Characteristics of Adsorption of Complex Metal-Ammines and other Complex Ions of Zinc, Copper, Cobalt, Nickel and Silver on Silica Gel

Smith, Grant W.; Jacobson, H. W.

doi:10.1021/j150541a047

Cited by 22 publications

(9 citation statements)

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“…However, the differences in the adsorption systems used should be compared to evaluate the reported qmax objectively. For instance, silica gel has a Cu qmax of 2 mmol g -1 at pH 6 in the presence of 6 M NH3 (Smith and Jacobson, 1956). Graphite oxide (GO) has a Cu qmax of 22 mmol g -1 in a system with 0.6 M NH3 and pH 11.2 (Kovtjukhova and Karpenko, 1992).…”

Section: 4biosorption Isothermsmentioning

confidence: 99%

“…Thus, aside from metal speciation, the complex ion orientation on the biosorbent surface could have affected the adsorption. The number of hydrogens that are spaced properly to form hydrogen bonds with the biosorbent surface oxygen atoms is important in complex ion adsorption (Smith and Jacobson, 1956). It is possible that the Cu(II)-ammine complexes attached to the biosorbent surface on their edge, resulting in more available adsorption sites, and thus, higher amounts of Cu(II)-ammine complex adsorbed.…”

Section: Competition and Selectivity Between Cu(ii) And Zn(ii)mentioning

confidence: 99%

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Selective copper recovery from ammoniacal waste streams using a systematic biosorption process

et al. 2022

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Highlights• A top-down approach optimized Cu biosorption from a real Cu-NH3 leachate • Pinecone (PC) has a high Cu qmax of 1.1 mmol g -1 despite 2 M NH3 and 5 mM Zn present • PC works over wide pH range (5-12) relevant for treating (NH4)2CO3 rich effluents• PC has a selectivity quotient (KCu/Zn) of 3.97 making it selective for Cu over Zn• The presence of Zn can improve the qmax of PC for Cu from NH3-rich streams ABSTRACT Cu-NH3 bearing effluents arise from electroplating and metal extraction industries, requiring innovative and sustainable Cu recovery technologies to reduce their adverse environmental impact. CO3 2and Zn are often co-occurring, and thus, selective Cu recovery from these complex liquid streams is required for economic viability. This study assessed 23 sustainable biosorbents classified as tannin-rich, lignin-rich, chitosan/chitin, dead biomass, macroalgae or biochar for their Cu adsorption capacity and selectivity in a complex NH3-bearing bioleachate.Under a preliminary screen with 12 mM Cu in 1 M ammoniacal solution, most biosorbents showed optimal Cu adsorption at pH 11, with pinecone remarkably showing high removal efficiencies (up to 68%) at all tested pH values. Further refinements on select biosorbents with pH, contact time, and presence of NH3, Zn and CO3 2showed again that pinecone has a high maximum adsorption capacity (1.07 mmol g -1 ), worked over pH 5-12 and was Cu-selective with 3.97 selectivity quotient (KCu/Zn). Importantly, pinecone performance was maintained in a real Cu/NH3/Zn/CO3 2bioleachate, with 69.4% Cu removal efficiency. Unlike synthetic adsorbents, pinecones require no pre-treatment, which together with its abundance, selectivity, and efficiency without the need for prior NH3 removal, makes it a competitive and sustainable Cu biosorbent for complex Cu-NH3 bearing streams. Overall, this study demonstrated the potential of integrating bioleaching and biosorption as a clean Cu recovery technology utilizing only sustainable resources (i.e., bio-lixiviant and biosorbents). This presents a closed-loop approach to Cu extraction and recovery from wastes, thus effectively addressing elemental sustainability.

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Section: 4biosorption Isothermsmentioning

confidence: 99%

Section: Competition and Selectivity Between Cu(ii) And Zn(ii)mentioning

confidence: 99%

Selective copper recovery from ammoniacal waste streams using a systematic biosorption process

et al. 2022

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“…We have recently demonstrated that the chemical reactivity of the surface silanol groups, directed to the fixation of Cu(II) species in the presence of ammonia [119], can be advantageously combined to their voltammetric determination by using a SiO 2 -MCPE [149,150]. The procedure involves a preconcentration step in ammoniacal medium, the transfer to the analysis cell containing 0.2 M HNO 3 in order to achieve the complete hydrolysis of the previously accumulated Cu(II) species, and the subsequent detection by anodic stripping square-wave voltammetry.…”

Section: Pure Silica-based Electrodesmentioning

confidence: 99%

“…Silanols are weakly acid groups (pK a around 7) which can be deprotonated by ammonia or organic amines [115][116][117][118]. It has been shown that this ionization of silanols greatly enhances the fixation of metal cations on silica surfaces [94,106,[119][120][121].…”

Section: Introduction To the Chemistry Of Silicamentioning

confidence: 99%

Analytical Applications of Silica-Modified Electrodes -A Comprehensive Review

Walcarius

1999

Electroanalysis

150

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This article aims to review the electroanalytical applications of chemically modified electrodes involving silica and silica-containing matrices. After a brief introduction to silica chemistry, the implication of pure and grafted silicas in electrochemistry, as well as that of the silica-based materials originating from the sol-gel technology, will be discussed. The interest of silica-modified electrodes (SiO 2 -MEs) with respect to electroanalysis will be pointed out by means of several examples. In the last five years, successful applications of SiO 2 -MEs have been achieved. Among them, silica grafted with inorganic films or organic moieties was successfully applied to the selective preconcentration or the electrocatalytic detection of various analytes. Also, the ability of the sol-gel chemistry to encapsulate enzymes within a silica matrix without preventing its activity was exploited in the development of new amperometric biosensors. These promising fields are thought to lead to significant advances in the near future, because of the explosive growth in both the synthesis of novel mesoporous organically-modified silica-based materials and the huge development of sol-gel chemistry in tailoring and construction of new modified electrodes.

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“…При химическом модифицировании кремнеземных материалов соединениями металлов используются процессы адсорбции и последующего термического разложения поверхностных соединений. Результаты изучения адсорбции аммиачных комплексов меди и серебра на силикагеле [10] позволили применить такие соединения для получения кремнеземных нанокомпозитов.…”

Section: Introductionunclassified

Influence of aging under the light on the fungicidal activity of silvercontaining silica nanocomposites

Bogatyrov¹,

Oranska²,

Galaburda³

et al. 2016

Poverhn.

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Исследованы образцы кремнеземов, модифицированных соединениями серебра и парой металлов серебро-медь. Содержание серебра составляло от 1,0 до 0,01 ммоль/г SiO 2 , а меди -0,2 -0,1 ммоль/г. Методами рентгенофазового анализа и электронной спектроскопии исследованы изменения соединений серебра в кремнеземной матрице при световом старении в течение 7-30 дней. Установлено возрастание содержания кристаллического Ag 0 , при этом существенных изменений в фунгицидной активности не наблюдалось.

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Characteristics of Adsorption of Complex Metal-Ammines and other Complex Ions of Zinc, Copper, Cobalt, Nickel and Silver on Silica Gel

Cited by 22 publications

References 0 publications

Selective copper recovery from ammoniacal waste streams using a systematic biosorption process

Selective copper recovery from ammoniacal waste streams using a systematic biosorption process

Analytical Applications of Silica-Modified Electrodes -A Comprehensive Review

Influence of aging under the light on the fungicidal activity of silvercontaining silica nanocomposites

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