APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Long Chen,Ze Li,Qinqin Xiao,Miao Li,Yan Xu,Xiaoqing Qiu
In this work, graphite carbon nitride nanosheets (CNNS) with an average thickness of about 1 nm were prepared by stepwise stripping, after surface modification with Cu(II) cluster, which can be applied to construct photoelectrochemical sensors for p-nitrotoluene monitoring. In the detection process, Cu(II) can effectually expedite the separation of photogenerated electron-hole pairs in CNNS, and significantly enhance photocurrent signals for the p-nitrotoluene sensing via the redox action of Cu(II)/Cu(I). More importantly, the change of photocurrent signal of the photoelectrochemical sensor (CNNS-Cu2% as the representative sample) presents a perfect linear relationship with the logarithm of p-nitrotoluene concentration in the range of 0.1–100 μmol L −1 . Therefore, the constructed CNNS-Cu2% photoelectrochemical sensor can be diffusely employed for the trace detection of p-nitrotoluene in the real-time monitoring of water environmental contaminants. This work supplies a novel insight to the better design and construction of efficient and durable photoelectrochemical sensors.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Fang Li,Yachao Xi,Jianming Jiang,Hao Peng,Bing Li,Jianbo He,Jiangnan Shu,Hua Cui
Graphitic carbon nitride (g-CN) is an attractive electrochemiluminescence (ECL) luminophore. However, g-CN with wavelength-tunable ECL emission is still limited, which limits its application in multicolor ECL sensing and imaging analysis. In this study, porous g-CN (PCN) with nitrogen defects was synthesized through the condensation of melamine by using o-fluorobenzoic acid (o-FBA) as an effective regulation reagent. A series of PCNs, including PCN-5%, PCN-10%, and PCN-30%, were obtained by changing the mass ratio of o-FBA and melamine. The porous structure and tunable chemical composition change of the PCNs were carefully characterized. The nitrogen defects and porous structure of the synthesized PCNs can enlarge the specific surface area, facilitate electron transfer, and generate various surface states with gradually changed energy bands, leading to wavelength-tunable multicolor ECL emissions. Accordingly, g-CN, PCN-5%, PCN-10%, and PCN-30% can generate navy blue, turquoise blue, turquoise green, and olive green ECL emissions, respectively, with the peak ECL wavelength varied from 465 to 550 nm. Then, a multicolor ECL sensing array was proposed for the discrimination of polyphenols based on the prepared g-CN and PCNs by using a smartphone as a portable detector for the first time. Five polyphenol substances including vitamin P, resveratrol, phloretin, phlorizin, and caffeic acid were discriminated by using principal component analysis and hierarchical cluster analysis. The present work provides a simple strategy to adjust the ECL wavelength of g-CN and presents a simple way to fabricate multicolor ECL sensing array, which has great application potential for multiplexed analysis and multicolor ECL imaging sensing.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xinyue Luo,Hongqin Ma,Junyu Gao,Luqi Yu,Xingpeng Gu,Jiahao Liu
The development of an effective and inexpensive electrocatalyst for the oxygen evolution reaction (OER) is the key to achieve high hydrogen production since water splitting has sluggish OER kinetics. Herein, a composite of nickel-rich nickel nitride (NR-Ni3N) with graphitic carbon nitrides (GCNs) was prepared for the electrocatalytic OER, showing a low overpotential of ∼290 mV, a small Tafel slope of ∼70 mV dec–1 at 10 mA cm–2 current density, and low loss of activity after 36 h of test in an alkaline electrolyte, outperforming the pure Ni3N and even the noble catalyst RuO2. The characterization results revealed that the defective GCNs can promote the generation of a Ni-rich region in Ni3N in the nitridation process, and the high conductivity of the formed robust Ni–Ni3N heterojunction and its strong synergistic effect with GCNs explain the excellent OER electrocatalytic performances of NR-Ni3N/GCNs. This work provides a novel feasible strategy for the development of highly active OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·76
·
IF 3.426
Tingting Wang,Bo Song,Li Wang
In this study, graphitic carbon nitride (g-C3N4) as a novel filler was used for fabricating epoxy nanocomposites. The static mechanical, dynamic thermal-mechanical properties and thermostability of as-prepared g-C3N4/epoxy nanocomposites were significantly ameliorated compared with that of the pure epoxy matrix. The tensile modulus and flexural modulus of g-C3N4/epoxy nanocomposites increased by 31.81% and 28.28%, respectively. Meanwhile, the tensile and flexural strength was also improved by 16.02% and 12.67%, respectively. The g-C3N4/epoxy nanocomposites exhibited an increased storage modulus and glass transition temperature. The markedly improved mechanical and viscoelasticity properties were attributed to the stronger interfacial interaction caused by enlarged contact area and increased chemical bonding, and enhanced mechanical interlocking on the interface. The loss factor of epoxy nanocomposites also raised by 40% due to the comprehensive effect of frication caused by the relative slip between nanosheets, micro-constrained layer damping structure and the reversible cycle of breakage and re-established of the hydrogen bond. Meanwhile, the 10% weightlessness temperature (Tinitial), semi weightlessness temperature (Thalf) of g-C3N4/epoxy nanocomposites have increased by about 15 °C and 14 °C, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Qiuyan Bi,Chao Zhang,Jiandong Liu,Xingliang Liu,Shiai Xu
A nanofiltration (NF) membrane with positive charges capable of separating Mg 2+ and Li + from high Mg/Li ratio brine was prepared by interfacial polymerization of 1, 4-bis (3-aminopropyl) piperazine (BAPP)/trimesoyl chloride monomers, and then nano graphitic carbon nitride (g-C 3 N 4 ) functionalized with zwitterion (BHC-CN) was introduced into the active layer of the fabricated membrane. Salt permeation and selectivity were improved with the increase of BHC-CN content to 0.02% in BAPP solution. The morphology and surface chemical composition of BHC-CN were detected. The surface Zeta potential test indicates that the membrane fabricated with BHC-CN is positively charged at pH < 7.33. The presence of small aggregates on the surface of the membrane may increase the effective filtering area of the membrane and thus improve the permeability. It also exhibits long-time stability and excellent separation of Mg 2+ and Li + , and the Mg/Li ratio is decreased from 73 in the feed to 1.85 in the permeation. Moreover, the resulted membrane shows good fouling resistance. In conclusion, the membrane has potential advantages in water softening and recovering Li + from brine with high Mg/Li ratio.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 8
·1606219
·
IF 12.124
Chao Lu,Dongxing Wang,Jingjing Zhao,Song Han,Wei Chen
Flexible supercapacitors with high power density, flexibility, and durability have shown enormous potential for smart electronics. Here, a continuous graphitic carbon nitride polyhedron assembly for flexible supercapacitor that is prepared by pyrolysis of carbon nanotubes wired zeolitic imidazolate framework-8 (ZIF-8) composites under nitrogen is reported. It exhibits a high specific capacitance of 426 F g −1 at current density of 1 A g −1 in 1 m H 2 SO 4 and excellent stability over 10 000 cycles. The remarkable performance results from the continuous hierarchical structure with average pore size of 2.5 nm, high nitrogen-doping level (17.82%), and large specific surface area (920 m 2 g −1 ). Furthermore, a flexible supercapacitor is developed by constructing the assembly with interpenetrating polymer network electrolyte. Stemming from the synergistic effect of high-performance electrode and highly ion-conductive electrolyte, superior energy density of 59.40 Wh kg −1 at 1 A g −1 is achieved. The device maintains a stable energy supply under cyclic deformations, showing wide application in flexible and even wearable conditions. The work paves a new way for designing pliable electrode with excellent electronic and mechanic property for long-lived flexible energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Junlun Zhu,Wei Nie,Qin Wang,Jingwen Li,Huan Li,Wei Wen,Ting Bao,Huayu Xiong,Xiuhua Zhang,Shengfu Wang
This study reported a facile approach for the preparation of copper oxide-graphitic carbon nitride nanocomposites by an in situ growth method in aqueous solution. The powder X-ray diffraction, transmission electron microscopy , X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and atomic force microscopy characterizations of the copper oxide-graphitic carbon nitride nanocomposites suggest that we have successfully synthesized a novel nanozyme . The nano-sized of copper oxide nanoparticles embedded in graphitic carbon nitride nanoparticles were evaluated focusing on the principle of horseradish peroxidase-like activity catalyzing the oxidation of 3, 3′, 5, 5′-tetramethylbenzidine in the presence of hydrogen peroxide. Furthermore, we constructed dual sensor platforms based on copper oxide-graphitic carbon nitride nanocomposites. By constructing an electrochemical platform and a colorimetric sensor to detect hydrogen peroxide, it is shown that copper oxide-graphitic carbon nitride nanocomposites had an excellent peroxidase mimicking catalytic performance. We envision that our nanozyme have great potential in a variety of applications in catalytic field, electrochemical sensing, optical imaging , and environmental assay.
研究领域:
材料科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Gu Ying,Hu Yuanling,Zhang Fuyuan,Yi Lunzhao,Shang Ying,Ren Dabing,Ge Zhenhua
A glucose (Glu) sensor was designed by introducing synthetic cyclic peptides (CPs) as recognition receptors and Au nanoparticles assisted graphitic carbon nitride (AuNPs/g-C 3 N 4 ) for electrochemiluminescence (ECL) enhancement. The synthetic CP receptor (cyclo-[−CNDNHCRDNDC−]) with natural active center of Glu binding protein can mimic the interactions between Glu and Glu binding protein to specifically capture Glu. The AuNPs were reduced on g-C 3 N 4 and formed a new nanohybrid that can be applied as an ECL emitter. The AuNPs/g-C 3 N 4 effectively ameliorated the ECL response of bare g-C 3 N 4 . The ECL enhancement mechanism was theoretically speculated through computer simulation. Glu quantification was conducted by recording ECL shifts induced by the binding of Glu to CPs. The linear detection range of the fabricated CPs-based ECL sensor was 1 to 100 mmol L −1 , and the detection limit (LOD) was 0.57 nmol L −1 (S / N = 3). The CP-based ECL sensor also showed good specificity, repeatability, stability, and favorable recoveries in sample analysis. This work offer a promising analytical method for Glu assay in clinical diagnostics and bioprocess monitoring. Graphical abstract
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 413
·期 1
·215-223
·
IF 3.637
Li Na,Zhao Tengwen,Du Li,Zhang Ziyang,Nian Qixun,Wang Manman
A graphitic carbon nitride (g-C 3 N 4 /Fe 3 O 4 )–based magnetic solid-phase extraction (MSPE) approach was established for fast and simple analysis of estrogens in milk powders. The composites were characterized by X-ray diffractometer, scanning electron microscope, and Brunauer-Emmett-Teller surface area and pore size distribution analyzer. Compared with the bulk g-C 3 N 4 , g-C 3 N 4 /Fe 3 O 4 gave a narrower distribution of mesopores and provided an enhanced surface area from 77.1 to 113.7 m 2 /g. Polar analytes of estrogens were selected as model compounds and the extraction of four estrogens was achieved in n-hexane using 15 mg of adsorbent within only 2 min. Possible extraction mechanism of g-C 3 N 4 /Fe 3 O 4 for these estrogens was explored in terms of the polarity of the analytes and the adsorption performance of the adsorbent. The hydrophobicity and the hydrogen-bond interaction between the estrogens and g-C 3 N 4 were responsible for the efficient adsorption. Combined with HPLC, MSPE with the prepared adsorbent gave the enhancement factors of 20 to 24 and the linear ranges of 2–200 μg/kg for 17 β -estradiol and 17 α -ethinylestradiol, 1.5–150 μg/kg for estrone, and 3–300 μg/kg for hexestrol. The detection limits and quantification limits for the estrogens in milk powders were 0.5–0.9 μg/kg and 1.5–3.0 μg/kg, respectively. The recoveries varied from 75.1 to 97.2%, with the intra-day and inter-day precisions ≤ 14.2%. Furthermore, the enrichment of the analytes and the clean-up of fat and protein interferences were achieved simultaneously with one-step g-C 3 N 4 -based MSPE. The present method was convenient, fast, and sensitive, and therefore could be successfully applied for the determination of estrogens in milk powders.
Graphical abstract
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Huayu Qian,Shouwen Chen,Yongsheng Fu,Xin Wang
A composite catalyst consisting of Pt–Pd bimetallic nanoparticles (NPs) and graphitic carbon nitride (g-C 3 N 4 ) modified carbon black (CB) is designed and fabricated by a facile two-step approach. The resulting catalyst exhibits unprecedented high catalytic activity and excellent long-term stability for electrooxidation of alcohols (methanol, ethanol, ethylene glycol and glycerol) in alkaline media . The superior electrochemical performance of the composite catalyst is attributed to the specific characteristics of the unique nanostructure and the synergistic effects of individual components, including the complementary roles of Pt (dehydrogenation site) and Pd (removal of CO-like species), the template effect of the planar amino group of g-C 3 N 4 for the dispersed decoration of Pt–Pd NPs, the high specific surface area of CB for the rapid diffusion of electrolyte and removal of the carbonaceous intermediates, as well as the structural stability of the support based on covalent interaction between g-C 3 N 4 and CB for maintaining the durability of the catalytic system .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2022
·Vol. 28
·期 3
·615-630
·
IF 2.297
Yuhui Zhang,Yu Zhao,Zihao Wang,Xuegang Jiang,Xiucai Liu,Weihong Guo
Seeking a facile strategy to synthesize efficient and inexpensive flame retardant which endows biobased polyamide 56 (PA56) with desirable flame retardancy is an urgent need. Here, ammonium polyphosphate (APP) was modified with graphitic carbon nitride (g-C 3 N 4 ) to synthesize a nitrogen-phosphorus flame retardant (CN@APP) and then applied in biobased PA56. The X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectra demonstrated that APP was successfully microencapsulated with g-C 3 N 4 . The micromorphology structure was further characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). PA56/CN@APP attained a UL 94 V-0 rating and limiting oxygen index (LOI) value of 31.7%. A sharp reduction of 35.3% in peak heat release rate (pHRR) and 24.0% in total heat release (THR) and an 874% increase in char yield were noticed for PA56/CN@APP2 compared with pure PA56. Additionally, the peak smoke production rate (pSPR) and total smoke production (TSP) of PA56/CN@APP2 were 33.0% and 21.8% lower than those of pure PA56. Scanning electron microscopy (SEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were employed to analyze the condensed phase residues from the cone calorimeter test (CCT). The results indicated that CN@APP was beneficial for forming a more stable and compact carbon layer during combustion, thereby insulating the heat transfer and improving the flame retardancy and smoke suppression of PA56.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 6
·e202200118
·
IF 3.82
Zhe Shi,Changsheng Tang,Yidong Xu,Yinghui Hu,Jian Zhang,Zhaoyang Zhu,Jian Zheng,Ruiqing Fan,Debin Xia,Yulin Yang
Graphical In this study, n-CuO-X/g-C 3 N 4 composites have been synthesized and were applied for catalyzing AP thermal decomposition. The generated n-CuO/g-C 3 N 4 composites were the excellent catalyst for AP-based composite solid propellants to improve their decomposition efficiency and energy output. The thermal decomposition mechanism of AP was investigated and n-CuO-X/g-C 3 N 4 composites could effectively change the thermal decomposition path of AP and significantly inhibited the conversion of N 2 O to NO during decomposition, thus increasing the apparent heat release of AP decomposition. Enhancing the exothermic decomposition of ammonium perchlorate (AP) is of great significance to obtain solid propellants with excellent combustion performance. Herein, we prepared a series of composites for catalyzing the exothermic decomposition of AP by a facile method with different masses of nano copper oxide (n-CuO) dispersed in graphene-nitride carbon (g-C 3 N 4 ) nanosheets. Among them, n-CuO-8/g-C 3 N 4 showed the best catalytic activity, which reduced the high-temperature decomposition (HTD) value by 95.0 °C, and increased the total heat release by 505 J ⋅ g −1 . The n-CuO-12/g-C 3 N 4 also reduced the activation energy ( E a ) of the HTD stage by 47.34 kJ ⋅ mol −1 . The catalytic mechanism study suggested that the n-CuO-X/g-C 3 N 4 composites promoted the transition of electrons (e − ) and holes (h + ) from ClO 4 − to NH 4 + and inhibited the recombination of e − and h + , which further enhanced the exothermic decomposition of AP. During decomposition, the transformation of N 2 O to NO was significantly inhibited by the n-CuO-X/g-C 3 N 4 composites, thus increasing the integral heat release as evidenced by Real-time thermogravimetry/Fourier transform infrared spectroscopy. This study illustrated that n-CuO-X/g-C 3 N 4 composites are catalysts for the efficient decomposition of AP, which further enhance the energy performance of solid propellants.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）