INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
·
IF 2.93
Junxian Wang,Jie Huang,Haolong Xie,Ailan Qu
A photocatalyst composed of graphite-like carbon nitride (g-C 3 N 4 ) and TiO 2 was fabricated by a simple method to calcine the mixture of melamine and TiO 2 precursor. The photocatalyst has enhanced photoactivity for hydrogen evolution from water. Characterization by XRD , FTIR, SEM and elemental analysis showed that the crystal structure and morphologies of composites were affected by the amount of melamine in the composite. The UV–Vis characterization displayed that the optical absorption range of g-C 3 N 4 /TiO 2 hybrid was broadened with a synergistic effect . The photoactivity for H 2 evolution was shown that the best result obtained from the composite with 67 wt% melamine has about 5 times improvement compared with bare TiO 2 or pure g-C 3 N 4 . The enhanced photoactivity might be related with the favorable structure resulted from heat-treatment temperature, and the content of g-C 3 N 4 participating in wide optical absorption, separation and transportation of electronic-holes, as well as morphology of composite.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Liu Pi,Rui Jiang,Wangchi Zhou,Hua Zhu,Wei Xiao,Dihua Wang,Xuhui Mao
Converting the waste biomasses with high-carbon content into value-added materials is an environmental-friendly way for their utilization. In this study, a leaf-derived biochar is modified with graphitic C 3 N 4 to fulfill an affordable composite material capable of removing organic pollutants via adsorptive and photocatalytic processes simultaneously. The preparation process includes a carbonization process of chestnut leaf biomass and a followed condensation reaction of melamine at 520 °C. The characterization shows that biochar and C 3 N 4 existed in the composites in their pristine status, and the effective connection of C 3 N 4 and biochar was established. The adsorptive performance of the composites is governed by the biochar content in the composite, thus showing favorable performance for the removal of cationic dye methylene blue (MB). The condensation reaction of the melamine precursor has a coalescing effect on the dispersed biochar, resulting in the growth of particle size of composite. The composites prepared at different biochar/melamine ratios all show a photocatalytic activity on decolorization of MB. In terms of the specific photocatalytic activity of C 3 N 4 in the composite, biochar/melamine ratio of 0.5:1 is the best. Unlike the conventional adsorptive carbon materials which have saturated adsorption capacity, the composite in this study retain a sustaining decontamination capability due to the photocatalytic degradation of adsorbed organic pollutants under irradiation.
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BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Wei Tao Huang,Jian Rong Zhang,Wan Yi Xie,Yan Shi,Hong Qun Luo,Nian Bing Li
Herein, by combining the merits of nanotechnology and fuzzy logic theory, we develop a simple, label-free, and general strategy based on an organic dye-graphene hybrid system for fluorescence intelligent sensing of G-quadruplexes (G4) formation, hydroxyl radical (HO∙), and Fe 2+ in vitro. By exploiting acridine orange (AO) dyes-graphene as a nanofilter and nanoswitch and the ability of graphene to interact with DNA with different structures, our approach can efficiently distinguish, quantitatively detect target analytes . In vitro assays with G4DNA demonstrated increases in fluorescence intensity of the AO–rGO system with a linear range of 16–338 nM and a detection limit as low as 2.0 nM. The requenched fluorescence of the G4TBA–AO–rGO system has a non-linear response to Fenton reagent. But this requenching reduces the fluorescence intensity in a manner proportional to the logarithm to the base 10 of the concentration of Fenton reagent in the range of 0.1–100 μM and 100–2000 μM, respectively. Furthermore, we develop a novel and intelligent sensing method based on fuzzy logic which mimics human reasoning, solves complex and non-linear problems, and transforms the numerical output into the language description output for potential application in biochemical systems, environmental monitoring systems, and molecular-level fuzzy logic computing system.
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Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 7
·2071-2078
·
IF 0
Lin Zhang,Dengwei Jing,Xilin She,Hongwei Liu,Dongjiang Yang,Yun Lu,Jian Li,Zhanfeng Zheng,Liejin Guo
The formation of heterojunctions is an efficient strategy to extend the light response range of TiO2-based catalysts to the visible light region. In addition to the bandgap edge match between the narrow bandgap semiconductors and the TiO2 substrate, a stable phase interface between the sensitiser and TiO2 is crucial for the construction of heterojunctions, since it acts as a tunnel for the efficient transfer of photogenerated charges. Herein, the coincidence site density (1/Σ) of graphite-like carbon nitride (g-C3N4) nanoflakes and two types of TiO2 nanofibres [anatase and TiO2(B)] was calculated by near coincidence site lattice (NCSL) theory. It was found that the coincidence site density of g-C3N4 and TiO2(B) nanofibre with an exposed (001) plane is 3 times of that of the g-C3N4 and anatase nanofibre with exposed (100) plane. This indicated that the g-C3N4 nanoflakes are more favoured to form stable heterojunctions with TiO2(B) nanofibres. As expected, a stable phase interface was formed between the plane of (22–40) of g-C3N4 and the plane (110) of TiO2(B) which had same d-spacing of 0.35 nm and the same orientation. Under visible light irradiation, the photogenerated electrons could efficiently migrate to the TiO2(B) nanofibres from the g-C3N4 through the heterojunctions. So the g-C3N4/TiO2(B) system exhibited better photodegradation ability for sulforhodamine B (SRB) dye than the g-C3N4/anatase system, although the photoactivity of the anatase nanofibres was much better than that of the TiO2(B) nanofibres.
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JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Lei Zhang,Zhengjun Cheng,Xiao Guo,Xiaohui Jiang,Rong Liu
We report an investigation of the title process. The corresponding process variables such as the concentration of surfactant, temperature, initial concentration of dye have been optimized by the response surface methodology (RSM). A 2 3 full factorial design was employed to analyze the individual and interaction effects of the process variables. The experimental data have been well-fitted to second order polynomial equations and the models were also examined using the analysis of variance and t test statistics. The obtained optimal conditions are as following: C s = 30.92 μM, T = 20 °C and C OG = 320 mg/L for the orange G , and C s = 34.10 μM, T = 50 °C and C OA = 500 mg/L for the acid orange 7. The measured experimental maximum adsorption capacities for the orange G and acid orange 7 systems under above optimization conditions were 1452.07 and 2352.99 mg/g, which were in good agreement with their corresponding predicted values (1427.13 and 2357.31 mg/g), with small relative errors of 1.72% and − 0.18%, respectively. Moreover, many aspects of the adsorption kinetics and isotherms for the two dyes are presented. The results indicated that the two adsorption equilibriums were achieved within 210 and 240 min for the acid orange 7 and orange G, the pseudo-second-order model was followed, and Langmuir isotherm model could be well described their adsorption data. In addition, the adsorption mechanism of two dyes onto chitosan/surfactant was discussed further by FTIR and X-ray diffraction (XRD) methods.
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RSC Advances
·
2015
·Vol. 5
·期 31
·24507-24512
·
IF 3.84
Qi Li,Yi He,Rufang Peng
Development of metal-free and environmentally friendly catalysts is of great significance for thermal decomposition of ammonium perchlorate (AP). In the present study, graphitic carbon nitride (g-C3N4) has been demonstrated to possess intrinsic catalytic activity for thermal decomposition of AP. Adding 10 wt% g-C3N4 to AP decreases the decomposition temperature by 70 °C and the activation energy (Ea) by 119.8 kJ mol−1. Moreover, the apparent decomposition heat of AP in the presence of 10 wt% g-C3N4 reaches up to 1362.6 J g−1, which is much higher than that of the pure AP (574.2 J g−1). Furthermore, a possible catalytic mechanism for the thermal decomposition of AP with g-C3N4 has been proposed. The unique surface structure of g-C3N4 consisting of triazine units connected by planar amino groups can be favourable for the adsorption and diffusion of perchloric acid via Lewis acid–base interactions, which decreases the reaction activation energy of AP and facilitates the formation of superoxide radical anions (˙O2−) and holes (h+), leading to the oxidation reaction of ammonia more completely in the catalytic decomposition of AP.
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PLoS One
·
2024
·Vol. 19
·期 1
·e0297149
·
IF 2.9
Zhixiang Lv,Zhou Wang,Shaobo Wu,Xiang Yu
With the emergence of penicillin resistance, the development of novel antibiotics has become an urgent necessity. Semi-synthetic penicillin has emerged as a promising alternative to traditional penicillin. The demand for the crucial intermediate, 6-aminopicillanic acid (6-APA), is on the rise. Enzyme catalysis is the primary method employed for its production. However, due to certain limitations, the strategy of enzyme immobilization has also gained prominence. The magnetic Ni 0.4 Cu 0.5 Zn 0.1 Fe 2 O 4 nanoparticles were successfully prepared by a rapid-combustion method. Sodium silicate was used to modify the surface of the Ni 0.4 Cu 0.5 Zn 0.1 Fe 2 O 4 nanoparticles to obtain silica-coated nanoparticles (Ni 0.4 Cu 0.5 Zn 0.1 Fe 2 O 4 -SiO 2 ). Subsequently, in order to better crosslink PGA, the nanoparticles were modified again with glutaraldehyde to obtain glutaraldehyde crosslinked Ni 0.4 Cu 0.5 Zn 0.1 Fe 2 O 4 -SiO 2 -GA nanoparticles which could immobilize the PGA. The structure of the PGA protein was analyzed by the PyMol program and the immobilization strategy was determined. The conditions of PGA immobilization were investigated, including immobilization time and PGA concentration. Finally, the enzymological properties of the immobilized and free PGA were compared. The optimum catalytic pH of immobilized and free PGA was 8.0, and the optimum catalytic temperature of immobilized PGA was 50°C, 5°C higher than that of free PGA. Immobilized PGA in a certain pH and temperature range showed better catalytic stability. V max and K m of immobilized PGA were 0.3727 μmol·min -1 and 0.0436 mol·L -1 , and the corresponding free PGA were 0.7325 μmol·min -1 and 0.0227 mol·L -1 . After five cycles, the immobilized enzyme activity was still higher than 25%.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Bin Zhou,Qingsong Liu,Caihong Zheng,Yao Ge,Lili Huang,Haoyang Fu,Shengqiong Fang
For the efficient degradation of organic pollutants with the goal of reducing the water environment pollution, we employed an alkaline hydrothermal treatment on primeval g-C 3 N 4 to synthesize a hydroxyl-grafted g-C 3 N 4 (CN-0.5) material, from which we engineered a novel Fenton-like catalyst, known as Cu–CN-0.5. The introduction of numerous hydroxyl functional groups allowed the CN-0.5 substrate to stably fix active copper oxide particles through surface complexation, resulting in a low Cu leaching rate during a Cu–CN-0.5 Fenton-like process. A sequence of characterization techniques and theoretical calculations uncovered that interfacial complexation induced charge redistribution on the Cu–CN-0.5 surface. Specifically, some of the π electrons in the tris-s-triazine units were transferred to the copper oxide particles along the newly formed chemical bonds (C (π) -O-Cu), forming a π-deficient area on the tris-s-triazine plane near the complexation site. In a typical Cu–CN-0.5 Fenton-like process, a stable π-π interaction was established due to the favorable positive-negative match of electrostatic potential between the aromatic pollutants and π-deficient areas, leading to a significant improvement in Cu–CN-0.5's adsorption capacity for aromatic pollutants. Furthermore, pollutants also delivered electrons to the Cu–CN-0.5 Fenton-like system via a “through-space” approach, which suppressed the futile oxidation of H 2 O 2 in reducing the high-valent Cu 2+ and significantly improved the generation efficiency of • OH with high oxidative capacity. As expected, Cu–CN-0.5 not only exhibited an efficient Fenton degradation for several typical aromatic organic pollutants, but also demonstrated both a low metal leaching rate (0.12 mg/L) and a H 2 O 2 utilization rate exceeding 80%. The distinctive Fenton degradation mechanism substantiated the potential of the as-prepared material for effective wastewater treatment applications.
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Sustainability
·
2024
·Vol. 16
·期 10
·4231
·
IF 3.3
Ke Ren,Fangjie Ding,Lijun Zhang,Fengping Peng,Jianzhong Guo,Chunzheng Wu
The food industry is responsible for generating considerable amounts of waste, such as excess fruits and leftover sugars, which contribute to resource depletion and pose environmental challenges. This research delves into the application of gold-modified graphitic carbon nitride nanosheets (Au/CN) as a potent catalyst for the transformation of these food wastes into H2via piezoelectric reforming during sonication. Au/CN demonstrated a superior rate of H2evolution compared to pristine g-C3N4(i.e., 1533.3 vs. 364.9 µmol/g/h) and it maintained its efficiency through multiple cycles of use. The catalytic activity was found to be optimal at a neutral pH level and with increased sugar concentrations. The enhanced catalytic performance of Au/CN was ascribed to the efficient segregation of charge carriers as well as the reduced charge transfer distance. This study underscores the viability of using Au/CN as a means for converting food wastes into a sustainable source of H2energy.
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Water
·
2024
·Vol. 16
·期 10
·1372
·
IF 3
Rong Liu,Mingming Li,Jie Chen,Yu Yin,Wei Zhao,Zhanghao Gong,Hua Jin,Zhigang Liu
Residual drug pollutants in water environments represent a severe risk to human health, so developing a cheap, environmentally friendly, and effective photocatalyst to deal with them has become a hot topic. Herein, a magnetically separable Fe3O4@TiO2/g-C3N4photocatalyst with a special heterojunction structure was fabricated, and its photocatalytic performance was assessed by degrading tetracycline (TC). Compared to Fe3O4@TiO2, the synthesized Fe3O4@TiO2/g-C3N4exhibited superior TC degradation performance, which was primarily ascribed to the heterojunction formed between TiO2and g-C3N4and its ability to enhance the visible light absorption capacity and reduce the photoinduced electron/hole recombination rate. Moreover, a free radical capture experiment further confirmed that ·O2−and h+are the predominant components in the TC degradation reaction. Under UV–Vis irradiation, the TC degradation rate escalated to as high as 98% within 120 min. Moreover, Fe3O4@TiO2/g-C3N4was demonstrated to be easily recovered by magnetic separation without any notable loss even after five cycles, showing exceptional stability and reusability. These findings indicate that Fe3O4@TiO2/g-C3N4is a promising photocatalyst for environmental remediation that may provide a sustainable approach to degrading antibiotic pollutants in wastewater.
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Journal of Energy Storage
·
2025
·
IF 9.8
Jin-hua Zhang,Peng-jie Zhu,Yan-zhen Liu,Xiang-ru Zhu,Yong-feng Li,Cheng-Meng Chen
The construction of heterostructured energy storage and conversion with special morphology has the potential to be an up-and-coming area of research. In this study, we designed and synthesized a Co₃O₄/g-C₃N₄ heterostructured electrode material with a distinctive morphology using a multistep fabrication approach. The heterojunction formed between Co₃O₄ and g-C₃N₄ induces interfacial charge redistribution, resulting in a built-in electric field that facilitates efficient electron transfer and enhances the electronic structure. Furthermore, the engineered morphology, comprising nanocages and hollow tubes, significantly increases the number of electrochemically active sites. The optimized electrode achieved an impressive specific capacity of 921.8 F g −1 at a current density of 1 A g −1 , along with excellent cycling stability, retaining 82.88 % of its initial capacity after 10,000 cycles. Moreover, an asymmetric supercapacitor constructed with Co₃O₄/g-C₃N₄ as the positive electrode and activated carbon as the negative electrode demonstrated a stable and high energy density of 36.3 Wh kg −1 .
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Nanomaterials
·
2024
·Vol. 14
·期 24
·1996
·
IF 4.4
Dongxu Wang,Wanfeng Mao,Lihong Zhao,Duo Meng,Jiaqi Tang,Tengfei Wu
With the development of industry, agriculture, and aquaculture, excessive ammonia nitrogen mainly involving ionic ammonia (NH4+) and molecular ammonia (NH3) has inevitable access to the aquatic environment, posing a severe threat to water safety. Photocatalytic technology shows great advantages for ammonia nitrogen removal, such as its efficiency, reusability, low cost, and environmental friendliness. In this study, CP (g-C3N4/CoP) composite materials, which exhibited high-efficiency ammonia nitrogen removal, were synthesized through a simple self-assembly method. For the optimal CP-10 (10% CoP) samples, the removal rate of ammonia nitrogen reached up to 94.8% within 80 min under visible light illumination. In addition, the nitrogen selectivityS(N2)is about 60% for all oxidative products. The high performance of the CP-10 photocatalysts can be ascribed to the effective separation and transmission of electron–hole pairs caused by their heterogeneous structure. This research has significance for the application of photocatalysis for the remediation of ammonia nitrogen wastewater.
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