Download or read book The Mechanisms of Adsorption of Ag CN 2 and Ag on to Activated Carbon written by and published by . This book was released on 1992 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver is adsorbed onto activated carbon from potassium cyanide solution initially in the form of the K+Ag(CN)2- ion pair. Infrared spectra suggest that the cyanide stretching frequency for Ag(CN)2- is shifted to lower wavenumbers upon adsorption, to approximately that of Ag(CN)4 3-. This may be a result of an aggregation of the species on the carbon surface. Boiling in hydrochloric acid results in the formation of AgCN and AgCl. The presence of AgCN is also indicated on Ag(CN)2- -loaded carbons that have dried at temperatures of 120 degrees C or higher. Subsequent treatment with hot sodium hydroxide solution results in the reduction of all of the silver on the carbon to the metallic state, with some desorption of Ag(CN)2-. When silver is loaded onto activated carbon from a silver nitrate solution, adsorption takes place via a dual mechanism, with reduction to metallic silver and precipitation of AgCl both taking place on the carbon surface.
Download or read book Activated Carbon Adsorption written by Roop Chand Bansal and published by CRC Press. This book was released on 2005-05-24 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: High surface area, a microporous structure, and a high degree of surface reactivity make activated carbons versatile adsorbents, particularly effective in the adsorption of organic and inorganic pollutants from aqueous solutions. Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption
Download or read book The Mechanism of Adsorption of Dicyanoaurate on Activated Carbon written by Arturo Sabio Ibrado and published by . This book was released on 1992 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanisms of Adsorption of Hg CN 2 and HgCl2 on to Activated Carbon written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury is found to adsorb on to activated carbon in the form of Hg(CN)2 from cyanide solution. The Hg(CN)4(2-) species displays a negligible affinity for carbon. The adsorptive behaviour of mercuric cyanide species on to activated carbon is shown to be consistent with the distribution profile of the solution species. The adsorption of mercury from chloride solution occurs by reduction to the mercury (I) species, with subsequent precipitation of insoluble Hg2Cl2 within the pores of the carbon.
Download or read book The Recovery Of Gold From Secondary Sources written by Syed Sabir and published by World Scientific. This book was released on 2016-06-29 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: New discoveries of the properties of gold at a nanoscale, and its effective use in modern technologies, have been driving a virtual 'gold rush'. Depleting natural resources has meant that the recovery of gold continues to grow in importance and relevance.The Recovery of Gold from Secondary Sources analyses the most advanced technology in gold recovery and recycling from spent sources of mobile phones, unwanted electronic equipment and waste materials. State-of-the-art techniques of hydrometallurgical and bio-metallurgical processing, leaching, cementing, adsorbing and separation through bio-sorbents are all described in detail, providing a guide for students and researchers. Discussion of environmentally friendly methods of recovery are presented, in order to provide modern-day alternatives to previous techniques. For those interested in the study of gold recovery this book gives a comprehensive overview of current recovery, making it the ultimate source of information for students, researchers, chemists, metallurgists, environmental scientists and electronic waste recovery experts.
Download or read book Adsorption of the Cyano Complexes of Groups IB and IIB Metals on Activated Carbon written by Arturo Sabio Ibrado and published by . This book was released on 1986 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemistry Physics of Carbon written by Ljubisa R. Radovic and published by CRC Press. This book was released on 2000-11-09 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Provides an overview of scientific and technological issues in environmental applications of carbon materials. Emphasizes the versatility of carbon materials in both gas- and liquid-phase environmental applications, including a discussion of emerging technologies. Highlights the power and potential opportunities afforded by NMR spectroscopy for understanding the interaction of carbon materials with adsorbed molecules."
Download or read book The Mechanism of Adsorption of Au CN 4 Onto Activated Carbon written by and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Au(CN)4(-) species adsorbs onto activated carbon as a chemically unchanged ion pair of the type M(n+)[Au(CN)4(-)]n, in a manner similar to that postulated for Au(CN)2(-). The affinity of carbon for Au(CN)4(-) is greater than that for Au(CN)2(-). A Mossbauer spectroscopic investigation has confirmed that Au(CN)4(-) is the species adsorbed from both acidic and neutral solutions. The Mossbauer spectrum of carbon that is loaded with Au(CN)4(-) and subsequently boiled in hydrochloric acid is interpreted in terms of the presence of Au(CN)2Cl2(-), Au(CN)2(-) and AuCN as products of the decomposition of Au(CN)4(-).
Download or read book Clean Coal Technologies written by Rajesh Kumar Jyothi and published by Springer Nature. This book was released on 2021-05-10 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the state of art of the several advanced approaches to beneficiation of coal. The influence of recent technology attains the advantages of processing coal, purification studies, rheological behavior, and the mineral beneficiation. The experts collected in this volume have contributed significantly to the enrichment in the in depth knowledge not only in context of working knowledge, but also future prospects of clean coal technology.
Download or read book Metallurgical Transactions written by and published by . This book was released on 1993 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the South African Institute of Mining and Metallurgy written by South African Institute of Mining and Metallurgy and published by . This book was released on 1996 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rare Earth Metal Recovery for Green Technologies written by Rajesh Kumar Jyothi and published by Springer Nature. This book was released on 2020-03-25 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the development, use, extraction, and recovery of rare earth metals. Rare earth elements (REEs) occupy a key role in daily life in industrial applications. They are one of the critical elements for energy and sustainable growth. REEs are utilized in many modern electrical and electronic devices such as smart phones, computers, LED lights etc. Recovery of the REEs from secondary resources represents a way to meet the growing demand for electronic devices. Because of their rarity, utility, and importance, the recovery, utilization and recycling of rare earth metals is of utmost importance. This book presents both current methods of processing rare earths from primary and secondary sources and new, green routes for their isolation and purification. The book also addresses their utilization, re-use, reduction, and recycling policies that exist globally. Applications in metallurgy, magnets, ceramics, electronics, and chemical, optical, and nuclear technologies are discussed.
Download or read book The Mechanism of the Adsorption of Gold Cyanide on Activated Carbon written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray photoelectron spectroscopy showed that the adsorption of gold cyanide on carbon in the presence or absence of electrolytes and acids proceeds by the same mechanism. Although the identity of the gold cyanide adsorbate is not known, the mechanism appears to have an initial adsorption stage that involves the adsorption of an ion pair: M(n+)[Au(CN)2(-)]n, where M(n+) is a metal ion (for example Na+, K+ and Ca(2+) that has a lower solubility than the Au(CN)2(-) anion in the adsorption medium, followed by a reduction step in which either a sub-stoichiometric Au(CN)x surface species or a cluster-type compound of gold is formed.
Download or read book The Chemistry of Gold Extraction written by John Marsden and published by SME. This book was released on 2006 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively revised and updated, this edition provides the broad base of knowledge required by all working in the gold extraction and gold processing industries. It bridges the gap between research and industry by emphasizing practical applications of chemical principles and techniques.
Download or read book Activated Carbon written by Harry Marsh and published by Elsevier. This book was released on 2006-07-12 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have seen an expansion in speciality uses of activated carbons including medicine, filtration, and the purification of liquids and gaseous media. Much of current research and information surrounding the nature and use of activated carbon is scattered throughout various literature, which has created the need for an up-to-date comprehensive and integrated review reference. In this book, special attention is paid to porosities in all forms of carbon, and to the modern-day materials which use activated carbons - including fibres, clothes, felts and monoliths. In addition, the use of activated carbon in its granular and powder forms to facilitate usage in liquid and gaseous media is explored. Activated Carbon will make essential reading for Material Scientists, Chemists and Engineers in academia and industry. - Characterization of porosity - The surface chemistry of the carbons - Methods of activation and mechanisms of adsorptio - Computer modelling of structure and porosity within carbons - Modern instrumental analytical methods
Download or read book Effect of Metal Impurities on the Adsorption of Gold by Activated Carbon in Cyanide Solutions written by S. A. N. Sheya and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the First International Conference on Hydrometallurgy ICHM 88 written by Yulian Zheng and published by Pergamon. This book was released on 1989 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
