RESEARCH ON CHEMICAL INTERMEDIATES
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2023
·Vol. 49
·期 7
·2793-2806
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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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Acta Metallurgica Sinica-English Letters
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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
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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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JOURNAL OF SOILS AND SEDIMENTS
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2023
·Vol. 23
·期 8
·3006-3017
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IF 3.6
Dong Yibo,Liu Xudong,Wu Xiaomao
Purpose In this study, the adsorption behavior of diuron in a typical black soil and its bioavailability to crops and earthworms were investigated by adsorption and incubation experiments, combined with biochar amendment and aging time. Methods In this study, the adsorption of diuron, and its uptake by corn and earthworms were investigated in black soil with 0.1–5% (w/w) bamboo charcoal. Results Uptake of diuron by corns was reduced by 45% in black soil aged for 0 day in 0.1–5% biochar-amended soil, the concentration of diuron in both roots and stems of corn plants tended to decrease with the increase of aging time, and the enrichment coefficient of diuron in corn also tended to decrease in 0.1–5% biochar-amended soil. When aging time was 0 day and the biochar amendment in black soil was 0.1–5%, the accumulation concentration of diuron in earthworms decreased by 63%; the bioconcentration coefficient of diuron in earthworms in black soil with different levels of biochar decreased continuously with the increase of aging time. Conclusion Biochar is an efficient adsorbent for diuron and could significantly reduce the uptake of diuron by plants and earthworms from contaminated soil. Significant correlations indicated that regression analyses could be constructed between the bioconcentration factor and sorption coefficients to predict the bioavailability of diuron residues in soil to corns and earthworms. Biochar amendment could be used as an option to immobilize diuron in soil and protect non-target organisms from diuron contamination.
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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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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 12
·1-20
·
IF 2.8
Aghazadeh Mustafa,Foratirad Hamzeh
In this paper, porous graphene (PG)/functionalized multiwalled carbon nanotubes (f-MWNTs) composite was first synthesized through a catalytic chemical vapor deposition (CCVD) followed by hydrothermal procedure. The prepared f-MWNTs/PG composite was then embedded into Ni foam (NF) via direct electrophoretic deposition, and Ni(OH) 2 nanoplates were simultaneously deposited on the surfaces of both porous graphene and f-MWNTs through a simple electrochemical deposition. The obtained Ni(OH) 2 @f-MWNTs-PG deposit was characterized through XRD, FT-IR, Raman, DSC-TGA, BET, FE-SEM, and TEM techniques. These analyses results verified that β-Ni(OH) 2 nanoplates uniformly anchored onto both components of the electrodeposited composite. The charge storage ability of the fabricated Ni(OH) 2 @f-MWNTs-NPG/NF was tested as a binder-free supercapacitor electrode through cyclic voltammetry, continuous charge–discharge cycling, and AC impedance techniques, and compared with pristine Ni(OH) 2 /Ni foam electrode. The specific capacities as high as 374.5 mAh g − 1 and 277 mAh g − 1 at the current loads of 0.5 and 10 A g –1 were respectively achieved for the prepared composite/NF electrode. Also, the cycling abilities of 94.8% and 77.8% were obtained after 5000 continuous charge–discharge cycles at 2 and 6 A g –1 , respectively. The outstanding capacitive capability of the fabricated composite electrode was assigned to the synergetic contributions between the Ni(OH) 2 nanoplates and porous graphene/functionalized MWNTs and their rational architecture in the composite matrix.
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Nano-Micro Letters
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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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Nature Protocols
·
2023
·Vol. 18
·期 7
·2032-2050
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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
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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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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 21
·8952-8968
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IF 4.5
Qi Wenxia,Wang Shenglan,Yang Heng,Luo Tingting,Zhao Feng,Han Jingtian,Zhang Jing
Combination chemotherapy is a crucial therapeutic strategy to improve the therapeutic efficacy of breast cancer in clinic. When combined with photodynamic therapy (PDT), the therapeutic efficacy can be further enhanced not only by PDT-induced phototoxicity, but also by PDT-induced photochemical internalization which facilitates the intracellular delivery and endo/lysosomes escape of drugs, therefore exhibit considerable potential in clinical treatment of breast cancer. Herein, a novel cocktail therapeutic strategy based on albumin-based nanosystem was established by covalently modifying human serum albumin (HSA) with all-trans retinoic acid (RA) and chlorin e6 (Ce6) to form HSA-RA-Ce6 (HRC) conjugate, and using paclitaxel (PTX) to induce self-assembly of HRC to form HRC@PTX nanoparticles (HRC@PTX NPs). The HRC@PTX NPs could amplify the therapeutic efficacy of combination chemotherapy of RA and PTX with Ce6-mediated PDT. The HRC@PTX NPs were characterized with a mean particle size of 174.1 ± 2.1 nm and a slightly negative zeta potential and exhibited good stability and hemocompatibility. The HRC@PTX NPs could promote the cellular uptake of drugs by MCF-7 cells and MDA-MB-231 cells and produce ROS to amplify the synergistic anti-tumor efficacy. The in vitro inhibitory effects on tumor growth investigated on monolayer and three-dimensional tumor spheroids revealed that HRC@PTX NPs exhibited significantly higher anti-tumor activity when exposed to 660-nm laser. These results demonstrated that HRC@PTX NPs could be developed as a promising cocktail therapeutic strategy for synergistic breast cancer therapy. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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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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BIOTECHNOLOGY LETTERS
·
2023
·Vol. 45
·期 8
·993-1000
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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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