BIOMASS & BIOENERGY
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2014
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IF 3.411
Shams Ali Baig,Jin Zhu,Niaz Muhammad,Tiantian Sheng,Xinhua Xu
Magnetic biochar is increasingly known as a multi-functional material and the appropriate synthesis method further increase its efficient applications. In this study, the effects of synthesis methods on the fabrication of Kans grass straw/biochar (KGS/KGB) with Fe 3+ /Fe 2+ by chemical co-precipitation and subsequently pyrolyzing at 500 °C for 2 and 4 h were studied in details, and compared their As(III, V) adsorption potentials under different operating conditions. Magnetic biochars (MKGB3 and MKGB4) prepared from KGS revealed of superior Fe 3 O 4 loading, higher As(III, V) adsorption efficiency and saturation magnetization (45.7 Am 2 kg −1 ) than that of KGB (MKGB1 and MKGB2). Moreover, Thermogravimetric analysis (TGA) demonstrated three stages of decomposition and the MKGB3 and MKGB4 generated higher residual mass (>60%) at stage 3 (1000 °C) due to greater Fe 3 O 4 composite in biochar matrix and turned to be thermally more stable. As(III) and As(V) adsorption equilibrium data well fitted in Langmuir model and followed the order: MKGB4 > MKGB3 > MKGB2 > MKGB1. The maximum As(III) and As(V) adsorption capacities were about 2.0 mg g −1 and 3.1 mg g −1 , respectively. The data best fitted in pseudo-second-order ( R 2 > 0.99) rather than pseudo-first-order kinetics model indicating of more complex mechanism. The adsorption of As(III) and As(V) was found to decrease with increasing in ionic strength of competing ions and PO 4 3− was found to strongly inhibit arsenic adsorption. Highest desorption was achieved at pH 13.5 using NaOH. This study suggests that selective adsorbent synthesis method could be useful to prepare effective adsorbent for toxic metals immobilization .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Mengqi Bian,Rui Liu,Qinghai Zhang,Yunlong Qu,Guanghui Chen,Jihai Duan,Hui Zhao,Weiwen Wang
The one-step preparation of methacrylic acid from isobutylene presents a significant challenge. In this study, three-dimensionally ordered macroporous (3DOM) Mo-V-P-Ce was synthesized using the hard template method and employed as a carrier for heteropolyacids in the selective oxidation of isobutene (IBN) to produce methacrylic acid (MAA). The CuNH 4 PAV@3DOM Mo-V-P-Ce catalyst developed through this method exhibits an ordered macroporous structure, which significantly enhances its thermal stability. Additionally, it contains a significant number of active species (VO 2 + ) and appropriate moderately strong acidic centers, which collectively improve the overall performance of the catalyst. The combination of CuNH 4 PAV with the 3DOM structure increases the surface concentration of oxygen vacancy species, thereby promoting the catalytic activity of the composite catalyst in converting these oxygen vacancy species into lattice oxygen species. Notably, the selectivity of the synthesized heteropolyacid catalysts for MAA increased to 84 % after loading. This work offers a novel approach to the development of efficient catalysts.
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ACTA MATERIALIA
·
2024
·
IF 8.3
Jinping Mu,Xiaohui Li,Rui He,Lijing Sun,Xue Bai,Lihui Zhang,Xi Zhang,Zhenfa Liu,Jing Gao,Aijia Wei
High-voltage (5-V) lithium–ion batteries (LIBs) have garnered substantial interest due to their superior energy density. Nevertheless, the unstable interphase of high-voltage LIBs can cause electrolyte decomposition, electrode collapse, transition metal dissolution, and lithium dendrite growth during cycling, which impedes their widespread commercial use. To mitigate these challenges, various alkali-metal phosphates were incorporated into a carbonate-based electrolyte as film-forming additives, aiming to improve the electrochemical performance of LiNi 0.5 Mn 1.5 O 4 (LNMO)-based LIBs. Following a detailed comparison of the electrochemical performances of various alkali-metal phosphates, KH 2 PO 4 and NaH 2 PO 4 were selected for an in-depth investigation in this research. The highly protective passivation film generated by KH 2 PO 4 and NaH 2 PO 4 on the electrode surface provided significant protection by effectively inhibiting continuous electrolyte decomposition. This finding was supported by density functional theory calculations and a variety of electrochemical and characterization tests. The H 2 PO 4 − primarily contributed to the formation of the cathode electrolyte interphase film on the cathode surface. KH 2 PO 4 (via the electrostatic shielding effect of K + ions) and NaH 2 PO 4 (through the co-precipitation of Na + and Li + ions) both effectively inhibited the growth of lithium dendrites on the lithium metal anode. Additionally, the KH 2 PO 4 and NaH 2 PO 4 additives regulated the amount of HF in the electrolyte through acid–base equilibrium reactions. The electrolytes containing additives significantly enhanced the electrochemical performances of Li||Li, LNMO/Li, LNMO/graphite, and LNMO/Li 4 Ti 5 O 12 cells. LNMO/Li half-cells with standard electrolyte (STD) supplemented with KH 2 PO 4 and NaH 2 PO 4 additives demonstrated capacity retentions of 92.9 % and 90.0 % after 500 cycles at 5 C, respectively, in contrast to only 79.4 % for the STD electrolyte alone. Furthermore, the LNMO/graphite full cell exhibited an increased capacity retention, reaching 81.1 % (STD+KH 2 PO 4 ) and 78.29 % (STD+NaH 2 PO 4 ), up from 70.8 % with the STD, after 100 cycles at 0.5 C. Given their ease of use, affordability, and widespread availability, KH 2 PO 4 and NaH 2 PO 4 additives show significant potential to enhance the electrochemical properties of high-voltage LIBs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chengfang Zhang,Zhenyu Song,Chao Li,Qinglong Liu,Jingchun Tang
In the actual polluted environment, the composite pollution system was usually composed of heavy metals and organic pollutants, especially Cr(VI) and chlorophenols often co-existed in industrial wastewater. In this study, a composite material consisting of multilayer graphene carbon shells coated with nZVI (gBC@nZVI) with various excellent properties was applied to deal with the composite system of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) coexisting in the wastewater, and the intrinsic mechanism for the simultaneous removal of heavy metals and organic pollutants was systematically investigated. The results showed that in the composite pollution system (Cr(VI) = 20 mg/L, 2,4-DCP = 15 mg/L), complete removal of Cr(VI) could be achieved in 60 min, while 2,4-DCP achieved 95.2 % removal, with the contribution of oxidative degradation being 76.4 %. It was found that during the efficient adsorption and reduction of Cr(VI) by gBC@nZVI, the generation of the metastable intermediate Cr(V) was verified by probe compounds, electron spin resonance and UV–visible spectroscopy, and further experiments demonstrated that the generation of •OH was closely related to Cr(V) and promoted the oxidative degradation of the coexisting 2,4-DCP. Quenching experiments with the addition of specific scavengers indicated that •OH was the active species directly dominating the oxidative degradation of 2,4-DCP, whereas Cr(V) was indirectly involved in the degradation of 2,4-DCP by promoting the generation of •OH. In addition, the increase of solution pH negatively affected the degradation of 2,4-DCP in the composite polluted system, mainly due to the hindered generation of •OH in the alkaline environment. This work provided theoretical support for the promising application of gBC@nZVI in real environments contaminated with a combination of Cr(VI) and chlorophenols.
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POLYMER DEGRADATION AND STABILITY
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2025
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IF 7.4
Xiaoyu Zhang,Bo Liu,Shanzhe Li,Chunling Zhang
It is of great significance to enhance the fire safety of epoxy resins (EP), especially to reduce the release of heat and smoke. Therefore, in this work, flame retardants PNIM and PNDA were prepared and introduced into EP to achieve the effective suppression of heat and smoke. EP/DDM/PNDA-10 can self-extinguish quickly, achieving the V-0 rating as well as the LOI value of 34.3%. Compared with the Control EP, the peak heat release rate (pHRR), total heat release (THR), and total smoke production (TSP) of EP/DDM/PNDA-10 decreased by 68.7%, 36.2% and 35.7%, respectively. It can be attributed to the P/N synergistic flame retardant effect. During the combustion process, PNIM and PNDA can promote the formation of a dense carbon layer containing phosphorus and nitrogen, retain pyrolysis products in the condensed phase, and simultaneously inhibit the transfer of heat and oxygen. In addition, the PO· and PO 2 · free radicals produced by the decomposition of flame retardants can capture the active free radicals in the air, thereby interrupting the combustion reaction. Simultaneously, non-flammable gases, such as N 2 and NH 3 were released, which diluted the concentration of combustible volatiles and oxygen and enhanced the gas phase flame-retardant effect. Furthermore, EP/DDM/PNIM-10 exhibited excellent mechanical properties, with tensile strength and impact strength increasing by 33.1% and 131.4%. In general, this work provides an approach to developing a phosphonitrile flame retardant with broad applications in high-performance EP.
研究领域:
高分子科学
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材料工程
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消防安全工程
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化学合成
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Xinning Dai,Zhujun Liu,Hongwei Li,Ke Zhang,Haoyu Wang,Dandan Ma,Wei Chen
An S-O v co-modified double defects photocatalyst (S 10 % -ZnO ov ) for efficient degradation of pollutants in the water environment was fabricated by introducing S and O v into ZnO through simple hydrothermal procedures. The prepared S 10 % -ZnO ov exhibited enhanced photoactivity (major pollutants degradation within 60 min) and double defects synergistic co-promotion in the photocatalytic system. Experiments, characterization, and DFT calculations confirmed that the introduced S-O v double defects not only provided stable and efficient electronic channels for electron transfer on the material surface (promoting the separation and transfer process of charges), but also provided abundant active sites (facilitated adsorption and oxide process of H 2 O and O 2 molecules) for the surface catalytic process, which achieved the enhancement of photocatalytic performance and promoted the generation of ROS (H 2 O 2 , ·OH and O 2 ·- ). This study revealed the synergistic mechanism and catalytic properties of the double defects, providing a new idea for the development of highly active photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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化学
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TALANTA
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2025
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IF 6.1
Zhenxing Guo,Fang Xu,Longfei Su,Qiang Cheng,Liqiang Xu,Guoping Sheng
Fluorescence methods hold great potential for arsenate (As(V)) detection in food safety. However, the development of environmentally friendly and sustainable fluorescence indicators remains at an early stage. Herein, we develop a novel fluorescence sensing platform for As(V) detection. Curcumin (Cur), a plant-derived, non-toxic, and environmentally friendly food additive. Owing to its excellent fluorescent properties, it was used as a green fluorescent indicator in this study. Cerium dioxide nanoparticles (CeO 2 NPs) were synthesized via a green hydrothermal method and then assembled with Cur to form the CeO 2 @Cur fluorescent probe. The detection of As(V) was achieved through an adsorption-desorption mechanism, where As(V) displaces Cur from the CeO 2 surface, thereby restoring its fluorescence. Based on this mechanism, the probe exhibited a linear response (R 2 = 0.991) to As(V) concentrations within the range of 0.10-30.00 μM, with a low detection limit of 25.83 nM. Furthermore, by integrating smartphone-based RGB analysis of fluorescence images, a portable platform was constructed for the on-site detection of As(V). This work thus offers a promising strategy for sustainable and practical solution for As(V) detection in food and environmental samples.
研究领域:
环境科学
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分析化学
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食品安全
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纳米技术
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传感技术
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Food Chemistry-X
·
2025
·
IF 8.2
Zhijie Zhu,Xinxin Ma,Xinyue Pan,Xianfeng Du,Xu Chen
In this study, V-type wheat starch-tea polyphenols complexes (VS-TP) were used to improve the digestive properties and quality characteristics of steamed cold noodles. With TP content increasing from 2.5 % to 10.0 %, the storage modulus of VS-TP complexes decreased from 580.59 to 1341.85 Pa to 379.90–859.61 Pa, likely due to TP disrupting starch chain entanglement via noncovalent interaction (hydrogen bonds and CH–π bonds). TP also enhanced both short-range and long-range ordered structures of V-type starch, and the complexation index rose from 23.76 % to 84.61 % as TP content increased. Notably, the VS-10 %TP group showed a 47.28 % higher resistant starch content than the control group, which may be attributed to TP-V-type starch interactions and TP's amylase inhibition. However, the lightness, hardness, and gumminess of the steamed cold noodles decreased by 7.84 %, 51.46 %, and 49.84 % when adding 10 %TP. Balancing functionality and quality, 5 %TP was optimal for preparing low-digestibility steamed cold noodles with excellent textures.
研究领域:
食品科学
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碳水化合物化学
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功能食品
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淀粉技术
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·18940-18949
·
IF 10.733
Xiaohao Liu,Linbin Tang,Zhi Li,Jianhua Zhang,Qunjie Xu,Haimei Liu,Yonggang Wang,Yongyao Xia,Yuliang Cao,Xinping Ai
The low energy density and the unsatisfactory cycling stability of cathode materials in sodium-ion battery systems have restricted their wider application. Here, a representative high voltage cathode of Na4Co3(PO4)2P2O7 (NCPP) was modified through Al doping. The as-prepared Na3.85Co2.85Al0.15(PO4)2P2O7 (Al0.15-NCPP) can deliver a discharge capacity of 99.5 mA h g−1 at 0.5C. A superior rate capability (80.3 mA h g−1 at 20C and 73.4 mA h g−1 at 50C) as well as excellent ultralong cycling stability (96.3% capacity retention after 900 cycles at 10C and 82.7% capacity retention after 8000 cycles at 30C) can be obtained. The excellent sodium storage properties are benefited from the advantages of Al doping. Al doping not only enhances ionic conductivity, but also improves the structural stability. Al0.15-NCPP, which has outstanding electrochemical properties, has been proposed as a very attractive high voltage cathode material for sodium-ion batteries. More impressively, a full cell assembled with an Al0.15-NCPP cathode and hard carbon (HC) anode exhibits distinguished rate/cycling performances (70.6 mA h g−1 at 30C and 95% capacity retention after 200 cycles at 1C) and an extremely high output voltage of 4.36 V, thus providing a preview of its practical application. In addition, our research can be used to enhance the electrochemical properties of other polyanion-based high voltage electrode materials.
研究领域:
材料科学
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电化学
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Inorganic Chemistry Frontiers
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2025
·
IF 6.4
Wenxuan Zheng,Lin Gao,Mingsong Fan,Zhiyu Dou,Lili Cui,E. Jin
To address the sluggish kinetics and limited current density in the alkaline hydrogen evolution reaction (HER), we designed and synthesized dandelion-like V-doped CoP anchored on carbon cloth (V–CoP-X) via a MOF-derived strategy involving hydrothermal growth and subsequent phosphidation. By precisely controlling the V content in the MOF precursor, we achieve tunable morphologies of V–CoP materials. Experimental analyses reveal that Lewis acid sites of V promote electron transfer and adjust the d-band centers of V–CoP. According to the results of experimental and density functional theory (DFT) calculations, the V-doped CoP lowers the water dissociation energy in alkaline media and optimizes the adsorption energy for H* (ΔGH*). These synergistic effects accelerate water dissociation kinetics as well as optimize adsorption and desorption behavior of H*, leading to improved HER activity in 1 M KOH and 0.5 M H2SO4. As a result, the optimal V–CoP electrode exhibits exceptional HER performance in diverse electrolytes, requiring low overpotentials of 69, 63 and 89 mV to obtain 10 mA cm−2 as well as 212, 254 and 401 mV at 500 mA cm−2 in 1 M KOH, 1 M KOH + 0.5 M NaCl and 0.5 M H2SO4, respectively. Remarkably, V-doped CoP possesses excellent long-term stability at large current density. This work presents a high-performance HER electrocatalyst while providing fundamental insights into the role of V doping in enhancing reaction kinetics.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Yun Guo,Hong-Yi Li,Shuo Shen,Jie Cheng,Jiang Diao,Bing Xie
Chromium sludge is a hazardous solid waste which cannot be effectively treated but only piled up and abandoned, causing serious environment pollution and resource wasting. This work proposes an effective novel process to separately recover all resources in chromium sludge via a sustainable way. The obtained acid solving liquid from chromium sludge is desiliconized by cationic flocculant (PCAM) to induce coprecipitation of polysilicate gel and PCAM , which mixture is calcinated to generate the product of white carbon black in purity of 94.35% with a recovery of 92.58%. After desiliconization, V in the solving liquid is selectively extracted by microemulsion (ME), which is recovered as V 2 O 5 in purity of 99.34% with a recovery of 95.53% by the subsequent procedure of stripping-precipitation-calcination. The Fe 3+ in raffinate is reduced to Fe 2+ cations by Na 2 SO 3 , and is then recovered by H 2 C 2 O 4 precipitation to generate the FeC 2 O 4 product in purity of 99.12% with a recovery of 98.25%. Cr 3+ cations in residual solution are recovered by alkaline precipitation and calcination to generate the Cr 2 O 3 product in purity of 98.25% with a recovery of 92.68%. This work provides fresh penetrations into the synchronous detoxification, resource recovery and value-added utilization of hazardous industrial solid wastes.
研究领域:
环境科学
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材料科学
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化学工程
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Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Song Shipai,Peng Xiang,Huang Kai,Zhang Hao,Wu Fang,Xiang Yong,Zhang Xiaokun
The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 electrodes through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 electrodes was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 electrodes suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 electrodes modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cutoff voltage from 2.75 to 4.5 V vs . Li + /Li and an 84.6% capacity gain at 5 C comparing with the pristine one.
研究领域:
材料科学
·
电化学
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高影响因子
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