MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Yu Quan Ren,Shi Yong Sun,Edward Opong Acheampong,Fa Qin Dong,Biao Biao Ma,Ke Wang,Xiao Yu Fan
A one-step synthesis of visible light responsive diatomite/g-C3N4 composite material was prepared by impregnation-calcination method. The products were characterized by Scanning electron microscope, X-ray diffractometer, Ultraviolet diffuse reflectance spectroscopy, Fourier transform infrared spectrometer, and Photoluminescence spectrometer. The SEM results showed that g-C3N4 was successfully attached onto the surface of the diatomite. Also the composite materials were more light-responsive compared with the single phase material. The composite materials had a maximum degradation efficiency up to nearly 91.79%. The significant improvement in photocatalytic performance was due to the porous structure of diatomite, increase of contact area of carbon nitride.
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DOI
RSC Advances
·
2021
·Vol. 11
·期 61
·38915-38924
·
IF 3.361
Peng Li,Xin Wang,Guifang Wang,Li Zhao,Yuwen Hong,Xianzhi Hu,Futing Zi,Huiling Cheng
Using Cr(VI) as the imprinted ions and 2-allyl-1,3-diphenyl-1,3-propanedione (ADPD) (a compound synthesized by independent design) as the functional monomer, a series of chromium ion-imprinted composite membranes (Cr(VI)-IICMs) and corresponding non-imprinted composite membranes (NICMs) were synthesized and tested. The results showed that the Cr(VI)-IICM10 membrane prepared under optimal experimental conditions exhibited a high adsorption capacity towards Cr(VI) (Q = 30.35 mg g−1) and a high imprinting factor (α = 2.70). The structural characteristics of Cr(VI)-IICM10 and NICM10 were investigated using FE-SEM, ATR-FTIR, and BET techniques combined with UV-Vis photometry and inductively coupled plasma emission spectrometry (ICP-OES) to evaluate the adsorption performance and permeation selectivity, while the effect on adsorption permeance of varying the experimental conditions including the solvent type, pH, and temperature was also investigated. The results showed that Cr(VI)-IICM10 is a mesoporous material with excellent permeation selectivity, reusability, and favorable pH response, and that its adsorption behavior is in accordance with the Langmuir model and pseudo-first-order kinetics. Thus, Cr(VI)-IICM10 shows great potential towards utilization as a “smart membrane” to control the separation and removal of Cr(VI) in wastewater, and also proved a reasonable design of the new functional monomer ADPD.
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DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1807-1813
·
IF 1.134
Wang Yulin,Qiu Xiuzhen,Li Yangyang,Guo Huishi,Lu Wenguan,Nie Libo
A novel molecularly imprinted polymer material based on the metal-organic framework NH2-MIL-101(Cr) (MOF-MIP) was prepared. The synthesized MOF-MIP was characterized by IR, XRD, SEM and N2 absorption. The characterization results displayed that the MOF-MIP which exhibited
an octahedral shape had good dispersibility, good thermal stability and a high surface area. Subsequently, the adsorption behavior of MOF-MIP to diclofenac sodium (DS) in aqueous solution was examined. A series of adsorption experiments demonstrated that the MOF-MIP had high transfer mass
rates and high sensitivity and selectivity for DS. Then the MOF-MIP was used as the adsorbent of dispersive micro-solid phase extraction (DMSPE) for the detection of DS in urine. Under optimum conditions, the average recovery of DS ranged from 88.3 to 101.6% with RSD of 5.6%. The described
method provides a rapid route for determination of DS in human urine.
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DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 7
·2027-2033
·
IF 2.234
Chen Dongrui,Li Benzhen,Liao Youhao,Lan Hongwei,Lin Haibin,Xing Lidan,Wang Yating,Li Weishan
Three samples, LiNi 0.5 Mn 1.5 O 4 , LiNi 0.4 Mn 1.4 Co 0.2 O 4 , and LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 , were prepared by sol–gel method and characterized by powder X-ray diffraction, Fourier transformed infrared spectroscope, scanning electron microscopy, Brunauer–Emmett–Teller surface area, four-probe resistance, cyclic voltammetry, electrochemical impedance spectroscopy, and charge–discharge test. It is found that the co-doped sample LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 exhibits an improved performance compared with the Co-doped sample LiNi 0.4 Mn 1.4 Co 0.2 O 4 and the undoped sample LiNi 0.5 Mn 1.5 O 4 , especially at elevated temperature. At 25 °C, the discharge capacity of LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 is 130 mAh g −1 at 0.1 C and 103 mAh g −1 at 10 C. At an elevated temperature (55 °C), its 1 C discharge capacity is 136 mAh g −1 and maintains 95.6 % of its initial capacity after 100 cycles. Compared with the reported results of LiNi 0.4 Mn 1.4 Co 0.2 O 4 and LiNi 0.475 Mn 1.475 Co 0.05 O 4 , the co-doped sample LiNi 0.4 Mn 1.4 Cr 0.15 Co 0.05 O 4 , with least content of Co, 0.05, possesses not only the high C-rate capacity but also the structural stability. The mechanism on the electrochemical performance improvement of LiNi 0.5 Mn 1.5 O 4 by the co-doping was discussed.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·647-653
·
IF 3.269
Chol-Nam Ri,Kim Song-Gol,Jong Ju-Yong,Sung-Nam Pak,Song-Chon Ri,Jong-Hwa Ri
Herein, a Bi2WO6/Bi4V2O11 heterostructured photocatalyst was fabricated through a facile one-pot solvothermal method. In this heterojunction system, highly homogeneous-dispersed Bi4V2O11 nanocrystals were anchored onto Bi2WO6 nanoflakes, endowing the heterojunction with nanosized interfacial contact. Because of the favorable interfacial contact and band alignment, photoinduced charge carrier transfer is facilitated in the Bi2WO6/Bi4V2O11 heterojunction, which can be verified by photocurrent and photoluminescence measurements. In contrast with pristine Bi2WO6 and Bi4V2O11 samples, the Bi2WO6/Bi4V2O11 heterostructured photocatalyst displays drastically improved photocatalytic Cr(VI) reduction activity under visible-light irradiation. More significantly, the as-fabricated heterojunction possesses superior activity for Cr(VI) relative to the counterpart obtained by mechanical mixing, indicating that the interfacial contact plays a determinant role in promoting charge carrier transfer. Moreover, Bi2WO6/Bi4V2O11 heterojunctions exhibited good cycling stability even after 5 cycles. A plausible photocatalytic Cr(VI) reduction reaction mechanism over the Bi2WO6/Bi4V2O11 heterojunction is proposed on the basis of band alignment. This work reports a high-efficiency photocatalyst for Cr(VI) and might shed light on the decisive factor for optimizing the heterostructure.
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高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 10
·303
·
IF 3.553
Haijiao Lu,Jingkang Wang,Hongxun Hao,Ting Wang
With a large specific surface area, high reactivity, and excellent adsorption properties, nano zerovalent iron (nZVI) can degrade a wide variety of contaminants in wastewater. However, aggregation, oxidation, and separation issues greatly impede its wide application. In this study, MoS2/Fe3O4/nZVI nanocomposites were successfully synthesized by a facile step-by-step approach to overcome these problems. MoS2nanosheets (MNs) acted as an efficient support for nZVI and enriched the organic pollutants nearby, leading to an enhanced removal efficiency. Fe3O4nanoparticles (NPs) could not only suppress the agglomeration and restacking of MNs, but also facilitate easy separation and recovery of the nanocomposites. The synergistic effect between MNs and Fe3O4NPs effectively enhanced the reactivity and efficiency of nZVI. In the system, Cr(VI) was reduced to Cr(III) by nZVI in the nanocomposites, and Fe2+produced in the process was combined with H2O2to further remove 4-Chlorophenol (4-CP) through a Fenton reaction. Furthermore, the nanocomposites could be easily separated from wastewater by a magnet and be reused for at least five consecutive runs, revealing good reusability. The results demonstrate that the novel nanocomposites are highly efficient and promising for the simultaneous removal of Cr(VI) and 4-CP in wastewater.Keywords:nZVI;modification;nanocomposites;Cr(VI);4-CP;Fenton reaction;pollution treatment;recyclability;wastewater
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DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 6
·2049
·
IF 3.748
Xiaojian Zhou,Xiaozhen Zhang,Chunhai Zou,Renhua Chen,Lanlan Cheng,Botao Han,Huafeng Liu
Rutile TiO2pigments codoped with chromophore ion Cr3+and various charge-balancing ions (i.e., counterions species of Sb, Nb, W and Mo) were prepared by a solid-phase reaction method. The effects of the counterions and calcination temperatures on the phase structure, color-rendering and spectroscopic properties, microstructure, and stability of the synthesized pigments were investigated in detail. The results showed that the introduction of 5–10% counterions improved the solubility of Cr3+in the TiO2lattice to form the single-phase rutile pigments calcined at 1100 °C for 2 h. The 10% Cr-doped pigment showed a dark brown color. Depending on the content and type of counterions, the color of the codoped pigments was tailored from yellow to reddish or yellowish-orange to black with different brightness and hue. The influence mechanism of counterions was ascribed to the lattice distortion and variation in the charge balance condition. It was found that the addition of Sb, Nb, or Mo resulted in a remarkable improvement in the NIR reflectance of pigments. The grain growth was inhibited with the codoping of Cr/Sb and Cr/Nb to achieve the nano-sized pigments. In addition, the prepared pigments exhibited good acid and alkali corrosion resistance as well as excellent stability and coloring performance in transparent ceramic glazes.
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DOI
高影响因子
Journal of Advanced Dielectrics
·
2018
·
IF 0
Yi Tang,Chenhui Yang,Wenxiu Que
Herein, we report on a novel two-dimensional (2D) material application, which shows that an accordion-like layered Ti 3 C 2 nanomaterial (MXene) with an excellent adsorption capacity of Cr(VI) from aqueous solution was prepared by etching Al layer from Ti 3 AlC 2 phase in hydrofluoric acid (HF) solution. Ti 3 C 2 nanopowders were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the physical property of as-obtained samples was studied by UV–Vis diffuse reflectance spectra (DRS). After HF treatment, Ti 3 AlC 2 not only has a phase transition from one crystal to another, but surprisingly, its microstructure is also undergoing an obvious change. Ti 3 C 2 with product of change possesses an accordion-like multilayer structure, and a relatively higher specific surface area (SSA) than untreated Ti 3 AlC 2 . Then, accordion-like Ti 3 C 2 with a high SSA provides abundant active sites for pollutant removal and functionalization. Accordion-like Ti 3 C 2 nanomaterial exhibits a stable adsorption capacity, and 1 g as-prepared accordion-like Ti 3 C 2 powders can remove about 80 mg potassium dichromate. Therefore, the results suggest that 2D MXenes are promising as an effective nanoadsorbent in heavy metal removal from the wastewater.
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DOI
Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·847-856
·
IF 7.848
Xiaowen Su,Zehua Wang,Yuan Huang,Zhenyu Miao,Shuhua Wang,Jianjun Wang,Xiao Li Zhang,Xiaomin Sun,Hong Liu,Yuanhua Sang
The hazard-free treatment of Cr( vi ) ions is critical in modern industry. Photocatalytic reduction and detoxification are high-potential strategies. Photocatalysts with high efficiency, low cost, environmental friendliness, and easy mass products are required. In this study, we report a facile strategy using triethanolamine (TEOA) as a capping ligand to modify the surface of ZnO nanospheres. The experimental and theoretical results reveal that the presence of TEOA on the surface was beneficial for electron enrichment on Zn and hole transfer to TEOA and can photocatalytically reduce Cr( vi ) by almost 100% in 5 min. The photocatalytic property of TEOA-modified ZnO could be renewed by the reabsorption of TEOA in solution. The great sedimental properties benefit photocatalyst recycling and renewal, which also provides high potential for water pollution and environmental emergency responses applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ruixin Yan,Xiuping Feng,Long Kong,Qun Wan,Weilin Zheng,Takeshi Hagio,Ryoichi Ichino,Xinde Cao,Liang Li
Hexavalent Chromium (Cr(VI)) in water is a public health concern and has been a challenging research subject in environmental field for many years. Herein, a novel composite material consisting of amorphous iron sulfides supported on hydrotalcites (FeS/HTs) was synthesized by “calcination-reconstruction-calcination” process, which enables homogeneous distribution of iron and sulfur on the surface of hydrotalcites (HT). The composite (mass ratio of FeS/HT was 1/2) could effectively remove over 98% of Cr(VI) within 10 min. A pseudo-second-order kinetic model and a Langmuir isotherm model were well fitted the sorption data with a maximum removal capacity of 206.2 mg/g. The superior adsorption capacity of FeS/HTs could be attributed to the combination of the advantages of abundant adsorption sites on HT and powerful reduction properties of iron sulfides. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis suggested the adsorbed Cr(VI) on the surface and interlayer of FeS/HTs had been reduced to Cr(III) by reductant iron and sulfur. This study demonstrated that FeS/HTs has potential application prospects in Cr(VI) removal.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 11
·5749-5759
·
IF 2.936
Pingfan Xu,Siyi Huang,Yuancai Lv,Yi Chen,Minghua Liu,Haojun Fan
To solve the problem of contamination of hexavalent chromium (Cr(VI)), visible-light-driven graphene-based ternary metal chalcogenide nanosheets (rGO/SnIn4S8) were synthesized via a one-pot surfactant-assisted hydrothermal method for the photoreduction of Cr(VI). Characterizations demonstrated that SnIn4S8 nanosheets were uniformly distributed on the surface of rGO and the as-synthesized nanosheets exhibited excellent photocatalytic activity under visible light. In addition, the effects of pH, concentration of critic acid, holes and electron scavengers on the reduction of Cr(VI) were systematically investigated. It was found that 50 mg L−1 of Cr(VI) could be completely removed within 30 min at pH 2 when citric acid served as a hole scavenger. Kinetic studies showed that the photocatalytic reduction of Cr(VI) processes obeyed the pseudo first order model. Further study indicated that the Cr(III) species was immediately adsorbed onto the surface of the rGO/SnIn4S8 nanosheets after photocatalytic reduction of Cr(VI). Additionally, recycling results suggested that rGO/SnIn4S8 nanosheets possessed high recycle ability and stability after repeated use (5 times). This effective and promising work might provide a new strategy for the photoreduction of Cr(VI) and complete removal of chromium from effluent through the novel photocatalyst rGO/SnIn4S8.
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Xiaofang Liu,Hu Pan,Heng Zhang,Hu Li,Song Yang
Enlarging the dispersed micropores of metal-organic frameworks to the well-ordered mesostructure can enhance the accessibility of acidic sites for reactants resulting in the improvement of selectivity. With the regulation of cetyltrimethylammonium bromide/Cr3+ and ClSO3H sulfonation, a series of mesoporous MIL-101(Cr)-SO3H (MMSs) with multiple pore sizes and acidic properties were synthesized and explored to further facilitate the furfuryl alcohol (FA) ethanolization to ethyl levulinate (EL) for the first time. The optimal catalytic activity of 83.8% EL yield at full FA conversion demonstrated that the appropriate mesopore size, acidic density, and accessible −SO3H sites contributed to the superior performance of the MMS(0.3)-0.15. The turnover frequency value (14.8 h–1) obtained with MMS(0.3)-0.15 was comparable to the commercial Nafion NR50 (18.3 h–1) and much higher than the classical Amberlyst-15 (1.9 h–1), confirming the predominant catalytic performance. Furthermore, two coexistent reaction paths with 2-ethoxymethylfuran and 4,5,5-triethoxy-pentan-2-one as intermediates indicated the possibility of producing EL from FA.
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高影响因子
危险品化学品经营许可证（带存储）