ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75595-75609
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IF 5.8
Jiang Mengyun,Xu Zhongjun,Zhang Tingting,Zhang Xirong,Liu Ying,Liu Peng,Chen Xiaochun
In this work, FeS supported SBA-15 mesoporous silica catalyst (FeS@SBA-15) was synthesized successfully, characterized and first applied to persulfate (PS) activation for the degradation of imidacloprid in wastewater. The as-prepared 3.5-FeS@SBA-15 presented an impressive imidacloprid removal efficiency of 93.1% and reaction stoichiometric efficiency (RSE) of 1.82% after 5 min, ascribed to the synergetic effects of improved FeS dispersion and abundant surface sites by SBA-15. Electron paramagnetic resonance spectra and quenching experiments proved that both SO 4 ·- and ·OH were produced in FeS@SBA-15/PS system, and SO 4 ·- played a dominant role in the degradation process. The S 2- can accelerate the cycling of Fe(III)/Fe(II) during activation and increase the steady-state concentration of Fe(II). More importantly, the constructed heterogeneous system exhibited an efficient and stable catalytic activity over a wide range of pH (3.0-9.0), temperature (283K-313K), inorganic ion (NO 3 - ) and humic acid (1-20 mg/L). Moreover, the density functional theory calculations were conducted to predict the potential reaction sites of imidacloprid. Based on eighteen identified intermediates, four main degradation pathways were proposed: hydroxylation, dechlorination, hydrolysis, and the ring cleavage of the imidazolidine. ECOSAR analysis indicated hydroxylation and dechlorination played a key role in the detoxification of the formed compounds. These findings would provide new insights into the application of FeS@SBA-15 catalyst in wastewater treatment and the removal mechanism of imidacloprid from wastewater.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·2793-2806
·
IF 3.3
Zhang Xinxi,Cao Min,Liu Da,Lei Juying,Zhang Jinlong,Liu Yongdi,Zhou Liang
Advanced oxidation processes based on peroxymonosulfate (PMS) activation are widely used for the removal of antibiotic contaminants. However, the commonly used transition metal catalysts suffer from secondary contamination due to ions leaching during the activation of PMS. Herein, the oxygen and nitrogen co-doped carbon material (Nv-NC-2) with abundant mesopores was obtained by simple high-temperature calcination using covalent organic frameworks (COFs) as precursors and NH 4 Cl as an activator. The Nv-NC-2/PMS system exhibited excellent levofloxacin removal efficiency under a wide pH and complex water environment with anions interference. The C=O in Nv-NC-2 was identified as the main active sites through degradation experiments and XPS. Furthermore, the electron paramagnetic resonance, quenching experiments and probe capture experiments demonstrated 1 O 2 and \({\text{O}}_{2}^{ - }\) were dominant active species. This study enhances the catalytic activity of COFs-derived carbon materials through a simple activation technique, which provides a novel method for surface modification of carbon materials.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Xu Ziye,Zhang Tianyu,Chen Hongyu,Zhu Yuyi,Lv Yuexiao,Zhang Shunji,Chen Jiaye,Chen Haide,Yang Lili,Jiang Weiqin,Ni Shengyu,Lu Fangru,Wang Zhaolun,Yang Hao,Dong Ling,Chen Feng,Zhang Hong,Chen Yu,Liu Jiong,Zhang Dandan,Fan Longjiang,Guo Guoji,Wang Yongcheng
Formalin-fixed paraffin-embedded (FFPE) tissues constitute a vast and valuable patient material bank for clinical history and follow-up data. It is still challenging to achieve single cell/nucleus RNA (sc/snRNA) profile in FFPE tissues. Here, we develop a droplet-based snRNA sequencing technology (snRandom-seq) for FFPE tissues by capturing full-length total RNAs with random primers. snRandom-seq shows a minor doublet rate (0.3%), a much higher RNA coverage, and detects more non-coding RNAs and nascent RNAs, compared with state-of-art high-throughput scRNA-seq technologies. snRandom-seq detects a median of >3000 genes per nucleus and identifies 25 typical cell types. Moreover, we apply snRandom-seq on a clinical FFPE human liver cancer specimen and reveal an interesting subpopulation of nuclei with high proliferative activity. Our method provides a powerful snRNA-seq platform for clinical FFPE specimens and promises enormous applications in biomedical research.
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Acta Metallurgica Sinica-English Letters
·
2023
·
IF 3.5
Xiong Jing-Peng,Zeng Yi-Qi,Liu Jin-Long,Wang Wei-Cheng,Luo Lan,Liu Yong
The interfacial structure plays an important role in the mechanical properties of magnesium matrix composite (MMCs) reinforced with graphene nanosheet (GNS) due to their poor wettability with the Mg matrix. An interface design strategy was proposed to form the semi-coherent interfacial structure with superior bonding strength. The lattice mismatch and interfacial bonding strength between Mg/rare earth oxide/carbon were utilized as key characteristics to evaluate the interfacial structure. Lanthanum oxide (La 2 O 3 ) was selected as the intermediate candidate due to its low lattice mismatch and high interfacial bonding strength. To identify the interfacial structure of Mg/La 2 O 3 /graphene, first-principles calculations were conducted to calculate the ideal work of separation and electronic structure of the interfaces. Results demonstrated the presence of strong ionic and covalent interactions at the interface, which theoretically verified the strong interfacial bonding strength among Mg/La 2 O 3 /graphene interfaces. To experimentally validate the interface strength, MMCs with the interface structure of Mg/La 2 O 3 /GNS were developed. The formation of in-situ La 2 O 3 led to the successful attainment of semi-coherent structures between Mg/La 2 O 3 and La 2 O 3 /GNS, resulting in high strength and good ductility of the composite. Overall, this work proposes a new approach to interface design in MMCs with an enhancement of mechanical properties.
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IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 8
·991-1000
·
IF 3.1
Duan Jinsheng,Liu Zhaogang,Du Guifang,Feng Jiameng,Zhao Jingang,Jia Peijie,Hu Yanhong,Wu Jinxiu
Lanthanum terephthalate (LTP) was synthesized using lanthanum nitrate, p -phthalic acid, and sodium hydroxide as raw materials. The products were characterized by elemental analysis and FTIR. LTP was compounded with other stabilizers for a better effect. The effects of LTP on the thermal stability and discoloration of polyvinyl chloride (PVC) were studied by the Congo red experiment and thermal aging test. The dynamic thermal stability was studied through electrical conductivity and torque rheological tests, and the mechanical properties of the material were tested through the tensile test. Using LTP as the heat stabilizer for PVC, the anti-discoloration performance was poor, but the long-term stability was satisfactory (up to 24 min). LTP was used as the main stabilizer and mixed with calcium stearate, zinc stearate (ZnSt 2 ), and pentaerythritol (PER) to obtain the best compound rare-earth thermal stabilizer. When the compounding scheme was LTP:ZnSt 2 :PER = 3:1:1, the stabilizer exhibited excellent antidiscoloration and long-term static stability (up to 39 min), which ensured excellent dynamic thermal stability, processing, and mechanical properties. The thermal stability mechanism results confirmed that LTP could absorb HCl gas freed by the decay of PVC to generate LaCl 3 , which lessened the catalysis of the HCl gas, thereby inhibiting PVC degradation. Graphical abstract
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Nature Protocols
·
2023
·Vol. 18
·期 7
·2032-2050
·
IF 14.8
Chen Guosheng,Huang Siming,Ma Xiaomin,He Rongwei,Ouyang Gangfeng
Enzymes are outstanding natural catalysts with exquisite 3D structures, initiating countless life-sustaining biotransformations in living systems. The flexible structure of an enzyme, however, is highly susceptible to non-physiological environments, which greatly limits its large-scale industrial applications. Seeking suitable supports to immobilize fragile enzymes is one of the most efficient routes to ameliorate the stability problem. This protocol imparts a new bottom-up strategy for enzyme encapsulation using a hydrogen-bonded organic framework (HOF-101). In short, the surface residues of the enzyme can trigger the nucleation of HOF-101 around its surface through the hydrogen-bonded biointerface. As a result, a series of enzymes with different surface chemistries are able to be encapsulated within a highly crystalline HOF-101 scaffold, which has long-range ordered mesochannels. The details of experimental procedures are described in this protocol, which involve the encapsulating method, characterizations of materials and biocatalytic performance tests. Compared with other immobilization methods, this enzyme-triggering HOF-101 encapsulation is easy to operate and affords higher loading efficiency. The formed HOF-101 scaffold has an unambiguous structure and well-arranged mesochannels, favoring mass transfer and understanding of the biocatalytic process. It takes ~13.5 h for successful synthesis of enzyme-encapsulated HOF-101, 3–4 d for characterizations of materials and ~4 h for the biocatalytic performance tests. In addition, no specific expertise is necessary for the preparation of this biocomposite, although the high-resolution imaging requires a low-electron-dose microscope technology. This protocol can provide a useful methodology to efficiently encapsulate enzymes and design biocatalytic HOF materials.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 11
·2986-2997
·
IF 2.7
Asghar Humaira,Khan Iltaf,Saeed Muhammad,Wu Ping,Khan Aftab
In this research work, g-C 3 N 4 /SmFeO 3 nanosheets Z-scheme based nanocomposites were effectively synthesized by employing PVP as a structure-manipulating agent. The comparative investigations proved that g-C 3 N 4 and SmFeO 3 nanosheets have exceptional performances and photocatalytic activities as compared to SmFeO 3 and g-C 3 N 4 nanoparticles. Based on TEM, HRTEM, XRD, DRS, XPS, PL, FTIR, PEC, BET, and FS spectra it is proved that the coupling of CN nanosheets has effectively enlarged the surface area and enhanced the charge separation of SmFeO 3 nanosheets. Compared to pristine SmFeO 3 nanosheets, the most active 3CN-SFOS nanocomposite showed ~ 3.5 times improvement in catalytic activities for CO 2 reduction and Congo red degradation. Adding more, the scavenger tests confirmed that ⋅O 2− and ⋅OH are the most active species for decontamination of Congo red. Finally, our present innovative work will open a novel gateway for the preparation of g-C 3 N 4 /SmFeO 3 nanosheets based Z-scheme nanocomposites and their applications for CO 2 reduction and environment protection. Graphical abstract TOC Diagram: Schematic representation of the energy bandgaps, photogenerated charge separation, and photocatalytic activities improvement mechanism over g-C 3 N 4 /SmFeO 3 nanosheets Z-scheme based nanocomposites
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-19
·
IF 26.6
Li Luolin,Yu Zheng,Liu Jianfeng,Yang Manyi,Shi Gongpu,Feng Ziqi,Luo Wei,Ma Huiru,Guan Jianguo,Mou Fangzhi
Micro/nanorobots can propel and navigate in many hard-to-reach biological environments, and thus may bring revolutionary changes to biomedical research and applications. However, current MNRs lack the capability to collectively perceive and report physicochemical changes in unknown microenvironments. Here we propose to develop swarming responsive photonic nanorobots that can map local physicochemical conditions on the fly and further guide localized photothermal treatment. The RPNRs consist of a photonic nanochain of periodically-assembled magnetic Fe 3 O 4 nanoparticles encapsulated in a responsive hydrogel shell, and show multiple integrated functions, including energetic magnetically-driven swarming motions, bright stimuli-responsive structural colors, and photothermal conversion. Thus, they can actively navigate in complex environments utilizing their controllable swarming motions, then visualize unknown targets (e.g., tumor lesion) by collectively mapping out local abnormal physicochemical conditions (e.g., pH, temperature, or glucose concentration) via their responsive structural colors, and further guide external light irradiation to initiate localized photothermal treatment. This work facilitates the development of intelligent motile nanosensors and versatile multifunctional nanotheranostics for cancer and inflammatory diseases.
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BIOTECHNOLOGY LETTERS
·
2023
·Vol. 45
·期 8
·993-1000
·
IF 2.7
Peng Shuaiying,Chu Zhongmei,Lu Jianfeng,Li Dongxiao,Wang Yonghong,Yang Shengli,Zhang Yi
The self-sufficient cytochrome P450 BM3 mutant (A74G/F87V/D168H/L188Q) can serve as a biocatalyst for whole-cell catalysis process of indigo. Nevertheless, the bioconversion yield of indigo is generally low under normal cultivation conditions (37 °C, 250 rpm). In this study, a recombinant E. coli BL21(DE3) strain was constructed to co-express the P450 BM3 mutant gene and GroEL/ES genes to investigate whether GroEL/ES can promote the indigo bioconversion yield in E. coli . The results revealed that the GroEL/ES system could significantly increase the indigo bioconversion yield, and the indigo bioconversion yield of the strain co-expressing P450 BM3 mutant and GroEL/ES was about 21-fold that of the strain only expressing the P450 BM3 mutant. In addition, the P450 BM3 enzyme content and in vitro indigo bioconversion yield were determined to explore the underlying mechanism for the improvement of indigo bioconversion yield. The results revealed that GroEL/ES did not increase indigo bioconversion yield by increasing the content of P450 BM3 enzyme and its enzymatic transformation efficiency. Moreover, GroEL/ES could improve the intracellular nicotinamide adenine dinucleotide phosphate (NADPH)/NADP + ratio. Given that NADPH is an important coenzyme in the catalytic process of indigo, the underlying mechanism for the improvement of indigo bioconversion yield is probably related to an increase in the intracellular NADPH/NADP + ratio.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9116-9129
·
IF 4.5
Mei Jing,Qiu Zhian,Gao Teng,Wu Qiang,Liu Kui,Huang Youguo,Zheng Fenghua,Jiang Juantao,Wang Hongqiang,Li Qingyu
Graphite powder as a raw material for the production of graphene by electrochemical exfoliation is superior to bulk graphite in terms of cost-effectiveness and manufacturing process. However, the current technology is still in its infancy and lacks preliminary systematic research. Therefore, there is a blank in the theoretical basis for process optimization and production regulation. Here, the effects of the main process parameters including graphite powder category, electric field driving force, electrolyte type, and corresponding concentration were systematically investigated on the electrochemical exfoliation and graphene quality. Expanded graphite powder with flake structure, regular graphite layer arrangement, and large graphite layer spacing is superior to natural flake graphite powder and artificial graphite powder for the electrochemical exfoliation to produce graphene. Sulfate ion with large ionic radius is best suitable for intercalation and subsequent expansion to obtain a high graphene yield and a low I D / I G in graphene in aqueous solution. For graphite powder as raw material, there exist optimal values for both electrolyte concentration and driving voltage for graphene production. A high graphene yield of 42.5% with low defect density ( I D / I G = 0.14–1.43) and oxygen content of 30.54% can be obtained using Na 2 SO 4 at a concentration of 0.1 M at a voltage of 10 V for 4 h. The process optimization and regulation and corresponding influencing mechanisms of process parameters revealed here will provide guidance for the further development of graphene production by electrochemical exfoliation of graphite powder.
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WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 4
·879-901
·
IF 3.4
Luo Lingcong,Zhang Qianqian,Lan Yuling,Deng Jianping,Lin Yang,Du Guanben,Zhao Weigang
High-performance electrodes of activated carbons (PNOACs) with P, N, and O heteroatoms were prepared through a simple one-step phosphoric acid activation method without the need for any dopants or post-treatment. In the preparation procedure, cork biomass material from Quercus variabilis was used as the precursor, and phosphoric acid was used as both the phosphoric resource and the activation agent. The pore structure, morphology, and physicochemical properties of the as-prepared carbons were investigated. In addition, the electrochemical performances of the PNOACs were evaluated using three-electrode and two-electrode systems (symmetric supercapacitor, AS). The results indicated that cork is promising as a low-cost and environmental-friendly precursor for producing high-performance supercapacitors electrode. Furthermore, galvanostatic charge–discharge analysis revealed a specific capacitance of 206 F g −1 at a current density of 0.5 A g −1 , which can be attributed to the excellent hierarchical pore structure (micro-, meso-, and macropores) and suitable pore size distribution of the PNOACs. The specific surface area and total pore volume as high as 515.80 m 2 g −1 and 0.29 cm 3 g −1 were obtained, respectively. The presence of heteroatoms, namely N (0.81–1.07%), P (0.52–2.06%), and O (15.87–19.18%) content, on the carbon surface resulted in a considerable enhancement in the capacitive performance. Furthermore, a PNOAC sample, prepared at 600 °C with a mass ratio of 1:1, exhibited high long-term cycling stability (84.5%) and an energy density of 15.03 W h kg −1 . Therefore, cork is highly promising as an electrode material for supercapacitors to attain exceptional electrochemical performance, as well as provide a new possibility for the utilization and valorization of high-value cork waste.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-10
·
IF 2.8
Wang Wenjun,Wu Jingxuan,Zou Song,Luo Qingsong,Wang Zhenxing,Wan Yu,Wang Yimu,Feng Changhao
In this study, LaFeO 3 nanotubes were created using the electrostatic spinning method and then calcined at various temperatures. Investigations into the impact of calcined temperatures on the morphological properties of LaFeO 3 nanotubes used a variety of methods. The results show that the surface of LaFeO 3 nanotubes gradually became rougher when the calcination temperature was above 700 °C, which could enhance the gas-sensitive properties of n-butanol. The response of LaFeO 3 nanotubes is 45.3–100 ppm n-butanol at 150 °C, and the low detection limit is 0.3 ppm. In addition, LaFeO 3 nanotubes calcined at 700 °C were found to have excellent selectivity for n-butanol. The mechanism of calcination temperature on the improvement of gas-sensitive properties of LaFeO 3 nanotubes was also proposed.
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