Gold Bulletin最新文献_第7页

Gold-decorated sulfur-doped carbon nanotubes as electrocatalyst in hydrogen evolution reaction 金修饰硫掺杂碳纳米管作为析氢反应的电催化剂

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2020-05-02 DOI: 10.1007/s13404-020-00275-0

Hossein Tavakol, Mohammad Zhiani, Fereshteh Shareifyan-ghahfarokhi

{"title":"Gold-decorated sulfur-doped carbon nanotubes as electrocatalyst in hydrogen evolution reaction","authors":"Hossein Tavakol, Mohammad Zhiani, Fereshteh Shareifyan-ghahfarokhi","doi":"10.1007/s13404-020-00275-0","DOIUrl":"https://doi.org/10.1007/s13404-020-00275-0","url":null,"abstract":"In the present work, sulfur-doped carbon nanotubes (SCNTs) have been prepared using chemical vapor deposition method and various cobalt-containing catalysts. In this line, simple and silica-supported cobalt nanoparticles (Co and Co/SiO2) and 5 cobalt spinels (MCo2O4, M?=?Ni, Cu, Mn, Fe, Cr, and Mg) were used as the growth catalysts and four different temperatures (600, 650, 700, and 750?°C) were used to obtain the optimized condition for the preparation of SCNTs. Among the employed catalysts, Co/SiO2 at 600?°C showed the higher abilities for the preparation of desired SCNTs. All products were characterized using FESEM, EDS, XRD, Raman, static contact angle, TGA, and DTA analyzes. The electrochemical behaviors of the two best products (SCNTs-Co/SiO2 and SCNTs-Co) in hydrogen evolution reaction (HER) were examined, which confirmed the higher ability of SCNTs-Co/SiO2. This best product was decorated with 2, 5, and 10% of gold nanoparticles to examine the effect of gold decoration of the properties and electrochemical abilities of the product. All decorated products exposure the higher electrochemical potencies versus the simple SCNTs and among the decorated products, 10% Au-SCNT was the most appropriate product for this purpose with small differences with the other ones.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"53 2","pages":"63 - 76"},"PeriodicalIF":2.2,"publicationDate":"2020-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-020-00275-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4097297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Probable daily return on investments in gold 黄金投资的每日可能回报

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2020-03-10 DOI: 10.1007/s13404-020-00273-2

Muhammad Shujaat Nawaz, Muhammad Azam, Muhammad Aslam

引用次数: 1

Characterization of gold nanoparticle thin film prepared by electrophoretic deposition method 电泳沉积法制备金纳米颗粒薄膜的表征

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2020-01-25 DOI: 10.1007/s13404-020-00268-z

Samira Hosseingholilou, Davoud Dorranian, Mahmood Ghoranneviss

{"title":"Characterization of gold nanoparticle thin film prepared by electrophoretic deposition method","authors":"Samira Hosseingholilou, Davoud Dorranian, Mahmood Ghoranneviss","doi":"10.1007/s13404-020-00268-z","DOIUrl":"https://doi.org/10.1007/s13404-020-00268-z","url":null,"abstract":"Gold nanoparticle thin films were deposited on copper substrate using electrophoretic deposition (EPD) method. At first, gold nanoparticles were synthesized, using pulsed laser ablation method of a high-purity gold target in distilled water. Ablation was carried out, employing the fundamental wavelength of a Q-switched Nd:YAG laser at 1064?nm and pulse width of 7?ns. Suspension of gold nanoparticle was used as the electrolyte of EPD, in which two copper electrodes with 7?mm gap were immersed. Five samples of gold nanoparticle thin films were prepared at different deposition times and applied voltages. Nanoparticles and thin films were characterized by different diagnostics such as X-ray diffraction pattern, atomic force microscopy (AFM), and scanning electron microscopy (SEM) images as well as optical spectroscopy. XRD pattern determined crystalline structure of gold thin films. SEM image showed the effect of deposition time and applied voltage on the morphology of deposited films. AFM results demonstrated the variations in roughness, thickness, and surface quality due to changes in applied voltage and deposition time. Also, the optical properties of thin films were studied by UV-vis reflection spectroscopy.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"53 1","pages":"1 - 10"},"PeriodicalIF":2.2,"publicationDate":"2020-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-020-00268-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5338659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Novel approach for selective recovery of gold, copper, and iron as marketable product from industrial effluent 从工业废水中选择性回收金、铜和铁作为市场产品的新方法

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2020-01-22 DOI: 10.1007/s13404-020-00269-y

Rekha Panda, Om Shankar Dinkar, Manis Kumar Jha, Devendra Deo Pathak

{"title":"Novel approach for selective recovery of gold, copper, and iron as marketable product from industrial effluent","authors":"Rekha Panda, Om Shankar Dinkar, Manis Kumar Jha, Devendra Deo Pathak","doi":"10.1007/s13404-020-00269-y","DOIUrl":"https://doi.org/10.1007/s13404-020-00269-y","url":null,"abstract":"Globally, continuous R & D efforts are being made to recuperate precious metals from wastes in order to conserve the natural resources as well as minimize environmental pollution. Keeping in view of the above, a process has been developed to recover gold from industrial effluent using hydrometallurgical route. Initially, the effluent was pre-treated using precipitation and solvent extraction techniques to remove impurities, i.e., iron and copper as value added products. Iron was removed up to 99.99% at pH ~?3.5. Further, copper was extracted using 10% LIX 84IC maintaining phase ratio 1/1 in mixing time of 15?min and equilibrium (eq.). pH?2.2. Selective adsorption of gold was carried out using ionenaustauscher-II and resulted in 99% gold adsorption between pH?7 and 8 in contact time of 30?min. Experimental results obtained for the adsorption of gold was found to follow second order reaction and fitted well with the Freundlich isotherm. Gold from the loaded resin was eluted using a mixture of hydrochloric acid and thiourea. From the pure gold solution, metal could be produced using cementation/charcoal adsorption followed by heat treatment, respectively.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"53 1","pages":"11 - 18"},"PeriodicalIF":2.2,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-020-00269-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4861722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Mechanistic investigation of facilitated transport of gold(III) from HCl media using ionic liquid Cyphos IL102 as carrier across a supported liquid membrane 以离子液体Cyphos IL102为载体，通过支撑液膜促进金(III)从HCl介质中迁移的机理研究

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-11-12 DOI: 10.1007/s13404-019-00262-0

F. J. Alguacil

引用次数: 11

Synthesis of gold nanoparticles supported at graphene derivatives using green reductants and evaluation of their catalytic activity in 4-nitrophenol reduction 绿色还原剂负载石墨烯衍生物的金纳米颗粒的合成及其对4-硝基苯酚还原的催化活性评价

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-06-01 DOI: 10.1007/s13404-019-00258-w

Dong Hoon Choi, Jee Eun Hong, Yeonghun Jung, Hye In Park, Seung Tae Baek, Su Jeong Kim, Chan Gook Lee, Youmie Park, Seok Ju Park, Yohan Park

{"title":"Synthesis of gold nanoparticles supported at graphene derivatives using green reductants and evaluation of their catalytic activity in 4-nitrophenol reduction","authors":"Dong Hoon Choi, Jee Eun Hong, Yeonghun Jung, Hye In Park, Seung Tae Baek, Su Jeong Kim, Chan Gook Lee, Youmie Park, Seok Ju Park, Yohan Park","doi":"10.1007/s13404-019-00258-w","DOIUrl":"https://doi.org/10.1007/s13404-019-00258-w","url":null,"abstract":"In this study, gold nanoparticles were supported at graphene derivatives (AuNPs@GDs) from chloroauric acid and graphene oxide (GO) by using sodium citrate, L-ascorbic acid, and 4-(2-hydroxyethyl)-1-piperazineethane-sulfonic acid (HEPES) as green reductants to evaluate the catalytic activity in the 4-nitrophenol (4-NP) reduction system. Among the three reductants, HEPES which derived AuNP@GD (3) exhibited up to 8.44-fold higher catalytic activity compared with sodium citrate and L-ascorbic acid. To evaluate the influence of mass ratio between Au and GO on the catalytic activity, we controlled adding amounts of chloroauric acid while the other conditions using HEPES were fixed. Notably, decreasing the mass ratio of Au/GO from 0.59 to 0.10 increased the rate constant in the range of 7.6?×?10?3 to 16.1?×?10?3/s. However, when the turnover frequency (TOF) was considered, the maximum value was obtained when Au/GO was 0.39. It can be concluded that AuNPs@GD (4) synthesized using HEPES significantly improved the catalytic activity in both rate constant (10.4?×?10?3/s) and TOF (8.08?×?10?5?mol/g·s) in 4-NP reduction. These results suggest that the type of reductants used to synthesize AuNPs@GDs is a significant factor on the catalytic activity and that GO can help increase the catalytic activity, but has an effective ratio with Au.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"52 3-4","pages":"165 - 174"},"PeriodicalIF":2.2,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-019-00258-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4037664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermal stability of oxide-supported gold nanoparticles 氧化负载金纳米颗粒的热稳定性

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-05-16 DOI: 10.1007/s13404-019-00259-9

Nazila Masoud, Tomas Partsch, Krijn P. de Jong, Petra E. de Jongh

引用次数: 36

Horseradish peroxidase-AuNP/LDH heterostructures: influence on nanogold release and enzyme activity 辣根过氧化物酶- aunp /LDH异质结构:对纳米金释放和酶活性的影响

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-05-08 DOI: 10.1007/s13404-019-00256-y

Elena-Florentina Grosu, Renato Froidevaux, Gabriela Carja

{"title":"Horseradish peroxidase-AuNP/LDH heterostructures: influence on nanogold release and enzyme activity","authors":"Elena-Florentina Grosu, Renato Froidevaux, Gabriela Carja","doi":"10.1007/s13404-019-00256-y","DOIUrl":"https://doi.org/10.1007/s13404-019-00256-y","url":null,"abstract":"Gold nanostructures (AuNP) are important as strong platforms for targeted therapeutic and diagnostic applications. Tireless effort has been devoted nowadays to explore the multifunctionality of AuNP in multicomponent biostructures. Herein, we report the fabrication of horseradish peroxidase enzyme (HRP)-AuNP/ZnAlLDH heterostructure by the facile synthesis of AuNP on the biocompatible matrices of layered double hydroxides (LDH) followed by the immobilization of the enzyme on AuNP/LDH assemblies. During this process, ZnAlLDH have a dual function of exploring its structural “memory effect” for the synthesis of nanogold and acting as a support for the enzyme immobilization. X-ray diffraction (XRD), UV-Vis spectrometry, transmission electronic microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and infrared (FTIR) spectroscopy have been used to characterize the structural, chemical composition, optical, and morphology of the novel materials. We present here the release of AuNP from HRP-AuNP/ZnAlLDH by using as controlled variables HRP:LDHs ratio and the pH of the solution. Results show that AuNP established close interactions with HRP and formed an HRP-AuNP bioconjugate. Results reveal that HRP suffers a significant loss of the activity in the presence of nanoparticles of gold, such that, AuNP act to inhibit the activity of the enzyme. AuNP behavior in enzyme-bio-heterostructures should be inspiring for future applications of AuNP in nanomedicine.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"52 2","pages":"87 - 97"},"PeriodicalIF":2.2,"publicationDate":"2019-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-019-00256-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4349293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Detoxification of gold surfaces by OH• treatment OH•处理对金表面的解毒作用

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-05-07 DOI: 10.1007/s13404-019-00257-x

Katja Vahl, Tyll Utesch, Ulrich Hasse, Heike Kahlert, Robert S. Jack, Andreas Bollmann, Klaus Lücke, Fritz Scholz

引用次数: 0

Improvement of amperometric laccase biosensor using enzyme-immobilized gold nanoparticles coupling with ureasil polymer as a host matrix 用酶固定金纳米颗粒偶联脲脲聚合物作为宿主基质改进安培漆酶生物传感器

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-05-07 DOI: 10.1007/s13404-019-00255-z

T. Kavetskyy, N. Stasyuk, O. Smutok, O. Demkiv, Y. Kukhazh, N. Hoivanovych, V. Boev, V. Ilcheva, T. Petkova, M. Gonchar

引用次数: 16