JOURNAL OF MOLECULAR STRUCTURE
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2021
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IF 3.196
Congcong Piao,Jianhe Tang,Yitong Lin,Zhiyu Liu,Xueke Liu,Dawei Fang,Jun Wang
A high-efficiency Z-scheme photocatalyst, Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 , is fabricated successfully via hydrothermal and photo-deposition methods. All as-prepared samples are characterized by XRD, SEM, TEM, FT-IR, EDX, XPS, Raman spectroscopy, PL and DRS. The activity of the prepared Z-scheme Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 photocatalyst is evaluated through photocatalytic conversion of Cr(VI) under simulated solar light irradiation. The meaningful influencing factors such as simulated solar light irradiation time, light intensity, sacrificial agents and cycling times are investigated. The results displayed that the existence of Er 3+ :YAlO 3 can improve the utilization ratio of solar light for wide band-gap SrTiO 3 . Moreover, the formation of Z-scheme SrTiO 3 /WO 3 photocatalytic system and the introduction of Au nanoparticles as electron mediator and co-catalyst can promote the separation of photo-induced electron and hole to obtain much high photocatalytic activity . Finally, the mechanism on conversion of Cr(VI) caused by Z-scheme Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 photocatalyst is put forward. © 2021 Elsevier B.V. All rights reserved.
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Energy & Environmental Materials
·
2021
·Vol. 6
·期 1
·e12254
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IF 15.122
Ailin Li,Jian Xiong,Ye Liu,Liming Wang,Xiaohong Qin,Jianyong Yu
MIL-101(Cr) is a promising moisture absorbent for solar-driven water harvesting from moisture to tackle the worldwide water shortage issue. However, the MIL-101(Cr) powder suffers from a long ab/desorption cycle due to the crystal aggregation caused by its inherent powder properties. Here, we demonstrate a MIL-101(Cr) nanofibrous composite membrane with a nanofibrous matrix where MIL-101(Cr) is monodisperse in the 3D porous nanofibrous matrix through a simple spray-electrospinning strategy. The continuous porous nanofibrous matrix not only offers sufficient sites for MIL-101(Cr) loading but also provides rapid moisture transport channels, resulting in a super-rapid ab/desorption duration of 50 min (including an absorption process for 40 min and a desorption process for 10 min) and multicycle daily water production of 15.9 L kg −1 d −1 . Besides, the MIL-101(Cr) nanofibrous composite membrane establishes a high solar absorption of 92.8%, and excellent photothermal conversion with the surface temperature of 70.7 °C under one-sun irradiation. In addition, the MIL-101(Cr) nanofibrous composite membrane shows excellent potential for practical application due to its flexibility, portability, and use stability. This work provides a new perspective of shortening MOF ab/desorption duration by introducing a porous nanofibrous matrix to improve the specific water production for the solar-driven ab/desorption water harvesting technique.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ousmanou Njoya,Shengxin Zhao,Xingyu Kong,Jimin Shen,Jing Kang,Binyuan Wang,Zhonglin Chen
The treatment of industrial wastewater containing Cr(VI)–organic compounds is a long-term concern in the field of environment. In order to realize the high-efficient reduction of Cr(VI) and solve the problem of Cr(III) residue in water environment, a novel catalytic chemical reduction/membrane filtration method was developed for the removal of total Cr (TCr) in a system with coexisting Cr(VI) and oxalate (Ox). The effects of the concentrations of Ox, Fe(III), and Al(III), the dosage of NaBH 4 , and sedimentation time on the removal of Cr(VI) containing Ox by NaBH 4 were investigated. Additionally, the simultaneous removal of turbidity and TCr using a microfiltration membrane was investigated, and the reason for the enhanced TCr removal was clarified. The results of ion chromatography (IC), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) suggested that when Cr(VI) and Ox coexist, low concentrations (0.3 mM) of Fe(III) or Al(III) contributed significantly to the high turbidity caused by the formation of suspended solids (SS) following the reduction of Cr(VI) by NaBH 4 . However, almost all the Cr(III) could be removed by a 1-μm microfiltration membrane. The high turbidity system formed by Ox and Cr(III) is unstable, and some Ox will gradually release their binding sites with Cr(III) with the extension of the natural settling time. For 24 h, 53.75% of Ox was involved in the formation of SS, while in the presence of Fe(III) or Al(III), only 11.28% and 6.30% of Ox were involved, respectively. High concentrations of Fe(III) and Al(III) enhanced the reduction of Cr(VI) by NaBH 4 . The removal of TCr was close to 100% after natural sedimentation for 15 min and combined with a microfiltration membrane. This result is caused because Fe(III)–Cr(III) or Al(III)–Cr(III) can form larger SS, which is easily intercepted by the microfiltration membrane. The development of a novel combined method of catalytic chemical reduction and membrane filtration will be beneficial for reducing the retention of TCr in the environment.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Bo-Mei Liu,Rui Zou,Sun-Qi Lou,Yi-Fan Gao,Li Ma,Ka-Leung Wong,Jing Wang
X-ray-stimulated near-infrared persistent luminescence nanoparticles (NIR-PLNPs) offer attractive capabilities for autofluorescence free deep-seated imaging and depth-independent treatment, but still suffer from adverse effects caused by high-dose X-ray irradiation (>5 Gy). From the viewpoint of two centers of NIR-PLNPs, i.e., X-ray photon absorption center and defects center, we here propose a top-down composition design strategy for the development of low dose X-ray-stimulated NIR-PLNPs with improved X-ray photon absorption efficiency and optimized persistent luminescence (PersL) performance. Successfully, hypersensitive X-ray-stimulated NIR-PLNPs LaGaO 3 :Sb 3+ ,Cr 3+ with a super-long PersL emission (>500 h) at ∼750 nm are prepared. The nature of high Z atomic constituents of the host LaGaO 3 endows these NIR-PLNPs with strong X-ray absorption capacity. Simply by codoping with size-mismatched ions Sb 3+ , the concentration of oxygen vacancies in the host is rationally optimized, leading to the enhanced NIR PersL performance of Cr 3+ ions. In vivo bioimaging demonstrates that the designed X-ray-stimulated NIR-PLNPs LaGaO 3 :Sb 3+ ,Cr 3+ can be readily reactivated under X-ray irradiation with even a lower dose to 0.37 Gy, showing the advantages of these nanoparticles on deep-seated imaging and treatment. More importantly, we anticipate that our proposed top-down composition design strategy can be applied to develop much low dose X-ray-stimulated NIR-PLNPs in the future.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xuefeng Liu,Guoshuai Liu,Shijie You
Advanced reduction process (ARP) has drawn an increasing interest as a new manner for removing oxidative pollutants in water. In this paper, we demonstrate the possibility of in-situ reduction of Cr(VI) by CO 2 ·- produced from formate originally existing in leather wastewater by visible-light-driven ARP containing black TiO 2 photocatalyst. The prepared black TiO 2 with nanotube structure achieves remarkable enhanced the reduction rate of Cr(VI) as high as 96.2% (k = 0.0114 min −1 ) in the presence of formate, which is approximately 4.75 times than that of 56.3% (k = 0.0024 min −1 ) in the absence under 120 min visible-light irradiate at unadjusted pH. The results exhibit a distinct contrast with commercial TiO 2 (P25). A series of control experiments are also performed, indicating that formate is able to convert the oxidative environment into a highly reductive one, and the formate concentration, black TiO 2 dosage and pH may greatly impact on the Cr(VI) reduction rate. According to the electron spin resonance (ESR) measurement, CO 2 ·- radicals can be directly verified as dominate radical in this system. Moreover, this system appears to be attractive for creating photochemical systems where in-situ production of CO 2 ·- radicals may be realized by using formate. Then this in-situ ARP system will provide a new perspective for the Cr(VI) removing, which makes leather wastewater treatment much easier and more sustainable in the future.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Yixing Duan,Jisuan Tan,Zeming Huang,Qiaomei Deng,Sijia Liu,Guan Wang,Ligui Li,Li Zhou
Nowadays the synthesis of stable fluorescent sulfur quantum dots (SQDs) remains a big challenge. Herein, the utilization of carboxymethyl cellulose (CMC) to synthesis of SQDs is reported. Benefiting from the unique composition and structure of CMC macromolecule, the resulted CMC-SQDs simultaneously show high aqueous dispersibility and stability, tunable emission, stable fluorescence and low cytotoxicity, which make them promising for working as a fluorescent probe. Fluorescence detection experiments suggested that the CMC-SQDs could serve as a fluorescence on-off-on switch to sensitive and selective detection of Cr(VI) and ascorbic acid (AA) based on the inner filter effect (IFE). The limit of detection towards Cr(VI) and AA can reach 0.024 and 0.18 μM with linear range of 0.5−225 and 1−300 μM, respectively, which compares favorably to other reported fluorescent probes. In addition, the employment of fluorescent CMC-SQDs for practical detection of Cr(VI) and AA was also studied.
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高影响因子
MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Bo Hu,Yong Ma,Ning Wang
Drinking water shortage is a worldwide issue, so that the quality control and treatment of industrial sewage is very important. In this present work, Ag doped carbon nanoparticles (Ag-CDs) were prepared by a simple hydrothermal method, which could be used as an antibacterial and simultaneous detection of dichromate (Cr 2 O 7 2− ). The prepared Ag-CDs were characterized through high resolution transmission electron microscopy (HRTEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The characterization results indicated that the diameter of Ag-CDs were distributed in a range of 2.6–6.0 nm (ca. 4.25 nm) with the functional groups such as OH, NH 2 and CONH in the structure. Cr 3+ and Cr 2 O 7 2− could be distinguished under 365 nm UV light or fluorospectrophotometer. The Ag-CDs nanoparticles was also applied to the detection of Cr 2 O 7 2- in real water samples. There exhibits excellent antibacterial performance to both Escherichia coli O157:H7 ( E. coli O157:H7) and Staphylococcus aureus ( S. aureus ) for Ag-CDs nanoparticles. E. coli O157:H7 or S. aureus was deal with 2 μg mL −1 of Ag-CDs nanoparticles under 5 min with a killing rate of 100%, respectively. As a novel dichromate-sensitive antibacterial, the Ag-CDs nanoparticles hold great promise to broaden application in the environment pollution and water purification.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Xin Zhong,Zhipeng Lu,Wen Liang,Baowei Hu
The magnetic covalent organic framework with β-ketoenamine linkage (Fe 3 O 4 @COF(TpPa-1)) was fabricated by the hydrothermal method. The obtained Fe 3 O 4 @TpPa-1 integrated four advantages, namely easy preparation, high stability, excellent adsorption performance (485.2 m 2 /g) and good recoverability (19.5 emu/g), which enabled it an ideal sorbent for wastewater treatment. Fe 3 O 4 @TpPa-1 exhibited excellent adsorption capacities for Cr (VI) (245.45 mg/g) and bisphenol A (1220.97 mg/g). The adsorption kinetics and isotherms were in alignment to the pseudo-second-order and Langmuir model, respectively. After five times cycles, the adsorption capacity of Fe 3 O 4 @TpPa-1 still retained at a high level. According to Materials Studio simulation and XPS analysis, the adsorption mechanism was attributed to the presence of the homogeneously distributed imine and carbonyl functional groups in the framework of TpPa-1, allowing them to serve as platforms for anchoring heavy metals and organic pollutants. Besides, the hydrophobic skeleton structures of TpPa-1 endowed them good adsorption performance towards organic pollutants via hydrogen -bonding (NH … O … HO) and π-π interaction. Therefore, the recyclable Fe 3 O 4 @TpPa-1 showed a broad application prospects in environmental remediation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Zhansheng Wu,Xiufang He,Yongtao Xue,Xia Yang,Yunfeng Li,Qubing Li,Bing Yu
The hydrophobicity of MoS 2 /g-C 3 N 4 based photocatalysts remains a major hurdle to their successful application for the remediation of water-soluble contaminants such as herbicides and heavy metals. Herein, we develop new photocatalysts based on the graft of three different cyclodextrins (α-CD, β-CD and γ-CD) on MoS 2 /g-C 3 N 4 composites (CDs/MoS 2 /g-C 3 N 4 ) for the removal of glyphosate and Cr (VI) from simulated agricultural runoff. CDs/MoS 2 /g-C 3 N 4 show remarkably enhanced photocatalytic activities for glyphosate degradation and Cr (VI) reduction compared to pristine MoS 2 /g-C 3 N 4 . In addition, γ-CD/MoS 2 /g-C 3 N 4 exhibits the highest hydrophilicity and photocatalytic activity among these three different cyclodextrins grafted MoS 2 /g-C 3 N 4 . The mechanistic investigation indicates that cyclodextrins can not only increase the accumulation of glyphosate and Cr (VI) onto the surface of CDs/MoS 2 /g-C 3 N 4 but also facilitate the fleet separation of photo-induced electron-hole pairs. In summary, these results collectively imply that the graft of cyclodextrins could be an effective strategy to improve the photocatalytic efficiency of MoS 2 /g-C 3 N 4 composites for the removal of glyphosate and Cr (VI) from simulated agricultural runoff.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Li Jinlei,Guo Jiaqing,Li Hao,Qu Junle,Song Jun
Synthesis of excellent imaging nanoparticles plays a critical role in disease detection. Here, novel Bi 2 Ga 4 O 9 :Cr (BGOC) nanoparticles were synthesized for persistent luminescence and computed tomography dual-mode imaging. The Cr 3+ ions in the BGOC luminescent nanoparticles were coped as the luminescent center, and the afterglow emission was located in the first biological imaging window. Bi 3+ ions served as the computed tomography (CT) imaging contrast agent. The NH 2 groups were modified on the surface of the nanoparticles to make them highly biocompatible, and folic acid molecules were modified to facilitate the specificity. This modification facilitated simultaneous persistent luminescence and CT imaging in tumor-bearing mice due to the overexpression of the folic acid molecules’ receptors. Furthermore, instead of visible light, x-rays were used as the excitation light source to activate the BGOC-folic acid nanoprobes and realize long time and high sensitivity imaging of tumors in vivo because of their capacity for deep tissue penetration. Therefore, such nanoprobes can provide a promising depth-independent detection mode for high sensitivity diagnosis and long-term monitoring of diseases.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
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IF 5.909
Shaoru Liu,Weizi Zhang,Peng Zhu,Songlin Zuo,Haian Xia
The study reports a facile synthesis of Ag-g-C 3 N 4 /AC composites with highly photocatalytic activity and good adsorption capacity by an impregnation-thermal polycondensation process. The resulting Ag-g-C 3 N 4 /AC composites were used for treatment of different pollutants in water including Rhodamine B (RhB), Cr(VI) ions and pathogens . When the precursor mass ratio of urea and AC was 2:2, the resultant Ag-g-C 3 N 4 /AC catalyst showed the best photocatalytic performances. In particular, the composite photocatalysts exhibited highly bactericidal efficiency, which could reach 99.9% after 120 min of irradiation. The higher photocatalytic performances of Ag-g-C 3 N 4 /AC composites were attributed to the surface plasmon resonance (SPR) effect of Ag nanoparticles (NPs) together with the interfacial synergistic effects. Meanwhile, AC not only exhibited excellent adsorption capacity, but also decreased aggregation of g-C 3 N 4 , which could enhance the separation efficiency of photogenerated charge carriers. It was uncovered through Electron Spin Resonance (ESR) and radical scavenger experiments that • OH radicals, • O 2 − and h + participate in the RhB degradation under the visible light. This work shows that the high-efficient and stable Ag-g-C 3 N 4 /AC composites have a great potential in the treatment of organic pollutants , toxic heavy metals and pathogenic bacteria by adsorption/photocatalysis for practical water treatment .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Liying Sheng,Baihe Huangfu,Qinhai Xu,Wenli Tian,Zhenjiang Li,Alan Meng,Shuqin Tan
A one-step hydrothermal process to synthesize N-doping graphene quantum dots (N-GQDs) using PVP K90 as the novel self-passivation agent, in which the self-passivation and N-doping is realized simultaneously, is first proposed. The as-obtained N-GQDs with an average diameter of 1.9 ± 0.6 nm can emit blue fluorescence (365 nm excitation), and possess a high fluorescent quantum yield (QY) of 64.2%. Due to the inner filter effect, N-GQDs are considered as outstanding fluorescent probes for detecting Cr(VI), which exhibit a lower detection limit (91 nM) and a wider linear range (0.1–100 μM). Significantly, the fluorescent probe also indicates a remarkably high selectivity towards Cr(VI) among other metal ions with high concentrations. The fluorescence intensity of N-GQDs quenched by Cr(VI) is significantly turned on through adding reducing agent. What’s more, N-GQDs have been successfully used to detect Cr(VI) in running water. In addition, the as-obtained N-GQDs could be further applied in cell imaging due to its biocompatibility and low cytotoxicity. Therefore, N-GQDs could be a wondrous sensing system for detecting Cr(VI) and fluorescent marker of MCF-7 cells with a wide range of potential applications.
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