Journal of Materials Chemistry A
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2022
·Vol. 10
·期 35
·18147-18155
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IF 14.511
Jin Li,Kaicai Fan,Hongliang Jiang,Fenghong Lu,Lixiu Cui,Bin Li,Qi Zhang,Gao-Chao Fan,Lingbo Zong,Lei Wang
Fe–N–C single atom electrocatalysts (SAECs) with porphyrin-like Fe–N4 species are one of the most promising alternatives to the platinum-group-metal-based electrocatalysts used for oxygen reduction reaction (ORR). However, limited attention is paid on delicately optimizing the free energy barrier of Fe–N4 active sites through heteroatom doping in the carbon skeleton. Herein, Fe single atoms (SAs) on heteroatoms N- and P-codoped porous honeycomb-like carbon (Fe–N4/NP-PHC) have been rationally designed. The as-developed Fe–N4/NP-PHC catalyst with abundant accessible active sites showed an impressive onset potential (Eonset = 1.0 V) and half-wave potential (E1/2 = 0.89 V) under low electrocatalyst loading capacity, which is more positive than those of Pt/C and most SAECs. Encouragingly, the experimental results and DFT calculations systematically demonstrated that the optimized adsorption energy of the Fe–N4 sites in the P-doped carbon matrix facilitated the release of OH* and thus boosted the ORR performance. The metal–air battery containing Fe–N4/NP-PHC exhibited high peak power density and long-term working feasibility with a low voltage gap at large current densities. This study demonstrates that P doping in carbon matrix is an effective strategy to promote catalytic properties and presents a novel avenue for developing high-performance electrocatalysts for various electrochemical reactions.
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Nanomaterials
·
2022
·Vol. 12
·期 10
·1759
·
IF 5.719
Dazhuang Yu,Tiekun Jia,Zhao Deng,Qichen Wei,Kun Wang,Lihua Chen,Pingping Wang,Jiedong Cui
P-doped graphitic carbon nitride tubes (P-CNTS) with different P concentrations were successfully fabricated via a pre-hydrothermal in combination with a calcination process under a nitrogen atmosphere. The as-prepared samples exhibited excellent photocatalytic performance with a hydrogen production rate (HPR) of 2749.3 μmol g−1h−1, which was 17.5 and 6.6 times higher than that of the bulk graphitic carbon nitride (CNB) and graphitic carbon nitride tube (CNT). The structural and textural properties of the P-CNT samples were well-investigated via a series of characterization methods. Compared with the bulk g-C3N4, the tubular structure of the doped samples was provided with a larger specific surface area (SSA) and a relatively rough interior. Besides the above, surface defects were formed due to the doping, which could act as more active sites for the hydrogen production reaction. In addition, the introduction of the P element could effectively adjust the band-gap, strengthen the harvest of visible-light, and boost the effective separation of photogenerated charges. More interestingly, these findings can open up a novel prospect for the enhancement of the photocatalytic performance of the modified g-C3N4.Keywords:P-doped;g-C3N4;porous wall;surface defect;photocatalytic hydrogen evolution
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ENVIRONMENTAL POLLUTION
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2023
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IF 8.9
Xuejuan Hou,Hui Nan,Xin Chen,Fei Ge,Yun Liu,Feng Li,Dayi Zhang,Jiang Tian
Glyphosate (Glp) was encapsulated onto the dopamine-modified attapulgite to develop an attapulgite-based nano-enabled Glp (DGlp) in this study with comparable weed control effects to pure Glp and commercial Glp solutions. Within 24 hours, the active Glp molecule was slowly released from DGlp at a maximum remaining rate of over 90%, and then degraded similarly to Glp solution in soil. The addition of DGlp improved soil available phosphorus (P) contents, phosphatase activity, and enzyme extractable P fraction. However, compared to Glp solution, DGlp addition had no effect on the transformation of soil inorganic P fractions. The 16S rRNA sequencing and co-occurrence network results revealed that DGlp had no significant effect on the soil bacterial diversity but diminished the complexity of soil bacterial network. According to the Mantel test, DGlp addition stimulated soil phosphatase activity and proliferation of dominant bacterial taxa (Proteobacteria and Firmicutes) capable of degrading Glp. Proteobacteria and Firmicutes that had been extensively recruited and enriched for their phosphatase activities may have mobilized reactive enzyme-P, significantly enhancing the transformation of reactive organic P and P-pool in soil. These results contributed to our understanding of the ecotoxicity and environmental impacts of nano-enabled Glp prior to its successful and sustainable application in agriculture.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Ya You,Shuang-Ning Li,Jiao Zou,Ya-Nan Xin,Sui Peng,Bo Liu,Xin-Yu Jiang,Jin-Gang Yu
In recent years, nanocomposites prepared from rare earth metal vanadate and carbon nanomaterials have attracted great attention, and they have shown great promise for electrochemical sensing applications. Herein, a facile ultrasonic-assisted assembly method was adopted to prepare neodymium vanadate/hydroxylated multi-walled carbon nanotubes (NdV/MWCNTs-OH) composite. The morphology, elemental states, crystal structure and functional groups of the composites were investigated through a series of characterizations. Then, a novel electrochemical sensor , NdV/MWCNTs-OH composite modified glassy carbon electrode (GCE), was designed for the detection of p-nitrophenol (PNP). The synergistic effect generated by the combination of NdV and WMCNTs-OH accelerated the charge transfer kinetics and exposed more active sites, which facilitated more effective detection. Under optimized experimental conditions, the as-prepared sensor exhibited a wider linear range (1–200 μM) to PNP, and a lower limit of detection (LOD) of 0.41 μM could be obtained (signal-to-noise ratio of 3; S/N = 3). Furthermore, the sensor was successfully used for the determination of PNP in real samples (industrial wastewater and river samples), and satisfactory recoveries (96.67%−101.88%) with RSDs less than 5% were observed. Herein, the prepared electrochemical sensor has potential application prospect in the analysis and detection of PNP.
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WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 4
·879-901
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IF 3.4
Luo Lingcong,Zhang Qianqian,Lan Yuling,Deng Jianping,Lin Yang,Du Guanben,Zhao Weigang
High-performance electrodes of activated carbons (PNOACs) with P, N, and O heteroatoms were prepared through a simple one-step phosphoric acid activation method without the need for any dopants or post-treatment. In the preparation procedure, cork biomass material from Quercus variabilis was used as the precursor, and phosphoric acid was used as both the phosphoric resource and the activation agent. The pore structure, morphology, and physicochemical properties of the as-prepared carbons were investigated. In addition, the electrochemical performances of the PNOACs were evaluated using three-electrode and two-electrode systems (symmetric supercapacitor, AS). The results indicated that cork is promising as a low-cost and environmental-friendly precursor for producing high-performance supercapacitors electrode. Furthermore, galvanostatic charge–discharge analysis revealed a specific capacitance of 206 F g −1 at a current density of 0.5 A g −1 , which can be attributed to the excellent hierarchical pore structure (micro-, meso-, and macropores) and suitable pore size distribution of the PNOACs. The specific surface area and total pore volume as high as 515.80 m 2 g −1 and 0.29 cm 3 g −1 were obtained, respectively. The presence of heteroatoms, namely N (0.81–1.07%), P (0.52–2.06%), and O (15.87–19.18%) content, on the carbon surface resulted in a considerable enhancement in the capacitive performance. Furthermore, a PNOAC sample, prepared at 600 °C with a mass ratio of 1:1, exhibited high long-term cycling stability (84.5%) and an energy density of 15.03 W h kg −1 . Therefore, cork is highly promising as an electrode material for supercapacitors to attain exceptional electrochemical performance, as well as provide a new possibility for the utilization and valorization of high-value cork waste.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Min Zhang,Yunyuan Dong,Mengling Peng,Xiaobin Chen,Qifu Zheng,Jianming Liao,Wei Chen
Construction of carbon-based heterostructural photocatalyst materials with high electron transfer rates is a practical and effective strategy for the mineralization of organic pollutants and removal of toxic metal ions under visible-light irradiation. This study developed a facile hydrothermal route to prepare a series of heterojunction photocatalysts, wherein Zn x Cd 1- x In 2 S 4 nanosheets were immobilized on nitrogen and phosphorus co-doped hollow carbon spheres (N, P-C) to form N, P-C@Zn x Cd 1- x In 2 S 4 nanocomposites. Comprehensive characterization of the nanocomposites revealed that the tuning of the Zn/Cd molar ratio could effectively modulate the Zn x Cd 1− x In 2 S 4 energy band structure. Moreover, Zn 0.5 Cd 0.5 In 2 S 4 had the most negative conduction band position and loads on non-metal-doped carbon, with superior carrier transport properties and separation efficiency. N, P-C@Zn 0.5 Cd 0.5 In 2 S 4 (N, P-C@ZCIS2) exhibited the best photocatalytic activity for tetracycline hydrochloride degradation and Cr(VI) reduction, with rate constants of 0.04822 mg −1 min −1 and 0.14303 min −1 , respectively. Notably, the photocatalysts exhibited good activity and stability even after cycle experiment. This study provides new insights into the design of carbon-based heterojunction photocatalysts for the removal of harmful chemicals.
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Nanomaterials
·
2023
·Vol. 13
·期 9
·1571
·
IF 5.3
Xamxikamar Mamat,Haji Akber Aisa,Longyi Chen
Acetaminophen (N-acetyl-p-aminophenol, APAP) is regularly used for antipyretic and analgesic purposes. Overdose or long-term exposure to APAP could lead to liver damage and hepatotoxicity. In this study, the approach of enhanced electrochemical detection of APAP by nanostructured biomass carbon/silver was developed. Porous biomass carbon derived from Elaeagnus Angustifolia gum was prepared by pyrolysis with co-doping of electron-rich elements of nitrogen, sulfur, and phosphorus. The electrodeposition of silver onto a glassy carbon electrode modified with porous carbon could enhance the sensing signal towards APAP. Two linear ranges from 61 nM to 500 μM were achieved with a limit of detection of 33 nM. The developed GCE sensor has good anti-interference, stability, reproducibility, and human urine sample analysis performance. The silver-enhanced biomass carbon GCE sensor extends the application of biomass carbon, and its facile preparation approach could be used in constructing disposable sensing chips in the future.Keywords:acetaminophen;nanostructured porous carbon;electrodeposition;silver enhancement;modified GCE;electrochemical sensing
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THIN SOLID FILMS
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2023
·
IF 2.1
Tingting Wang,Longhua Li,Zhaolu Yin,Shaoyong Chen,Junli Wang
Semiconductor-sensitized TiO 2 thin films have been widely applied in optoelectronic devices. Here we prepared narrow bandgap (∼1.77 eV) selenium (Se)-sensitized TiO 2 thin films by spin-coating of Se inks onto a TiO 2 mesoporous layer, which forms a p-Se/n-TiO 2 heterojunction interface and holds promise for self-driven visible-light detection and sensing. Under irradiation by simulated sunlight and monochromatic visible-light, the resultant films exhibit large on-off switch ratio, fast response speed, and high spectral responsivity and detectivity at zero bias. Meantime, the p-Se/n-TiO 2 films show notable photoresponse stability and can maintain 92% and 64% of photocurrent of the pristine device after 2-month air storage and 72 h water soaking, respectively. Such good oxygen and moisture resistance of Se/TiO 2 thin films would be promising as applied in environmentally-stable heterojunction optoelectronic devices.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Tianxing Gong,Tingyu Li,Lisha Meng,Yadong Chen,Tao Wu,Jingqiu Zhou,Guoxiu Lu,Zhiguo Wang
Native bone is piezoelectric in nature and generates abundant surface charges under mechanical compression, which regulate osteoblast proliferation, differentiation, adhesion, and so on. Poly (vinylidene fluoride) (PVDF) is becoming one of the most popular piezoelectric polymers because of its easy processability and good biocompatibility. Unfortunately, because only the β and γ crystal phases of PVDF have piezoelectricity, post-treatments, for example, polarizing at high temperature, are required to enhance the piezoelectricity of PVDF scaffolds after fabrication. In this study, we reported a phase-separation-hydration method to fabricate a calcium phosphate silicate (CPS)-doped PVDF scaffold. Our method fabricated a better piezoelectric scaffold than native bone without further processing (∼ 3 pC/N vs. 0.7 pC/N). In addition, the scaffold was mechanically compatible (∼ 7 MPa) with the cancellous bone with sufficient porosity (∼ 45%) to facilitate osteoblast infiltration and bone ingrowth. The in vitro biocompatibility analyses proved that the prepared CPS-PVDF scaffold was biocompatible with osteoblast cells and encouraged osteoblast redifferentiation. In conclusion, our results suggest that this CPS-PVDF scaffold is a promising candidate for bone tissue engineering applications.
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WASTE MANAGEMENT
·
2021
·
IF 7.145
Zishang Tian,Xiaojie Shao,Jiaojiao Zhang,Lijuan Su,Yingxiong Wang,Tiansheng Deng,Yuqi Wang,Xianglin Hou
Poly-p-phenylene terephthamide (PPTA) is widely applied in bulletproof products and composite materials because of its high strength, high modulus, high temperature resistance and creep resistance. The PPTA molecule with highly symmetrical and regular structure is linear structure formed by the alternating connection of benzene ring and amide bond, and the amide bonds between the molecular chains form strong hydrogen bonds. Therefore, the dissolution and depolymerization of PPTA is very challenging. In this work, an efficient catalytic system was developed for the controllable degradation of waste PPTA, and the high-value added monomers terephthalic acid (TPA) and p-phenylenediamine (PPD) were recovered. The results show that the amide bonds of PPTA can be selectively cleaved by the strong Brönsted base catalysts in alcohols, especially in the NaOH/ n -butanol system. Under the optimal degradation conditions (5 wt% NaOH in n -butanol, 180 °C, 6 h), the percentage degradation of PPTA is 100%, and the yields of TPA and PPD are 92.0% and 91.5%, respectively. In addition, it is found that the wettability of n -alcohols on PPTA monofilament and the addition of a small amount of water have important influences on the degradation of PPTA. The work elucidates the degradation mechanism of PPTA, and reveals the important factors affecting the depolymerization of PPTA.
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RSC Advances
·
2021
·Vol. 11
·期 60
·38003-38015
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IF 3.361
Mengdi Tang,Yonggang Zhang
Degradation of nonbiodegradable organic compounds into harmless substances is one of the main challenges in environmental protection. Electrically-activated persulfate process has served as an efficient advanced oxidation process (AOP) to degrade organic compounds. In this study, we synthesized three nitrogen-doped carbon materials, namely, nitrogen-doped activated carbon plus graphene (NC), and nitrogen-doped activated carbon (NAC), nitrogen-doped graphene (NGE), and three nitrogen-doped carbon material-graphite felt (GF) cathodes. The three nitrogen-doped carbon materials (NC, NGE, NAC) were characterized using X-ray diffraction, Raman spectroscopy, X-ray electron spectroscopy, and nitrogen desorption–adsorption. The electron spin resonance technique was used to identify the presence of hydroxyl radicals (˙OH), sulfate radicals (SO4˙−) and singlet oxygen (1O2) species. The results showed that NC was more conducive for the production of free radicals. In addition, we applied NC-GF to an electro-activated persulfate system with the degradation of p-nitrophenol and investigated its performance for contaminant degradation under different conditions. In general, the nitrogen-doped carbon electrode electro-activated persulfate process is a promising way to treat organic pollutants in wastewater.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Tuo Zhao,Chuan Long,Zhiqian Wang,Hong Zhu
As a key component of anion exchange membrane fuel cells (AEMFCs), anion exchange membranes (AEMs) have been investigated in the last decades. Herein, a series of multication cross-linkers were introduced into side-chain-type poly(p-terphenyl isatin) to develop high-performance and long-term stable AEMs. Additionally, the effects of the hydrophilic cross-linker length on the membrane performance were systematically investigated. The resulting cross-linked membranes possess a low swelling ratio (<18% at 80 °C) and high tensile strength (51.1–58.3 MPa). Notably, the cross-linker length influences the AEM internal morphology. With hexyl as the spacer between backbones and cation groups in the cross-linker, 0.9q-PTI-6C exhibits the highest hydroxide ion conductivity of 118.5 mS/cm at 80 °C, which is ascribed to well-developed ion channels. Furthermore, alkyl spacer chains and cross-linked networks contribute to the excellent alkali stability of membranes. After immersion in 2 M NaOH for 1200 h at 80 °C, 0.9q-PTI-8C only shows 11 and 12.7% losses in ion conductivity and ion exchange capacity (IEC), respectively. The fuel cell fabricated using 0.9q-PTI-6C can achieve the maximum power density of 310 mW/cm2 at 80 °C.
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