Cr(VI) reduction, whose reaction rate constant is 34.9, 8.1 and 1.9-fold enhancements compared with those of Bi 2 S 3 , In 2 S 3 , and the Bi 2 S 3 @In 2 S 3 heterostructure with poor sulfur vacancies, respectively. For simultaneous Cr(VI) reduction and antibiotic (tetracycline and ciprofloxacin) degradation under visible light, the excellent Cr(VI) reduction performance was kept and the degradation rates of the antibiotics clearly increased (more than 25%) compared with those of the reactions in the corresponding solo system, which was due to the synergistic effect of efficient utilization of photoinduced electrons and holes. This article provides valuable insight and guidance for the design of defective heterostructures and the treatment of complex water pollutants.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Jinfeng Mei,Hui Zhang,Siqi Mo,Yuzhe Zhang,Zhongyu Li,Hongxiang Ou
Low-density aerogels with three–dimensional porous structure were synthesized using soluble chitosan oligosaccharide (COS) and graphene oxide (GO) as raw materials under mild conditions. Tetraethylenepentamine was used as the crosslinker of COS and the bridge between GO and COS, as well as the provider of functional groups. Structural characterizations revealed that crosslinked COS polymers firmly fixed on the surfaces of GO sheets and abundant amino groups homogeneously distributed in the pores. The adsorption capacity of the aerogel for Cr(VI) can reach up to 519.8 mg/g, while the adsorption efficiency for trace Cr(VI) adsorption can also reach 100% especially. The adsorption mechanism was investigated with X–ray photoelectron spectroscopy and zeta potential analysis. The superb properties suggested that the strategy of using COS as a raw material for the fabrication of adsorbents with controllable structure and form is meaningful.
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PubMed
高影响因子
Algal Research-Biomass Biofuels and Bioproducts
·
2024
·
IF 4.6
Shuo Shang,Wenlu Che,Yanpeng Li
Two types of biochar adsorbents, ZnCl₂-modified biochar (ZABC-5 and ZLBC) and H₃PO₄-modified biochar (HABC-5), were synthesized using algae powder and lake bloom algae. ZnCl 2 as activator can change the surface structure of algal biochar and increase the adsorption site. ZABC-5 exhibited superior adsorption efficiency, achieving a maximum removal rate of 98.68 % for Cr(VI), featuring a defined surface area of 34.58 m 2 ·g −1 . Furthermore, it demonstrated excellent regeneration performance, maintaining over 98 % removal rate for Cr(VI) after three cycles using HCl as the desorbing agent. The multifaceted adsorption mechanism of Cr(VI) removal by ZABC-5 encompassed pore filling, electrostatic interaction, redox reactions, surface complexation, and ion exchange. Response surface optimization determined the optimal adsorption conditions for ZLBC, yielding an actual removal rate of 76 ± 4 %. Life cycle assessment revealed that the production of 1kg ZLBC and its utilization significantly reduce environmental impact, and the global warming potential is 12.70 kg CO 2 -Eq, while remaining cost-effective. Overall, this work provides a precedent by using lake bloom algae to create biochar adsorbents, showcasing the effectiveness and sustainability of algal biochar for removing Cr(VI) from water bodies and aiding environmental remediation.
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ACS Applied Optical Materials
·
2024
·
IF 0
Yonghang Li,Yang Lu,Haonan Ju,Wei Wang,Dong Tu,Hongyu Lu,Jiayu Wang,Hua Zou
Near-infared phosphor-converted light-emitting diodes (NIR pc-LEDs) are next-generation NIR light sources due to their long life, low cost, and compactness. Unfortunately, there is a lack of efficient NIR-II phosphors with high efficiency and large full width at half-maximum (fwhm) that can be excited by violet LED. Here, a series of Cr3+/Ni2+-codoped LiAlSiO4 with unprecedented emission peaking at 1150 nm (∼1000–1400 nm, fwmh ∼191 nm) were synthesized via a solid-state reaction. More importantly, the phosphors exhibit high efficiency and excellent thermal stability under violet emission excitation. Moreover, the NIR pc-LED devices as a NIR-II light source have been fabricated through a combination violet LED and optimized LiAlSiO4:Cr3+/Ni2+ phosphors, which are well applied to high-penetration imaging and nondestructive fruit damage inspection. These results indicate that the LiAlSiO4:Cr3+/Ni2+ phosphors have great potential applications as NIR light sources.
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IEEE ELECTRON DEVICE LETTERS
·
2023
·Vol. 44
·期 7
·1152-1155
·
IF 4.9
Weishuai Duan,Zhe Liu,Xinfa Zhu,Biao He,Chao Fan,Yonghui Zhang,Mengjun Wang,Hongxing Zheng,Erping Li
Near-ultraviolet (NUV) detectors based on two-dimensional (2D) materials have garnered considerable attention owing to their atomic-scale thickness, varied bandgap, and strong interaction with incident light. In this work, homostructures composed of tin disulfide/chromium–doped tin disulfide (SnS
2
/Cr–SnS
2
) were proposed for 405 nm near-ultraviolet detectors. Afterward, superlative detectors were fabricated through the employment of micro-mechanical exfoliation and polydimethylsiloxane-assisted dry-transfer methods, anchored by the SnS
2
Cr–SnS
2
homostructures. The detectors demonstrated exceptional detection performance for 405 nm NUV radiation with a significant responsivity of
$2.04\times 10^{{3}}\,\,\text {A}\cdot \text {W}^{-{1}}$
and a short response time of 8 ms, exceeding that of detectors based on most 2D materials and even commercial light detectors (Thorlabs FD11A–Si). The work presents an effective homostructure for high-performance SnS
2
-based detectors, thereby opening an opportunity for the utilization of SnS
2
in NUV detectors.
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Water
·
2017
·Vol. 9
·期 12
·979
·
IF 1.832
Junxian Shi,Wenyan Zhao,Chang Liu,Tao Jiang,Hongrui Ding
Here we reported the investigation of enhanced performance for the removal of hexavalent chromium (Cr (VI)) by a new microbial fuel cell (MFC) with natural pyrrhotite-coated cathode. By comparisons of the graphite-cathode, the MFCs equipped with a pyrrhotite-coated cathode generated the maximum power density of 45.4 mW·m−2that was 1.3 times higher than that of with bare graphite cathode (35.5 mW·m−2). Moreover, the Cr (VI) removal efficiency of 97.5% achieved after 4.5 h compared with only 46.1% by graphite cathode MFC. In addition, Cr (VI) removal rate with different initial Cr (VI) concentrations for 10 mg/L and 30 mg/L was investigated and a decreased removal percentage with increasing Cr (VI) concentration was observed. Batches of experiments of different pH values from 3.0 to 9.0 in catholyte were carried out to optimize system performance. The complete Cr (VI) removal was achieved at pH 3.0 and 99.59% of Cr (VI) was removed after 10.5 h, which met the requirement of the Cr (VI) National Emission Standard. When the value of pH was decreasing, the removal rate was obviously increased and Cr (VI) could be removed successfully with a broad pH range indicating pyrrhotite-coated cathode MFC had more extensive usage scope. Furthermore, cathode treatment products were studied by X-ray photoelectron spectroscopy (XPS), Cr2O3, Cr (III)-acetate were detected on the cathode by the XPS Cr2p spectra and no Cr (VI) founded, indicating that the Cr on the surface of cathode was Cr (III) and Cr (VI) were reduced. On cathode, pyrrhotite not only played a significant role for catalyst of MFCs, but also acted as reactive sites for Cr (VI) reduction. Our research demonstrated that pyrrhotite, an earth-abundant and low-cost natural mineral was promised as an effective cathode material. Which had great potential applications in MFCs for reduction of wastewater containing heavy metals and other environmental contaminants in the future.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhaoyang Li,Yongjie Zhao,Qing Guan,Qian Liu,Sara Khan,Leilei Zhang,Xianze Wang,Lei Chen,Xia Yang,Mingxin Huo
Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe 2 O 4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe 2 O 4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.
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