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boric acid-Assisted Pyrolysis for High-Loading Single-Atom Catalysts to Boost Oxygen Reduction Reaction in Zn-Air Batteries

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Energy & Environmental Materials 2024年第2期7卷 102-110页

作者： Chenxi Xu Jiexing Wu Liang Chen Yi Gong Boyang Mao Jincan Zhang Jinhai Deng Mingxuan Mao Yan Shi Zhaohui Hou Mengxue Cao Huanxin Li Haihui Zhou Zhongyuan Huang Yafei Kuang State Key Laboratory for Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China School of Chemistry and Chemical Engineering Key Laboratory of Hunan Province for Advanced Carbon-based Functional MaterialsHunan Institute of Science and TechnologyYueyang 414006China Advanced Technology Institute University of SurreyGuildford Surrey GU27XHUK Department of Engineering University of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK King's College London London SE11ULUK Department of Electrical and Electronic Engineering Imperial College LondonLondon SW72AZUK College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Department of Chemistry Physical&Theoretical Chemistry LaboratoryUniversity of OxfordSouth Parks RoadOxford OX13QZUK

The emerging of single-atom catalysts(SACs)offers a great opportunity for the development of advanced energy storage and conversion devices due to their excellent activity and durability,but the actual mass production of high-loading SACs is still ***,a facile and green boron acid(H_(3)BO_(3))-assisted pyrolysis strategy is put forward to synthesize SACs by only using chitosan,cobalt salt and H_(3)BO_(3)as precursor,and the effect of H_(3)BO_(3)is deeply *** results show that molten boron oxide derived from H_(3)BO_(3)as ideal high-temperature carbonization media and blocking media play important role in the synthesis *** a result,the acquired Co/N/B tri-doped porous carbon framework(Co-N-B-C)not only presents hierarchical porous structure,large specific surface area and abundant carbon edges but also possesses high-loading single Co atom(4.2 wt.%),thus giving rise to outstanding oxygen catalytic *** employed as a catalyst for air cathode in Zn-air batteries,the resultant Co-N-B-C catalyst shows remarkable power density and long-term ***,our work gains deep insight into the role of H_(3)BO_(3)and provides a new avenue to synthesis of high-performance SACs.

关键词： boric acid oxygen reduction reaction single-atom catalysts Zn-air batteries

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boric acid reduces axonal and myelin damage in experimental sciatic nerve injury

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Neural Regeneration Research 2016年第10期11卷 1660-1665页

作者： Zahir Kizilay Haydar Ali Erken Nesibe Kahraman Cetin Serdar Aktas Burcin lrem Abas Ali Yilmaz Department of Neurosurgery Faculty of Medicine Adnan Menderes University Aydin Turkey Department of Physiology Faculty of Medicine Balikesir University BalikesirTurkey Department of Pathology Faculty of Medicine Adnan Menderes University Aydin Turkey Department of Pharmacology and Toxicology Faculty of Medicine Adnan Menderes University Aydin Turkey Department of Clinical Biochemistry Faculty of Medicine Adnan Menderes University AydinTurkey

The aim of this study was to investigate the effects of boric acid in experimental acute sciatic nerve injury. Twenty-eight adult male rats were randomly divided into four equal groups （n = 7）： control （C）, boric acid （BA）, sciatic nerve injury （I） , and sciatic nerve injury ＋ boric acid treatment （BAI）. Sciatic nerve injury was generated using a Yasargil aneurysm clip in the groups I and BAI. boric acid was given four times at 100 mg/kg to rats in the groups BA and BAI after injury （by gavage at 0, 24, 48 and 72 hours） but no injury was made in the group BA. In vivo electrophysiological tests were performed at the end of the day 4 and sciatic nerve tissue samples were taken for histopathological examination. The amplitude of compound action potential, the nerve conduction velocity and the number of axons were significantly lower and the myelin structure was found to be broken in group I compared with those in groups C and BA. However, the amplitude of the compound action potential, the nerve conduction velocity and the number of axons were significantly greater in group BAI than in group I. Moreover, myelin injury was significantly milder and the intensity of nuclear factor kappa B immunostaining was significantly weaker in group BAI than in group I. The results of this study show that administration of boric acid at 100 mg/kg after sciatic nerve injury in rats markedly reduces myelin and axonal injury and improves the electrophysiological function of injured sciatic nerve possibly through alleviating oxidative stress reactions.

关键词： nerve regeneration peripheral nerve injury sciatic nerve boric acid nerve conduction velocity axon myelin electrophysiology neural regeneration

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boric acid as an efficient catalyst for the synthesis of 1,1-diacetate under solvent-free condition

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Chinese Chemical Letters 2009年第12期20卷 1453-1456页

作者： K.F Shelke S.B.Sapkal G.K.Kakade P.V.Shinde B.B.Shingate M.S.Shingare Organic Research Laboratory Department of ChemistryDr.Babasaheb Ambedkar Marathwada University

boric acid （BO3H3） is an inexpensive, efficient and mild catalyst for the synthesis of 1,1-diacetate （acylal） from the various aromatic and heteroaryl aldehydes with acetic anhydride at room temperature under solvent-free condition. The present method does not involve any hazardous organic solvents or catalysts. This method gives notable advantages such as excellent chemoselectivity, mild reaction condition, short reaction times and excellent yield.

关键词： Aromatic and heteroaryl aldehyde boric acid 1,1-Diacetate Solvent-free

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Synergistic solvent extraction of boric acid by trioctylamine and 2-hydroxydodecanoic acid

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Chinese Journal of Chemical Engineering 2024年第10期74卷 117-126页

作者： Zhuojun Jiang Yufeng Liang Shuyao Xiong Guo Li Qian Zhang Benzheng Xia Liangrong Yang Zheng Li CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China Univ.Lille CNRSCentrale Lille InstitutUniv.ArtoisUMR 8181-UCCS-Unitéde Catalyse et Chimie du SolideLille F-59000France MCC Ruimu New Energy Technology Co. LtdTangshan 063200China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100408China

A synergistic solvent extraction system comprising trioctylamine(TOA)and ligands with hydroxyl and carboxyl groups can efficiently recover boric acid(H_(3)BO_(3))and separate boron ***,the structure of ligands might impact H_(3)BO_(3) extraction,boron isotope separation,and solvent loss,which has not been thoroughly *** study initially evaluated the influence of ligand's type,pKa,and substituents on H_(3)BO_(3) extraction efficiency,as well as the impact of the B_((4))-O structure(boron is bound to four oxygen atoms)in the organic phase on isotope separation ***,by synthesizing the highly hydrophobic 2-hydroxydodecanoic acid(HYA),the extraction performance and mechanism of the TOA/HYA system were *** findings highlight the superior extraction efficiency when employing di-phenolic hydroxyl,phenolic hydroxyl + carbinol hydroxyl,and alcoholic hydroxyl + carboxyl ligands compared to phenolic hydroxyl + carboxyl,phenolic hydroxyl + ethanol hydroxyl,diol hydroxyl,and dicarboxylic *** organic phase anion complex,exclusively comprising the B_((4))-O structure,enhances isotope separation *** TOA/HYA system achieves an 80%single-stage extraction efficiency for H_(3)BO_(3).H_(3)BO_(3) and HYA are extracted into the organic phase at a ratio of 1:2,with the anion complex solely containing the B_((4))-O *** study paves the way for the construction of novel boric acid extraction and boron isotope separation systems.

关键词： boric acid 2-Hydroxydodecanoic acid Synergistic extraction Coordination mechanism Boron isotope separation

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Preparation of boric acid from low-grade ascharite and recovery of magnesium sulfate

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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 1161-1165页

作者：李杰樊占国刘艳丽刘素兰姜涛奚正平 School of Materials and Metallurgy Northeastern University Northwest Institute for Nonferrous Metal Research

boric acid and kieserite were prepared from low-grade ascharite by sulfuric acid *** method results in the recovery of 71.06%and 45.03%for boric acid and kieserite,***,the boric acid was precipitated from the filtrate at low temperature and the solution was recycled without discharging waste liquid in the whole *** influence of amount of sulfuric acid,mass fraction of sulfuric acid,reaction temperature and reaction time on the leaching rate of boric acid were studied. The results show that the leaching rate of boric acid reaches 93.80%under the following conditions:the amount of sulfuric acid is 85%of theoretical dosage;the mass fraction of sulfuric acid is 25%;reaction temperature is 95℃;and the reaction time is 100 min. Meanwhile,the effects of mass fraction of magnesium sulfate,crystallization temperature and crystallization time on the crystallization of kieserite were investigated and the optimal crystallization conditions are obtained:the mass fraction of magnesium sulfate is 28%;the crystallization temperature is 180℃and the crystallization time is 4h.

关键词： low-grade ascharite sulfuric acid method high temperature crystallization boric acid kieserite

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Improvement of Selectivity with boric acid in Separating Phenolic acids by Capillary Zone Electrophoresis

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Chinese Chemical Letters 1998年第1期9卷 87-91页

作者： Hong LONG Ai Jin HUANG Yi Liang SUN(Department of Chemistry, Peking University, Beijing 100871) Department of Chemistry Peking University Beijing 100871 China

It was shown that in capillary electrophoresis (CE) the addition of boric acid as a complexing agent in phosphate buffer can modulate the separation selectivity of phenolic acids.

关键词： capillary electrophoresis boric acid separation phenolic acid

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Unusual phosphorescence of boric acid:From impurity or clusterization-triggered emission?

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Aggregate 2024年第2期5卷 423-430页

作者： Peisheng Cao Yanying Wang Haoyue Zheng Peng Wu College of Chemistry Sichuan UniversityChengduChina Analytical&Testing Center State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduChina

The unusual room-temperature phosphorescence(RTP)from the n electron-rich systems(without regular conjugated structure)has aroused great attention for structural designing and application development of RTP *** emission has been ascribed to clusterization-triggered emission(CTE)via weak through-space conjugation of n electrons in the ***,there was suspicion on such RTP as impurity-induced ***,in-depth photophysical investigation and effective proof methods are needed to trace the origin of such ***,using the recently reported CTE phosphor boric acid as the example,a Jablonski diagram-based verification protocol was proposed to confirm the intrinsic luminescence of the n electrons-rich ***,some other types of luminophores,that is,traditional phosphors,already reported impurity-induced and host-guest doping luminophores,were included for ***,this work provides a basic paradigm for differentiating between the impurity-involved and the n electron-rich phosphors and will further deepen the understanding of nonconventional luminescence.

关键词： boric acid clusterization-triggered emission impurity-induced phosphorescence through-space conjugation

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Efficient one-pot synthesis of 14-substituted-14H-dibenzo[a,j]xanthenes using boric acid under solvent-free conditions

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Chinese Chemical Letters 2010年第5期21卷 547-549页

作者： Zahed Karimi-Jaberi Mohsen Keshavarzi Department of Chemistry Islamic Azad University of FiroozabadP.O.Box 74715-117 FiroozabadFarsIran

boric acid efficiently catalysed the one-pot reaction of alkyl or aryl aldehydes with 2-naphthol to afford the corresponding 14- alkyl-or aryl-14H-dibenzo[a,j]xanthenes in good yields under solvent-free conditions.

关键词： boric acid 2-Naphthol Dibenzoxanthenes Solvent-free synthesis

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An efficient synthesis of 1,5-benzodiazepine derivatives catalyzed by boric acid

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Chinese Chemical Letters 2009年第8期20卷 905-908页

作者： Xin Zhou Mei Yue Zhang Shu Tao Gao Jing Jun Ma Chun Wang Chao Liu Hebei Key Laboratory of Bioinorganic Chemistry College of Sciences Agricultural University of Hebei Baoding 071001 China

1,5-Benzodiazepine derivatives have been synthesized by the condensation of o-phenylenediamines and ketones in the presence of boric acid as catalyst under mild conditions. This method is simple, environmentally benign and high yielding. ？2009 Chun Wang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： 1,5-Benzodiazepincs o-Phenylenediamines boric acid Synthesis

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Ultra-strong phosphorescence with 48% quantum yield from grinding treated thermal annealed carbon dots and boric acid composite

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SmartMat 2022年第2期3卷 260-268页

作者： Qijun Li Zhenxiao Zhao Shuai Meng Yuchen Li Yunyang Zhao Bohan Zhang Zikang Tang Jing Tan Songnan Qu Institute for Energy Research Institute of Micro-nano Optoelectronics and Terahertz TechnologySchool of Mechanical EngineeringJiangsu UniversityZhenjiangChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina

Metal-free room-temperature phosphorescence(RTP)materials are of great significance for many applications;however,they usually exhibit low efficiency and weak *** article reports a new strategy for the preparation of a high-efficiency and strong RTP materials from crystalline thermal-annealed carbon dots(CDs)and boric acid(BA)composite(g-t-CD@BA)through grinding-induced amorphous to crystallization *** thermal-annealed CDs and BA composite(t-CD@BA)is prepared following a thermal melting and super-cooling route,where the CDs are fully dispersed in molten BA liquid and uniformly frozen in an amorphous thermal annealed BA matrix after super-cooling to room *** grinding treatment,the fracture and fragmentation caused by grinding promote the transformation of the high-energy amorphous state to the lower energy crystalline *** a result,the CDs are uniformly in situ embedded in the BA crystal *** method affords maximum uniform embedding of the CDs in the BA crystals,decreases nonradiative decay,and promotes intersystem crossing by restraining the free vibration of the CDs,thus producing strong RTP materials with the highest reported phosphorescence quantum yield(48%).Remarkably,RTP from g-t-CD@BA powder is strong enough to illuminate items with a delay time exceeding 9 s.

关键词： boric acid carbon dots crystalline state grinding treatment room-temperature phosphorescence

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