MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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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
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2025
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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
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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
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2024
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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
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2024
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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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Green Processing and Synthesis
·
2025
·Vol. 14
·期 1
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IF 3
Fuhua Wei,Yan Wang,Qinhui Ren,Qin Zhang,Hongliang Chen,Zhao Liang
Cr/Co-MOFs were synthesized via a solvothermal method using chromium acetate and cobalt chloride hexahydrate as metal ions, and trimeric acid as the organic ligand. The structures of Cr/Co-MOFs were characterized using Fourier infrared spectroscopy, X-ray diffraction, and scanning electron microscopy techniques. These Cr/Co-MOFs were used for removing organic contaminants in wastewater treatment. Fleroxacin and Rhodamine B (RhB) were specifically selected as target molecules in this study to evaluate the removal efficiency based on the mass of Co/Cr-MOFs, concentrations of organic contaminants, and adsorption time. Experimental findings indicated that at a Co/Cr-MOFs dosage of 100 mg, with initial concentrations of Fleroxacin (30 ppm) and RhB (20 ppm), removal efficiencies achieved were 95% and 99%, respectively. Within a timeframe of 5 h, Co/Cr-MOFs attained adsorption capacities amounting to 269.6 mg·g −1 for fleroxacin and 289.5 mg·g −1 for RhB. The interaction between Co/Cr-MOFs and fleroxacin, as well as RhB, is primarily attributed to factors such as pore size, hydrogen bonding, electrostatic charge, and π–π interactions. Moreover, theoretical analysis corroborated these experimental results by demonstrating conformity between the adsorption process and both second-order kinetic model equations alongside Langmuir isotherm model equations. Collectively, the experimental data combined with theoretical investigations underscore the practical significance associated with employing Co/Cr-MOFs for effective eradication of organic pollutants.
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Catalysts
·
2024
·Vol. 14
·期 5
·289
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IF 3.8
Sai An,Ying Wang,Huajian Qiao,Hao Xiu,Deyu Liu,Yongbo Kuang
Photoelectrocatalytic approaches show promise for contaminate removal in wastewater through redox reactions. However, the direct treatment of very low concentration heavy metals is a challenging task. Copper bismuth oxide is considered as a potential photocathode material due to its appropriate bandgap width and excellent light absorption properties. In this work, we utilize copper bismuth oxide photoelectrodes with micrometer-scale pores to achieve the efficient and complete reduction of micromolar-level hexavalent chromium(VI) in wastewater. In a continuous 180 min experiment, the reduction rate of 5 µM hexavalent chromium reached 97%, which is an order lower than the drinking standard. Such a process was facilitated by the unique hierarchical microstructure of the oxide thin film and the porous morphology. On the other hand, the structural evolution during the operation was analyzed. A surface passivation was observed, suggesting the possible long-term practical application of this material. This study serves as an important reference for the application of photoelectrocatalysis in addressing Cr(VI) pollution in wastewater, with implications for improving water quality and environmental protection.
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NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Ye Sun,Xinyan Sun,Jing-Mei Zhang,Li Shen,Yang Cui,Ziyin Han,Ran Zhao,Kaizhen Guo,Jinfan Guo,Xiaojing Liang,Zhiwei Zhang,Aijun Song,Xulin Lu
Removing hexavalent chromium (Cr⁶⁺) from wastewater is of great significance for ecological environment, human health, and sustainable industrial development. In this work, Cu-Al2O3 nano powders and Cu-Al2O3@AD nanocomposite were prepared by coprecipitation method, which were used to adsorb Cr⁶⁺. The materials Cu-Al2O3@AD have ordered structures, and rich functional groups as verified by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), energy spectrum analysis (EDS), and field emission scanning electron microscope (FESEM). Then, Cu-Al2O3@AD was used as adsorbents for fast and efficient removal of Cr⁶⁺ from aqueous solution by batch equilibrium experiments. The experimental results demonstrate that when the adsorbent dosage was10 g/L, the pH value was 3, the initial concentration of Cr6+ was 2 μ g/mL, and the reaction temperature was 30℃, the adsorption performance of Cu-Al2O3@AD is the best, with a removal rate of up to 90%. The adsorption kinetic and isotherm data follow the pseudo-first-order equation and the Langmuir model, respectively. The adsorption mechanisms of Cr⁶⁺ are ascribed to the monolayer adsorption.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2025
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IF 3.8
Xinyu Li,Mingzhao Liang,Zhihong Zhang,Jianfeng Zhang,Jing Liang
The reduction and adsorption of Cr(VI) are critical challenges in environmental remediation. In this study, corn straw modified with polyethyleneimine (PEI-CS) was synthesized as carriers to immobilize Bacillus licheniformis MZ1 (PEI-CS-MZ1), enabling simultaneous Cr(VI) reduction and Cr(III) fixation in a high efficiency. Notably, PEI-CS-MZ1 achieved 95.61 % and 81.96 % Cr(VI) reduction under extreme conditions (pH 8 and 11 % salinity), respectively. Furthermore, this composite completely reduced 100 mg/L Cr(VI) within 24 h while maintaining 76.96 % Cr(III) fixation, which was significantly superior to free MZ1 and PEI-CS. PEI-CS-MZ1 also demonstrated exceptional stability, retaining 89.8 % Cr(VI) reduction after 10 operational cycles. This strategy revealed that Cr(VI) reduction and Cr(III) fixation were accomplished via cooperativity of bio-reduction, chemical reduction, chemisorption, and physical adsorption. This work provides theoretical foundations for designing immobilized microbial systems toward efficient remediation of Cr(VI)-contaminated wastewater.
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Nanoscale
·
2025
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IF 5.1
Yunzi Wang,Junyu Chen,Chongyu Li,Quanqi Yang,Jianjun Wang
Metal-organic frameworks (MOFs), as promising photocatalysts, have been widely used in Cr(VI) removal due to their high porosity and structural tunability, whereas the simple hybridization of MOFs was not beneficial for the separation of photogenerated carriers. In this study, a novel Al-doped and hydroxyl-functionalized Zr-based MOF (named as Al/Zr-UiO-66-(OH)2) was synthesized via dual strategies of bimetallization and hydroxylation. Characterization results confirmed that the incorporation of Al and hydroxyl groups effectively reduced the bandgap and enhanced separation efficiency of photogenerated charge. Al/Zr-UiO-66-(OH)2 (1:5) exhibited outstanding photocatalytic reduction performance towards Cr(VI) (99.3% within 2 h) under visible light. The photocatalytic rate of Al/Zr-UiO-66-(OH)2 (K = 0.0148 min-1) was 74 times higher than that of UiO-66 (K = 0.0002 min-1). Trapping experiments, EPR and XPS analysis revealed that highly efficient photoreduction of Cr(VI) into Cr(III) was attributed to electrons and ·O2- radicals. These findings provide a feasible strategy for designing MOF-based photocatalysts for practical environmental remediation.
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International Journal of Refrigeration
·
2025
·
IF 3.8
Shuyi Yao,Zhongbao Liu,Shijie Li,Zhipeng Qie
Improving water vapor adsorption performance at low humidity and enhancing thermal conductivity are beneficial for the performances of adsorption refrigeration materials. In this study, MIL-101(Cr) was integrated with graphene oxide (GO) and calcium chloride (CaCl₂) to develop high-performance composite adsorbents. The materials were characterized by XRD, Raman spectroscopy, nitrogen adsorption-desorption, and thermal conductivity measurements. Adsorption and desorption tests revealed that the MIL-101(Cr)/2% GO + 20% CaCl₂ composite exhibited the best performance, achieving a dynamic adsorption capacity of 0.368 g/g and a 36% increase in thermal conductivity compared to pure MIL-101(Cr). Meanwhile, the heat and mass transfer performance of the materials and the COP and SCP of the system were analyzed by modeling the adsorbent and the system under the corresponding operating conditions, and MIL-101(Cr)/2% GO + 20% CaCl₂ showed the best performance among all the samples of the present study in all these models. Furthermore, the composite demonstrated excellent stability after 50 adsorption-desorption cycles, retaining a desorption efficiency above 93%. The synergistic effects of GO and CaCl₂ significantly improved both water vapor adsorption and thermal conductivity, making this composite a promising candidate for energy-efficient adsorption refrigeration systems.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Lizhen Zhang,Lehui Liu,Feifei Yuan,Yisheng Huang,Zhoubin Lin
Enhancing the luminous intensity of near-infrared (NIR) phosphors is critical for practical applications. This study demonstrates that codoping charge-compensating ions (Li+, Na+, and K+) significantly improves the fluorescence emission intensity and quantum efficiency of Cr3+-doped CaMgSi2O6 (CMSO:Cr) phosphors. Optimal enhancements were achieved with specific ion concentrations: the CMSO:0.01Cr phosphor codoped with 0.8 at. % Na2CO3 exhibited a 1.8-fold increase in emission intensity, while the CMSO:0.04Cr phosphor codoped with 1.5 at. % Li2CO3 demonstrated an 8-fold enhancement. Charge compensation also improved the internal quantum yield (IQY) and photoelectric conversion efficiency without compromising the thermal stability. Mechanistic insights from absorption/emission spectra, electron paramagnetic resonance (EPR), and fluorescence lifetime analyses revealed that alkali metal ions occupy defect sites, suppress nonradiative recombination, and simplify emission profiles by eliminating defect-induced luminescent centers.
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