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Removal of rubidium from brine by an integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide

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Chinese Journal of Chemical Engineering 2024年第5期69卷 112-121页

作者： huanxi xu Peihua Lin Pei-Jun Liu Hai-Gang Liu Hui-Bin Guo Chao-Xiang Wu Ming Fang xu Zhang Guan-Ping Jin Anhui Province Engineering Research Center of Flexible and Intelligent Materials School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China Chemical Design and Research Institute Co. LTD of Qinghai ProvinceQinghai Engineering and Technology Research Center of Fine ChemicalXining 810008China

A novel integrated film of sulfonated polysulfone/graphene/potassium copper ferricyanide(KCuFC/SPSG)was used for selectively extracting rubidium ion(Rb^(+))from *** form KCuFC/SPSG,the precursor film of sulfonated polysulfone/graphene(SPSG)was synthesized by phase conversion process,which was alternately immersed in 0.1 mol·L^(-1)CuSO_(4)/K_(4)[Fe(CN)_(6)]by in-situ adsorption coupled co-precipitation *** data such as nuclear magnetic resonance spectrometer,Fourier transform infrared spectroscope,X-ray photoelectron spectroscope,X-ray diffraction,scanning electron microscope,and energy dispersive spectroscopy all verified that abundant KCuFC were uniformly located on the *** resulting KCuFC/SPSG was used in film separation *** the solution was fed into the system,the Rb^(+)could be selectively adsorption by KCuFC/*** the saturation adsorption,0.5 mol·L^(-1)NH_(4)Cl/HCl was fed into the film cell,Rb^(+)could be quickly desorbed by ion-exchange between Rb^(+)and NH_(4)^(+)in the lattice of *** purpose of separating and recovering Rb^(+)from the brine can be achieved after the repeated *** effects of pH,adsorption time,and interferential ions on the adsorption capacity of Rb^(+)were investigated by batch *** adsorption behavior fits the pseudo-second order kinetic process,while KCuFC has a higher adsorption capacity(Langmuir maximum sorption 165.4 mg·g^(-1)).In addition,KCuFC/SPSG shows excellent selectivity for Rb^(+)even in complex brine ***/SPSG could maintain 93.5%extraction efficiency after five adsorption/desorption cycles.

关键词： Rubidium extraction Potassium copper ferricyanide Sulfonated polysulfone Graphene oxide Adsorption

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Recovery of lithium using H_(4)Mn_(3.5)Ti_(1.5)O_(12)/reduced graphene oxide/polyacrylamide composite hydrogel from brine by Ads-ESIX process

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Chinese Journal of Chemical Engineering 2022年第4期35卷 20-28页

作者： Jingsi Cui huanxi xu Yanfeng Ding Jingjing Tian xu Zhang Guanping Jin Anhui Key Lab of Controllable Chemical Reaction&Material Chemical Engineering School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China

Powdery Li^(+)-imprinted manganese oxides adsorbent was widely used to the recovery of Li^(+),but there are some difficulties,such as poor stability in acid solution,inconvenience of operation and *** this work,a useful hydrogel composite based H_(4)Mn_(3.5)Ti_(1.5)O_(12)/reduced graphene oxide/polyacrylamide(HMTO-rGO/PAM)was fabricated by thermal initiation method with promising stable,conductive and selective *** resulting materials were characterized by field emission scanning electron microscope,infrared absorption spectrum,X-ray diffraction,X-ray photoelectron spectroscopy and electrochemical *** recovery of Li^(+)was investigated using HMTO-rGO/PAM from brine by a separated two-stage sorption statically and electrically switched ion exchange desorption *** adsorption capacity of 51.5 mg·g^(-1)could be achieved with an initial Li^(+)concentration of 200 mg·L^(-1)in pH 10,at 45℃ for 12 ***^(+)ions could be quickly desorbed by cyclic voltammetry(CV)in pH 3,0.1 mol·L^(-1)HCl/NH;Cl accompanying the exchange of Li^(+)and H+(NH;)and the transfer of LMTO-rGO/PAM to HMTO-rGO/PAM.

关键词： Lithium recovery Titanium doped lithium ion sieve Hydrogel Adsorption-electrically switched ion exchange(Ads-ESIX)

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聚谷氨酸为骨架的梳状基因载体的合成及生物学性能评价

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高等学校化学学报 2014年第9期35卷 2019-2025页

作者：何宁孙贺春徐欢喜邵张章安徽中医药大学药学院合肥230031

以聚谷氨酸为骨架,用低分子量聚乙烯亚胺胺解聚谷氨酸苄酯,得到聚谷氨酸-g-聚乙烯亚胺,用异佛尔酮二异氰酸酯将聚乙二醇单甲醚偶联到聚谷氨酸-g-聚乙烯亚胺上,合成了梳状聚阳离子基因载体聚谷氨酸-g-(聚乙烯亚胺-b-聚乙二醇).利用核磁... 详细信息

以聚谷氨酸为骨架,用低分子量聚乙烯亚胺胺解聚谷氨酸苄酯,得到聚谷氨酸-g-聚乙烯亚胺,用异佛尔酮二异氰酸酯将聚乙二醇单甲醚偶联到聚谷氨酸-g-聚乙烯亚胺上,合成了梳状聚阳离子基因载体聚谷氨酸-g-(聚乙烯亚胺-b-聚乙二醇).利用核磁共振氢谱、激光粒度分析仪、Zeta电位仪和凝胶电泳对聚阳离子载体及其与质粒脱氧核糖核酸(pDNA)形成的复合物进行了表征.通过噻唑蓝(MTT)细胞毒性测试、绿色荧光蛋白质粒pEGFP-C1及荧光素酶质粒pGL3体外转染实验考察了载体的细胞毒性及基因转染效率.结果表明,当聚乙烯亚胺中N原子和DNA中P原子的摩尔比(N/P)大于5时,载体能很好地包裹DNA,载体与DNA形成的复合物粒径约为130 nm,Zeta电位约为28 mV;通过MTT实验和体外质粒转染实验显示出载体在测量范围内具有极低的细胞毒性和较高的转染效率.

关键词：聚阳离子基因载体聚乙烯亚胺绿色荧光蛋白聚乙二醇聚谷氨酸基因转染效率

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多臂星形聚乙烯亚胺的设计合成及聚合动力学

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高分子材料科学与工程 2014年第7期30卷 35-39页

作者：何宁孙贺春董晓曼徐欢喜安徽中医药大学药学院安徽合肥230031

非病毒基因载体聚乙烯亚胺结构不可控,同时最优结构未知,因此文中采用Core-First的方法,以三氟甲磺酸酯作为引发剂,通过2-乙基-2-恶唑啉阳离子开环聚合合成了二臂、四臂、六臂和八臂星形聚乙烯亚胺。利用核磁共振氢谱、凝胶渗透色谱仪... 详细信息

非病毒基因载体聚乙烯亚胺结构不可控,同时最优结构未知,因此文中采用Core-First的方法,以三氟甲磺酸酯作为引发剂,通过2-乙基-2-恶唑啉阳离子开环聚合合成了二臂、四臂、六臂和八臂星形聚乙烯亚胺。利用核磁共振氢谱、凝胶渗透色谱仪对合成的星形聚合物的结构、相对分子质量及其分布进行了表征,并对2-乙基-2-恶唑啉的开环聚合动力学进行了研究。结果表明,合成得到了结构明确、窄分散的多臂星形聚乙烯亚胺,且该聚合反应符合活性聚合的特征。

关键词：非病毒基因载体聚乙烯亚胺三氟甲磺酸酯聚合动力学 2-乙基-2-恶唑啉

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A droplet‐based electricity generator incorporating Kelvin water dropper with ultrahigh instantaneous power density

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Droplet 2024年第1期3卷 95-102页

作者： Yang Li xuezhi Qin Yawei Feng Yuxin Song Zhiran Yi huanxi Zheng Peiyang Zhou Chenyang Wu Siyan Yang Lili Wang Pingan Zhu Wanghuai xu Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Harvesting renewable water energy in various formats such as raindrops,waves,and evaporation is one of the key strategies for achieving global carbon *** recent decade has witnessed rapid advancement of the droplet‐based electricity generator(DEG)with a continuous leap in the instantaneous output power density from 50W/m2 to several kW/*** this,further pushing the upper limit of the output performance of DEG is still constrained by low surface charge density and long precharging ***,we report a DEG incorporating the Kelvin water dropper(K‐DEG)that can generate an ultrahigh instantaneous power density of 105W/m2 upon one droplet *** this design,the Kelvin water dropper continuously replenishes the high density of surface charges on DEG,while DEG fully releases these surface charges into electric output.K‐DEG with such a high output can directly light five 6‐W commercial lamps and even charge a cellphone by using falling droplets.

关键词： generator ultrahigh power

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可降解非病毒基因载体PEG-b-(PG-g-PEI)的合成与表征

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南方医科大学学报 2013年第11期33卷 1643-1647页

作者：何宁孙贺春徐欢喜董晓曼邵张章安徽中医药大学药学院安徽合肥230031

目的结合重组低分子量PEI和PEG结构修饰两种手段合成出新型可生物降解的非病毒基因载体聚乙二醇-b-(聚谷氨酸-g-聚乙烯亚胺)。方法用相对分子质量600的聚乙烯亚胺氨解嵌段聚合物PEG-b-PBLG,合成非病毒基因载体聚乙二醇-b-(聚谷氨酸-g-... 详细信息

目的结合重组低分子量PEI和PEG结构修饰两种手段合成出新型可生物降解的非病毒基因载体聚乙二醇-b-(聚谷氨酸-g-聚乙烯亚胺)。方法用相对分子质量600的聚乙烯亚胺氨解嵌段聚合物PEG-b-PBLG,合成非病毒基因载体聚乙二醇-b-(聚谷氨酸-g-聚乙烯亚胺);利用核磁共振氢谱、凝胶渗透色谱、激光粒度分析仪、zeta电位仪和凝胶电泳对载体及其与DNA复合物进行了表征,并通过体外细胞实验考察了载体的细胞毒性与转染效率。结果我们成功合成出窄分布的非病毒基因载体聚乙二醇-b-(聚谷氨酸-g-聚乙烯亚胺);凝胶电泳测定结果表明当N/P比大于5时载体能很好地包裹DNA;载体与DNA形成的复合物粒径为120 nm,zeta电位25 mV;通过MTT实验和体外质粒转染实验显示出载体在测量范围内具有极低的细胞毒性和很高的转染效率。结论聚合物聚乙二醇-b-(聚谷氨酸-g-聚乙烯亚胺)有望作为非病毒基因传递载体。

关键词：非病毒基因载体聚乙烯亚胺聚谷氨酸基因转染

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Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

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Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

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Laboratory evaluation of high-friction thin overlays for pavement preservation

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

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Aldehyde oxidase mediated enantioselective metabolic health risk of dinotefuran

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Science China Chemistry 2024年第6期67卷 2079-2091页

作者： Liwei xu Xinxin xu Hua Kuang Chuanlai xu Xiaoling Wu State Key Laboratory of Food Science and Resources Jiangnan UniversityWuxi214122China International Joint Research Laboratory for Biointerface and Biodetection and School of Food Science and Technology Jiangnan UniversityWuxi214122China Collaborative Innovation center of Food Safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi214122China

Chiral pollutants often pose significant differential environmental health *** this study,the biotransformation of chiral dinotefuran(DIN)and its enantioselective metabolic toxicity mechanisms have been systemically ***,reversedphase chromatography-high resolution mass spectrometry was developed to quantify the content of DIN R/S chiral enantiomer with pg level sensitivity,revealing a lower elimination rate constant(K_(e))of S-DIN(0.730 h^(-1))than R-DIN(0.746 h^(-1)).Secondly,the interaction mechanism between DIN metabolism and important endogenous bioactive molecules,such as aldehyde oxidase(AOX)and neurotransmitters,was *** DIN nitro-group was converted into a guanidine group by the reducing site of nearby flavin adenine dinucleotide(FAD)in AOX with the preferred higher affinity of ***,the endogenous tryptophan(Trp)aldehyde metabolic intermediate,5-hydroxyindoleacetaldehyde(5-HIAL),provides a persistent electron donor for DIN reduction via the oxidation-catalyzed site in AOX,resulting in remarkable up-regulation of monoamine neurotransmitters such as serotonin and ***,the higher level of neurotransmitters further mediated dysregulation of oxylipin homeostasis via the serotonergic pathway,where S-DIN exhibited more pronounced liver lipid damage and environmental health risk with the accumulated lipid biomarkers,oxidized triglyceride(OxTG)and oxidized sphingomyelin(OxSM).This study elucidates the AOX-mediated enantioselectivity metabolic pathway of DIN,providing a new analytical method for chiral pollutants and paves the way for their health risk assessments.

关键词： neonicotinoid dinotefuran enantiomer aldehyde oxidase metabolomics health risk

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Granting strength to aerogel fibers through encapsulation

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Science China Materials 2024年第4期67卷 1365-1366页

作者： Wenhui xu Department of Basic Chemistry School of PharmacyJiangxi University of Chinese MedicineNanchang 330004China

Aerogel fibers, distinguished by their lightweight nature, pronounced porosity, large surface area, and superior thermal insulation properties, have diversified applications in thermal management, energy devices, and environmental remediation[1]. However, compared with monolithic ones, these fibershaped aerogels exhibit limited mechanical strength and resilience due to their one-dimensional small size.

关键词： strength fibers thermal

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