SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Wangyao Zhang,Yang Yang,Fenfen Li,Guosheng Song,Yong Shao,Ruizhuo Ouyang,Lina Xu,Weiwei Li,Yuqing Miao
A simple one-step method was successfully developed to prepare stable nanosized Ni(OH) 2 @Cr(OH) 3 hybrid particles by just adding NaOH to a mix solution containing Ni(NO 3 ) 2 and Cr(NO 3 ) 3 at room temperature. In contrast, under the exact same conditions, flocculent Ni(OH) 2 or Cr(OH) 3 precipitate was obtained after the addition of equivalent NaOH in a solution containing same amount of Ni(NO 3 ) 2 or Cr(NO 3 ) 3 as in the mix solution. The interaction between Ni(II) and Cr(III) ions was believed to make major contribution to the formation of stable Ni(OH) 2 @Cr(OH) 3 nanohybrid without aggregation to large-size particles. The prepared Ni(OH) 2 @Cr(OH) 3 hybrid nanoparticles were well characterized by the scanning electron microscopy (SEM), the transmission electron microscopy (TEM), X-ray diffraction (XRD), and electrochemical measurements with results showing uniform size, smooth surface, good monodispersibility, fast electron transfer rate as well as promising electrocatalytic properties toward glucose (Glu) and cysteine (Cys) oxidation. The presence of a small amount of Cr(OH) 3 in the composite not only improved the stability and monodispersibility of the Ni(OH) 2 @Cr(OH) 3 hybrid particles, decreased their size to nanoscale, but also exerted positive effect to the electrochemical properties of the obtained Ni(OH) 2 based nanomaterials like the electron transfer rate and the electrocatalytic activity. Satisfactory electrocatalytic performances of the Ni(OH) 2 @Cr(OH) 3 nanohybrid toward Glu and Cys oxidations were achieved, respectively, in certain concentration ranges with acceptable detection limits and correlation coefficients, suggesting the potential facilitation of electrocatalysis toward other small molecules by the newly prepared Ni(OH) 2 @Cr(OH) 3 nanohybrid.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6586-6591
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IF 7.443
Hongfei Shi,Huaqiao Tan,Wan-bin Zhu,Zaicheng Sun,Yuejia Ma,Enbo Wang
A series of Cr-doped Bi4Ti3O12/Bi2Ti2O7 (BTO) heterostructure fibers have been synthesized via a one-step, facile and economical electrospinning/calcination process. SEM and TEM results reveal that the diameters of the as-prepared fibers are 100 ± 30 nm. The light adsorption of Bi4Ti3O12 and Bi2Ti2O7 in the fibers has been remarkably improved by Cr doping. With increased Cr doping, XRD and XPS show that the amount of Bi2Ti2O7 increases in the fibers. As a result, the Bi4Ti3O12/Bi2Ti2O7 heterojunction structure is enhanced, which further promotes the charge separation of photogenerated charge carriers. Photocatalytic tests indicated that the as-prepared Cr-doped Bi4Ti3O12/Bi2Ti2O7 fibers exhibit good photocatalytic activity for photodegradation of methyl orange (MO) under visible-light irradiation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2015
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IF 2.729
Xiuli Song,Tailai Yang,Haiyan Du,Wenyan Dong,Zhenhai Liang
Transition metal mixed oxides of Mn and Cr with the nominal compositional formula Mn x Cr 1 − x O 1.5 ( x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were obtained by the thermal decomposition method. The powders were analyzed by SEM (scanning electron microscopy), XRD (X-ray diffraction) and XPS (X-ray photoelectron spectroscopy). The electrochemical properties of the Mn x Cr 1 − x O 1.5 electrodes for the OER (oxygen evolution reaction) in alkaline solution were evaluated by LSV (linear sweep voltammetry), staircase voltammetry and chronoamperometry . The results indicated that the mixed oxides were solid solutions of Mn 2 O 3 (bixbyite) and Cr 2 O 3 (eskolaite), and when x = 0.2, the catalyst had better catalytic activity in the OER process than did that of single Mn 2 O 3 and Cr 2 O 3 . At the high potential region (1.0 V vs Ag/AgCl), the current density of the Mn 0.2 Cr 0.8 O 1.5 electrode was ~ 80 times higher than that of Mn 2 O 3 and ~ 9 times higher than Cr 2 O 3 , and its overpotential ( η = 367.3 mV at a current density of 1.0 mA·cm − 2 ) was considerably lower than that of single Mn 2 O 3 ( η = 996.5 mV) and Cr 2 O 3 ( η = 648.5 mV) catalysts and was comparable to the precious metal oxide IrO x . The stability testing indicated that the mixed oxides had good stabilities in strong alkaline solution during the OER process.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shaoan Cheng,Yangxi Li,Zhen Yu,Yuqing Su
Adsorption can be used as a pollutant removal method to solve the increasingly serious problem of synthetic dye pollution and metal organic framework (MOF) is considered as a novel adsorbent for its unique structure. However, the high cost and high toxicity during the synthesis procedure of MOFs like MIL-101(Cr) limited their potential on the large-scale production and application. In this paper, waste PET plastic was depolymerized to prepare terephthalic acid (TPA) as an organic linker to synthesize MIL-101(Cr). Besides, Hydrofluoric acid (HF) was not added during the synthesis to avoid poisonous pollution. MIL-101(Cr) was applied to the adsorption of anionic dyes reactive red 2 (RR2) and reactive blue 19 (RB19). The batch experiments exhibited kinetic data best fitted the pseudo-first-order model (PFO) with the adsorption capacity of 662.87 (RR2) and 863.67 mg g -1 (RB19). The isotherm adsorption data fitted well with the Freundlich isotherm, indicating formation of multilayer coverage over the surface of MIL-101(Cr). The highest regeneration rate of MIL-101(Cr) at the fourth cycle was 91.18 and 91.44 % after RR2 and RB19 adsorption. X-ray photoelectron spectroscopy (XPS) technique and Fourier Transform Infrared (FTIR) spectroscopy both indicated the possible adsorption mechanism of MIL-101(Cr) toward RR2 and RB19 could be attributed to electrostatic interactions, hydrogen bonding, and the π-π stacking. This work proposed a novel method using waste plastics as raw materials to synthesize eco-friendly pollutant adsorbent, which had an enlightening effect on pollutant treatment.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jiaqi Ma,Linkun Fan,Xusheng Wang,Lan Li,Yiming Zhang,Guixia Zhao,Bo Chai,Junkuo Gao
Cr(VI) stands as a profoundly toxic chemical and photocatalysis technology has shown promising potential in photocatalytic reduction of Cr(VI) to Cr(III), where the reduced Cr(III) is less toxic and can be further precipitated in a wide pH range. Metal-organic frameworks (MOFs), as emerging class of porous coordination polymers, is expected to be ideal platform for photocatalysis. In this study, defect engineering on MOFs was applied to promote photoreduction of Cr(VI). The obtained oxygen vacancy-containing MIL-125-NH 2 samples showed modified electron structure, adjusted surface and porous properties, and enriched active sites. Among these oxygen vacancy-containing MIL-125-NH 2 samples, the 300-M (MIL-125-NH 2 heated at 300 °C for 2 h under N 2 atmosphere) displayed the most remarkable performance in terms of photocatalytic Cr(VI) reduction. The pronounced efficacy of 300-M is evident from the achieved removal rate of Cr (VI), reaching an impressive 98 % in just 20 mins (19.6 mg Cr(VI) g −1 cata min −1 ), in stark contrast to MIL-125-NH 2 , which exhibited a modest removal rate of 53 %. Remarkably, the k-value for 300-M is 5.1 times that of MIL-125-NH 2 , further underscoring the superior efficiency of 300-M. The photoreduction mechanism of 300-M was further substantiated through a battery of advanced characterization techniques including transient photocurrent, electrochemical impedance spectroscopy, fluorescence spectroscopy, the Mott-Schottky analysis, and electron spin resonance. Those results disclosed that oxygen vacancies and mesopores introduced via controlled heat treatment play a pivotal role in facilitating the photoreduction of Cr(VI) within the MIL-125-NH 2 structure. More advanced characterizations for the structures of photocatalysts and the photocatalytic mechanisms including charge transfer path need further studied. The systematic exploration of temperature-dependent effects on material properties opens avenues for future research in designing efficient and versatile MOF-based photocatalysts for environmental remediation applications.
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Journal of Environmental Sciences
·
2025
·
IF 6.3
Yuanyuan Wang,Shijun Jia,Shiqiang Ding,Wenyan Zhang,Rui Shu,Yingfei Hu
Using natural minerals to eliminate harmful Cr(VI) under sustainable sunshine has significant potential. Herein, Palygorskite nanorods were utilized as carriers for the in-situ synthesis of CaIn 2 S 4 photocatalysts through a simple one-pot thermal process, enabling the efficient reduction of Cr(VI). With a Palygorskite to CaIn 2 S 4 mass ratio of 5 %, the conversion rate of Cr(VI) reached 98 % after 60 minutes of visible-light exposure, with a remarkable reaction rate of 0.0633 min −1 . The effective integration of CaIn 2 S 4 with Palygorskite led to a more uniform dispersion of CaIn 2 S 4 , exposing more reactive sites. Moreover, the establishment of a heterojunction between CaIn 2 S 4 and Palygorskite facilitated the transport of photogenerated electrons from CaIn 2 S 4 , enhancing the efficiency of charge separation. These factors contribute to the improved photocatalytic performance. Additionally, the developed composite photocatalysts demonstrated excellent stability under light exposure and could be reused efficiently. Trapping tests on active substances revealed that e − played key roles in the Cr(VI) reduction. This research suggests the potential of using natural minerals to fabricate composite photocatalysts capable of effectively removing pollutants from the environment using solar energy.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Yunqi Zhou,Ye Yuan,Xinlei Liu,Zhi Wang
Metal-organic framework (MOF) membranes with proper pore size distribution and functional groups are generally more suitable for separation. Most MOFs are characterized by a hierarchical pore structure, which possesses large cavities surrounded by small windows. Fabrication of MOF membranes only retaining microporous fragment structure is a workable method to narrow pore size distribution. In this study, well-grown NH 2 -MIL-101(Cr) fragment membranes were fabricated for CO 2 separation by adjusting acetic acid – ligand – metal ratio to balance the nucleation and growth. NH 2 -MIL-101(Cr) fragment has a similar chemical structure to NH 2 -MIL-101(Cr) as expected, but only small pores with size around 0.56 nm is retained. The NH 2 -MIL-101(Cr) fragment membranes exhibited CO 2 /N 2 selectivity of about 37 with CO 2 permeance up to 6104 GPU.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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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).
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Surfaces and Interfaces
·
2025
·
IF 6.3
Jun Hua,Xianwen Wu,Fangxi Xie,Mingmei Wu
Manganese-based aqueous zinc-ion batteries are considered to be one of the most promising candidates owing to its abundant resources, environmental friendliness and high safety. However, some severe problems associated with cathode are mainly plagued by Mn (III) disproportionation and Jahn-Teller distortion, leading to undesired manganese dissolution and reduced their cycle life. Herein, Cr-doped δ-MnO 2 is synthesized by a simple hydrothermal method. This study demonstrates how Cr-doping addresses these challenges by narrowing the lattice spacing between MnO 2 layers, promoting self-confinement, and mitigating Mn 2+ dissolution. As a result, Cr-doped δ-MnO 2 exhibits enhanced crystal structure stability, with superior capacity retention of 65.80 % compared to 51.53 % for pristine δ-MnO 2 after 300 cycles at 500 mA/g. Our findings provide an alternative avenue for mitigating Mn dissolution, laying the groundwork for the adoption of Zn/MnO 2 batteries.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·848
·
IF 4.4
Jun Wu,Gaofeng Shao,Xiaodong Wu,Sheng Cui,Xiaodong Shen
A novel Cr-doped BaTiO3aerogel was successfully synthesized using a co-gelation technique that involves two metallic alkoxides and a supercritical drying method. This freshly prepared aerogel has a high specific surface area of over 100 m2/g and exhibits improved responsiveness to the simulated sunlight spectrum. Methyl orange (MO) was chosen as the simulated pollutant, and the results reveal that the Cr-doped BaTiO3aerogel, when modified with the noble metal silver (Ag), achieves a pollutant removal rate approximately 3.2 times higher than that of the commercially available P25, reaching up to 92% within 60 min. The excellent photocatalytic performance of the Ag-modified Cr-doped BaTiO3aerogel can be primarily attributed to its extensive specific surface area and three-dimensional porous architecture. Furthermore, the incorporation of Ag nanoparticles effectively suppresses the recombination of photo-generated electrons and holes. Stability and reusability tests have confirmed the reliability of the Ag-modified Cr-doped BaTiO3aerogel. Therefore, this material emerges as a highly promising candidate for the treatment of textile wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weifang Zhang,Lianyang Huang,LingLing Zhuang,Jiahong Pan,Kun Li,Yu Luo,Chunshan Wu,Menglu Zhang,Chunli Wang
While mechanochemical reactions have garnered attention for their broad applicability and readily attainable operational conditions, their utilization in wastewater purification, particularly for the treatment of chromium-containing effluents, remains limited. In this study, we present a novel mechanism for ball milling-mediated reduction and immobilization of hexavalent chromium, achieving removal efficiencies of up to 93.7% over a pH range of 2.0 to 10.0. This mechanism advocates for the concurrent effect of mechanical force to facilitate the reduction of Cr(VI) to its stable surface form (Cr(III)), and the precipitation of BaCrO 4 , thereby immobilizing the chromium species. Density functional theory calculations demonstrate that oxygen vacancies can efficiently adsorb Cr(VI), thereby imparting electrons to it, consequently facilitating reduction processes. This study provides novel insights into metal ion-contaminated wastewater treatment and the role of naturally generated mechanical forces on the redox processes of chromium species.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Zhichang Ma,Jing Sun,Hemeiling Cai,Junwei Di
A photoelectrochemical (PEC) sensor based on a BiVO 4 semiconductor and gold nanoparticles (AuNPs) was successfully prepared for the sensitive detection of Cr(Ⅵ) ions. The calcination temperature was found to be very important for the PEC properties of BiVO 4 . The BiVO 4 -modified indium tin oxide electrode (ITO/BiVO 4 ) calcined at 300 °C generated a low cathodic photocurrent response under light irradiation. BiVO 4 /AuNPs materials were coupled via electrostatic adsorption to enhance the photoelectric conversion performance of BiVO 4 . The use of self-assembled monolayers (SAMs) to modify electrodes reduce the background current. The developed ITO/BiVO 4 /AuNPs/L-Cys PEC sensor was used to detect of Cr(VI). The Cr(Ⅵ) ion concentrations showed a good linearity between 10 pM and 1 μM with a detection limit of 9.1 pM (S/N = 3). The prepared PEC sensor exhibited high sensitivity, a wide linear range, and good selectivity. This work provides a promising platform for the analytical detection of heavy metal ions.
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