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Reactive Extraction of L-valine with Di(2-ethylhexyl) Phosphate Acid

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Reactive Extraction of L-valine with Di(2-ethylhexyl) Phosph...

Extractive Separation of 4-Hydroxylpyridine with Co-extractant of Di(2-ethylhexyl) Phosphoric Acid and Tri-n-butyl-Phosphate

河南省化学会2016年学术年会

作者： Huihua Bai Linzhou Li zhixiang chang Deliang Li Institute of Environmental and Analytical Sciences College of Chemistry and Chemical EngineeringHenan University

Amino acids, the main components of proteins and enzymes, has been significantly increased for its extensive use, and series of encouraging results have been obtained with the establishment of the reactive extraction of amino acids. Although several researchers have studied the extraction of amino acids from the aqueous solution, few works on separating L-valine by this technique have been *** reactive extraction of L-valine with di(2-ethylhexyl) phosphate acid(D2EHPA) has been studied detailedly in this paper. The key factors that affect the extraction equilibrium distribution, including the types of extraction diluents, p H value, the concentrations of L-valine and extracting agents have been discussed. The expression of equilibrium distribution ratio is also proposed. Through investigating the extraction kinetics in the temperature range between 5-40 °C for 0.5-2.5 h, Conclusions can be drawn that D2 EHPA is the best extractant at 25 °C with the extraction time of 1.5 h, which are selected as optimized conditions. Moreover, the distribution of extraction equilibrium rose to the highest value when D2 EHPA combined with 1-octanol at p Heq around 2.6. Meanwhile, the extraction mechanism is also analyzed by the Fourier infrared spectrum. It is found that the reactive extraction of L-valine by D2 EHPA is mainly driven by the ion-exchange with forming the(1:1) complex. The established of model confirms the reliability of the experimental data. Good experimental results have been got by investigating the conditions of extraction L-valine with di(2-ethylhexyl) phosphate acid. Moreover,these results could provide preliminary experimental data and theoretical basis for the separation from aqueous solutions, as well as the recovery from effluents.

关键词： L-valine reactive extraction di(2-ethylhexyl) phosphate acid

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Extractive Separation of 4-Hydroxylpyridine with Co-extracta...

河南省化学会2016年学术年会

作者： Huihua Bai Can Dai zhixiang chang Deliang Li Institute of Environmental and Analytical Sciences College of Chemistry and Chemical EngineeringHenan University

In our previous work, reactive extraction using di(2-ethylhexyl) phosphate acid(D2EHPA) has been successfully used for the separation of 4-Hydroxylpyridine(4HP) from the aqueous solution. This study investigates the separation of 4HP by synergistic extraction. Several factors including the extraction agents,p H value,the concentrations of co-extractant and 4HP, which influence the co-extraction of 4HP are also studied. The obtained results suggest that the co-extractant of D2 EHPA and tri-n-butyl-phosphate(TBP) could more effectively be used to extract 4HP. Optimum conditions of synergistic extraction are obtained as follows: the molar ratio of D2 EHPA to TBP(Rs) is 2:1, the aqueous equilibrium p H is found to be one of the key factors that sharply affect the distribution ratio(D)values and the best p H is 4-4.8. Moreover, the extraction mechanism is analyzed by the Fourier infrared spectrum, and it is found that the reactive extraction of 4HP by D2EHPA+TBP is mainly driven by two mechanisms: the ionic association synthetic salt and hydrogen bond association.

关键词： 4-Hydroxylpyridine Co-extractant Di(2-ethylhexyl) phosphoric acid Tri-n-butyl-Phosphate

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类单晶硅与铸锭多晶硅的晶体质量差异性研究

太阳能学报 2016年第7期37卷 1744-1747页

作者：张驰常志祥徐飞南京大全新能源有限公司南京210000

以类单晶硅和铸锭多晶硅为研究对象,综合分析其红外(IR)图、光致发光(PL)图、间隙铁(Fei)浓度、少子寿命及电学性能特征。结果表明:相对于铸锭多晶硅,类单晶硅的晶粒尺寸大,晶界和位错少,间隙铁浓度低,少子寿命和电池效率高,晶体质量优... 详细信息

以类单晶硅和铸锭多晶硅为研究对象,综合分析其红外(IR)图、光致发光(PL)图、间隙铁(Fei)浓度、少子寿命及电学性能特征。结果表明:相对于铸锭多晶硅,类单晶硅的晶粒尺寸大,晶界和位错少,间隙铁浓度低,少子寿命和电池效率高,晶体质量优于铸锭多晶硅。

关键词：晶界位错少子寿命电池效率

过渡金属改性的MCM-41中孔沸石的制备及性能

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石油炼制与化工 2000年第1期31卷 24-28页

作者：童广明常志向刘东香抚顺石油化工研究院辽宁抚顺113001

合成了Ｆｅ、Ｎｉ、Ｚｒ等过渡金属改性的ＭＣＭ－４１型中孔沸石，用红外光谱、Ｘ射线衍射及电子能谱进行研究，结果表明Ｆｅ、Ｎｉ、Ｚｒ等原子均已进入分子筛骨架。透射电镜分析结果显示出三种分子筛中分别有六角排列和四方排列的... 详细信息

合成了Ｆｅ、Ｎｉ、Ｚｒ等过渡金属改性的ＭＣＭ－４１型中孔沸石，用红外光谱、Ｘ射线衍射及电子能谱进行研究，结果表明Ｆｅ、Ｎｉ、Ｚｒ等原子均已进入分子筛骨架。透射电镜分析结果显示出三种分子筛中分别有六角排列和四方排列的均一孔道。同时，对改性沸石的反应性能和酸性进行了初步研究。

关键词：分子筛制备过渡金属改性沸石催化剂

柔模充填联合聚能预裂切顶卸压深井沿空留巷围岩控制技术研究

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煤炭技术 2022年第2期41卷 81-86页

作者：常志祥卢志杰张凯河南神火煤电股份有限公司河南永城476600 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116

新庄煤矿采用水泥砂浆柔模充填技术沿空留巷,但充填体切顶效果不理想,仍存在巷道变形严重、留巷返修次数多的问题,为解决沿空留巷围岩控制问题,采用了"柔模充填+聚能爆破预裂"技术。通过分析工作面端部覆岩结构特征以及工作面岩层层序... 详细信息

新庄煤矿采用水泥砂浆柔模充填技术沿空留巷,但充填体切顶效果不理想,仍存在巷道变形严重、留巷返修次数多的问题,为解决沿空留巷围岩控制问题,采用了"柔模充填+聚能爆破预裂"技术。通过分析工作面端部覆岩结构特征以及工作面岩层层序赋存情况,确定了聚能爆破预裂切顶的关键参数。研究结果表明:采取合理的顶板预裂爆破切顶技术,可有效减小悬顶面积,原"砌体梁结构"切顶后形成"短壁悬臂梁"结构,有效减小巷道围岩的承载,巷道顶底板移近量由原来的1150 mm降低为450 mm,巷道返修1次即能满足使用要求。

关键词：沿空留巷柔模聚能预裂围岩控制

煤矿岩巷掘进聚能水压光面爆破新技术研究与应用

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能源与环保 2017年第8期39卷 130-134页

作者：谢文强常志祥王修辉河南神火煤业公司新庄煤矿河南永城476600

我国爆破理论的研究、控制爆破技术的应用和爆破器材的研制有了很大发展。光面爆破技术与普通爆破相比具有显著的优越性,已有很多学者在提高岩巷爆破效果方面做了大量工作,但煤矿井巷岩石爆破作业的状况并未有多大改观,周边眼间距需严... 详细信息

我国爆破理论的研究、控制爆破技术的应用和爆破器材的研制有了很大发展。光面爆破技术与普通爆破相比具有显著的优越性,已有很多学者在提高岩巷爆破效果方面做了大量工作,但煤矿井巷岩石爆破作业的状况并未有多大改观,周边眼间距需严格控制300~400 mm,周边围岩超、欠挖仍较严重,特别是在较软弱破碎岩石中,问题尤为突出。且存在着单位耗药量大、爆破震动和空气冲击波强度大、围岩超挖和损伤大等一系列问题。为了保证光爆效果,提高巷道施工单进水平,对隧道通用组合式聚能装药装置进行了研究,根据实际地质条件,经过井下现场反复试验、摸索、修正、分析总结,对炮眼布置、炮眼角度以及装药结构、装药量进行重新设计及优化,实现了煤矿岩巷大断面施工炮眼间距提高1倍,循环时间减少1.5~2.0 h,循环进尺提高0.3 m以上,提高了光面爆破质量,减小了巷道围岩扰动,施工效率提高10%以上。

关键词：聚能水压光面爆破煤矿岩巷掘进聚能管

Efficient and simple synthesis of B_(2)O_(3)-Al_(2)O_(3)nanocomposites assisted by deep eutectic solvent for production of 5-hydroxymethylfurfural from glucose

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Nano Research 2025年第1期18卷 236-248页

作者： Yuchen Wang Kai Rong Shanlei chang Youxing Fang Shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China College of Chemistry Jilin UniversityChangchun 130012China

The catalytic conversion of glucose to high valueadded platform chemical 5-hydroxymethylfurfural(HMF)is a promising biorefinery process,and alumina-boria catalysts are considered to be green and mild solid acid catalysts for this catalytic ***,compared to the common synthesis methods with complicated steps,we reported a simple and efficient strategy to prepare B_(2)O_(3)-Al_(2)O_(3)nanocomposites by calcining cost-effective glucose-urea deep eutectic solvent(DES)solution containing the *** prepared B_(2)O_(3)-Al_(2)O_(3)nanocomposites exhibited an open three-dimensional skeleton and two-dimensional porous lamellar substructure,endowing them with a high specific surface area(228.27 m2/g).The introduction of boron changed the ratios of different aluminum species(AlⅣ,AlⅤ,and AlⅥ)and borate species(BO3 and BO4),thus further affecting the acidity and the types of acid sites of the *** prepared B_(2)O_(3)-Al_(2)O_(3)bifunctional acid catalysts possessing abundant Lewis acid sites and adjustable Brønsted acid sites showed complete glucose conversion and 55.38%of HMF yield under the optimum *** study proposed a concise method to synthesize alumina-boria solid acid catalysts assisted by glucose-urea *** hope to extend the application and prospect of this efficient and simple synthesis strategy.

关键词： 5-hydroxymethylfurfural(HMF) deep eutectic solvent glucose alumina-boria acid catalyst

Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi Yu Faith Teo En Ning chang Liu Yu-Chi Liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina

Semitransparent Flexible Organic Solar Cells

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Chemical Research in Chinese Universities 2020年第3期36卷 343-350页

作者： WANG Yuhcng chang Yilin ZHANG Jianqi LU Guanghao WEI zhixiang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190P.R.China Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an 710054P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

The semitransparent flexible organic solar cell takes advantages of flexibility,transparency,color adjust ment property,which is more conducive to integrate on buidings and mobile *** to the developments of narrow band gap donors and the new non-fullerene acceptors,the power conversion efficiency of semitransparent flexible organic solar cells has been achieved 10% to 12% with average visible transmittance of 17% to 21%.This review summarizes the molecular design of the most representative layer materials,and discusses the characterization of semitransparent parameters paradigms,then we discuss how to optimize the device in combination with optical simulation,and finally list the recent development of semitransparent flexible electrodes of ITO-free organic solar cells,and give our perspectives on the next step direction.

关键词： Semitransparent Flexible Organic solar cell Electrode Optical simulation