Gold Bulletin最新文献_第8页

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

Development of a hydrometallurgical process for the recovery of gold and silver powders from anode slime containing copper, nickel, tin, and zinc 从含铜、镍、锡、锌的阳极泥中回收金银粉末的湿法冶金工艺的开发

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-03-20 DOI: 10.1007/s13404-019-00254-0

Wei Dong Xing, Man Seung Lee

{"title":"Development of a hydrometallurgical process for the recovery of gold and silver powders from anode slime containing copper, nickel, tin, and zinc","authors":"Wei Dong Xing, Man Seung Lee","doi":"10.1007/s13404-019-00254-0","DOIUrl":"https://doi.org/10.1007/s13404-019-00254-0","url":null,"abstract":"In order to recover gold and silver from anode slimes containing Cu, Ni, Sn, and Zn, an integrated hydrometallurgical process consisting of leaching, solvent extraction, and cementation was developed. All the metals together with 10% of Ag(I) were dissolved by the mixture of HCl and H2O2 at the optimum conditions. Separation of Au (III) together with Sn (II) was performed by Cyanex 272 from the leaching solution with two-stage counter current extraction. Stripping of Au (III) and Sn (II) from the loaded organic phase was sequentially carried out by NH4Cl and NaOH. Cu (II) in the raffinate after Au (III) extraction was separated by LIX 63 with three-stage counter current extraction. Pure Cu (II) solution was recovered from the loaded LIX 63 by stripping with dilute HCl solution. Ag powders with extra high purity were obtained by cementation with copper sheet from the raffinate after Cu (II) separation. Au (III) (99.3%) and 96.8% of Sn (II) were recovered by extraction, and purity of Au (III) and Sn (II) stripping solutions was found to be 99.99%. Au powders with extra high purity were directly synthesized by adding ascorbic acid solution into the NH4Cl stripping solution.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"52 2","pages":"69 - 77"},"PeriodicalIF":2.2,"publicationDate":"2019-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-019-00254-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5095247","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: 14

Electric field–prevented adsorption of hydrogen on supported gold nanoparticles 电场阻止氢在负载金纳米颗粒上的吸附

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-02-12 DOI: 10.1007/s13404-019-00253-1

Sergey Yu. Sarvadiy, Andrey K. Gatin, Maxim V. Grishin, Vasiliy A. Kharitonov, Nickolay N. Kolchenko, Nadezhda V. Dokhlikova, Boris R. Shub

{"title":"Electric field–prevented adsorption of hydrogen on supported gold nanoparticles","authors":"Sergey Yu. Sarvadiy, Andrey K. Gatin, Maxim V. Grishin, Vasiliy A. Kharitonov, Nickolay N. Kolchenko, Nadezhda V. Dokhlikova, Boris R. Shub","doi":"10.1007/s13404-019-00253-1","DOIUrl":"https://doi.org/10.1007/s13404-019-00253-1","url":null,"abstract":"The adsorption of hydrogen on the surface of gold nanoparticles deposited on a graphite support was studied in the presence of an external electric field by means of scanning tunneling microscopy (STM) and spectroscopy (STS). Hydrogen was adsorbed from the gas phase onto the surface of gold nanoparticles synthesized by impregnation-precipitation method. During the adsorption process, the STM tip was removed from the surface of the sample so that the measurable tunneling current could not flow, and potential differences of various polarities were applied to the vacuum gap between the sample and the grounded tip. Thus, the system of the STM tip and sample surface formed an asymmetric capacitor inside which an inhomogeneous electric field existed. No hydrogen adsorption was observed in the case of a positive potential difference, while dissociative adsorption of hydrogen took place in the cases of zero and negative potential differences. The ability to control the adsorption process of hydrogen by means of a weak electric field was demonstrated.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"52 2","pages":"61 - 67"},"PeriodicalIF":2.2,"publicationDate":"2019-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-019-00253-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4487600","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: 8

Surface plasmon resonance of naked gold nanoparticles for photodynamic inactivation of Escherichia coli 裸金纳米颗粒表面等离子体共振对大肠杆菌光动力失活的研究

IF 2.2 4区工程技术

Gold Bulletin Pub Date : 2019-02-06 DOI: 10.1007/s13404-019-00252-2

Sahar Mohammadpour Lashkari, Hasan Kariminezhad, Nazanin Safarnezhad, Hossein Amani

{"title":"Surface plasmon resonance of naked gold nanoparticles for photodynamic inactivation of Escherichia coli","authors":"Sahar Mohammadpour Lashkari, Hasan Kariminezhad, Nazanin Safarnezhad, Hossein Amani","doi":"10.1007/s13404-019-00252-2","DOIUrl":"https://doi.org/10.1007/s13404-019-00252-2","url":null,"abstract":"Although antimicrobial photothermal inactivation of naked gold nanostructures using powerful pulsed lasers has been previously studied, there are little reports about their photodynamic antimicrobial properties under the irradiation of low-power density continuous wave lasers. Therefore, this paper attempts to fill this gap. In this paper, we studied the effects of a 40-mW/cm2 continuous Nd:Yag laser at 532?nm and naked gold nanoparticles on inactivation of Escherichia coli ATCC25922. According to our results, 60?min illumination using the Nd:Yag laser caused a 0.15log reduction of the bacterial viability. Also, the employed gold nanoparticles with an average size of 15?nm were toxic to E. coli ATCC 25922 in the concentrations above 0.5?μg/ml. In addition, synergistic effects of 0.5?μg/ml gold nanoparticles and the light illumination led to a 2.43log reduction of the viability after a 60-min exposure and did not show any considerable temperature change on the media. The obtained results were justified based on the possible interaction mechanisms of low-power density laser lights and naked gold nanoparticles. The paper is proposed as a prelude for future research about localized inactivation of resistant pathogens with minimum side effects on neighbor tissues.","PeriodicalId":581,"journal":{"name":"Gold Bulletin","volume":"52 1","pages":"51 - 60"},"PeriodicalIF":2.2,"publicationDate":"2019-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-019-00252-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4244528","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: 6