ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Shi-Wen Lv,Jialu Pan,Xiaoran Wang,Yifan Shao,Yanqing Cong,Lin Che
It is of great significance to establish an effective method for removing Cr(VI) from wastewater. Herein, Fe-doped g-C 3 N 4 (namely Fe-g–C 3 N 4 –2) was synthesized and then employed as photocatalyst to conduct the test of Cr(VI) reduction. Notably, the embedding of Fe ion in g-C 3 N 4 can offer the Fe 2+ /Fe 3+ redox couples, so reducing the interfacial resistance of charge transfer and suppressing the recombination of photogenerated electrons and holes. The impurity energy levels will form in g-C 3 N 4 after the introduction of Fe ion , thereby boosting the light absorption capacity of catalyst. Thus, Fe-g–C 3 N 4 –2 showed good performance in photocatalytic Cr(VI) reduction, and the reduction efficiency of Cr(VI) can reach 39.9% within 40 min. Different with many previous studies, current work unexpectedly found that the addition of p -benzoquinone (BQ) can promote the Cr(VI) reduction, and the reduction efficiency of Cr(VI) over Fe-g–C 3 N 4 –2 was as high as 93.2% in the presence of BQ (1.5 mM). Further analyses showed that BQ can be reduced to hydroquinone (HQ) by photogenerated electrons, and UV light can also directly induce BQ to generate HQ by using H 2 O as the hydrogen donor . The HQ with reducing ability can accelerate the Cr(VI) reduction. In short, current work shared some novel insights into photocatalytic Cr(VI) reduction in the presence of BQ. Future research should consider possible reactions between photogenerated electrons and BQ. For the UV-induced photocatalysis , the suitability of BQ as the scavenger of O 2 •‒ must be given carefully consideration.
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DIAMOND AND RELATED MATERIALS
·
2025
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IF 5.1
Yundong Qian,Tengda Lu,Ke Liu,Guangkai Lu,Jie Xiao,Xiaoyuan Zeng
The oxygen reduction reaction (ORR) electrocatalyst plays an important role in various renewable energy applications and energy conversion and storage fields. The design and synthesis of ORR catalysts with high activity, great stability, and low cost is a harsh challenge. Transition metal catalysts are deemed to be one of the promising alternatives to traditional Pt-based catalysts for oxygen reduction reactions. In this study, a nickel metal nanoparticle encapsulated by nitrogen-doped carbon tube composites (Ni/N-C-t) are fabricated by regulating the calcining temperature and using g-C 3 N 4 as precursor in the presence of nickel nitrate. The Ni/N-C-800 catalyst which is calcined at 800 °C exhibits the largest specific surface area (152.1 m 2 ·g −1 ), abundant defects, mesoporous structures and more active reaction sites, demonstrating excellent ORR performance (half-wave potential of 0.80 V) and good stability (current retention rate of 64 % after 66 h longevity test). The attributes of high content of Ni-N x , graphitic nitrogen, and pyridine nitrogen and largest specific surface area endow the catalyst of Ni/N-C-800 affluent reaction active sites and outstanding conductivity, thus boosting the ORR electrocatalytic performance. This study demonstrates a useful inspiration for the preparation of advanced oxygen reduction reaction electrocatalysts with g-C 3 N 4 derivatives.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 102
·期 4
·1749-1758
·
IF 3.34
Pan Xin,Wang Li,Ye Jiajie,Qin Song,He Bingfang
Penicillin G acylase (PGA) was isolated from Providencia rettgeri PX04 (PrPGApx04) and utilized for the kinetically controlled synthesis of β-lactam antibiotics. Site-directed mutagenesis was performed to increase the process efficiency. Molecular docking was carried out to speculate the key mutant positions corresponding with synthetic activity, which resulted in the achievement of an efficient mutant, βF24G. It yielded higher conversions than the wild-type enzyme in the synthesis of amoxicillin (95 versus 17.2%) and cefadroxil (95.4 versus 43.2%). The reaction time for achieving the maximum conversion decreased from 14 to 16 h to 2–2.5 h. Furthermore, the secondary hydrolysis of produced antibiotics was hardly observed. Kinetic analysis showed that the ( k cat / K m ) AD value for the activated acyl donor D-hydroxyphenylglycine methyl ester (D-HPGME) increased up to 41 times. In contrast, the ( k cat / K m ) Ps values for the products amoxicillin and cefadroxil decreased 6.5 and 21 times, respectively. Consequently, the α value ( k cat / K m ) Ps /( k cat / K m ) AD , which reflected the relative hydrolytic specificity of PGA for produced antibiotics with respect to the activated acyl donor, were only 0.028 and 0.043, respectively. The extremely low hydrolytic activity for the products of the βF24G mutant enabled greater product accumulation to occur during synthesis, which made it a promising enzyme for industrial applications.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Yuanyuan Liu,Shengyang Yang,Su-Na Yin,Ligang Feng,Yang Zang,Huaiguo Xue
Methanol has been deemed to be a favorable medium for the source of hydrogen because its liquid nature facilitates the storage, transportation, and utilization of hydrogen. Currently, steam reforming is the most common method to generate hydrogen from methanol in chemical industry and hydrogen fuel cell field. However, methanol reforming often involves high temperature and pressure, massive capital investment, as well as undesirable byproducts (CO, CO 2 , etc.) formation. To overcome these disadvantages, in this work, we describe an in situ assembly and stepwise thermal treatment method to synthesize fibrous AgNPs/g-C 3 N 4 aerogel, which exhibits efficient photocatalysis activity for the splitting of pure methanol at room temperature. Encouragingly, hydrogen is continuously produced while neither CO nor CO 2 is found in the products, which could be attributed to the moderate redox feature of silver in the AgNPs/g-C 3 N 4 aerogel. More importantly, this CO x -free hydrogen evolution process can prevent the poisoning of catalysts, opening a new opportunity for developing low-carbon chemistry.
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Ying-Di Luo,Qi-Lei Zhang,Shan-Jing Yao,Dong-Qiang Lin
This study investigated adsorption selectivity of immunoglobulin M (IgM), immunoglobulin A (IgA) and immunoglobulin (IgG) on four mixed-mode resins with the functional ligands of 4-mercatoethyl-pyridine (MEP), 2-mercapto-1-methylimidazole (MMI), 5-aminobenzimidazole (ABI) and tryptophan-5-aminobenzimidazole (W-ABI), respectively. IgM purification processes with mixed-mode resins were also proposed. All resins showed typical pH-dependent adsorption, and high adsorption capacity was found at pH 5.0–8.0 with low adsorption capacity under acidic conditions. Meanwhile, high selectivity of IgM/IgA and IgM/IgG was obtained with ABI-4FF and MMI-4FF resins at pH 4.0–5.0, which was used to develop a method for IgM, IgA and IgG separation by controlling loading and elution pH. Capture of monoclonal IgM from cell culture supernatant with ABI-4FF resins was studied and high purity (∼99%) and good recovery (80.8%) were obtained. Moreover, IgM direct separation from human serum with combined two-step chromatography (ABI-4FF and MMI-4FF) was investigated, and IgM purity of 65.2% and a purification factor of 28.3 were obtained after optimization. The antibody activity of IgM was maintained after purification. The results demonstrated that mixed-mode chromatography with specially-designed ligands is a promising way to improve adsorption selectivity and process efficiency of IgM purification from complex feedstock.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Rui Liu,Bolin Wu,Rijia Liu,Xin Zhang,Yuan Sun,Jing Ma
The accurate and real-time detection of antibiotics in the complex mixtures remain a significant challenge in the clinical drug monitoring, the food safety and the environmental surveillance. In this study, we developed an innovative electrochemical sensor platform, i.e. Ag/ZIF-67/g-C 3 N 4 /GCE, combined with the assistance of machine learning for the detection of chloramphenicol (CHL) in the practice pharmaceutical and urine samples. The incorporation of machine learning into the sensor design represents a key advancement, enabling the intelligent analysis and the enhanced sensing performance. The Ag/ZIF-67/g-C 3 N 4 composite electrode exhibited remarkable electrochemical properties, including a broad linear detection range (0.01–250.00 μmol L −1 ) and an ultralow detection limit of 5.32 nmol L −1 . The sensor demonstrated excellent selectivity, reproducibility and stability, even in the complex sample matrices. For practical application, the developed sensor achieved high recovery rates (98.00–103.00 % in the pharmaceutical samples and 96.67–103.33 % in the urine samples) with the standard deviations below 2.56 % and 2.26 %, respectively. More importantly, the artificial neural network (ANN), specifically the backpropagation (BP) neural network, was applied to analyze the collected sensor data, successfully predicting and validating the CHL sensing efficiency. This study highlights the synergistic combination of the advanced materials and machine learning for the intelligent and the accurate detection of antibiotics, paving ways for the AI-powered electrochemical sensing platforms with potential applications in both health monitoring and real-world sample analysis.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Yuan Li,Jie Zhang,Jie-lin Zhang,Jin-ya Fan,Qian Zhao,Qi-qi Chu,Shi-hong Zhong,Rui Gu
Bang Jian has a long-standing history of medicinal use, noted for its detoxifying effects and the treatment of various fevers, laryngitis, and thermal illnesses. Presently, Gentiana veitchiorum and G. szechenyii are the predominant varieties utilized. However, comparative data on their chemical compositions remains scarce. In this study, employing UPLC-Q-TOF/MS metabolomics, conducted a comprehensive comparison of the chemical constituents in G. veitchiorum and G. szechenyii and assessed their antioxidant activities. Results indicated both varieties exhibit significant antioxidant capabilities, with G. szechenyii displaying superior efficacy. The IC 50 values for DPPH, Hydroxyl, and ABTS in G. szechenyii were determined to be 0.16, 0.48, and 0.80 mg/mL, respectively. Through UPLC-Q-TOF/MS, 56 compounds were identified, revealing notable differences in metabolite composition between the two species. 24 differential metabolites were identified as potential chemometric markers, facilitating the accurate differentiation of G. veitchiorum and G. szechenyii . Correlation analyses identified six compounds—depressine, szechenyin A, syringic acid, isoorientin-2′'-O-glucopyranoside, isoscoparin 2″-O-glucoside, and naringenin—as significant to the variance in antioxidant activity. These findings enhance our understanding of the phytochemical and antioxidant properties of G. veitchiorum and G. szechenyii , offering a theoretical foundation for their clinical application.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Gang Huang,Danlin Zeng,Mengcheng Wei,Yang Chen,Aoxue Ma,Sirong Cheng
A novel nonmetal-based nanocomposite, protonated g-C 3 N 4 @CaCO 3 (CN-BPCC), was synthesized using a simple calcination method. The construction of this binary composite photocatalyst enhanced the adsorption and photocatalytic degradation performances of pure g-C 3 N 4 . The adsorption and photocatalytic degradation efficiencies under visible-light irradiation were analyzed using methylene blue (MB) as the target organic pollutant. The binary nanocomposite with 1.5 g of CaCO 3 (BPCC) exhibited high adsorption and photocatalytic performance, achieving approximately 100 % degradation of MB under 90 min of xenon lamp irradiation. Furthermore, the nanocomposite displayed enhanced visible-light utilization efficiency and improved separation efficiency of photogenerated carriers. The adsorption and photocatalytic degradation mechanisms were investigated through radical trapping experiments and electron spin resonance (ESR) spectroscopy. Furthermore, the binary CN-BPCC nanocomposite exhibited exceptional reusability after regeneration, indicating its potential as a promising photocatalyst for the treatment of wastewater containing organic pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Xiyuan Gao,Lei Sun,Pengyu Hao,Shunhong Zhang,Yu Shen,Jianhua Hou,Feng Guo,Chunsheng Li,Weilong Shi
The utilization of solar evaporator for interfacial seawater evaporation and wastewater treatment presents a promising concept; however, inadequate evaporation and degradation rates and complicated preparation procedures significantly hinder its practical application. Herein, the black g-C 3 N 4 /loofah/chitosan (BCN/LF/CS) hydrogel as an efficient dual-function solar evaporator was constructed for desalination coupled with antibiotic degradation. The experimental results show that in 3.5 wt% NaCl solution, the effective evaporation rate of optimal BCN-1/LF/CS evaporator can reach 2.1 kg m −2 h −1 , and maintaining 91.4 % degradation of tetracycline (TC) solution (50 mg/L) within 6 h irradiation. This work introduced here combines the advantages of photothermal evaporation and photocatalytic degradation to obtain fresh water from a complicated water environment, providing inspiration for future exploration of photocatalyst construction and extensive application in wastewater purification.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhe Yin,Huanyu Chen,Qiuyu Wang,Ziwen Wang,Guoping Yu,Binglin Tang,Man Zhang,Kangzheng Li,Zhichao Zhang,Qingcheng Luo,Tianding Hu,Bo Lv
Converting plastics into organic matter by photoreforming is an emerging way to deal with plastic pollution and produce valuable organic matter. Water shortage can be alleviated by using seawater resources. To solve these problems, we synthesize a ternary heterostructure composite g-C 3 N 4 /CdS/NiS. Heterojunctions are formed between graphitized carbon nitride (g-C 3 N 4 ), cadmium sulfide (CdS) and nickel sulfide (NiS), which effectively improve the problem of fast charge recombination of pure g-C 3 N 4 and CdS. The results of the g-C 3 N 4 /CdS/NiS photocatalytic tests show that the hydrogen production rates in seawater and pure water for 5 h are 30.44 and 25.79 mmol/g/h, respectively. In stability test, the hydrogen production rate of the g-C 3 N 4 /CdS/NiS in seawater and pure water is similar. This suggests that seawater can replace pure water as a source of hydrogen. While H 2 is generated, the lactate obtained by polylactic acid (PLA) hydrolysis is oxidized to form small organic compounds such as formate, acetate and pyruvate. Our study shows that g-C 3 N 4 /CdS/NiS can not only use seawater as a hydrogen source to produce H 2 , but also photoreformate plastics dissolved in seawater into valuable small organic molecules. This has a positive impact on the production and use of clean energy, as well as on plastic pollution and water scarcity.
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Applied Materials Today
·
2024
·
IF 7.2
Guobo Huang,Siqi Huo,Jiahao Ren,Wei Chen,Haiqin Yang,Shenwei Xiao,Tianle Wang,Hong Peng,Pingan Song
The nanomaterials have been deeply explored as flame retardants for various polymeric materials due to their multifunctionality, but they often fail to significantly increase the limiting oxygen index (LOI) and vertical burning UL-94 rating, thus unable to meet industrial needs (LOI>27.0 % and UL-94 V-0 rating). Herein, we fabricated a cerium/phosphorus-doped g-C 3 N 4 (Ce/P-CN) nanohybrid as a multifunctional high-efficiency fire retardant for acrylonitrile–butadiene–styrene (ABS). The Ce/P-CN nanoflakes featured a strengthening effect towards ABS, 10 wt% of which increased the tensile strength of ABS/(Ce/P-CN) by 33.8 %. Meanwhile, the ABS/(Ce/P-CN) nanocomposites showed remarkably enhanced high-temperature stability and carbonization performances relative to virgin ABS. Ce/P-CN simultaneously improved the anti-ignition, fire retardancy and smoke suppression of ABS due to the barrier effect of g-C 3 N 4 nanoflakes and the catalytic carbonization effect of cerium and phosphorus. Notably, adding 10 wt% Ce/P-CN increased the LOI and UL-94 rating of ABS to 28.6 % and V-0, respectively, demonstrating its high flame-retardant efficiency. Thus, the high flame-retardant efficiency and multifunctionality enable Ce/P-CN to outperform previous flame retardants for ABS. This work offers a novel strategy for the development of high-efficiency g-C 3 N 4 nanoflakes, which endow ABS with improved mechanical robustness and fire retardancy and show broad industrial prospects.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xuanxuan Hao,Zhimin Liu,Yaxin Li,Waner Hou,Tongtong Zheng,Leqian Hu
In this study, a near-infrared (NIR) electrochemiluminescence (ECL) emitter CdIn 2 S 4 was synthesized by a convenient hydrothermal strategy. The ECL properties of the obtained CdIn 2 S 4 were examined in the presence of potassium persulfate coreactant at an excitation potential of − 1.25 V. The low trigger voltage of CdIn 2 S 4 may be ascribed to its lower bandgap. This lower excitation potential could effectively reduce the side-effects induced by high voltages, while maintaining the biological activity of antibodides and antigens. The ECL features of CdIn 2 S 4 were also investigated, demonstrating that CdIn 2 S 4 exhibited excellent NIR characteristics, and surface state transitions led to the ECL emission. Importantly, CdIn 2 S 4 was introduced into ECL and electrochemical impedance spectroscopy (EIS) to establish a dual-mode immunosensing interface. Meanwhile, AuNPs@g-C 3 N 4 with excellent properties were used to promote electron transmission and increase the immobilization amount of zearalenone (ZEA) antibodies in the dual-mode sensing system. The developed immunosensing strategy displayed superior sensing performance in ZEA analysis. The detection limits of ZEA were 30 fg mL −1 (ECL model) and 10 fg mL −1 (EIS model), respectively. The desirable recovery results of ZEA in corn samples prove the application potential of the NIR emitter CdIn 2 S 4 in developing a dual-mode immunosensing system for early real-time use.
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