JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Shaopeng Zhang,Jie Ding,Dayong Tian,Ruochen Lin,Weiming Wu,Chao Liu,Jiaohui Xia,Minghua Lu
Due to their carcinogenicity and persistence, water pollution of heavy metals, particularly chromium (VI), presents a key environmental problem. The attractive properties of a covalent organic framework make it a promising adsorbent for removing pollutants from water. Nevertheless, the lack of diversity and number of functional groups and the insufficient stability of the covalent organic skeleton limit its potential for adsorptive removal of specific metal ions, such as hexavalent chromium Cr(VI). A series of COFs@HPAN composed of protonated hypercrosslinking aniline polymer (HPAN) and COFs were synthesized via Friedel-Crafts reaction of dimethoxymethane with aniline in the presence of COFs. The modification with COFs not only provides HPAN with a higher specific surface area and improves its dispersibility, but it can also result in COFs@HPAN surface rich in functional groups. The structure of COFs@HPAN is verified by different characterization methods, such as FTIR, XRD, SEM, BET, and so on. 1610 cm -1 (-NH 2 ), 1657 cm -1 (C=N), 3388 cm -1 (N-H), and 2904 cm -1 (-CH 2 ) confirms the successful introduction of HPAN at COFs@HPAN. The XRD pattern of COFs@HPAN shows excellent crystal structure with distinct characteristic peaks at 21.1o and 26.8 o . The surface area, pore size, and pore volume of COFs@HPAN are 9.48 m 2 /g, 12.5 nm, and 0.04 cm 3 /g, respectively. SEM image shows COFs@HPAN contains numerous small pores, along with a high surface area and porosity, making it highly effective for Cr(VI) adsorption. The impact of time, initial pH, temperature, initial concentration, and ionic strength on Cr(VI) adsorption capacity was explored through batch tests. The adsorption is spontaneous and endothermic and follows Freundlich's isothermal adsorption and quasi-second-order model, suggesting chemisorption. At 318 K, the highest adsorption capacity of Cr(VI) was 412.26 mg/g. Additionally, COFs@HPAN has good anti-interference and reusability. Except for CO 3 2- , SO 4 2- , and PO 4 3- , the presence of coexisting anions did not significantly affect Cr(VI) adsorption, and the adsorption capacity remained well above 166 mg/g after 10 cycles. Electrostatic adsorption, chelation, and reduction are the predominant processes regulating Cr(VI) removal. XPS analysis demonstrated a nearly 77 % reduction of Cr(VI) to Cr(III) through electron transfer from the electron-donating functional groups such as -NH 2 . The results show that COFs@HPAN have good Cr(VI) adsorption capacity and can be used for the treatment of Cr(VI) in acidic wastewater.
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
·
2019
·
IF 7.65
Xiaoshu Lv,Xiaofeng Qin,Kaifeng Wang,Yiyin Peng,Peng Wang,Guangming Jiang
The scaled application of nanoscale zero-valent iron nanoparticles (nZVI or Fe° NPs) in environmental remediation is challenged by easy surface passivation and particle aggregation. To improve this situation and enhance their performance in Cr(VI) removal from water phase, we present one novel strategy to hybridize nZVI with layered double hydroxide (LDH) decorated reduced graphene oxide (rGO). The as-prepared ternary (Fe@LDH/rGO) composites possess better dispersibility, improved hydrophilicity and more positive surfaces that allows higher removal efficiency and capacity for Cr(VI) oxyanions. Composition proportion are optimized and influences of surroundings (solution pH, Cr(VI) concentration and temperature) are evaluated. Also, we demonstrate that Fe@LDH/rGO can be reused with suitable post-treatments, which combines alkaline solution desorption and NaBH 4 revivification possess. Cr desorption and Fe leaching ratio during regeneration should be critical indicators that determine the recovery efficiency. Synergistic effect within this ternary system not only contributes to its superiorities in stability, but also continuous iron corrosion via the formation of micro Fe-C batteries, where rGO acts as cathode and alternative electron conductor. The present work suggests great potentials of Fe@LDH/rGO composites in groundwater remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ming Ma,Jiale Zhang,Wenjun Zhang,Ying Gao,Dan Wang,Zihan Chen
Plants have a limited ability to absorb green light. Additionally, the energy distribution of sunlight in the deep-red region is weak. These factors restrict the efficiency of plant growth and limit yield improvements. In this study, a novel deep-red phosphor material, KAl₁₁O₁₇: Cr³⁺, was designed and synthesized through a high-temperature solid-state method. This material exhibits deep-red light emission at a central wavelength of 697 nm under broadband excitation at 430 nm (near-ultraviolet) and 562 nm (green light). By leveraging a "light-cutting" mechanism, the phosphor converts underutilized green light into far-red light, which strongly aligns with the absorption peak of the plant photoreceptor P FR state. When applied as a thin-film coating, the material significantly enhances lettuce growth under controlled green-light irradiation. These findings demonstrate the potential of KAl₁₁O₁₇: Cr³⁺ in optimizing spectral distribution for energy-efficient agricultural lighting systems.
研究领域:
植物科学
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材料科学
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光学工程
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农业科技
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光生物学
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2022
·Vol. 39
·期 1
·64-72
·
IF 2.172
Shaolin Tan,Yi Xin,Kun Liu,Enzhi Zhang,Shijie Li,Manqing Zhao,Huanfang Gao
In this article, low-molecular-weight organic acids were applied to remediate the hexavalent chromium [Cr(VI)]-contaminated soil. The influence of different parameters (washing concentration, solid–liquid ratio, time, and pH value) on the repair effect was explored, and the form distribution and desorption kinetic experiments of the soil were performed. The results show that the pH of eluents can significantly affect the form distribution of chromium, with the exchangeable form increasing considerably at a lower pH. The kinetics of Cr(VI) desorption can be described by the pseudo-second-order kinetics equation. The best washing scheme was determined to be the citric acid as the eluent at a concentration of 0.3 mol/L, a solid to liquid ratio of 1:10, pH 4, and a washing time of 6 h. The removal rate can be as high as 73.52%. After washing, the leaching concentration of Cr(VI) in the soil was reduced from 23.76 to 1.05 mg/L, well below the regulatory constraint of 5 mg/L. Additionally, the characterizations of X-ray diffractometer and scanning electron microscope showed little effect of adopting citric acid as a washing agent on soil structure and surface morphology. This study can provide a theoretical basis for the remediation of Cr(VI)-contaminated soil at industrial sites.
研究领域:
环境科学
·
土壤学
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DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 27
·期 3
·640-654
·
IF 1.993
Xiaoqi Liu,Yan Liu,Ting'an Zhang
This study aimed to prepare an efficient, cost-effective, and separable magnetic zeolite/chitosan composite (MZFA/CS) adsorbent from solid waste to deal with the water pollution of Cr(VI). The MZFA/CS was characterized by X-ray fluorescence (XRF), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and vibrating sample magnetometer (VSM) techniques. Then, the effect of pH, temperature, initial concentration of Cr(VI) ions, and contact time was considered in the study. For a sorbent dose of 0.1 g in 50 mL of a Cr(VI) solution, at a contact time of 30 min, temperature of 30°C, and a pH of 3, an adsorption capacity ( q e ) of 16.96 mg g −1 was achieved. Adsorption kinetics and isotherm data obtained for all adsorption systems were well-fitted by pseudo-second-order and Langmuir models, respectively. The thermodynamic study suggested that the adsorption process is spontaneous and endothermic in nature. In summary, the adsorbent with better separability ( Ms = 16.83 emu g −1 ) and adsorbability was successfully fabricated.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2025
·
IF 4.9
Nannan Huang,Shuhao Liang,Xiangyang Liang,Huining Chai,Yingjie Sun,Lili Lyu,Weiqiang Tan
The interfacial compatibility of heterojunction photocatalysts critically governs the interaction modes between constituent materials. Herein, a flower-like Bi-BDC-NH 2 /Ag 2 CO 3 heterostructure was fabricated via a simple ion-exchange solution method, serving as a robust photocatalyst for the efficient photocatalytic reduction of Cr(VI) in simulated wastewater under visible-light irradiation. Ag 2 CO 3 nanosheets were in-situ grown on the surface of three-dimensional Bi-BDC-NH 2 , forming an Ag 2 CO 3 -on-Bi-BDC-NH 2 type II heterojunction that establishes intimate interfacial contact, significantly accelerating the charge and mass transport dynamics. In comparison with pure Bi-BDC-NH 2 and Ag 2 CO 3 , the optimal Bi-BDC-NH 2 /Ag 2 CO 3 -50 (with a weight ratio of 0.5:1) exhibited dramatically enhanced photocatalytic activity, achieving 99% Cr(VI) reduction within 2 hours under visible light (>420 nm, 150 W xenon lamp). Mechanistic investigations, including energy band structure analysis, radical trapping experiments, and photoelectrochemical measurements, revealed that the heterojunction interface significantly promotes the separation and transfer of photogenerated electron-hole pairs. This work provides valuable insights into the rational design of MOF-based heterojunction photocatalysts and their applications in environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Hongxiang Chen,Zhilong Zhang,Xiaochun Wen,Ze Zhang,Fa Chang,Jianeng Huang,Yunfeng Su,Hengzhong Fan,Bing Xiao,Yongsheng Zhang
The discovery of out-of-plane ordered (o-MAX) phases has been largely confined to Al-containing systems, leaving a critical gap in understanding chemical ordering mechanisms across other A-element families. Meanwhile, the 413-type Ge-based MAX phases in bulk form are still lacking. Here, we report the first synthesis of bulk Ge-based 413-type MAX phases: Cr 2 Ti 2 GeC 3 , (Cr 1/3 Ti 1/3 Mo 1/3 ) 4 GeC 3 , and (CrTiVMo)GeC 3 , thereby expanding both structural complexity and chemical ordering paradigms in nanolaminate ceramics, and introducing the second series of o-MAX phases. Through combined Rietveld refinement and atomic-resolution elemental mapping, we demonstrate robust Ti-Cr out-of-plane chemical ordering in these phases, with Ti preferentially occupying the inner metal layers adjacent to Ge atoms and Cr populating the outer layers. This chemical ordering pattern is preserved even in quaternary metal compositions. In contrast, the introduced Mo and V are distributed almost randomly at both sites. First-principles calculations demonstrated the thermodynamic stability and electronic structure, and quantified the mechanical properties of Ge-based 413 phases, revealing enhanced mechanical moduli and tunable ductility through V/Mo incorporation. This work expands the o-MAX family beyond Al-based systems, establishing Ge-containing high- n phases as a platform for designing chemically ordered nanolaminates with tailored stiffness-ductility balance.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jianmei Li,Qi Sun,Tuyatsetseg Jambal,Dulguun Dorjgotov,Na Su,Qiuju Wu,Jirimutu
To identify adulterated camel meat in emerging markets, there is an urgent need for sensitive, rapid, and convenient detection methods. In this study, a novel fluorescent sensing platform was developed to effectively identify pork components adulterated in camel meat by regulating the surface charge properties of MIL-101(Cr). Our data demonstrated that the modification of polyethylenimine (PEI) had minimal impact on the crystal structure of MIL-101(Cr). However, it significantly affected the adsorption behavior of MIL-101(Cr) towards 6-carboxyfluorescein (FAM) labelled DNA, thereby influencing the response of fluorescence quenching-recovery. Under optimal conditions, the proposed turn-on fluorescent biosensor, based on PEI-MIL-101(Cr) exhibited high sensitivity with a detection limit of 42 pM. It also demonstrated excellent selectivity for specific target DNA, successfully detecting a pork fraction of 0.45 % (w/w) in camel meat. This study was aimed to provide a fresh perspective on the potential application of functional materials derived from metal-organic frameworks in detecting food adulteration .
研究领域:
食品安全
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生物传感
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材料科学
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jia Yang,Mingyan Fu,Mingdan Tan,Yanling Tian,Xiaorui Sun,Huisheng Huang
Herein, a 3.0%-Au/Sr0.70Ce0.20WO4 sample was prepared for the photocatalytic reduction of the Cr2O72– ion. The photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectra. The Sr0.70Ce0.20WO4 sample presented a photocatalytic reduction activity that is better than those of the Ce-doped sample and the intrinsic sample. Thereafter, different metal elements, Cu, Ag, Au, and Pt, were used as cocatalysts, which were loaded on the Sr0.70Ce0.20WO4 sample. The 3.0%-Au/Sr0.70Ce0.20WO4 photocatalyst showed optimal photocatalytic reduction activity in a 8 vol % methanol solution (pH = 7) under visible light irradiation. The kinetic constant of the optimal one is 0.0039 min–1, which is 1.86 times that of the Sr0.70Ce0.20WO4 sample. The photocatalyst is stable enough after a 24 h photocatalytic experiment.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chong Chen,Fengqing Wang,Qiuhao Li,Yunlong Wang,Jun Ma
A robust heterogeneous catalyst SIL-PW/MIL-101(Cr) for biodiesel production was fabricated via a bottom-up strategy using phosphotungstic acid (HPW) as a bridge to integrate SO 3 H-functionalized ionic liquid (SIL) with MIL-101(Cr). The characterization results indicated that HPW was well dispersed in the cavities of MIL-101(Cr). The subsequently introduced ionic liquid reacted with HPW to form heteropolyanion-based ionic liquid, which could be embedded in the mesoporous cages. These newly-developed SIL-PW/MIL-101(Cr) exhibited considerable catalytic activity, with 94.3 % conversion of oleic acid . The comparison experiments manifested the enhanced catalytic performance was attributed to the Brønsted acid sites originating from -SO 3 H groups together with the Lewis acid sites. Moreover, the mesoporous structure of MIL-101(Cr) remained intact during immobilization process, which was beneficial for diffusion of large-sized reactants. Due to the bridging function of HPW, no obvious leaching of active component during recycling was observed and the conversion maintained 91.8 % after reused for five times, displaying satisfactory reusability. This study could open new avenues for designing heterogeneous catalysts with multiple active sites through bridging strategy.
研究领域:
催化化学
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材料科学
·
能源化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 10
·2927-2935
·
IF 2.936
Ri Chol-Nam,Hwang Kuk-Jin,Kim Tu-Nam,Ro Yong-Hak,Ri Jong-Su
Herein, a novel ternary Bi/Bi 2 WO 6 /amorphous Bi 4 V 2 O 11 heterojunction photocatalyst was first synthesized via a facile one-pot solvothermal approach using ethylene glycol as a reaction medium. In this ternary heterojunction system, highly homogeneous-dispersed metal Bi and Bi 2 WO 6 nanoparticles were supported on amorphous Bi 4 V 2 O 11 flakes. Because of the Surface Plasmon Resonance (SPR) efficiency of metal Bi nanoparticles, as-fabricated Bi/Bi 2 WO 6 /amorphous Bi 4 V 2 O 11 heterojunction photocatalyst exhibited a strong light absorbance capacity in the visible-light and near-infrared light range, which can be verified by UV–vis diffuse reflectance spectra measurements. The Bi/Bi 2 WO 6 /amorphous Bi 4 V 2 O 11 heterojunction photocatalyst showed remarkably enhanced photocatalytic activity toward the photoreduction of heavy metal ion Cr(VI) and the photodegradation of MB under visible-light irradiation. The drastically enhanced photocatalytic activity in the ternary Bi/Bi 2 WO 6 /amorphous Bi 4 V 2 O 11 system could be attributed to the SPR effect of metal Bi and the promoted separation and transport efficiency of photo-induced charge carriers stemming from the construction of ternary heterojunction. Moreover, Bi/Bi 2 WO 6 /amorphous Bi 4 V 2 O 11 heterojunctions exhibited a good cycling stability for Cr(VI) reduction after 5 cycles. This study may be supply new insight into the fabrication of highly efficient and stable Bi 4 V 2 O 11 -based photocatalysts, and it is expected to have certain theoretical and experimental value in the design and exploitation of novel heterojunction photocatalyst. Graphical Abstract
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
DOI
高影响因子
Theranostics
·
2021
·
IF 11.556
Shaofang Zhang,Ying Liu,Si Sun,Junying Wang,Qifeng Li,Ruijuan Yan,Yalong Gao,Haile Liu,Shuangjie Liu,Wenting Hao,Haitao Dai,Changlong Liu,Yuanming Sun,Wei Long,Xiaoyu Mu,Xiao-Dong Zhang
Traumatic brain injury (TBI) is a sudden injury to the brain, accompanied by the production of large amounts of reactive oxygen and nitrogen species (RONS) and acute neuroinflammation responses. Although traditional pharmacotherapy can effectively decrease the immune response of neuron cells via scavenging free radicals, it always involves in short reaction time as well as rigorous clinical trial. Therefore, a noninvasive topical treatment method that effectively eliminates free radicals still needs further investigation. Methods: In this study, a type of catalytic patch based on nanozymes with the excellent multienzyme-like activity is designed for noninvasive treatment of TBI. The enzyme-like activity, free radical scavenging ability and therapeutic efficacy of the designed catalytic patch were assessed in vitro and in vivo . The structural composition was characterized by the X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy technology. Results: Herein, the prepared Cr-doped CeO 2 (Cr/CeO 2 ) nanozyme increases the reduced Ce 3+ states, resulting in its enzyme-like activity 3-5 times higher than undoped CeO 2 . Furthermore, Cr/CeO 2 nanozyme can improve the survival rate of LPS induced neuron cells via decreasing excessive RONS. The in vivo experiments show the Cr/CeO 2 nanozyme can promote wound healing and reduce neuroinflammation of mice following brain trauma. The catalytic patch based on nanozyme provides a noninvasive topical treatment route for TBI as well as other traumas diseases. Conclusions: The catalytic patch based on nanozyme provides a noninvasive topical treatment route for TBI as well as other traumas diseases.
研究领域:
神经科学
·
纳米技术
·
药理学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）