Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Liping Zhang,Hexia Yuan,Yiyun An,Huitong Li,Yiqing Gao,Huaran Sun
Coking reverse osmosis concentrated water contains refractory organic pollutants . If not treated, it will generate hazardous solid waste that cannot be utilized in the subsequent evaporation and crystallization process . In order to effectively remove organic substances from coking reverse osmosis concentrated water, Ti/PbO 2 electrode, Ti/Ce,Nd-PbO 2 electrode, and Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were prepared. The electrodes were characterized by scanning electron microscopy, X-ray diffraction spectroscopy, and X-ray photoelectron spectroscopy, revealing that the average crystal grain size of lead dioxide on the surface of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode is 29.58 nm. The electrochemical performance of the electrodes was tested using cyclic voltammetry and electrochemical impedance spectroscopy , which showed oxidation peaks at 1.37 V, 1.81 V, and 2.1 V for the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode, with a charge transfer resistance of 56.34 Ω. Accelerated life test indicated that the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode has an accelerated lifespan of 1050 min. The effects of interelectrode distance, pH value, current density , and other factors on the electrocatalytic oxidation of 3,5-di-tert-butylphenol by the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were investigated, achieving a removal efficiency of 98.67 % under optimal conditions. Performance analysis of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode demonstrated good stability. Treatment of actual coking reverse osmosis concentrated water using the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode resulted in removal efficiencies of 87.76 %, 47.92 %, and 77.42 % for COD , TOC, and UV 254 , respectively. The current efficiency and energy consumption of electrocatalytic degradation of coking reverse osmosis concentrated water were 9.38 % and 0.15 kWh/g COD. This study provides a better treatment solution for the degradation of organic matter in coking reverse osmosis concentrated water.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
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IF 2.758
Ting Wang,Ting Xu,Shang Gao,S.-H. Song
BiFeO 3 , BiFe 0.95 Nb 0.05 O 3 and Bi 1− x Nd x Fe 0.95 Nb 0.05 O 3 ( x =0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles are successfully synthesized via a tartaric acid-assisted sol-gel technique for the first time. The effect of Nd and Nb co-doping on the structure, morphology, and magnetic and optical properties is investigated. X-ray diffraction (XRD) and Raman measurements demonstrate that Nd 3+ ions and Nb 5+ ions co-doping at A and B-sites of BiFeO 3 can result in a structural transformation (from single rhombohedral phase ( R 3 c ) to two coexisting phases ( R 3 c and Pbam)). The morphology of the nanoparticles seems to be approximately cubic, and by the co-doping, the size of the nanoparticles decreases from ~132 to ~35 nm. Notable improvement in the remanent magnetization of the sample with x =0.15 is observed with a value of 0.285 emu/g, being 20 times higher than that of the undoped sample (BiFeO 3 ). A decrease in the optical band gap is also observed in the Nd and Nb co-doped nanoparticles, indicating their favorable potential in photocatalytic applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 16
·13271-13289
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IF 2.779
Yu Xiaochen,Song Zeyu,Dong Xiaoqian,Li Huajian,Liu Haonan,Zhao Baoyan,Ye Ting,Jiang Yinlin,Li Xiaojie,Duan Li,Fan Jibin,Zhao Peng
g-C 3 N 4 and rare earth (RE)-doped (Yb, Nd and Ce) g-C 3 N 4 nanosheets were synthesized by a thermal method. The remarkable effects of RE doping on the structural, morphological, and optical properties of g-C 3 N 4 were investigated using XRD, FT-IR, SEM, BET, XPS, UV–Vis, PL, EIS and Mott–Schottky characterization techniques. The photocatalytic activities of RE doped g-C 3 N 4 nanosheets for different dyes were improved compared with g-C 3 N 4 under visible light irradiation, among which Ce/g-C 3 N 4 showed outstanding performance. Due to the doping of RE, it modulates the electronic structure of pristine g-C 3 N 4 and broadens its optical absorption range. In addition, a possible mechanism of photocatalytic degradation of dyes was propounded by free radical trapping experiments. This work may provide a reference for the rational design of photocatalysts and inspiration for the photocatalytic mechanism.
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Nuclear Engineering and Technology
·
2022
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IF 2.817
Yan Wang,Jin Wang,Xue Zhang,Nan Li,Junxia Wang,Xiaofeng Liang
Series of unequal quantity Nd/Ce co-doped ceramic nuclear waste forms, (Gd, Nd) 2 (Zr, Ce) 2 O 7 , were prepared to tailor its ordered pyrochlore or disordered fluorite structure. The phase transition, microtopography, and elemental composition of the ceramic samples were systematically investigated, especially the effect of order-disorder structure on the chemical stability. It was confirmed that unequal quantity of Nd/Ce could synchronously replace the Gd/Zr-sites of Gd 2 Zr 2 O 7 . And the phase transition of order-disorder structure could be successfully tailored by regulating the average cationic radius ratio of (Gd, Nd) 2 (Zr, Ce) 2 O 7 series. The elements of Gd, Nd, Zr, and Ce are uniformly distributed in the ordered or disordered structures. The MCC-1 leaching results showed that (Gd, Nd) 2 (Zr, Ce) 2 O 7 pyrochlore ceramic nuclear waste forms had excellent chemical stability, whose elements' normalized leaching rates were as low as 10 −4 -10 −7 g‧m −2 ‧d −1 after 7 days. In particular, the chemical stability of disordered structure was superior to that of ordered structure. It was proposed that the force constant and the closest packing were changed with the structure transformation resulting the chemical stability difference.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 39
·395703
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IF 3.874
Zhihua Li,Xin Ding,Bing Yu,Yu Min,Bin He,Youqing Shen,Hailin Cong
Near-infrared (NIR) emission materials can be widely applied in various fields, such as food detection, imaging, treatment, electronic products. With the trend of miniaturization of equipment, smaller materials are needed. In this work, we successfully synthesized a series of M2Ga2GeO7:N3+ (M = Ca, Ba, Sr; N = Cr, Nd, Er) samples and then focused on the study of Nd3+ doped Sr2Ga2GeO7 (SGGO). A series of SGGO:xNd3+ sub-micron phosphors were prepared via a microwave-assisted sol–gel process combined with subsequent calcination at 750 ℃, and the structural information and luminescent properties were systematically studied. SGGO is a representative tetragonal crystal and belonging to the space group of P4¯21m (113). The Nd3+ ions occupy eight-coordinated Sr2+ sites in the crystal lattice. From SEM analysis, the average particle size distribution is 219.7 ± 41.4 nm. The sub-micron phosphors have rich excitation spectra ranging from 350 nm to 850 nm and can produce multiband NIR emissions of 1331, 1056, and 905 nm when excited by ultraviolet and NIR light. The maximum emission intensity was obtained by optimizing the doping ratio of Nd3+ ions. A commercial chip was then utilized to fabricate light-emitting diodes (LEDs) to verify its application potential in NIR-II mini-LEDs. Compared with blue light LEDs, the as-prepared LEDs had good imaging penetration depth and could be clearly observed under 10 mm of chicken breast coverage. The maximum imaging penetration depth can be 33 mm.
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PubMed
高影响因子
SOLVENT EXTRACTION AND ION EXCHANGE
·
2021
·
IF 2.513
Yifu Hu,Chuan Lu,Qi Chen,Yaoyang Liu,Yu Zhou,Caishan Jiao,Meng Zhang,Hongguo Hou,Yang Gao,Guoxin Tian
In this paper, pertraction of Nd(III) and U(VI) from nitric acid media through a flat-sheet supported liquid membrane (FSSLM) was studied by using a self-made liquid membrane device, respectively, with N, N’-dimethyl-N, N’-dioctyl-3-oxadiglcolamide (DMDODGA) diluted in 40/60 (V/V)% n-octanol/kerosene as the carrier. The effects of various factors, such as the acidity of the feed and stripping phases, neodymium concentration, uranium concentration, DMDODGA concentration are discussed. The optimized conditions for Nd(III) transport were found to be 3 M HNO3 in the feed phase, 0.5 M HNO3 in the stripping phase, 0.48 M DMDODGA in n-octanol/kerosene as the carrier. When the initial concentration of Nd(III) was 1 × 10−4 mol/L, the transport rate of Nd(III) was 86.4(±2.2)%. Compared with Nd(III), the liquid membrane was less effective in the transport of U(VI), the highest transport rate of U(VI) was 57.2 (±2.6)%.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yu Han,Jingkai Nie,Xiaochuan Huang,Xuan Li,Shaofeng Zhang,Zhen Xu,Donghui Wang,Qiang He,Jian Zhou,Ran Xu
The tungsten-bronze-type Ba 6-3x Sm 8+2x Ti 18 O 54 ceramic materials exhibit fantastic application potential in electronic devices owing to their superior microwave dielectric properties. However, the huge challenge of realizing high dielectric constant accompanied by ultralow dielectric loss still exists and has become a critical bottleneck impeding the operation of multilayer ceramic capacitors (MLCCs) and capacitive voltage dividers in the low-frequency range. Herein, we report high dielectric constant and ultralow dielectric loss performance of Ba 4 (Sm 1-x-y Bi x Nd y ) 9.333 Ti 18 O 54 (0.3≤x ≤ 0.4, 0.1≤y ≤ 0.2) ceramics via A-site modification strategy of Bi/Nd co-substitution. A high dielectric constant of 115 and ultralow loss tangent of 0.003 at 1 kHz are achieved simultaneously in Ba 4 (Sm 1-x-y Bi x Nd y ) 9.333 Ti 18 O 54 ceramics with x = 0.4 and y = 0.2. Incorporating an appropriate amount of Bi 3+ ions contributes to enhancing the dielectric polarizability of the crystal lattice, and greatly strengthening the sintering ability of ceramics as well as local distortion characteristics, leading to an improvement in the dielectric constant and ultimately a deterioration in the loss tangent, which is confirmed by XRD, Raman, SEM and Impedance spectroscopy. The Bi/Nd co-substitution has a significant impact on further improving the dielectric constant, and the compensation of the loss tangent value mainly is derived from the conduction loss with the reduction of leakage currents. Moreover, the high recoverable energy density of 1.2 J/cm 3 and energy efficiency of 87%, as well as excellent temperature (25∼180 °C) and frequency (1∼140 Hz) stability, are obtained in this ceramic owing to high breakdown strength via A-site modification strategy of Bi/Nd co-substitution. These findings establish an effective strategy of Bi/Nd co-substitution to develop highly reliable Ba 4 Sm 9.333 Ti 18 O 54 ceramics, opening a new path for creating next-generation dielectric materials tailored for stable energy storage in high-voltage, low-frequency electronics.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kasi Gopinath,Sathishkumar Gnanasekar,Khalid A. Al-Ghanim,Marcello Nicoletti,Marimuthu Govindarajan,Ayyakannu Arumugam,Chinnasamy Balalakshmi,Sarinthip Thanakkasaranee
In the present study, Neodymium (Nd), Cadmium (Cd), and the various molar ratios of Nd: Cd doped copper oxide nanocomposites (CuO NCs) were prepared by the co-precipitation method. The as-synthesized Nd, Cd, and Nd:Cd doped CuO NCs [Cu 1-x + y Nd x Cd y O, (x:y = 0.006:0.00, 0.00:0.006, 0.005:0.001, 0.004:0.002, 0.003:0.003, M)] were characterized through various instrumentation techniques such as TGA , UV–Vis–NIR, FTIR, Raman, FL, XRD , ZP , FE-SEM with EDAX elemental mapping, HR-TEM and XPS analyses. Further, the antibacterial activity of doped CuO NCs was tested against Staphylococcus aureus and Escherichia coli . An equal molar ratio of Nd and Cd doped CuO NCs showed excellent antibacterial activity mainly due to the synergistic effect of sufficient Nd 3+ , Cd 2+ , and Cu 2+ ions releasing ability . Interestingly, the doping effect enhances surface defects and decreases the ability to scavenge free radicals compared to pure CuO nanomaterials . At the same time, the cytotoxicity of NCs was evaluated on the human lung epithelial L132 cell line. Evidently, 75 μg/ml concentration of Nd:Cd doped CuO NCs samples shows 80% viability, which confirms their negligible cytotoxic effect. The Nd:Cd doped CuO NCs (94:3:3) had a high aspect ratio shape, remarkable ion-releasing ability, and biocompatibility while being thermally stable. Because of these qualities, they are well suited for treating bacterial infections in the biomedical area.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Luo Feng,Liqing Li,Meiqi Zhang,Yijie Yang,Xiaoqi Sun
This paper reports the syntheses of a series of polychromatic pigments with the general formula LiAl 1- x M x (MoO 4 ) 2 (M = Fe, Pr, Ho, Nd, Er, Ce; x = 0–0.4) and the characterization of near-infrared reflectance properties. The synthesized pigments exhibited green (Pr), lavender (Nd), pink (Er) and different yellows (Fe, Ho, Ce). The XRD patterns of typical LiAl 1- x Fe x (MoO 4+δ ) 2 samples show that the prepared samples are triclinic lithium aluminum molybdate structures with space group P -1.The iron in the sample mainly existed in the form of Fe 3+ , which led to the directional growth of grains with different morphologies. The near-infrared solar reflectance (R*%) of LiAl 1- x Fe x (MoO 4 ) 2 pigments reached 94.19%. As the doping concentration of rare earth was increased, the color of the pigments gradually deepens. By introducing rare earth elements Pr, Ho, Nd, Er, and Ce into the LiAl(MoO 4 ) 2 matrix, the color of the pigment was successfully changed from white to green, lavender, pink, and yellow, indicating that doping can control the color of the pigment. Moreover, the prepared pigments had high R*% (>87%), indicating that the pigment samples have excellent thermal insulation properties and can be used as a new type of reflective thermal insulation coatings.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Siqi Zhang,Shuopan Dun,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) or fabricating TiO 2 hollow spheres (TiO 2 -HSs) are considered two feasible strategies to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). However, studies investigating a combination of UCNPs and TiO 2 -HSs for the application in DSSCs are still scarce. In this contribution, NaYF 4 :Yb,Er@NaGdF 4 :Nd@SiO 2 UCNPs and TiO 2 -HSs were synthesized and respectively applied as upconversion layers and scattering layers on the TiO 2 photoanode of DSSCs. The influence of different doping ratios of UCNPs on cell performance was explored. The present results reveal that the DSSCs device based on conventional P25 photoanode films incorporating the UCNPs with 10% can achieve a photovoltaic efficiency of 6.65%, showing 29.63% enhancement in comparison to the device without UCNPs. When the TiO 2 -HSs are used as scattering layers above the P25 film, the DSSCs device obtains a higher photovoltaic efficiency of 6.97%. More importantly, combining the UCNPs and TiO 2 -HSs can further enhance the photoelectrical property of DSSCs, realizing an optimal efficiency of 8.17%. Such an improvement can be attributed to a synergistic mechanism arising from the upconversion effect of UCNPs and the light scattering effect of TiO 2 -HSs. This work opens a new way of preparing composite photoanode films to improve the photovoltaic performances of DSSCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Rongxin Lin,Faguang Ma,Wendong Xing,Jianming Pan
Three-dimensional (3D) basswood materials, for the first time, were successfully used for the construction of rare-earth Nd(III)-imprinted nanocomposite membranes. Herein, polydopamine (PDA)-modified layers could be initially synthesized on basswood surfaces. After the double-bonded modification procedure, the 3D wood-based ionic imprinted membranes (3DW-IIMs) system was finally accomplished by developing a re-modified two-step-temperature free radical polymerization process. The as-design PDA@basswood surface structure was first proposed and applied as imprinting-initiated factors for the preparation of Nd(III)-imprinted sites. Importantly, excellent rebinding capacity (120.87 mg g −1 ), adsorption kinetics and permselectivity coefficients (more than 10) were achieved successfully. Furthermore, an important research result had also been found that the PDA-modified layers caused significant promotions to the rebinding capacities of the as-prepared 3DW-IIMs, that is to say, more and more Nd(III)-imprinted sites could be synthesized because of the PDA-modified surfaces. The as-obtained selective rebinding and separation results together with the green natural wood-based materials strongly demonstrated that our synthesis methodology of 3DW-IIMs had great potential for applications in various fields of rare earth separation, chemical industry, and environment protection.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chao Zhu,Futao Li,Shaowen Ji,Zhengyan Li,Xiangping Chen
Recycling valuable metals from spent nickel-metal hydride (NiMH) batteries has significant environmental and economic benefits. This study aimed to separate and recover nickel (Ni), cobalt (Co), cerium (Ce), lanthanum (La), and neodymium (Nd) from waste NiMH batteries using ion-exchange fibers as the adsorbent material in an adsorption chromatography process. Static adsorption experiments showed the metal adsorption processes followed the Langmuir model, indicating mono layer coverage, and quasi-second order kinetics, suggesting chemisorption. In the chromatographic separation study, optimal conditions of pH 2, 1/10 diluted feed solution, fully packed column, 3 mL/min flow rate, and 0.2 mol/L acid elution enabled effective separation of the five metals. According to distribution coefficients, the metals were preferentially adsorbed in the order: Nd 3+ > La 3+ > Ce 3+ > Co 2+ > Ni 2+ . Transition metals Ni 2+ and Co 2+ were first separated from rare earths Ce 3+ , La 3+ and Nd 3+ . Subsequently, good separation among the rare earth elements was achieved. After ten adsorption-desorption cycles, the fibers maintained excellent stability with only 9.2 % capacity loss. The results demonstrate the adsorption chromatography method can efficiently recover mixed metals from waste NiMH batteries individually for full value utilization.
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