CELLULOSE
·
2022
·Vol. 29
·期 6
·3389-3406
·
IF 6.123
Lang Daning,Xu Xia,Wu Ronglan,Wang Wei,Shi Ming,Jia Ke,Chen Shifei,Wang Jide
A cellulosic material has been synthesized that could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. Cellulose-graft-tetraethylenepentamine molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment. Graphical abstract
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lei Wang,Haris Muhammad,Minwang Laipan,Xiaohu Fan,Junkang Guo,Yongtao Li
The demand for clean water and soil drives high efficiency, less expensive, and eco-friendly clay-composites as adsorbents for remediation of heavy metals polluted environment. We have developed a new water remediation technique by using an organic-inorganic composite, L-cysteine doped polypyrrole modified bentonite (L-cys/PPy/BT) for removal of Cr(VI) and Mo(VI). The L-cys/PPy/BT showed maximum adsorption capacities of 318.5 and 65.4 mg/g for Cr(VI) and Mo(VI) respectively. For Cr(VI) and Mo(VI) the sorption process on L-cys/PPy/BT followed the Freundlich and Langmuir isotherm models, respectively. Furthermore, the pseudo-second-order kinetic model described the adsorption behavior of Cr(VI) and Mo(VI). Moreover, the thermodynamic parameters indicated that sorption processes were endothermic and spontaneous. Mechanistic assessment revealed that adsorption of Mo(VI) on L-cys/PPy/BT could be attributed to chelation, electrostatic attraction and ion-exchange of Mo(VI) with the imine/amine functional groups in the material's matrix , while electrostatic attraction, ion exchange, chelation and redox reaction played a significant role in the removal of Cr(VI). This research provides a new approach for the use of clay materials as potential sorbents for removal of heavy metal ions in contaminated water .
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2025
·
IF 0
Yiyin Zhu,Qibing Dong,Atif Sial,Abdelkader Labidi,Ke Zhao,Ximing Li,Junjun Wang,Chuanyi Wang
Achieving efficient ligand-metal charge transfer remains a significant challenge for constructing high-performance N 2 -fixing MOF photocatalysts. Herein, we successfully fabricated mixed-metal MIL-101(Fe/Cr) materials to achieve ligand-metal charge transfer, leading to significantly improved N 2 fixation performance. Performance test under visible light demonstrated that MIL-101(Fe/Cr) achieved nitrogen fixation activity of 125.19 μmol h −1 g −1 , which is 1.7 times greater than that of pure MIL-101(Fe). The experimental confirm that the incorporation of Cr metal enables the more favorable accumulation of photogenerated electrons at the Fe catalytic centers, attributed to increased electronic interactions and enhanced charge transfer efficiency, thus facilitating the activation process of N 2 , and consequently enhancing ammonia (NH 3 ) production. This work provides new insights into strategies for improving the ligand-metal charge transfer efficiency of MOF-based photocatalytic nitrogen fixation materials.
✓ 已验证
DOI
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xixiang Liu,Xiurong Chen,Yongming Luo,Caiyun Han,SuFang He
Much research has focused on the removal of individual contaminants such as As(V) or Cr(VI) from wastewater. However, limited efforts have been devoted to their simultaneous removal in binary systems. This is largely due to the complexity of wastewater matrices and the similar chemical characteristics of As(V) and Cr(VI). In this study, La-modified UiO-66 was synthesized by a one-pot method and employed as a multifunctional adsorbent to simultaneously remove As(V) and Cr(VI) via batch experiments. Characterization results demonstrated that La was successfully grafted onto UiO-66 through Zr-ligand (O)-La and Zr-ligand (O)-Zr linkages, while the fcu structural topology and microporous nature of UiO-66 were well remained. For simultaneous uptake of As(V) and Cr(VI), a synergistic effect of Cr(VI) was observed on As(V) removal, whereas As(V) exhibited an inhibitory effect on Cr(VI) adsorption. Compared with the single component system, the adsorption capacity of As(V) in the binary system increased by approximately 26 %, while the adsorption capacity of Cr(VI) decreased by about 20 %. The enhanced uptake of As(V) was attributed to the formation of a new Cr As complex compound between adsorbed Cr(III) and As(V). In contrast, the inhibitory influence of As(V) on Cr(VI) adsorption was ascribed to the strong affinity of As(V) for the active adsorption sites. Overall, these results demonstrate that La-modified UiO-66 is a promising candidate for the simultaneous removal of As(V) and Cr(VI) in binary systems, particularly under conditions of elevated As(V) concentration.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Junying Yu,Yin Ren,Luming Zhou,Peng Ye,Lin He,Yahong Wang,Yingrui Chen,Chunlin Fu
The trade-off between power conversion efficiency (PCE) and average visible transmittance (AVT) in semi-transparent solar cells significantly restricts their application in building-integrated photovoltaics. Bismuth ferrite (BiFeO 3 , BFO)-based materials have shown great potential to address this trade-off due to their inherent ferroelectric properties and tunable optical bandgap. However, even with performance optimization through chemical doping, a considerable bottleneck remains. Using the Ca/Cr co-doped BFO system as an example—whose optimal composition still exhibits a PCE below 1.4 %—this study proposes a new strategy of physical thickness control to overcome the limitations of chemical doping. By systematically investigating the influence of the thickness (200–350 nm) of the Ca/Cr co-doped BFO layer with optimal composition on device performance, it was found that increased thickness significantly enhances light absorption and optimizes the distribution of the built-in electric field. The results demonstrate that at a thickness of 336 nm, the device achieves the best photovoltaic performance (PCE = 1.86 %, open-circuit voltage ( V oc ) = 1.57 V, short-circuit current density ( J sc ) = 2.30 mA/cm 2 ), representing an improvement of over 35 % compared to the reference thickness (210 nm). Meanwhile, at a thickness of 285 nm, the device maintains a relatively high AVT (33.70 %) and achieves the highest light utilization efficiency (LUE = 0.6100 %). Electrical impedance spectroscopy analysis indicates that increased thickness effectively reduces the carrier recombination probability. This study reveals the synergistic mechanism of thickness regulation through “light absorption–built-in electric field–carrier transport” in balancing PCE and AVT, providing a reliable optimization strategy for semi-transparent ferroelectric photovoltaic devices.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Tong Xu,Xiaopei Ding,Chengcai Li,Haoyang Cheng,Guojin Liu,Hailin Zhu,Yuhai Guo,Xueliang Jiang,Jiuming Li
Accelerated industrial expansion has led to significant wastewater pollution, with effluent containing the toxic heavy metal Cr(VI) posing severe threats to ecosystems and human health. The combination of metal-organic frameworks (MOFs) and membrane separation techniques offers promising solutions for pollutant removal. This study developed a polytetrafluoroethylene (PTFE)-based composite membrane for effective Cr(VI) removal from aqueous solutions. This membrane was prepared through the in-situ synthesis of zinc-zirconium bimetallic MOFs on a PTFE membrane that had been modified with L-DOPA/PEI. The composite membrane demonstrated optimal Cr(VI) adsorption at a Zr:Zn molar ratio of 1:4, under conditions of 45 °C and pH = 2, with a maximum adsorption capacity of 335.1 mg/g. The adsorption process of Cr(VI) onto the composite membrane adhered to both the pseudo-second-order kinetic model and the Freundlich adsorption isotherm. Thermodynamic analyses confirmed a spontaneous, endothermic process. The composite membrane, with its excellent adsorption capacity, filtration performance, and recyclability, stands out as a highly effective material for the removal of Cr(VI) from aqueous solutions. Furthermore, it addresses the issues of aggregation, difficulty in separation, and the recycling challenges associated with powder-like MOFs, demonstrating significant potential for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Xiayu Liang,Aylin M. Deliormanlı,Qingle Zeng
A novel composite material, Poly(IL-AA)@MIL-101(Cr), combining metal-organic framework, polymeric ionic liquid and acrylic acid, was synthesized for the selective and efficient adsorption of rare earths europium(III) (Eu 3+ ). Characterization of the materials was carried out using techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET). The results demonstrate successful incorporation of the polymeric ionic liquid onto the material surface while preserving the crystal structure and morphology of MIL-101(Cr). Adsorption experiments were conducted to explore parameters including solution pH, initial Eu 3+ concentration, and duration, with comprehensive analyses of adsorption kinetics, isotherms, and mechanisms. Findings reveal that Poly(IL1-AA)@MIL-101(Cr), Poly(IL3-AA)@MIL-101(Cr), and Poly(IL5-AA)@MIL-101(Cr) achieve adsorption equilibrium for Eu 3+ at approximately 9 h with an equilibrium pH of 6.2. The adsorption of Eu 3+ predominantly follows a pseudo-second-order kinetic model and Langmuir isotherm adsorption model. Moreover, the prepared composite material exhibits superior adsorption selectivity for Eu 3+ over other metal ions in the mixture (K + , Mg 2+ , Ni 2+ , Co 2+ , Zn 2+ , La 3+ , and Nd 3+ ). Even after five adsorption-desorption cycles, the composite material maintains satisfactory adsorption performance.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hui Wang,Xinyi Long,Xuyi Yang,Qiyin Huang,Zewen Chen,Shengji Wu,Jie Zhou
Coal-fired mercury pollution poses an escalating threat to the ecosystem and human health. In this study, we designed and prepared transition metal oxides (MO x ) supported non-carbon-based adsorbents for Hg 0 removal using non-thermal plasma, based on the mechanism of Hg 0 removal. Specifically, MO x supported SiO 2 adsorbents were examined to explore the correlation between their redox ability and Hg 0 removal. The plasma treatment process could enhance the catalytic oxidation activity of the MO x (oxygen activation center) and effectively enhance Hg 0 removal efficiency. The Hg 0 removal efficiencies of Co 3 O 4 /SiO 2 -P and CrO x /SiO 2 -P prepared by plasma could maintain above 95.0 % and 85.0 % in the whole test, whereas the Co 3 O 4 /SiO 2 and CrO x /SiO 2 adsorbents prepared by traditional incipient wetness impregnation method exhibited lower Hg 0 removal efficiencies of nearly 20–30 %. Furthermore, with the addition of SO 2 , the Hg 0 removal performance of Co 3 O 4 /SiO 2 -P decreased significantly, while the performance of CrO x /SiO 2 -P remained relatively unchanged. Characterization results containing X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the oxygen activation centers on CrO x /SiO 2 -P exhibited excellent resistance to SO 2 and were less susceptible to SO 2 occupation than those on Co 3 O 4 /SiO 2 -P. The plasma-prepared CrO x /SiO 2 -P adsorbents demonstrate promising potential for industrial applications in Hg 0 removal.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
You Yanran,Zhu Hongtao,Dong Hongliang,Sheng Guodong
In this work, FeS was anchored on mesoporous silica microspheres (SiO 2 200, SiO 2 500, and SiO 2 1000), and named as FeS@SiO 2 (i.e., FeS@SiO 2 200, FeS@SiO 2 500, FeS@SiO 2 1000), in adsorbing and detoxifying U(VI)/Cr(VI) from wastewater. Results demonstrated that FeS@SiO 2 exhibited higher efficiency towards U(VI)/Cr(VI), outperforming FeS and SiO 2 alone. Kinetic investigations revealed that adsorption of U(VI)/Cr(VI) followed pseudo–second–order model best, highlighting effective chemical interplay. XPS investigations demonstrated multi–species which was included FeS, Fe(II), S 2− and polysulfide (S 2 2− , S n 2− ) could be employed as reductants for U(VI)/Cr(VI) adsorption. The combination of SiO 2 and FeS offered an enhanced efficiency for U(VI)/Cr(VI), making these composites promising materials in water purification. Graphical
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2020
·
IF 2.6
Lincheng Li,Yunlan Xu,Dengjie Zhong
Herein, we reported a simple solvothermal and chemical oxidation method to synthesize a magnetic core–shell composite (Fe3O4@UiO-66@PANI) for Cr(VI) removal from wastewater. Due to the porosity and stability of UiO-66 and stability, high acid resistance, and multiple active (reducing and chelating) groups of polyaniline (PANI), Fe3O4@UiO-66@PANI exhibited excellent efficiency, regeneration, and reusability performance for Cr(VI) removal. Its maximum adsorption capacity and removal rate were 474.42 mg·g–1 and 99.90%, respectively. The effects of initial pH values, contact time, and initial Cr(VI) concentration on Cr(VI) removal were investigated. The fitted data showed that the adsorption process was consistent with the pseudo-second-order kinetic model and Langmuir isothermal model. The study of the mechanism shows that the excellent efficiency of Fe3O4@UiO-66@PANI is due to the electrostatic adsorption and reduction of Cr(VI) and the chelation of Cr3+. The results demonstrate that Fe3O4@UiO-66@PANI is a promising adsorbent for the Cr(VI) removal.
✓ 已验证
DOI
高影响因子
AQUA-Water Infrastructure Ecosystems and Society
·
2021
·Vol. 70
·期 4
·570-586
·
IF 0
Liu Jiamin,Li Jianjun,Liang Juan,Jing Chengjun,Guo Jiaxiu
Carbon dot (CD)-modified graphitic carbon nitride (g-C 3 N 4 ) photocatalysts were synthesized through a one-step homogeneous thermal pyrolysis. The synergetic effect of citric acid (Cit) and g-C 3 N 4 /CDs for high-performance visible light Cr(VI) photocatalytic reduction had been investigated. Cit was not only acted as a hole scavenger, but might also form surface charge transfer complexes (CTC) with g-C 3 N 4 which delivered electrons on the Highest Occupied Molecular Orbital (HOMO) of Cit to the conduction band (CB) of g-C 3 N 4 . CDs decorated on g-C 3 N 4 could provide channels for the preferential transfer of electrons on CTC to the CB of g-C 3 N 4 as well as improved separation of the charge carriers. Owing to these synergistic effects, g-C 3 N 4 /CDs displayed much higher photocatalytic performance for the reduction of Cr(VI), which was 1.89 times higher than g-C 3 N 4 . Moreover, the synergetic photocatalytic reduction mechanisms of aqueous Cr(VI) were proposed to elucidate the active species formation and photogenerated electron transfer. The results suggested that the in situ generated hydrogen peroxide (H 2 O 2 ) dominated the reduction of Cr(VI). The addition of Cit could trigger the in situ generation of H 2 O 2 and the decorated CDs further enhanced the reaction. This work demonstrated the role of widely existed Cit on the photocatalytic reduction of Cr(VI) in natural aquatic environment. g-C 3 N 4 /CD photocatalysts were synthesized for Cr(VI) reduction. CDs promoted light harvest and improved the separation of charge carriers. Cit triggered the visible light photocatalytic reduction of Cr(VI) over g-C 3 N 4 /CDs. H 2 O 2 is the main effective activator for Cr(VI) reduction in the g-C 3 N 4 /Cit system. The photocatalytic reduction pathways of Cr(VI) in the presence of cit were proposed.
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guodong Zhang,Zhe Liu,Yaning Kong,Fei Wang
Hydrate-based adsorption and hydration natural gas (AHNG) technology was reported to achieve large methane storage density under mild conditions. In order to enhance methane uptake, a composite nano porous material of MIL-101(Cr)@AC was prepared through fluorine-free hydrothermal reaction, and methane adsorption isotherms for both dry and wet samples were measured under hydrate favorable conditions. Hydrate in-situ formation loaded by the composite material was also carried out, while hydrate kinetics was evaluated by Raman spectrum. It was found that MIL-101(Cr) remains cubic symmetric structure when activated carbon (AC) was doped, but its size decreases with the increase in AC doping amount, while the specific surface area and pore volume significantly increase, and this enhances methane adsorption that increases by 65.58%. More enhanced methane uptake was obtained when wet sample was applied due to adsorption and hydration synergy, wherein methane physical adsorption ability remains, while formed hydrate stores extra methane. The contribution of hydrate to methane uptake is up to 40%, so large methane storage density is anticipated, methane volumetric uptake is up to 179.3 V/V under a mild condition (9.3 MPa and 274.15 K), which increases by 38.03%. Compared with our recently reported ZIF-8@AC, methane storage capacity in this new material increases by 36.5% (Chem. Eng. J., 2023, 455, 140503). In addition, hydrate progressive growth with the increase in adsorption pressure was observed, the area ratio of hydrate large cages to small one finally approaches to the theoretical value of 3:1, suggesting approximately complete conversion of pre-adsorbed water.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）