INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Fuhua Wei,Fang Lan,Qinhui Ren,Hongliang Chen,Yutao Zhang,Zhao Liang
The Y/Cr-MOFs were synthesized via solvothermal treatment using 1, 3, 5-benzoic acid as the organic ligand and yttrium acetate hydrate and chromium acetate as the metal ions. The structures of the prepared Y/Cr-MOFs were characterized using FT-IR, XRD, TG, and SEM techniques. These characterized Y/Cr-MOFs were employed to investigate the adsorption efficiency of minocycline. Experimental findings indicate that minocycline adsorption by Y/Cr-MOFs follows both the second-order kinetic model and Freundlich isotherm. Within a span of 5 h, up to 90.4 % of minocycline can be adsorbed by Y/Cr-MOFs at pH 6. Moreover, a maximum removal capacity of minocycline reaching 506 mg/g was achieved with Y/Cr-MOFs. These results demonstrate the practical application potential of utilizing Y/Cr-MOFs for efficient minocycline adsorption.
研究领域:
环境科学
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材料科学
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药物化学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Z.H.A.O.-X.U.A.N. Jiang
In this investigation, UiO-66-NH 2 was effectively synthesized through a solvothermal approach, utilizing benzoic acid and hydrochloric acid (HCl) as modulating agents. This synthesis process intentionally introduced defects mediated by benzoic acid, and the degree of these defects was precisely adjusted by the concentration of HCl. Subsequently, the material underwent a covalent modification process through an amidation reaction, resulting in the attachment of tetrakis (4-carboxyphenyl) porphyrin (TCPP). The results demonstrated a significant improvement in the photocatalytic reduction of Cr(VI), showcasing a 125 % elevation in reduction efficiency as compared to the unmodified UiO-66-NH 2 material serving as the baseline. The performance enhancement is due to the synergistic effect of the defect structure and TCPP modification, which enhances the light absorption, promotes charge transfer and separation, reduces the recombination rate, and improves the adsorption capacity and light absorption efficiency of Cr(VI). This research introduces an innovative approach and a highly effective catalyst, offering a novel solution for modifying metal-organic frameworks (MOFs) and enhancing their photocatalytic performance in the reduction of Cr(VI).
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Aiqun Kong,Yawei Sun,Mao Peng,Hongzhi Gu,Yan Fu,Jinli Zhang,Wei Li
Amino-functionalized MXenes (NH 2 -Ti 3 C 2 T x ) were constructed with the feature of strong adsorption but also reduction ability for Cr(VI) ions in aqueous solution, via in situ polymerization of (3-aminopropyl)triethoxysilane (APTES) onto the surface of multilayer Ti 3 C 2 T x . Amino groups and Ti 3 C 2 T x nanosheets exhibit synergistic effects in the adsorption and reduction of Cr(VI) anions. The maximum adsorption capacities for Cr(VI) onto NH 2 -Ti 3 C 2 T x -0.5 calculated by Langmuir model are 107.4 mg/g. Meanwhile, Ti(Ⅱ) species and -NH 3 + are individually oxidized into Ti(Ⅳ) species and NO 3 − during the removal of Cr(VI). The NH 2 -Ti 3 C 2 T x -0.5 nanosheets exhibit high selectivity and reusability for Cr(VI) removal. Density functional theory calculations illustrate that the synergy between Ti and N remarkably boost the binding energy of MXene toward Cr(VI) along with the electron density on MXene surface. This work provides deep insights into functionalized MXene nanosheets in the fields of heavy metal remediation.
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 Cleaner Production
·
2019
·
IF 6.395
Song Gao,Qinze Liu,Qiang Liu,Chengbing Yuan,Tingting Gao,Jinshui Yao
In this work, hollow globular Cr(VI)-adsorbents were successively fabricated via the assembly of tannic acid (TA) and 1, 6-hexanediamine (HA) converting to polymerization using polyvinyl alcohol (PVA) as precursor. PVA@poly(tannic acid - 1, 6-hexanediamine) (PVA@PTHA) with hollow structure can chelate Cr on their bodies accompanying of reduction of Cr(VI) to Cr(III) caused by phenolic hydroxyl groups, which is proved by means of TEM , XPS , SEM and EDX, etc . Many factors affecting the adsorption of Cr(VI) were studied systematically, i.e. , initial Cr(VI) concentration (20–260 mg/L), contact time (0–48 h), foreign ions (Cu 2+ , Fe 3+ , Mn 2+ ), and pH value (2–7). The adsorption-reduction process followed the Langmuir isotherm model (R 2 = 0.9994) and fitted well with the pseudo-second-order kinetic model (R 2 = 0.9984). Besides, the removal capabilities of PVA@PTHA for Cr(VI) were affected insignificantly by nitrate ion (NO 3 − ) or sulfate ion (SO 4 2− ) as a competitive ion. In brief, PVA@PTHA is low-cost green adsorbent with the maximum adsorption capacity of 434.0 mg/g for Cr(VI)-sewage treatment.
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
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Lanlan Li,Xiaoyu Dong,Jihong Chen,Jing Xiao,Li Zeng,Zhengwen Huang,Zhirong Zou
A rapid and easy-used colorimetric method was developed for on-site and rapid analysis of Cr(VI). Under acidic condition, Cr(VI) was reacted with 1, 5-diphenylcarbazide (DPC) and a purple-red complex was formed subsequently, inducing the color changed from colorless to purple-red, this color variance can be detected by ultraviolet–visible spectrophotometer (UV–Vis), smartphone and even naked-eye. For realizing the goal of on-site analysis, this method was integrated in a three dimensional (3D) printed analytical kit, smartphone was used as a portable detector. Under the optimized conditions, limit of detections (LODs) of 0.0014 μg/mL and 0.0016 μg/mL were obtained by smartphone and UV–Vis, respectively. Concentration of Cr(VI) as low as 0.05 μg/mL was still visible by naked-eye. This colorimetric system was further applied to the analysis of several environmental water samples, recoveries of 90–107 % were obtained. It is a promising portable analytical device/system for Cr(VI) on-site and rapid analysis.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2072
·
IF 5.3
Xu Zhang,Bo Tian,Zhiheng Ma,He Wang,Zhixuan Cheng,Jiaqiang Xu
As a volatile air pollutant, formaldehyde can enter people’s living environment through interior decoration, furniture and paint, causing serious harm to human health. Therefore, it is necessary to develop a sensor for the real-time detection of formaldehyde in low concentrations. According to the chemical interaction between amino groups and formaldehyde, a MIL-101(Cr) aminated-material-based formaldehyde cantilever sensor was prepared, of which ethylenediamine- functionalized MIL-101(Cr) named ED-MIL-101(Cr)) showed the best gas sensing performance. Using quasi-in situ infrared spectroscopy, ED-MIL-101(Cr) was found bound to formaldehyde through a Schiff base. The adsorption enthalpy of formaldehyde-bound ED-MIL-101(Cr) was −52.6 kJ/mol, which corresponds to weak chemical adsorption, so the material showed good selectivity. In addition, ED-MIL-101(Cr) has the most active sites, so its response value to formaldehyde is larger and it takes longer to reach saturation adsorption than bare MIL-101(Cr). Through the research on the gas sensing performance of functionalized MIL-101(Cr) material, we found that it has a strong application potential in the field of formaldehyde monitoring, and the material performance can be quantitatively and accurately evaluated through combining calculation and experimentation for understanding the gas sensing mechanism.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Shaojun Li,Xiaoxuan Fan,Zhongping Chen,Lei Bai
A nanosized zeolitic imidazolate framework-67 (ZIF-67) was employed for the adsorption of Cr(VI) under a neutral solution. It was discovered that the ZIF-67 demonstrated a high adsorption of Cr(VI) for the first (43.1 mg·g –1 ) and second run (40.2 mg·g –1 ). However, a self-sacrifice process of ZIF-67 was evidenced, possibly due to the oxidability of Cr(VI) and pH change, which resulted in a dramatically decrease of adsorption ability in the third run (16.6 mg·g –1 ). The adsorption process and its kinetics fitted the Langmuir model and pseudo-second-order rate equation and a multiple adsorption process was suggested.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yulong Xiang,Xinbin Ji,Xiaoli Dong,Yu Wang,Nan Zheng,Chundong Liu,Menglin Wang,Chumin Yan
Photoreduction of toxic Cr(VI) in wastewater to less toxic Cr(III) presents an effective approach to address the environmental issues. Nevertheless, the photocatalytic performance of these photocatalysts is severely constrained by their narrow light absorption range and the rapid recombination of photo-generated electrons and holes. Herein, DUT-67/Fe 2 O 3 heterojunction photocatalysts were prepared by a simple mechanical grinding method. The formation of DUT-67/Fe 2 O 3 heterostructures not only increased the specific surface area and light absorption range, but also improved the separation of photogenerated charge carriers. Compared to the pristine DUT-67, DUT-67/Fe 2 O 3 exhibited significantly improved photocatalytic performance in the reduction of Cr(VI), achieving a reduction efficiency of up to 94 % within 40 min. Active species trapping experiments identified that electrons served as the primary species in the photocatalytic process. Coupled with electron spin resonance and density functional theory (DFT) calculations, a comprehensive mechanism for the photocatalytic reduction of Cr(VI) by DUT-67/Fe 2 O 3 Z-scheme heterojunction was proposed. This work offers new insights into the underlying mechanisms involving in the interfacial charge transfer and Cr(VI) photoreduction processes.
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
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xuanqi Hao,Xiao Zhang,Jianrong Wang,Chenchen Liu,Chuanhao Li,Ping Yang
To create fluorescent sensors for Cr (VI) and l-arginine detection, blue-emitting carbon dots (CDs, named as M-CDs) were prepared via a solvothermal synthesis by using m-phenylenediamine. The introduction of sulfuric acid changed the blue-emitting of CDs into green-emitting (named as S-CDs), in which the photoluminescence (PL) peak wavelengths of samples M-CDs and S-CDs were 450 and 540 nm, while their PL efficiencies were 21.7 and 84.2 % respectively. Sulfuric acid resulted in the average fluorescent lifetime of the CDs was prolonged into 8.19 from 4.65 ns. The photo and thermal stable tests demonstrated that theses CDs revealed excellent stability. Meanwhile, CDs flexible films with bright blue- and green-emitting were prepared utilizing the favorable solubility of CDs in polar solvents. Mono-dispersed CDs as luminescent materials demonstrated it promising prospects in luminescent devices field. Furthermore, M-CDs exhibited excellent selectivity towards Cr(VI) and l-arginine. The detected limit (0.86 μM for Cr(VI) and 0.43 μM for l-arginine) was determined by assessing the response of M-CDs to various concentrations of Cr(VI) ion and l-arginine solutions. These bright CDs revealed great potential for accurate detection of Cr(VI) and l-arginine.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 5
·1185-1196
·
IF 4.204
Liu Wanyue,Liu Xiaoqin,Chang Jinming,Jiang Feng,Pang Shishi,Gao Hejun,Liao Yunwen,Yu Sheng
The magnetic nitrogen-doped carbon (MNC) was prepared from polypyrrole by a simple high temperature calcination process in this paper. The structure and properties of MNC were analyzed by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, Brunner-Emmet-Teller, vibrating sample magnetometer, and X-ray photoelectron spectroscopy. The capacity of MNC to adsorb Cr(VI) and Pb(II) was evaluated. The effects of the initial pH, dosage, concentration and temperature on the adsorption capacity of MNC were measured. MNC had a large specific surface area and a special porous structure. Its nitrogen and carbon sources were rich, and the ratio of carbon to nitrogen was fixed. The maximum Cr(VI)-adsorption capacity and maximum Pb(II) adsorption capacity of MNC could reach 456.63 and 507.13 mg·g −1 at 318 K, respectively. The pseudo-second-order model was used to describe the adsorption kinetics of MNC, and the Freundlich model was employed to discuss its isotherms. The adsorption process was affected by the electrostatic force, the reducing reaction, pores and chelation. The results of this study suggest that MNC is a material with superior performance, and is very easily regenerated, reused, and separated in the adsorption process.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 18
·6271-6280
·
IF 6.119
Jiaqi Dong,Jianqiang Hu,Anyu Liu,Jiale He,Qingling Huang,Yanru Zeng,Wenjing Gao,Zhen Yang,Yongcai Zhang,Yong Zhou,Zhigang Zou
Direct Z-scheme MgIn2S4/Bi2WO6 hierarchical heterostructures were simply fabricated via immobilising MgIn2S4 nanoflakes onto the surface of Bi2WO6 hierarchical nanosheet-like structures towards photocatalytic reduction of Cr(VI). The analyses of the energy band structure, UPS tests and DMPO-ESR spin-trap experiments confirm that the intimate MgIn2S4/Bi2WO6 heterointerface allows an efficient Z-scheme interfacial charge migration route between MgIn2S4 and Bi2WO6, leading to higher redox ability of photoexcited carriers, and thus favours the separation of photoexcited carriers, proved by the results of PL spectroscopy, photoluminescence decay traces, transient photocurrent densities and EIS. In addition, the MgIn2S4/Bi2WO6 heterostructures also exhibit obviously enhanced ultraviolet-visible-light absorption according to UV-vis DRS analysis, and can generate more electron–hole pairs under UV-visible light illumination, effectively improving the photocatalytic activity. Therefore, because of their synergistic effects, all the MgIn2S4/Bi2WO6 hierarchical heterostructures show distinctly improved photoreduction activities for Cr(VI), compared with pure Bi2WO6. The optimal hybrid (MIS/BWO-0.35) displays nearly 100% Cr(VI) reduction into Cr(III) after 40 min of simulated sunlight illumination, which is better than the majority of the reported Bi2WO6 and other semiconductor photocatalysts before. Its reaction rate constant for the photoreduction of Cr(VI) (0.1063 min−1) is about 4.5 times higher than that of the pristine Bi2WO6 (0.0237 min−1). This work provides a valid approach for developing efficient Z-scheme photocatalytic materials in removing Cr(VI).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 16
·5763
·
IF 3.748
Minmin Zou,Hexin Zhu,Ming Dong,Tian Zhao
As one of the most important prototypical chromium-based MOFs, MIL-101(Cr) is well-studied and widely employed in various scientific fields. However, due to its small capture window sizes and curved internal apertures, its application in large molecular removal is quite limited, and given its high stability and high synthetic temperature (>200 °C), it is difficult to achieve hierarchically porous MIL-101(Cr). In our study, hierarchically porous MIL-101(Cr) involving a high macro-/meso-/micropores ratio was designed and synthesized using acetic acid as an additive and silicon dioxide (SiO2) nanoparticles as a template. The optimal hierarchically porous MIL-101(Cr) (A-4) possessed a high specific surface area (2693 m2g−1) and an abundant macro-/mesoporous structure with the addition of SiO2of 200 mg. Compared with the control sample (A-0) with a less macro-/mesoporous structure, A-4 showed good adsorption properties for both coomassie brilliant blue R-250 (CBB, 82.1 mg g−1) and methylene blue (MB, 34.3 mg g−1) dyes, which were 1.36 times and 9.37 times higher than those of A-0. Moreover, A-4 also had good recyclability, and the removal rate of CBB was still higher than 85% after five cycles of adsorption.Keywords:MIL-101(Cr);SiO2;dye adsorption;template
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）