JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 40
·e52813
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IF 3.057
Hongbin Li,Jiliang Dai,Yue Hu,Heshan Zheng,Xiumin Ge,Yongqiang Guo,Shuzhen Gao,Chao Liu
Herein, the poly(vinylidene fluoride) (PVDF) composite membranes blended with pineapple leaf nanocrystalline cellulose (PLNC) and g-C 3 N 4 for ultrafiltration were designed and fabricated via surface segregation during non-solvent induced phase separation. The incorporation of PLNC and g-C 3 N 4 endows the PVDF composite membrane with a higher porosity, enhancing the pure water flux of PVDF/g-C 3 N 4 /PLNC membrane by 256.75% compared to the PVDF membrane, while maintaining a higher water flux recoveries of 82.1%. Moreover, surface chemical compositions, surface and cross-section morphologies, degree of crystallinity were also characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction, respectively. The mechanical properties of the PVDF composite membranes were also investigated. All the above experimental data showed that the addition of PLNC and g-C 3 N 4 can greatly improve the performance of the PVDF membrane. The prepared modified membrane has potential application value in the field of wastewater separation and treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
·
IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Lanqing Deng,Lang Chen,Liangdi Zhu,Yang Li,Jie Ou-Yang,Shaofeng Wu,Peng Chen,Sheng Shen,Junkang Guo,Yongbo Zhou,Chak-Tong Au,Shuang-Feng Yin
Being extensively applied in various fields of chemistry and chemical industry, the development of a green and versatile method for the synthesis of amides is in line with the demand of sustainable chemistry. Herein, a direct, highly selective, and scale-up (5–20 mmol) method for photocatalytic synthesis of amides through aerobic oxidative amination of alcohols with amines was developed under visible light, room temperature, using air as the oxidant. Benefiting from the adsorption of sodium hemiaminal on catalyst lengthens the C H bond (1.148 Å), this novel process is feasible for a broad range of functionlized amides (69 examples), especially those for drug manufacture (e.g., moclobemide and pipobroman). Imines was almost prevented with excellent amide selectivity up to 99 % could be ascribed to the low energy barrier for hemiaminal dehydrogenation while that for dehydration is high (2.13 eV). This green and efficient protocol represents an ideal alternative to the currently known methods.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xiaochun Zheng,Yidi Wang,Shoutian Ren,Qixiao Gai,Wenjun Liu,Quanli Dong
Interface defects are one of the main factors for inefficient photoelectric conversion of nanocomposites, which is also suitable for the photocatalytic nanosystem containing photosensitizers and co-catalysts, so the efficient passivation of interface defects can enhance their photocatalytic performance. In this work, P-doped C3N4 (P–C3N4) was prepared by the thermal polymerization of urea with phytic acid as the P doping source. Then, the doped P atoms could act as anchoring sites for photodeposited Ni nanoparticles (NPs) on P–C3N4, and Ni–P–N bonds were spontaneously formed between Ni NPs and P–C3N4 with doped P as the bridging ligand. The optimal H2 evolution rate of P–C3N4/Ni-20 is 1.56 mmol g–1 h–1, which is 52.0 and 6.0 times that of C3N4 and C3N4/Ni-30, respectively, and even 2.0 times that of P–C3N4/Pt-2%. Its apparent quantum efficiency of 4.35% at 420 nm was 6.9 times that of reference C3N4/Ni-30 without P doping. The optimized interface transfer of carriers by the formed Ni–P–N bonds between P–C3N4 and Ni NPs was the main factor for the enhanced photocatalytic performance of C3N4.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Tang Zhou,Lei Zhao,Dingsheng Wu,Quan Feng,Baobao Zhao
As an emerging and promising technology , photocatalytic technology can effectively remove trace organic pollutants such as tetracycline hydrochloride (TC-H, an antibiotic) in water. However, the research on photocatalysis is mainly focused on the powder photocatalyst, which is difficult to separate from the water body after use. Generally, fixing the photocatalytic material on a specific carrier can effectively avoid the above problems. In this article, we uniformly assembled g-C 3 N 4 on bacterial cellulose (BC) with 3D nanofiber network and enhance its catalytic activity by polypyrrole (PPy). Different from the modification of the photocatalyst in most studies, we have effectively improved the catalytic activity through the design of the support material and reactor in this work. The PPy@(BC/g-C 3 N 4 ) flexible membrane prepared has high-efficiency catalytic performance (64.28%, 2 h, TC-H) under a low-power xenon lamp (λ > 420 nm) in the reactor designed, which is 5.27 times the catalytic efficiency of the original BC/g-C 3 N 4 (12.20%, 2 h, TC-H). After 10 times of repeated use, it can stably retain more than 80% of the initial catalytic activity. Specifically, we propose to introduce oxygen in the active substrate generation stage and construct a photoelectrocatalytic reaction cell. This study can be used as a general strategy to prepare flexible membrane materials with high-efficiency catalytic properties.
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ChemCatChem
·
2022
·Vol. 14
·期 10
·e202200063
·
IF 5.497
Liyan Wang,Sheng-Qi Guo,Zhenzhong Hu,Boxiong Shen,Wei Zhou
Graphical Biomass waste-derived electrocatalyst : A biomass waste-derived N-doped honeycomb-like carbon electrocatalyst by one-step pyrolysis. g-C 3 N 4 is used as a multifunctional template to control the morphology of the catalyst and provide a source of N. The catalyst delivers remarkable ORR activity and zinc-air battery performance with fast discharge and higher current density. Exploring an effective way to convert biomass waste into highly active oxygen reduction reaction (ORR) electrocatalysts will not only benefit alleviating environmental management pressure, but also open up new ways for the development of alternatives to Pt-based catalysts. Although the traditional pyrolysis conversion method has been proved to be stable and feasible, the low electrocatalytic activity of the product and the cumbersome post-treatment process make it difficult to be popularized. Here, we report an effective method to overcome the mentioned drawbacks: the introduction of g-C 3 N 4 . The experimental results confirm that g-C 3 N 4 can be used as a multifunctional template for adjusting the morphology and providing N source. More importantly, it will decompose at 700 °C and avoid post-treatment of residues. The pyrolysis products assisted by g-C 3 N 4 exhibit similar ORR performances to commercial Pt/C, including onset potential of 0.963 V (vs. RHE), half-wave potential of 0.835 V (vs. RHE) and limiting current density of 6.35 mA ⋅ cm −2 . Impressively, the product displayed outstanding performance on output power density (107 mW ⋅ cm −2 ) and discharge performance at different current densities as the air electrode of zinc-air battery, which even superior to that of commercial Pt/C. This study elucidated the functional role of g-C 3 N 4 in reaction system and facilitated the development of more efficient biomass waste-based ORR electrocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yukun Li,Dan Zhang,Qishi Chen,Cong Chao,Junhong Sun,Shuying Dong,Yuyang Sun
In this study, reduced graphene oxide-based graphitic carbon nitride (rGO/g-C 3 N 4 ) composite was fabricated via thermal polymerization-hydrothermal method and were utilized to activate peroxydisulfate (PDS) under simulated solar light irradiation. The as-synthesized rGO/g-C 3 N 4 was demonstrated to effectively remove methyl orange (MO) in wastewater. Notably, 92.3% of MO (15 mg/L) was removed within 120 min in the presence of 0.2 g/L rGO/g-C 3 N 4 and 0.225 g/L PDS. The influence of activator dosage, PDS concentration and co-existing solution matrix on the removal efficiency was investigated. Free radical capture experiments confirmed that SO 4 ¯ · , photogenerated holes (h + ), O 2 ¯ · and non-radical reaction initiated by rGO played a major role in MO removal. Furthermore, PDS and rGO acted as the electron acceptor and transfer carrier of the photogenerated charges, respectively, resulting in the efficient activation of PDS. The promoting visible light absorption might be ascribed to the defect sites on the surface of rGO/g-C 3 N 4 , which generated from the rGO loading. This study revealed that the as-synthesized rGO/g-C 3 N 4 composite exhibits wide promising application prospects as a photocatalytic activator of PDS for the degradation of azo dyes in textile wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hao Zhang,Meng Liu,Xingyang Zhang,Biao Yuan,Pan Wu,Changjun Liu,Wei Jiang
Hydrogen peroxide (H 2 O 2 ) can be photocatalytically generated by oxygen in water with fatty alcohols as a sacrificial agent; however, it is expensive to separate because of the miscibility of fatty alcohols and water. In this work, H 2 O 2 is directly generated photocatalytically using amphiphilic graphitic carbon nitride (g-C 3 N 4 ) and oxygen in pure anhydrous oily benzyl alcohol (BA) alone; it is simply extracted by water and separated using a hydrophobic/lipophilic mesh to obtain a high-concentration H 2 O 2 aqueous solution. The results show that the H 2 O 2 concentration in BA after 4 h of photoreaction is 9.45 mM and that of the final solution product can be as high as 70.93 mM in water. Water does not enhance the photoreaction; instead, unexpectedly, it weakens it. However, it is possible to completely extract the H 2 O 2 from the reacted BA. In this study, the H 2 O 2 solution is rapidly separated from the BA with a separation efficiency of 99.97% using a hydrophobic mesh. The photocatalyst g-C 3 N 4 is present at the water/BA interface owing to its amphiphilicity, and it can be caught by the mesh during separation and reused after backwashing. The combined photoreaction, extraction, and separation processes provide a simple, environment-friendly, and rapid H 2 O 2 photogeneration process for the on-site production of a usable H 2 O 2 solution.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Longlong Zhu,Pei-jiang Zhou,Chaoqi Chen
In recent years, modification of graphite carbon nitride (g-C 3 N 4 ) has drawn considerable attention because of its catalytic potential. In this study, rectorite was designed as a carrier for g-C 3 N 4 , and g-C 3 N 4 /rectorite was synthesized via pyrolysis under nitrogen protection. The efficiency of g-C 3 N 4 /rectorite for peroxymonosulfate (PMS) activation was evaluated using acid Orange 7 dye (AO7) as a model organic contaminant . Material characterization suggested the successful synthesis of g-C 3 N 4 /rectorite. The removal of AO7 was significantly enhanced by the composite, compared to pure g-C 3 N 4 , rectorite, or their physical mixture. The g-C 3 N 4 content in the composite affected its catalytic ability, while the g-C 3 N 4 /rectorite with 41% g-C 3 N 4 content showed the highest catalytic efficiency. Furthermore, the removal of AO7 was affected by catalyst concentration, oxidant concentration, and solution pH. Notably, under the optimized condition (i.e., 0.8 g/L of g-C 3 N 4 /rectorite, 0.20 mg/L of PMS , and 6.0 of pH), an initial concentration of 50 mg/L AO7 was removed to a level below the detection limit (i.e., 0.25 mg/L) within 8 min. A recycling test demonstrated the reusability of the g-C 3 N 4 /rectorite in six repeated reactions. Singlet oxygen played a key role in PMS activation, suggesting that the non-radical degraded process is the dominated AO7 removal pathway. The rectorite has a confined effect preventing g-C 3 N 4 from agglomeration, inhibiting the electron-hole recombination, and improve the exposure of active sites such as C O groups, -OH groups, and pyridinic N. Overall, g-C 3 N 4 /rectorite is a low-cost and environment-friendly catalyst exhibiting high catalytic activity for PMS activation to remove organic contaminants in water.
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NANO
·
2022
·
IF 1.438
Mengfan Wang,Wenbo Miao,Hongliang Xu,Chaoning Huang,Mingliang Li,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
g–C 3 N 4 nanosheets were first synthesized by calcining the mixture of hydrochloric acid-pretreated melamine and ammonium chloride. Then, by the aiding of solvothermal method and hydrofluoric acid as morphology modifier, 001-TiO 2 /g–C 3 N 4 (TCN-X, X = 5 , 3, 2, 1) nanocomposites were synthesized using g–C 3 N 4 nanosheets and tetrabutyl titanate, with the mass ratio of g–C 3 N 4 to TiO 2 was 5:1, 3:1, 2:1 and 1:1, respectively. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption method, ultraviolet–visible diffuse reflectance spectrum, photoluminescence spectrum, etc. Their photocatalytic properties were evaluated under visible light irradiation with rhodamine B (RhB) as the target pollutant. The results reveal that the TCN-3 composites had a large specific surface area of 67.38 m 2 /g and consisted of g–C 3 N 4 nanosheets and anatase TiO 2 crystals about 10–20 nm in size. The (001) crystal planes of TiO 2 can be easily observed in TCN-X composites. All TiO 2 /g–C 3 N 4 composites exhibited excellent photocatalytic activity compared with the pure g–C 3 N 4 did. The photocatalytic property of TCN-X samples varied with the mass ratio of g–C 3 N 4 to TiO 2 , and TCN-3 presented the optimum photocatalytic performance. In total, 50 mg of TCN-3 completely degraded 50 mL and 100 mL of RhB solution (10 mg/L) in 15 min and 40 min, respectively. The reaction rate constant of TCN-3 was 6.7 times as large as that of pure g–C 3 N 4 . TCN-3 also presented outstanding activity for the photocatalytic degradation of the colorless tetracycline solution. The significant improvement in photocatalytic activity of TCN-3 was attributed to the evenly distribution of TiO 2 on g–C 3 N 4 , the enhanced specific surface area and the construction of 001-TiO 2 /g–C 3 N 4 heterojunction between the g–C 3 N 4 nanosheets and the (001) crystal planes of anatase TiO 2 , which greatly reduced the recombination rate of the photo-generated electron and hole.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yingshan Zeng,Qiao Yin,Zhi Liu,Hao Dong
The rational utilization of graphitic carbon nitride (g-C 3 N 4 ) and quantum dots (QDs) semiconductors to highlight their merits as efficient photocatalysts remains attractive and challenging. Targeted integration of g-C 3 N 4 and QDs with expanded interfacial contact and multi-channel electron transfer is an effective means to boost the transfer efficiency of photogenerated electrons and achieve prominent photocatalytic activity. In this article, novel attapulgite (ATP)-interpenetrated Bi 2 WO 6 QDs/g-C 3 N 4 nanocomposites (BWQ/g-C 3 N 4 /ATP, designated as BCAs) are successfully fabricated through a simple and effective in situ hydrothermal growth method. The nanorod-structured ATP acts as numerous bridges to intercalate into the interlayers and expands inner space of g-C 3 N 4 . Theoretical calculation results indicate that an interfacial internal electric field (IEF) is formed where electrons transfer from g-C 3 N 4 to Bi 2 WO 6 . Originating from the intact interfacial contact of the expanded g-C 3 N 4 and highly dispersed BWQ with reinforcing electronic transferability of ATP, the optimal sample of BCA5 with higher specific surface area, more active sites and electron transfer channels, and stronger light harvestability, exhibits a nearly-100% degradation of organic contaminant of 2-Mercaptobenzothiazole in water, 35-, 17- and 3-fold rate constant higher than that the pristine g-C 3 N 4 , BWQ and Bi 2 WO 6 /g-C 3 N 4 counterparts, respectively. Various characterization techniques are employed to put forward the mechanisms in depth on MBT degradation route and IEF-induced photocatalytic Z-scheme over the BCA5 under photoexcitation.
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CHEMOSPHERE
·
2021
·
IF 7.086
Cui Lai,Huchuan Yan,Dongbo Wang,Shiyu Liu,Xuerong Zhou,Xiaopei Li,Mingming Zhang,Ling Li,Yukui Fu,Fuhang Xu,Xiaofeng Yang,Xiuqin Huo
Peroxymonosulfate (PMS)-based advanced oxidation processes for wastewater treatment have received extensive attention in the past years. Here, a novel Mn, Ce co-modified g-C 3 N 4 (MnCe-CN) composite was successfully synthesized by one-step pyrolysis for activating PMS. The physical and chemical characterization of MnCe-CN/PMS was conducted, indicating that Mn and Ce were evenly distributed on g-C 3 N 4 and existed in the form of Mn-N structure and CeO 2 , respectively. The MnCe-CN/PMS system could effectively degrade pollutants such as acetaminophen (ACT), methylparaben (MeP), p -nitrophenol (PNP), and 2,4-dichlorophenol (2,4-DCP). Among them, 2,4-DCP could be rapidly degraded, reaching 100% within 30 min. The masking experiments and electrochemical testing results revealed that 2,4-DCP was degraded via superoxide radicals (O 2 ˙ˉ), singlet oxygen ( 1 O 2 ), and electron transfer path. The cyclic experiments and real water treatment experiments testified that the oxidative system had excellent stability and applicability. This study provides a facile synthetic method to fabricate bimetallic co-modified g-C 3 N 4 for the enhancement of PMS activation .
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PubMed
高影响因子
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