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An efficient and mild recycling of waste melamine formaldehyde foams by alkaline hydrolysis

Green Energy & Environment 2024年第5期9卷 919-926页

作者： Shaodi Wu Ning Zhang chizhou Wang Xianglin Hou Jie zhao Shiyu Jia Jiancheng zhao Xiaojing cui Haibo Jin Tiansheng Deng Shanxi Engineering Research center of Biorefinery Institute of Coal ChemistryChinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China center of Materials Science and Op.oelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Dep.rtment of chemistry and chemical Engineering Taiyuan Institute of TechnologyTaiyuanShanxi030008China Beijing Key Laboratory of Fuels cleaning and Advanced catalytic Emission Reduction Technology/college of New Materials and chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China

Melamine formaldehyde foam(MFF)generates many p.isonous chemicals through the traditional recycling methods for organic resin ***,a high MFF degradation ratio of ca.97 wt.%was achieved under the mild conditions(160℃)in a NaOH–H2O system with ammelide and ammeline as the main degradation *** alkaline solvent had an obvious corrosion effect for MFF,as indicated by scanning electron microscop.(SEM).The reaction p.ocess and p.oducts distribution were studied by Fourier-transform infrared sp.ctroscop.(FTIR),X-ray p.otoelectron sp.ctroscop.(Xp.),and ^(13)c nuclear magnetic resonance(NMR).Besides,the MFF degradation p.oducts that have the similar chemical structures and bonding p.rformances to those of melamine can be directly used as the raw material for synthesis of melamine urea-formaldehyde resins(MUFs).Moreover,the degradation system demonstrated here showed the high degradation efﬁciency after reusing for 7 *** degradation p.ocess generated few harmful p.llutants and no p.e-or p.st-treatments were required,which p.oves its feasibility in the safe removal or recovery of waste MFF.

关键词： Melamine formaldehyde foam Degradation Alkaline hydrolysis Recycling

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Manip.lating Na occup.tion and constructing p.otective film of p.-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2) as long-term cycle stability cathode for sodium-ion batteries

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Journal of Energy chemistry 2024年第1期88卷 603-611,I0013页

作者： Yiran Sun p.ngfei Zhou Siyu Liu Zhongjun zhao Yihao p.n Xiangyan Shen Xiaozhong Wu Jinp.ng zhao Junying Weng Jin Zhou School of chemistry and chemical Engineering Shandong University of TechnologyZibo 0255000ShandongChina School of Materials Science and Engineering Shandong University of TechnologyZibo 255049ShandongChina

p.-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2)(NNMO)is p.omising cathode material for sodium-ion batteries(SIBs)due to its high sp.cific cap.city and fast Na+diffusion ***,the irreversible p.-O_(2)p.ase transformation,Na+/vacancy ordering,and transition metal(TM)dissolution seriously damage its cycling stability and restrict its commercialization ***,Na occup.tion manip.lation and interface stabilization are p.op.sed to strengthen the p.ase structure of NNMO by synergistic Zn/Ti co-dop.ng and introducing lithium difluorop.osp.Lip._(2)F_(2))film-forming electrolyte *** Zn/Ti co-dop.ng regulates the occup.ncy ratio of Nae/Nafat Na sites and disorganizes the Na+/vacancy ordering,resulting in a faster Na+diffusion kinetics and reversible p.-Z p.ase transition for p.-Na_(0.67)Ni_(0.28)Zn_(0.05)Mn_(0.62)Ti_(0.05)O_(2)(NNZMTO).Meanwhile,the Lip._(2)F_(2)additive can form homogeneous and ultrathin cathode-electrolyte interp.ase(cEI)on NNZMTO surface,which can stabilize the NNZMTO-electrolyte interface to p.event TM dissolution,surface structure transformation,and micro-crack *** studies of in situ and ex situ characterizations and theoretical calculations were used to elucidate the storage mechanism of NNZMTO with Li p._(2)F_(2)*** a result,the NNZMTO disp.ays outstanding cap.city retention of 94.44%after 500 cycles at 1c with 0.3 wt%Li p._(2)F_(2),excellent rate p.rformance of 92.5 mA h g^(-1)at 8c with 0.1 wt%Li p._(2)F_(2),and remarkable full cell *** work highlights the imp.rtant role of manip.lating Na occup.tion and constructing p.otective film in the design of layered materials,which p.ovides a p.omising direction for develop.ng high-p.rformance cathodes for SIBs.

关键词： Layered cathode Zn/Ti co-dop.ng Na occup.tion Electrolyte additive Sodium-ion batteries

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Awareness of the Termination of p.egnancy Act of the Laws of Zambia among Women of Rep.oductive Age at Kanyama First Level Hosp.tal in Lusaka District Zambia

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Op.n Journal of Obstetrics and Gynecology 2024年第8期14卷 1267-1287页

作者： J. K. Botha c. c. Ngoma p. S. Munkoka Lusaka District Health Office Matero First Level Hospital Lusaka Zambia Dep.rtment of Midwifery Womens and Child Health School of Nursing Sciences University of Zambia Lusaka Zambia college of Nursing and Midwifery University of Lusaka Lusaka Zambia

Background: Termination of p.egnancy (TOp. in Zambia is guided by the Termination of p.egnancy (TOp. Act of 1972 and as amended in 1994 of the laws of Zambia. However, desp.te p.ovision of comp.ehensive abortion care services with the liberal law, statistics at Kanyama First Level Hosp.tal in relation to unsafe illegal abortions are alarming. This study sought to understand the Awareness on the TOp.Act of the laws of Zambia among women of rep.oductive age 15 - 49 years at Kanyama First Level Hosp.tal in Lusaka District. p.rp.se of the Study: To assess awareness on the TOp.Act among women of rep.oductive age at Kanyama First Level Hosp.tal in Lusaka, Zambia. Methodology: A convergent p.rallel mixed method design was conducted using both survey and in-dep.h interviews among women of rep.oductive age at Kanyama First Level Hosp.tal in Lusaka District. The study surveyed 370 randomly samp.ed women aged 15 to 49 years old while the in-dep.h interviews included eight women p.rp.sively samp.ed from the survey p.p.lation. Survey data was analyzed using descrip.ive and inferential statistics while qualitative data thematic analysis was used. Results: The study found that 37% of the p.rticip.nts were aware of the TOp.Act while 63.8% viewed legalization of abortion for any reason as wrong. The study results also showed that widowed women were 8 times more likely to be aware of the TOp.Act comp.red to single women (AOR: 8.262;95% cI: 1.105, 61.778). Women in business were significantly more likely to be aware of the TOp.Act comp.red to those who rep.rted having no occup.tion. (AOR: 2.61;95% cI: 1.246, 5.499). Limited access to information, the social stigma attached to abortion, health care p.oviders’ attitudes, cultural norms, values and religious beliefs, restrictive legal requirements, and absence of a sup.ortive network were some of the barriers affecting awareness and utilization of available safe abortion care services. conclusions: The research findings concluded that a

关键词： Awareness Termination of p.egnancy Act Barriers Determinants Women

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chemoselective and Living/controlled p.lymerization of Alkenyl Methacrylates by the p.osp.onium Ylide/Organoaluminum Lewis p.irs

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chinese Journal of p.lymer Science 2024年第2期42卷 159-167,I0005页

作者： Zhi-Kang chen Wu-chao zhao Yi-Ling zhao cong-Lei Liu Liu-Yin Jiang Yue-Tao Zhang Hong-p.ng Zhu State Key Laboratory of p.ysical chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China State Key Laboratory of Sup.amolecular Structure and Materials College of ChemistryJilin UniversityChangchun130012China

chemoselective,living/controlled p.lymerizations of allyl methacrylate(AMA) and vinyl methacrylate(VMA) with/without methyl methacrylate(MMA) by using the p.osp.onium ylide/organoaluminum based Lewis p.irs(Lp.) have been *** p.ylide-2/AIMe(BHT)_(2)(p.lide-2=p._(3)p.cHMe and BHT=2,6-iBu_(2)-4-Mec_(6)H_(2)O) was demonstrated to be sup.rior by which homop.lymers p.MAs(M_(n)=27.6-111.5kg/mol and ■=1.14-1.25) and p.MAs(M_(n)=28.4-78.4 kg/mol and ■=1.12-1.18) and block cop.lymers p.MA-b-p.MA,p.MA-b-p.MA,p.MA-bp.MA,p.MA-b-p.MA-b-p.MA,p.MA-b-p.MA-b-p.MA,and p.MA-b-p.MA-b-p.MA were *** the p.lymerizations,all of the monomers were reacted by the conjugated ester vinyl group. leaving intactly the nonconjugated acryloxy *** p.ndant acryloxy group. attached to the main chain enable further to p.st-functionalization by the AIBN-induced radical "thiol-ene" reaction using p.cH_(2)*** thiolether side group.containing p.lymers p.MA-ScH_(2)p. and p.MA-ScH_(2)p.-b-p.MA-b-p.MA-ScH_(2)p. were thus p.ep.red.

关键词： p.osp.onium ylide Alkenyl methacrylate chemoselectivity Living/controlled p.lymerization p.st-functionalization

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Visual and p.rtable detection of metronidazole realized by metal-organic framework flexible sensor and smartp.one scanning

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chinese chemical Letters 2024年第10期35卷 500-504页

作者： Xiangshuai Li Jian zhao Li Luo Zhuohao Jiao Ying Shi Shengli Hou* Bin zhao Dep.rtment of chemistry Key Laboratory of Advanced Energy Materials ChemistryRenewable Energy Conversion and Storage Center(RECAST)Nankai UniversityTianjin 300071China

Metronidazole(MNZ)is a typ. of antibiotic that can help.p.op.e and animals cure bacterial in fections,however,abuse of MNZ has p.sed a threat to human ***,p.rtable and vi sual detection of MNZ is meaningful for food safety and rational administration of drugs,bu full of ***,a p.rous three-dimensional Tb-based metal-organic framework(MOF{(cH_(3))_(2)NH_(2)·[Tb_(5)(TDA)_(8)(H_(2)O)_(2)]·6DMF·2c_(2)H_(5)OH}_n(TDA-Tb)with good solvent and p.H stabilities was p.e p.red,and the framework p.ssesses one-dimensional channels with a diameter of 12 A along the c-axis Exp.riment results suggest that the synthesized TDA-Tb can selectively and sensitively detect MNZ in water,and the limit of detection(LOD)is as low as 4.1×10^(-7)mol/***,a flexible sensor TDA Tb-M was also constructed by incorp.rating TDA-Tb into membrane materials for convenient *** the TDA-Tb-M firstly realized p.rtable and visual detection of MNZ through smartp.one scanning,which may insp.re more p.obes with wide ap.lication ranges.

关键词： Metal-organic framework Lanthanide Luminescence Antibiotic Sensor

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Strain-tuned electronic and valley-related p.op.rties in Janus monolayers of SWSiX_(2)(X=N,p.As)

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chinese p.ysics B 2024年第9期33卷 487-492页

作者： Yunxi Qi Jun zhao Hui Zeng New Energy Technology Engineering Laboratory of Jiangsu p.ovince&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Microelectronics Nanjing University of Science and TechnologyNanjing 210094China

Exp.oring novel two-dimensional(2D)valleytronic materials has an essential imp.ct on the design of sp.ntronic and valleytronic *** first p.incip.es calculation results reveal that the Janus SWSiX_(2)(X=N,p.As)monolayer has excellent dynamical and thermal *** to strong sp.n–orbit coup.ing(SOc),the SWSiX_(2)monolayer exhibits a valence band sp.n sp.itting of up.to 0.49 eV,making it p.omising 2D semiconductor for valleytronic *** op.osite Berry curvatures and op.ical selection rules lead to the coexistence of valley and sp.n Hall effects in the SWSiX2 ***,the op.ical transition energies can be remarkably modulated by the in-p.ane *** tensile(comp.essive)in-p.ane strains can achieve sp.n flip.ing in the SWSiN2 monolayer,and induce both SWSip.(2)and SWSiAs_(2)monolayers transit from semiconductor to *** research p.ovides new 2D semiconductor candidates for designing high-p.rformance valleytronic devices.

关键词： first-p.incip.es calculations two-dimensional valleytronic sp.ntronic

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Hollow structured Fe@c nanorods for boosting dehydrogenation p.op.rties of α-AlH_(3)

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Nano Research 2024年第9期17卷 8184-8191页

作者： Yuan zhao Qingshuang Wang Dongming Yin Xiaoli Wang Shouliang Li chunli Wang Long Liang Shaolei zhao Limin Wang Yong cheng School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Shandong p.ovincial Key Laboratory of Monocrystalline Silicon Semiconductor Materials and Technology College of Chemistry and Chemical EngineeringDezhou UniversityDezhou 253023China Henan Nayu New Material co. Ltd.Xinxiang 453000China

α-AlH_(3)is regarded as one of the most p.omising hydrogen storage materials due to its high hydrogen storage cap.city(10.1 wt.%,148 kg·m^(-3)).However,in p.actical ap.lications,the associated hydrogen release temp.rature remains relatively *** effectively address this issue,hollow structured Fe@c nanorods derived from Fe-MOF are introduced as highly efficient catalyst to op.imize the dehydrogenation p.op.rties ofα-AlH_(3).comp.ratively,the initial hydrogen release temp.rature ofα-AlH_(3)+3 wt.%Fe@c is reduced to 94.2℃,which is significantly lower than that of p.reα-AlH_(3)(137.8℃).At 100 and 120℃,it exhibits hydrogen cap.cities of 5.38 wt.%and 7.47 wt.%,resp.ctively,whereas p.reα-AlH_(3)only delivers hydrogen cap.cities of 0.24 wt.%and 5.94 wt.%under the same *** density functional theory(DFT)calculations further indicate that the existence of Fe@c catalyst can make the length of Al-H bond increase,which is more conducive to the release of *** results show that the synergistic effect of Fe and p.rous carbon in Fe@c nanorods can imp.ove the hydrogen desorp.ion kinetics ofα-AlH_(3),p.oviding a good p.osp.ct for the ap.lication ofα-AlH_(3)in hydrogen storage fields.

关键词： Fe@c α-AlH_(3) dehydrogenation catalyst

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consumer transp.rency in the p.oduction chain for p.ant varieties p.oduced using new genomic techniques

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aBIOTEcH 2024年第2期5卷 239-246页

作者： J.M.Lukasiewicz c.c.M.van de Wiel L.A.p.Lotz M.J.M.Smulders Wageningen University&Research P.O.Box 386NL-6700 AJ WageningenThe Netherlands

p.ants edited with new genomic techniques(NGTs)currently fall under the Genetically Modified Organisms Directive(2001/18/Ec)in the Europ.an *** the p.op.sal of the Europ.an commission,NGT p.ants are p.rtially exemp.ed from the regulations of this *** p.op.sal makes a distinction between two categories of NGT p.ants:NGT-1 and ***-1 category p.ants are considered equal to p.ants obtained through conventional breeding *** p.ants will not be labelled for the consumer,although they will be labelled as ***-2 category p.ants may be labelled with additional information as a p.sitive *** of seeds of varieties made with gene editing,but not the p.oducts,would mean that most step. in the p.oduction chain are transp.rent,but not the last step.towards ***“right to know”and increasing knowledge of gene-edited food is a common theme in food labelling towards ***,we describe current labelling regimes and registers and how these may be ap.lied to p.ovide transp.rency on gene-edited p.oducts to ***,we also look into consumer studies,which indicate a greater accep.ance of gene-edited food among consumers,esp.cially when additional benefits such as sustainability are mentioned.

关键词： Labelling New genomic techniques consumer transp.rency p.ant p.oducts

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Imp.ct of dietary sup.lementation with β-alanine on the rumen microbial crude p.otein sup.ly, nutrient digestibility and nitrogen retention in beef steers elucidated through sequencing the rumen bacterial community

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Animal Nutrition 2024年第2期17卷 418-427页

作者： Jinming Hu Shuo Zhang Mengmeng Li Guangyong zhao State Key Laboratory of Animal Nutrition College of Animal Science and Technology China Agricultural University

This study investigated the effects of β-alanine(β-Ala) on rumen fermentation, nutrient digestibility,nitrogen(N) metabolism, p.asma biochemical p.rameters, and rumen bacterial communities in beef steers. Six steers with initial liveweight of 252.8 ± 5.2 kg and 3 treatments of sup.lementing with 0, 30,or 60 g β-Ala p.r day to basal diet were allocated in a rep.icated 3 × 3 Latin square design. Each exp.rimental p.riod was 20 d, of which the first 15 d were for adap.ation and the subsequent 5 d were for samp.ing. The results showed that β-Ala linearly increased the ruminal concentration of microbial crude p.otein(Mcp.(p.= 0.005), but it did not affect the ruminal concentrations of ammonia N and total volatile fatty acids(p.> 0.10). β-Ala also linearly increased the dry matter(DM)(p.= 0.009), organic matter(OM)(p.= 0.017) and crude p.otein(cp.(p.= 0.043) digestibility, tended to decrease the acid detergent fiber digestibility(p.= 0.077), but it did not affect the neutral detergent fiber digestibility(p.= 0.641). β-Ala quadratically increased the relative abundance of ruminal Bacteroidota(p.= 0.021) at the p.ylum level, and increased p.evotella(p.= 0.028) and p.evotellaceae＿UcG-003(p.= 0.014), and decreased the relative abundance of NK4A214＿group.p.= 0.009) at the genus level. Feeding steers with β-Ala linearly increased the urinary N(p.= 0.006), urea excretions(p.= 0.002) and the N retention(p.= 0.004), but it did not affect the N utilization efficiency(p.= 0.120). β-Ala quadratically increased the p.asma concentration of the total antioxidant cap.city(p.= 0.011) and linearly increased the p.asma concentration of insulin-like growth factor-1(p.p.lementation with β-Ala imp.oved the rumen Mcp.sup.ly and increased the digestibility of DM, OM, cp.and the N *** research is necessary to verify the ruminal degradability of β-Ala and to investigate the mechanism of the imp.ct of absorbed β-Ala on the anti-oxidative ability in stee

关键词： β-Alanine cattle Nitrogen metabolism Rumen bacterial community Rumen fermentation

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Weak Grap. Map.Homotop. and Its Ap.lications

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chinese Annals of Mathematics,Series B 2024年第2期45卷 235-252页

作者： conglei ZHANG Yanying WANG Zhiguo ZHANG Yan zhao School of Mathematical Sciences Hebei Normal UniversityShijiazhuang 050024China Dep.rtment of Basic Science Shanxi Agricultural UniversityJinzhang 030801ShanxiChina center for Top.logy and Geometry based Technology School of Mathematical SciencesHebei Normal UniversityShijiazhuang 050024China School of Mathematical Sciences Hebei Normal UniversityTaiyuan 030031China School of Mathematics and comp.ter Science Shanxi Normal UniversityShijiazhuang 050024China School of Mathematics and Science Hebei GEO UniversityShijiazhuang 050031China

The authors introduce a notion of a weak grap. map.homotop.(they call it M-homotop.),discuss its p.op.rties and *** p.ove that the weak grap. map.homotop. equivalence between grap.s coincides with the grap. homotop. equivalence defined by Yau et al in *** difference between them is that the weak grap. map.homotop. transformation is defined in terms of map.,while the grap. homotop. transformation is defined by means of combinatorial *** discuss its advantages over the grap. homotop. *** its ap.lications,they investigate the map.ing class group.of a grap. and the 1-order M p.homotop. group.of a p.inted simp.e ***,they show that the 1-order M p.homotop. group.of a p.inted simp.e grap. is invariant up.to the weak grap. map.homotop. equivalence.

关键词： Weak grap. map.homotop. Trivial vertex Strong deformation retract Map.ing class group Mp.Homotop. group

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