RSC Advances
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2024
·Vol. 14
·期 38
·27514-27519
·
IF 3.9
Tian-Qi Zhao,Renagul Abdurahman,Xue-Bo Yin
MgGa2O4 (MGO) with the spinel structure exhibits abundance defects and could achieve the modulation of emission by ion doping as persistent luminescence nanoparticles (PLNPs). Here, we introduced Cr3+ ions into MGO to achieve near-infrared (NIR) emission, and Pr3+ ions to tune the lattice environment for enhanced NIR emission. The optimal composite, MgGa2O4: 0.005Cr3+, 0.003Pr3+ (MGCP), achieved enhanced NIR emission at 709 nm under 222 nm excitation. The concentration quenching was observed due to electric dipole–quadrupole interaction at high Cr3+ and Pr3+ content. The afterglow mechanism was revealed, while the energy-splitting occurs from trivalent Cr3+ ions at 650 and 709 nm, thanks to the complex lattice environment. We observed that the emission at 709 nm decreased, while the satellite signal at 650 nm increased first and then decreased intensity with increasing temperature, due to the intervalence charge transfer for Cr3+ ions at 303–528 K. Ratiometric temperature sensing was therefore realized with superb linearity, high absolute sensitivity at 303 K for 4.18%, and accuracy at 528 K for 2.62 K, confirming with the luminescence intensity ratio at 709 and 650 nm under excitation at 222 nm. Thus, we provide a method with energy-splitting emission of Cr3+ ions to design temperature sensing.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Meng Cheng,Yuqi Liu,Hao Jiang,Chunling Li,Shuangqing Sun,Songqing Hu
Adsorbents with fast kinetics and high capacity have always been attractive for wastewater treatment. Herein, multi-shelled hollow mesoporous organosilica functionalized by hydroxyphosphatoethyl groups on dual-pore surfaces (P-HMO) is prepared by general one-pot co-condensation. The resulting P-HMO exhibits high hydrophilicity, large surface area and well-developed pore structure, providing P-HMO fast adsorption kinetics (C 0 = 320 mg·L -1 , equilibrium within 5 min) and ultrahigh adsorption efficiency for Pb(II) and Cr(VI), the adsorption capacity reaches 1056.53 and 869.56 mg·g −1 , respectively. Furthermore, P-HMO displays outstanding reusability over 10 adsorption–desorption cycles thanks to the stable framework structure that can resist wear and tear during water treatment. The advantages of long service life, high efficiency and broad pH range make P-HMO promising in industrial water purification.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Qian Zuo,Bing Li,Zhiyi Deng,Xiangyu Zheng,Ping Li,Jinhua Wu
Zero-valent iron (Fe 0 ) is widely packed in filters for Cr(VI) removal, but it suffers from ferrochrome precipitate passivation. In this study, a mixed Fe 0 and biochar (BC) system was established and investigated for promoted Fe 0 corrosion and enhanced Cr(VI) removal through iron‑carbon micro-electrolysis (IC-ME) by batch and column experiments with Fe 0 and BC as controls. Due to electrochemical reaction between Fe 0 and BC, there was an enhancement in iron corrosion and subsequent formation of secondary minerals on Fe 0 surface. These minerals included magnetite, lepidocrocite, and goethite, which facilitated Cr(VI) adsorption and reduction. The Fe 0 -BC system therefore obtained a higher Cr(VI) removal rate of 86.3 % within 6 h than those of the BC (7.9 %) and Fe 0 (12.5 %) systems. Chromium species distribution showed that 76.2 % of removed Cr(VI) was converted to Cr(III). The resultant Cr(III) of 68.4 % was immobilized on Fe 0 and BC surfaces due to precipitation and sequestration. The optimal Fe/BC mass ratio was 2:1 for galvanic reaction and Cr(VI) removal. The removal of Cr(VI) by Fe 0 -BC exhibited a pH-dependency, with acidic conditions favoring higher removal rates. Additionally, the column experiment result revealed that Cr(VI) removal capacity of 4.0 mg Cr(VI)/(g Fe 0 ) and operational lifespan of 1851 PV in the Fe 0 -BC column were 6.7 and 3.9-fold greater than those in the Fe 0 column, further confirming that galvanic reaction could effectively alleviate Fe 0 surface passivation. These results indicated that mixed Fe 0 and BC as an effective medium in filter tanks could form IC-ME to enhance Cr(VI) reduction and immobilization during water treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Chong He,Zhiquan Yang,Jie Ding,Yuancai Chen,Xiaowen Tong,Ying Li
In this study, 3-aminopropyltriethoxysilane-functionalized graphene oxide (AS-GO) was synthesized by one-step refluxing of graphene oxide (GO) with 3-aminopropyltriethoxysilane (AS). The properties of GO and AS-GO were characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), atomic force microscopy (AFM), Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Specific surface area and Zeta potential. Various factors, such as solution pH, initial Cr(VI) concentration, contact time, temperature and coexisting anions, were analyzed during the adsorption process. The results showed that the Cr(VI) adsorption onto AS-GO was highly pH dependent, and the maximum adsorption capacity reached up to 215.2 mg/g at 328 K. Experimental data, obtained from adsorption kinetics and adsorption isotherms studies, could be well fitted by Langmuir adsorption isotherm and pseudo-second-order model. The XPS, FT-IR, and EDS analysis revealed that Cr(VI) removal might be attributed to the Cr(VI) adsorption on surface functional groups (protonated amine groups and Si OH groups) and the reduction of Cr(VI) to Cr(III). These results demonstrated that AS-GO could be a promising adsorbent for Cr (VI) removal from wastewater.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Sun Xiaoqin,Zhang Zehua,Yun Sining
Plasmonic-driven photocatalyst have outstanding solar driven surface plasmon resonance (SPR) characteristics, and it is a prospective approach to improve photocatalytic performance. Herein, plasmonic Co metal decorated SrTiO 3 : La/Cr hollow cubes was developed and constructed by template-free hydrothermal method. The photocatalyst possesses the merits of the hollow structure with large specific surface area and strong light absorption. The intimate contact between Co and SrTiO 3 : La/Cr promotes the interfacial charge transfer. Co-SrTiO 3 : La/Cr manifests the superior photocatalytic performance toward water splitting for hydrogen evolution compared with that of other cocatalyst. And the H 2 evolution exceeds 210 μmol·g −1 ·h −1 under the optimum of the amount of 1.25wt% Co NPs. The mechanism of the enhanced performance comes from the improvement of light absorption in the visible-light region induced by SPR, as well as the efficient interfacial separation and transport of charge carriers on the photocatalyst facilitated by the local electromagnetic fields of plasmonic Co metal. Graphical Abstract
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Zhiguo Wu,Dan Liu,Ying Deng,Runyi Pang,Jinjin Wang,Tian Qin,Zongzheng Yang,Rongliang Qiu
In this research, a new material, chitosan/polypyrrole (CS/PPy), was synthesized and linked with the Cr(VI)-reducing bacterial strain YL3 to treat Cr(VI)-polluted soil. The findings demonstrated that the synergistic application of strain YL3 and CS/PPy achieved the greatest reduction (99.6 %). During the remediation process, CS/PPy served as a mass-storage and sustained release agent in the soil, which initially decreased the toxic effects of high concentrations of Cr(VI) on strain YL3, thereby enhancing the Cr(VI) reduction efficiency of strain YL3. These combined effects significantly mitigated Cr(VI) stress in the soil and restored enzyme activities . Furthermore, wheat growth in the treated soil also significantly improved. High-throughput sequencing of the microorganisms in the treated soil revealed that CS/PPy was not only effective at removing Cr(VI) but also at preserving the original microbial diversity of the soil. This suggests that the combined treatment using strain YL3 and CS/PPy could rehabilitate Cr(VI)-contaminated soil, positioning CS/PPy as a promising composite material for future bioremediation efforts in Cr(VI)-contaminated soils.
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PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Xiaoli Ding,Qiankun Zhang,Hongyong Zhao,Qingping Xin,Yuzhong Zhang
Two series of mixed matrix membranes (MMMs) have been synthesized via in situ UV polymerization for the removal of N2 from CH4. MIL-100(Cr) particles activated at different temperatures were used as fillers. MIL-100(Cr) activated at 150°C with CH4-selective adsorption was incorporated with poly(ethylene oxide)-based polymer to improve the CH4/N2 separation performance, and that activated at 250°C with N2-selective adsorption and diffusion was incorporated with fluoropolymer to improve the N2/CH4 separation performance. The effects of the filler loadings on the gas permeation and separation performances were investigated. The optimum MMMs with 5 wt.% loading of MIL-100(Cr) activated at 150°C exhibited a 70% increased CH4/N2 permselectivity of 5.0 with a 37% increased CH4 permeability of 11.2 Barrer (tested at 0.2 MPa and 35°C). The optimum MMMs with 5 wt.% loading of MIL-100(Cr) activated at 250°C exhibited a 106% increased N2 permeability of 71.5 Barrer with an 89% increased N2/CH4 permselectivity of 1.9.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Danyan Lin,Xiujie Lin,Hao Li,Hongyuan Huang,Huan Yang,Jie Yang,Baowei Hu,Fengfeng Chen,Xinrong Guo,Xiangke Wang,Wen Yao
Herein, the ultrathin porous nitrogen-doped carbon nanosheet (uPNC-NS-800) catalyst was developed for efficient Cr(VI) reduction. Its versatile structures were obtained via thermal exfoliation of metal-organic frameworks with KCl. Impressively, uPNC-NS-800 achieved complete reduction of Cr(VI) to Cr(III) within only 6 min in oxalic acid (OA) aqueous solution, exhibiting significantly higher catalytic efficiency compared to PNC-NS-800, which lacks ultrathin structure. It also retained high catalytic activity after twelve cycles and exhibited excellent applicability, effectively removing Cr(VI) from various water environment within 30 min. Additionally, electron paramagnetic resonance spectroscopy indicated that uPNC-NS-800 promoted the generation of ·CO 2 − and ·OH radicals from OA, accelerating Cr(VI) reduction. Density functional theory calculations suggested that Defect C was the dominated active center and Pyridine N, Pyrrole N, and Graphite N were the synergistic active sites to together facilitate Cr(VI) reduction. This study provides a new insight into designing efficient carbon-based catalysts for real environmental wastewater remediation.
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VACUUM
·
2025
·
IF 3.9
Zhuo Li,Huiling Du,Nan Kong,Na Cao,Kemeng Hu,Lan Yang,Xian Du
Carbon dioxide conversion represents a highly promising carbon reduction strategy, and photocatalytic conversion technology, characterized by greenness, non-toxicity, and sustainability, holds significant importance. However, enhancing CO 2 adsorption on photocatalysts and improving charge carrier separation efficiency remain substantial challenges. In this study, based on MIL-101, we designed a highly interconnected TiO 2 @MIL-101 bifunctional heterojunction by in-situ compositing TiO 2 on its surface through Ti-O-Cr bonding, aiming to achieve in-situ adsorption and conversion of carbon dioxide. This composite photocatalyst exhibits enhanced photocatalytic activity, with an average CO production rate of 35.39 μmol h −1 g −1 and a CH 4 production rate of 13.81 μmol h −1 g −1 . Compared to unmodified MIL-101 (Cr), these values are increased by 1.25-fold and 2.8-fold, respectively. Experimental results combined with DFT calculations demonstrate that the porous structure and high specific surface area of MIL-101 facilitate the diffusion of CO 2 on the photocatalyst surface and improve interfacial reaction kinetics. The synergistic effect between Ti-O-Cr bonds and the built-in electric field within the highly interconnected heterojunction accelerates the directional transfer of charge carriers at the heterointerfaces, effectively promoting the catalytic conversion of carbon dioxide.
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Zhe Wang,Hongru Hao,Yushi Feng,Dmitry Sergeevich Tsvetkov,Zhe Lv,Lingling Xu,Bo Wei
The performance and stability of solid oxide fuel cell (SOFC) cathodes are severely limited by chromium poisoning. To address these concerns, we designed and investigated A-site two high-entropy perovskite oxides, which possess equivalent configuration entropy but distinct elemental compositions. Compared to the conventional double perovskite PrBaCo 2 O 5+δ (PBC), the PBSLSC cathode demonstrated superior oxygen reduction reaction activity, while PBSNGC showed inferior performance. Crucially, both high-entropy cathodes exhibited significantly enhanced resistance to chromium poisoning, as evidenced by the suppressed formation of SrCrO 4 and Co 3 O 4 secondary phases. This improved Cr-tolerance is due to high-entropy sluggish diffusion effect, which mitigates the segregation of Ba/Sr and cobalt elements. Our findings demonstrate that while configurational entropy is critical, the specific elemental composition is a decisive factor in determining cathode activity. This work establishes high-entropy engineering as a powerful strategy for developing highly active and Cr-tolerant cathodes for intermediate-temperature SOFCs.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-12
·
IF 2.8
Cai Hongxin,Yu Hang,Liu Yuanyuan,Yan Lingling,Chen Liang,Hu Qiang,Wang Lingli,Li Bin
A series of FeCl 3 doped MIL-101(Cr)/silicon nanoporous pillar array (FeCl 3 /MIL-101(Cr)/Si-NPA) humidity sensors were prepared by growing FeCl 3 doped MIL-101(Cr) on Si-NPA via a facile spin-coating method. Systematically evaluation of capacitive sensing performance demonstrated that FeCl 3 incorporation significantly enhanced humidity sensitivity. This improvement can be attributed to the increased hydrophilicity of the MIL-101(Cr)/Si-NPA composite membranes induced by FeCl 3 , as confirmed by the water contact angle test results. Notably, the 8 wt.% FeCl 3 /MIL-101(Cr)/Si-NPA humidity sensor exhibited the best comprehensive sensing properties, with excellent linearity (R 2 = 0.991) in the 11–75% relative humidity (RH) range. The capacitance of the humidity sensor increased by nearly three orders of magnitude from 11% RH to 75% RH at 300 Hz. Additionally, the humidity sensor displayed fast response (46 s) and recovery (6 s) times, as well as excellent reproducibility. The sensing mechanism was explored through the analysis of complex impedance curves. These finding indicate that the 8 wt.% FeCl 3 /MIL-101(Cr)/Si-NPA sensor holds considerable promise for humidity sensing applications.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 8
·4893-4902
·
IF 10.7
Zhao Sun,Yunhan Gong,Dongfang Cheng,Zhiqiang Sun
Catalytic methane decomposition shows the prominent superiority of generating hydrogen in one step with almost no carbon oxide production; however, it suffers from catalyst deactivation and low by-product carbon quality. Herein, a series of H2-reduced NixCr2Ox+3 (abbreviated as reduced NixCr2) catalysts were designed and synthesised for highly efficient methane decomposition and carbon nanotube production. A maximum methane conversion of 87.1% and hydrogen concentration of 91.8 vol% were achieved at 750 °C without deactivation. The results from XPS, XAS, and Raman reveal that the reduced NixCr2 catalysts have significant activity and stability. On the one hand, they form the Cr–O–Ni structure, thus possessing strong Ni–Cr2O3 interaction. On the other hand, the lattice oxygen of the reduced NixCr2 catalysts induces methane activation, thus accelerating methane activation, as demonstrated by the generation of a little amount of CO. In addition, the relationship between the types of carbon deposited and Ni/Cr ratio, decomposition temperature, and time was also revealed to guide carbon nanotube synthesis. Density functional theory calculation confirms the lowest dehydrogenation barrier of Ni(111)/Cr2O3(012), demonstrating the superiority of the Cr–O–Ni catalyzed methane decomposition. These findings provide innovative ideas for the construction of functionalized materials, which will substantially promote the development of methane decomposition.
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