Journal of Chemical Research-s最新文献_第3页

BODIPY-based fluorescent sensors for detection of explosives 用于探测爆炸物的基于bodipy的荧光传感器

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231168961

Yen Thi Nguyen, Seung-Hak Shin, Kiok Kwon, Namdoo Kim, S. Bae

引用次数: 1

Highly selective lanthanide-doped ion sieves for lithium recovery from aqueous solutions 用于从水溶液中回收锂的高选择性掺杂镧离子筛

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231159051

Lukang Zheng, Jin Chen, Jianke Sun, Min Liu, Yuyu Gao, Zhifeng Guo

{"title":"Highly selective lanthanide-doped ion sieves for lithium recovery from aqueous solutions","authors":"Lukang Zheng, Jin Chen, Jianke Sun, Min Liu, Yuyu Gao, Zhifeng Guo","doi":"10.1177/17475198231159051","DOIUrl":"https://doi.org/10.1177/17475198231159051","url":null,"abstract":"The increased global demand for lithium is rapidly depleting the lithium ore reserves. Therefore, attention has turned to the recovery of lithium from aqueous solutions, such as lithium-containing brine. Compared with other methods of lithium recovery, adsorption is energy efficient and simple to implement, increasing demand for selective lithium adsorbents. In this study, a selective lithium-ion adsorbent, H4Ti5–xLa x O12, was synthesized via the sol–gel method, followed by heat treatment and acid washing. The effects of the temperature and degree of lanthanum doping (x) on the crystalline phase, morphology, lithium-ion adsorption capacity, and lithium-ion selectivity of the ion sieve were investigated, and the optimal synthetic conditions were determined. We found that doping with La3+ cations (x = 0.01) increased the lithium-ion adsorption capacity (23.96 mg g−1 at 25 °C at pH = 12; 8.2% higher than before doping), rate, and selectivity. In addition, the ion sieve could be used over multiple adsorption–desorption cycles with only a minor reduction in the lithium-ion adsorption capacity (22.88 mg g−1). Overall, these results suggest that doping with La3+ cations stabilized the H4Ti5–xLa x O12 crystal structure, alleviated particle agglomeration, expanded the lithium-ion channels, and decreased the resistance to lithium-ion migration, thus improving adsorption performance. The findings suggest that the proposed ion sieve has practical applications in the selective recovery of lithium from aqueous solutions containing a mixture of metal ions.","PeriodicalId":15318,"journal":{"name":"Journal of Chemical Research-s","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81078167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A microwave-assisted and efficient reduction protocol for the synthesis of alkyl-substituted [2.2]-paracyclophanes 一种微波辅助高效还原合成烷基取代[2.2]-副环番烷的方法

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231164370

Mengyuan Tian, Lixiang Zhang, Lijing Gao, G. Xiao

引用次数: 0

Solubility and thermodynamic properties of sodium theophylline salt in aqueous sodium hydroxide solution at different temperatures 不同温度下茶碱钠在氢氧化钠水溶液中的溶解度和热力学性质

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231166563

Zhe Dong, L. Kong, Zhen Liu, Anming Yang

{"title":"Solubility and thermodynamic properties of sodium theophylline salt in aqueous sodium hydroxide solution at different temperatures","authors":"Zhe Dong, L. Kong, Zhen Liu, Anming Yang","doi":"10.1177/17475198231166563","DOIUrl":"https://doi.org/10.1177/17475198231166563","url":null,"abstract":"The solubility data of sodium theophylline salt in the water and aqueous sodium hydroxide systems with molarities of 0.00, 0.01, 0.10, 0.20, 0.49, and 0.96 mol kg−1 at temperatures ranging from 283.15 to 368.15 K are determined via the equilibrium method. The experimental results show that the solubility of sodium theophylline increases on increasing the temperature at the same concentration of NaOH solution and decreases with an increase in the NaOH concentration at the same temperature. These results correlate well with the polynomial empirical equation, the modified Apelblat equation, and the λh equation. At the same time, it is found that the modified Apelblat equation gives better correlation results than the polynomial empirical and the λh equations. The results show that the three models correlate well with the solubility data of sodium theophylline. The modified Van’t Hoff equation is used to estimate the thermodynamic properties including the dissolution enthalpy, the dissolution entropy, and the Gibbs free energy change of sodium theophylline when dissolved in aqueous NaOH solution at different concentrations. The solubility data and correlation results obtained from the experiments can provide basic data for the cooling crystallization, separation, and purification of sodium theophylline and are expected to be of great significance for the research and development of sodium theophylline and for caffeine production.","PeriodicalId":15318,"journal":{"name":"Journal of Chemical Research-s","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85179572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel, simple, and facile synthesis of 3-(3-benzyl-2,3-dihydrobenzo[d]thiazol-2-yl)benzo[d]oxazole-2(3H)-thione derivatives 一种新颖、简单、方便的3-(3-苄基-2,3-二氢苯并[d]噻唑-2-基)苯并[d]恶唑-2(3H)硫酮衍生物的合成方法

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231165254

M. Nassiri

引用次数: 0

Sonochemical synthesis and electrochemical performance of reduced graphene oxide/cerium dioxide nanocomposites 还原氧化石墨烯/二氧化铈纳米复合材料的声化学合成及电化学性能

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231158745

Rui-Juan Bai, Yunpeng Zhao, Cuiying Lu, Yu Meng, Wen-wen Gao, Yan Wang, Rui Dang, Miao Mu, Jinxi Wang, Y. Jiao

引用次数: 1

Continuous-flow Heck coupling reactions catalyzed by Pd complexes of amidoxime fibers 偕胺肟纤维Pd配合物催化的连续流Heck偶联反应

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231157010

Jiaxin Xie, Siyu Lu, Yilin Zhang, Xiaohan Lu, Z. Ding, Ting-xian Tao, Maodong Xu, Zhichuan Wu

{"title":"Continuous-flow Heck coupling reactions catalyzed by Pd complexes of amidoxime fibers","authors":"Jiaxin Xie, Siyu Lu, Yilin Zhang, Xiaohan Lu, Z. Ding, Ting-xian Tao, Maodong Xu, Zhichuan Wu","doi":"10.1177/17475198231157010","DOIUrl":"https://doi.org/10.1177/17475198231157010","url":null,"abstract":"Improving production efficiency and developing green catalytic systems are key issues for applying Heck coupling reactions in the chemical industry. In this study, an amidoxime-fiber-supported Pd catalyst is prepared from polyacrylonitrile fiber, hydroxylamine hydrochloride, and PdCl2. The morphology and structure of amidoxime-fiber-supported Pd are characterized by scanning electron microscopy, energy-dispersive spectroscopy, X-ray photoelectron spectrometer, X-ray diffraction, and inductively coupled plasma-optical emission spectrometer. A packed-bed flow reactor is designed and employed for catalysis of the Heck reaction of iodobenzene and styrene based on the amidoxime-fiber-supported Pd catalyst. The effects of reaction temperature, flow rate, cycle time, and reactant concentration on the conversion and yield are investigated. The results show that the optimal conditions for the continuous-flow single reactor are 70 °C, iodobenzene concentration of 30 mmol L−1 in a solution of N,N-dimethylformamide (100 mL) under continuous flow at a flow rate of 2 mL min−1. The catalyst showed good activity and stability after a continuous operation time of 50 h, with catalytic activity 2.21 times higher than that obtained with traditional batch reaction. Furthermore, we have established a new flow reaction system based on the numbering-up of reactors with a parallel connection. The catalytic efficiency of four parallel reactors is four times higher than that of a single reactor. Kinetic studies reveal that the reaction has low activation energy (8.8771 kJ mol−1), indicating that amidoxime-fiber-supported Pd has good catalytic activity. This research provides an alternative pathway for highly efficient Heck coupling in continuous flow.","PeriodicalId":15318,"journal":{"name":"Journal of Chemical Research-s","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85138705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic study on the adsorption of some polycyclic aromatic hydrocarbons using dinitrodiphenyldiquinoline adsorbent 二硝基二苯基二喹啉吸附剂吸附多环芳烃的动力学研究

Journal of Chemical Research-s Pub Date : 2023-03-01 DOI: 10.1177/17475198231168949

Salah A Al-Trawneh

{"title":"Kinetic study on the adsorption of some polycyclic aromatic hydrocarbons using dinitrodiphenyldiquinoline adsorbent","authors":"Salah A Al-Trawneh","doi":"10.1177/17475198231168949","DOIUrl":"https://doi.org/10.1177/17475198231168949","url":null,"abstract":"In this study, a dinitrodiphenyldiquinoline derivative is synthesized, purified, and characterized, and its adsorptive ability is examined for the first time. Twelve common polycyclic aromatic hydrocarbons are chosen as potential adsorbates for removal by using dinitrodiphenyldiquinoline as an adsorbent surface. The adsorptive capacity and the efficiency of removal depend on several variables such as adsorbent dose, polycyclic aromatic hydrocarbon initial concentration, pH, and contact time. This paper summarizes the adsorbent parameters and the kinetic models that can optimize and describe the adsorption process used to treat aqueous solutions of polycyclic aromatic hydrocarbons. Experimentally, the optimum adsorbent dose, the initial concentration, and contact time are found to be 0.1 g, 1 ppm, and 60 min, respectively. Mathematical treatment of the adsorption data reveals that the adsorption of all the polycyclic aromatic hydrocarbons by dinitrodiphenyldiquinoline adopted a pseudo second-order adsorption model. As a result, the dinitrodiphenyldiquinoline derivative is found to be a very good adsorbent surface for several hazardous organic pollutants such as polycyclic aromatic hydrocarbons.","PeriodicalId":15318,"journal":{"name":"Journal of Chemical Research-s","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79643577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Reactions of 4,5-difluoro-1,2-dinitrobenzene with amines in dimethylformamide or EtOH 4,5-二氟-1,2-二硝基苯与胺在二甲基甲酰胺或乙醚中的反应

Journal of Chemical Research-s Pub Date : 2023-01-01 DOI: 10.1177/17475198231154812

M. Plater, W. Harrison

引用次数: 0

Synthesis and photocatalytic activity of a lanthanum doped CoFe2O4/TiO2 nanocomposite for photodegradation of methylene blue organic dye 镧掺杂CoFe2O4/TiO2纳米复合材料光降解亚甲基蓝有机染料的合成及其光催化活性

Journal of Chemical Research-s Pub Date : 2023-01-01 DOI: 10.1177/17475198221151152

Hue TM Dang, M. Nguyen, L. T. Tran, H. V. Tran, C. D. Huynh

引用次数: 0