Journal of Water Process Engineering
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2024
·
IF 6.3
Junjie Su,Qi Yang,Zhihu Zhang,Ziyue Zhang
Nowadays, Ni/Fe bimetallic nanocomposites have shown great potential for removing Cr(VI). However, the action of Ni 0 in Cr(VI) removal is still controversial, which was studied in this work. In this study, Ni/Fe@Fe 3 O 4 -g-C 3 N 4 (NFFOCN) nanocomposites were applied to remove Cr(VI) from aqueous solutions and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. Batch experiments were conducted to evaluate the Cr(VI) removal performance. Experimental results demonstrated that under optimal operating conditions (pH 5.5, 10 mg/L Cr(VI), 0.3 g/L NFFOCN, 30°C), a Cr(VI) removal efficiency of 90.78% was achieved within 50 min. Theoretical maximum adsorption capacity was calculated to be 36.101 mg/g. Combining experimental and characterization results, it could be concluded that Cr(VI) removal was attributed to the synergistic effect of the NFFOCN components. Ni 0 not only participated directly in the reduction of Cr(VI) as an electron donor, but also converted the corrosion product H 2 of nano-zero-valent iron (nZVI) into highly reducible atomic hydrogen (·H) to remove Cr(VI). Additionally, Ni 0 could form a primary battery with nZVI, facilitating the electron transfer between nZVI and Cr(VI). NZVI and its derivatives, Fe 2+ ions and green rust, were responsible for Cr(VI) reduction. Furthermore, the presence of Fe 3 O 4 and carbon nitride (g-C 3 N 4 ) improved the stability and reactivity of the nanocomposites.
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JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Mingjiao Li,Xinyi Chen,Qiyang Feng,Wanyi Fan,Yitong Ding,Ze Kan,Zhibo Li
Synthetic poly(4-hydroxybutyrate) (P4HB), a flexible and biodegradable polymer, shows great promise in improving the toughness of poly(lactic acid) (PLA), but the inherent immiscibility of PLA and P4HB compromises the toughening efficiency. To address this issue, P4HB grafted glycidyl methacrylate (P4HB-g-GMA) is synthesized for the purpose of enhancing the compatibility within the PLA/P4HB blend. The epoxy groups on P4HB-g-GMA can form strong chemical bonds with PLA chains and remain compatible with P4HB. Rheological data confirm that adding P4HB-g-GMA enhances polymer chain entanglement. Therefore, the phase interface of the blend becomes more diffuse, leading to improved mechanical performance. Specifically, a 3D-printed PLA/P4HB/P4HB-g-GMA blend containing 8% P4HB-g-GMA (PLA/P4HB/G8) achieves an elongation at break of 161.5%, approximately 22.7 times higher than that of a PLA/P4HB blend without the modifier. Moreover, the PLA/P4HB/G8 blends show a higher volume expansion ratio (VER) and better cell morphology due to the increased melt strength from P4HB-g-GMA. This study demonstrates a simple and efficient method to improve the compatibility between PLA and P4HB, resulting in superior mechanical performance of PLA/P4HB blends and broadening their potential applications in foaming. Graphical
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Feng He,Qianxiang Xiao,Yin Chen,Hongqing Wang,Xiangke Wang
In the photoreduction of U(VI), protective gases and additional sacrificial agents are still the major obstacles. Herein, we developed an oxygen-deficient WO x /g-C 3 N 4 catalyst for the simultaneous reduction of U(VI) and preparation of benzaldehyde by selective oxidation of benzyl alcohol without protective gases and sacrificial agents. The removal of U(VI) by WO x /g-C 3 N 4 could reach 98.5% and the conversion of benzyl alcohol was nearly 32% with a selectivity close to 100%. Compared with single g-C 3 N 4 and defect-free WO 3 , the photoreduction activity of WO x /g-C 3 N 4 was 10.4 and 7 times higher, respectively. Besides, the role of oxygen and oxygen defects was explored. Owing to oxygen defects in the catalyst, oxygen was adsorbed on the oxidation end (WO x ) of the catalyst and activated without entering the reduction end to interfere with the photoreduction of U(VI), while favoring the generation of •O 2 - to improve the selectivity of benzaldehyde. Finally, a new mechanism was proposed.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Lihong Tan,Xinhe Wu,Jiachao Xu,Mahmoud Sayed,Guohong Wang
The construction of crystalline/amorphous g-C 3 N 4 homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier movement resistance for optimized photocatalytic activity. However, the process entails a complex multi-step workup, which compromises its feasibility. To overcome this challenge, this work provided an innovative Na 2 CO 3 -induced crystallinity modulation strategy to construct a Na-doped crystalline/amorphous g-C 3 N 4 S-scheme homojunction photocatalyst in a single step. The approach involves the initial pre-assembling of melamine and cyanuric acid molecules, and subsequent introduction of Na 2 CO 3 before the calcination. Na 2 CO 3 plays key roles to induce in-situ crystallinity modulation during the calcination and as a source for Na-doping. The prepared g-C 3 N 4 S-scheme homojunction photocatalyst demonstrated a prominent H 2 O 2 -production rate of 444.6 μmol·L –1 ·h –1 , which is 6.1-fold higher than that of bulk g-C 3 N 4 . The enhanced activity was attributed to the synergistic effect of charge carrier separation induced by the S-scheme homojunction system, and the optimized interfacial H 2 O 2 generation kinetics. The latter was fostered by the Na-doping. This study provides an innovative approach for the one-step construction of g-C 3 N 4 S-scheme homojunction and its integration in photocatalytic applications.
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Nanomaterials
·
2025
·Vol. 15
·期 19
·1465
·
IF 4.3
Nannan Zheng,Yulan Zhang,Chunlei Dong,Zhiming Chen,Jianbin Chen
Fe–porphyrin/g-C3N4composites have emerged as promising visible-light photocatalysts, but their performance remains limited by inefficient charge separation and low reactive oxygen species (ROS) yield. Here, iron–tetra(4-carboxyphenyl) porphyrin (Fe–TCPP) was coupled with g-C3N4nanotubes (CNNTs) via a facile self-assembly strategy, creating a morphology-coordinated system. Comprehensive characterization (XRD, FTIR, SEM/TEM, BET, UV–Vis diffuse reflectance, PL, XPS, and EPR) confirmed the structural integrity, electronic coupling, and ROS generation capability of the composites. Fe–TCPP incorporation narrowed the bandgap from 2.78 to 2.56 eV, prolonged the average carrier lifetime from 6.3 to 7.5 ns, and significantly enhanced the generation of •OH and1O2. The optimized 1 wt% Fe–TCPP@CNNTs achieved complete Rhodamine B degradation within 30 min under visible light, with the highest two-stage apparent rate constants (k1= 0.0964 min−1, k2= 0.328 min−1). In addition, the hybrids retained over 90% activity after six consecutive runs, confirming their stability and recyclability. The synergistic effect of Fe–N coordination and nanotubular architecture thus promotes light harvesting, charge separation, and ROS utilization, offering a promising design principle for high-performance photocatalysts in environmental remediation.
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PubMed
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Qingyou Cai,Fanfan Wang,Jingying Ge,Zhiguo Xu,Mei Li,Hui Xu,Hua Wang
Herein, we reported the G-wire-based self-quenched fluorescence probe and its application in ultrasensitive microRNA (miRNA) detection by combining with target-activated isothermal cascade amplification. The terminal-single-fluorescein (FAM)-labeled G-rich oligonucletides self-assembled into G-wire nanostructures (G-wires) with K + and Mg 2+ . Thereafter, the G-wires brought terminal-labeled FAM into close proximity, as a result, the self-quenched signal probe formed. Besides, when there was the target miRNA, target-activated isothermal cascade amplification converted miRNA into the copious trigger DNA. After hybridization between trigger DNA and the self-quenched probe, the G-wires were splited and forced the apart of proximate FAM, and then the self-quenched probe displayed an “on” mechanism. Therefore, the approach gave a limit of detection (LOM) of 0.82 aM to miRNA-21 and could be implemented within a wide linear range of 2 aM to 2 nM. This approach was able to distinguish the single-mismatched miRNA-21, which was selective and sensitive in detecting human spiked serum samples.
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PubMed
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RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 65
·期 8
·1186-1195
·
IF 0.94
Xue-Wen Liu,Liu Ning-Yi,Deng Yuan-Qing,Wang Shan,Liu Ting
Abstract Two ruthenium complexes containing nitro-substituted ligand, [Ru(bpy) 2 (hnpip)](PF 6 ) 2 ( 1 ) and [Ru(phen) 2 (hnpip)](PF 6 ) 2 ( 2 ) (bpy = 2,2'-bipyridine; phen = 1,10-phenanthroline; hnpip = 2-(3-hydroxyl- 4-nitrophenyl)imidazo[4,5- f ][1,10-phenanthroline] were synthesized and characterized. DNA binding behaviors were studied by luminescent titration, UV-vis titration, FRET (FRET = Fluorescence resonance energy transfer) and molecular docking experiments. Complex 2 exhibited “light switch” effect upon addition of G-quadruplex DNA and displayed fluorescent selectivity towards G-quadruplex DNA over other DNAs in the presence of K 4 [Fe(CN) 6 ]. Fluorescence experiments, FRET experiments and molecular docking results indicated that the selectivity may be attributed to protection of nitro group from water, DNA affinity and the difference in DNA structures. Furthermore, both complexes were found to cleave DNA under irradiation by the formation of singlet oxygen. DNA topoisomerase inhibition experiments indicated that complex 2 exhibited higher topoisomerase I inhibition activity (IC 50 = 18 μM) than complex 1 (IC 50 = 50 μM). Docking studies revealed that complex 2 stabilized Top1cc complex via π–π interaction and the formation of hydrogen bond.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Qian Bi,Feng Qiu,Ruo Yuan,Yun Xiang
The abnormal variation of the concentration of acid phosphatase (ACP) in human body can be related to several pathophysiological diseases. Herein, a highly sensitive and non-label electrochemical biosensor for detecting ACP on the basis of target-induced inhibition of metal ion/pyrophosphate (PPi) coordination and G-quadruplex/hemin nanowires signal amplification is described. The target ACP molecules can hydrolyze PPi into phosphate to prevent the coordination between Cu 2+ and PPi, and the un-coordinated Cu 2+ further triggers cyclic cleavage of a G-quadruplex sequence (GS)-containing hairpin probes by the Cu 2+ -dependent DNAzyems on the sensor electrode to release the GS, which leads to in situ formation of the GS/hemin nanowires via the stacking of the free GS on the surface-immobilized GS with the presence of hemin . The many hemin molecules in the nanowires can thus yield dramatically enhanced current response for detecting ACP sensitively with the detection limit of 0.45 U/L. Besides, low levels of ACP present in diluted serum samples can also be selectively detected with this method. In addition to its sensitivity and selectivity, the developed method can realize substantial signal amplifications without using enzymes or nanomaterials, which can facilitate the establishment of convenient and sensitive strategies for detecting low concentrations of phosphatase for disease diagnosis.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Sobia Niazi,Imran Mahmood Khan,Ye Yu,Imran Pasha,Yan Lv,Ali Mohsin,Bilal Sajid Mushtaq,Zhouping Wang
Aflatoxin M 1 is a prevailing natural carcinogenic mycotoxin, found in milk. Herein, we reported a sensitive fluorescent aptasensor for AFM 1 , based on rolling circle amplification (RCA) technology to improve the sensitivity of the assay. The detection of AFM 1 was achieved using KYF 4 : Eu 3+ time-resolved fluorescent nanoparticles (KYF 4 : Eu 3+ TRFNPs) as signal probe and graphitic carbon nitride (g-C 3 N 4 ) nanosheet as a quencher. The AFM 1 aptamer act as a recognition element and as a primer for DNA synthesis. TRFNPs attached to complementary DNA (TRFNPs-cDNA) acts as a signal probe. In the absence of target, a rolling circle template (RCT) ligated to aptamer and RCA reaction initiated. The TRFNPs-cDNA was strengthened to amplified RCA product (RCAP) to make RCAP/TRFNPs-cDNA duplex. This duplex cannot be adsorbed onto g-C 3 N 4 , and ultimately no fluorescence quenched. In the presence of AFM 1 , aptamer recognized the target and aptamer-target complex was formed. Hence, no aptamer hybridized with RCT, therefore, no RCA and duplex formation. Consequently, free TRFNPs-cDNA adsorbed onto g-C 3 N 4 and resulted in quenched fluorescence. The assay provides a lower detection limit (0.0194 pg/mL) than the previously reported assays and has good recoveries between 92–99.8 %. Hence, the present method would be a suitable method for the quantification of small molecules.
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Journal of Saudi Chemical Society
·
2021
·
IF 3.932
Tao Chen,Yuan Zhao,Ya-nan Sang,Min Tang,Guo-wen Hu,Xiao-bing Han,Jie Gao,Rui Ma
Efficient adsorption and separation of organic dyes in the wastewater is highly desirable for environmental protection. A facile synthesis of magnetic bio-based chitosan (CS) microspheres grafted with sodium polystyrene sulfonate (SPSS) via electron beam radiation is described. The obtained microspheres were characterized by FTIR, SEM, TG and VSM, which demonstrated millimetric magnetic CS-g-SPSS microspheres were obtained with enhanced thermal stability. Experimental parameters such as absorbed dosage, mass ratio, initial pH, initial concentration and contact time for the adsorption were thoroughly investigated. To investigate the adsorption rate and recyclability, evaluation of adsorption kinetic model and adsorption/desorption experiment were conducted.
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DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Bo Lv,Xuefan Feng,Xiaoping Wu,Xiaoming Wang,Xiong Zou,Huazhong Wang,Fuqin Zhang
Herein, a novel composite photocatalyst was prepared by the vapor deposition of g-C 3 N 4 on TiO 2 nanosquare, dominated with {001} facets. The deposition method is robust, convenient, and effective. The surface topography and structure of the composites were analyzed by XRD , XPS, SEM, and TEM . The mechanism for enhanced photocatalysis was studied using PL, PC, UV–vis-NIR-DRS, TRPL, EIS and EPR. The photocatalytic activities of the fabricated composites were evaluated by the degradation of methylene blue (MB) and hexavalent chromium ions (Cr 6+ ) under visible light irradiation. The photodegradation of MB and Cr 6+ was completed in 50 and 40 min, respectively. Based on a pseudo-first-order kinetic model (ln(C 0 /C) = kt), the measured the degradation rate constant for MB using gCN/TO5 was 4.6 and 35.9 times higher than that of pure g-C 3 N 4 and TiO 2 , respectively. Similar results were found for the Cr 6+ degradation. The outstanding photocatalytic performance of the g-C 3 N 4 on TiO 2 composite was ascribed to the presence of the TiO 2 /g-C 3 N 4 heterojunctions , which effectively improved the separation of the photoexcited electrons and holes hence the enhancement of visible-light photoactivity . Overall, this work showed a convenient and efficient method for fabricating the visible light photocatalysts with established possible mechanisms for the photoactivity of the hybrid photocatalytic composite material.
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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
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