Characterization of cobalt precipitation tube synthesized through “silica garden” route

Parmar, Kavita; Chaturvedi, Hema T.; Akhtar, Wasi; Chakravarty, Sanchita; Das, Swapan K; Pramanik, Ashit; Ghosh, Mainak; Panda, A. K.; Bandyopadhya, N.R.; Bhattacharjee, S.

doi:10.1016/j.matchar.2009.02.003

Cited by 30 publications

(18 citation statements)

References 11 publications

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“…18 At the end of the process, the formed tube wall (consisting of metal (hydr)oxides and silica(te)) 5 separates an inner volume of acidic metal salt solution from a surrounding, highly alkaline sol of sodium silicate, as illustrated in Figure 1D. In fact, most of the previous studies on silica gardens stopped at this point and analysed the structure and composition of the tubes 19,20 or explored their possible application in fields like catalysis. 21,22 However, in view of the substantial differences in conditions between the environments on both sides of the membrane ( Figure 1D), it is also of particular interest to study the temporal evolution of the chemical gradients created spontaneously in these systems.…”

Section: Introductionmentioning

confidence: 99%

Diffusion and precipitation processes in iron-based silica gardens

Glaab

Rieder

García‐Ruiz

et al. 2016

Phys. Chem. Chem. Phys.

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Silica gardens are tubular structures that form along the interface of multivalent metal salts and alkaline solutions of sodium silicate, driven by a complex interplay of osmotic and buoyant forces together with chemical reaction. They display peculiar plant-like morphologies and thus can be considered as one of the few examples for the spontaneous biomimetic self-ordering of purely inorganic materials. Recently, we could show that silica gardens moreover are highly dynamic systems that remain far from equilibrium for considerable periods of time long after macroscopic growth is completed. Due to initial compartmentalisation, drastic concentration gradients were found to exist across the tube walls, which give rise to noticeable electrochemical potential differences and decay only slowly in a series of coupled diffusion and precipitation processes. In the present work, we extend these studies and investigate the effect of the nature of the used metal cations on the dynamic behaviour of the system. To that end, we have grown single macroscopic silica garden tubes by controlled addition of sodium silicate sol to pellets of iron(ii) and iron(iii) chloride. In the following, the concentrations of ionic species were measured as a function of time on both sides of the formed membranes, while electrochemical potentials and pH were monitored online by immersing the corresponding sensors into the two separated solution reservoirs. At the end of the experiments, the solid tube material was furthermore characterised with respect to composition and microstructure by a combination of ex situ techniques. The collected data are compared to the previously reported case of cobalt-based silica gardens and used to shed light on ion diffusion through the inorganic membranes as well as progressive mineralisation at both surfaces of the tube walls. Our results reveal important differences in the dynamics of the three studied systems, which can be explained based on the acidity of the metal cations and the porosity of the membranes, leading to substantially dissimilar time-dependent solution chemistry as well as distinct final mineral structures. The insight gained in this work may help to better understand the diffusion properties and precipitation patterns in tubular iron (hydr)oxide/silicate structures observed in geological environments and during steel corrosion.

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Section: Introductionmentioning

confidence: 99%

Diffusion and precipitation processes in iron-based silica gardens

Glaab

Rieder

García‐Ruiz

et al. 2016

Phys. Chem. Chem. Phys.

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“…Details on synthesis and characterization of CSPT may be found elsewhere [11]. These tubes were finely crushed before using as adsorbent.…”

Section: Methodsmentioning

confidence: 99%

Investigation on Cu(II) adsorption on cobalt silicate precipitation tube (CSPT) in aqueous medium

Parmar

Chongder

Bandyopadhya

et al. 2011

Journal of Hazardous Materials

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“…Nickel is responsible for cough, dermatitis, nausea, chronic asthma, cancer, leucopoenia and lymphopenia when injected (Rajurkar et al, 2016). There have been a number of techinques to remove heavy metals, including ion exchange (Ostroski et al, 2009) chemical precipitation Parmer et al, 2009;Bakar et al, 2009) membrane filtration (Samandari et al, 2013) and adsorption (Kursunlu et al, 2009;Narayan et al, 2009;Shanmugapriya et al, 2009) of these techniques, adsorption is considered to be one of the most suitable, easy to handle technique having high efficiency and cost effectiveness (Yedula et al, 2011;Monser et al, 2002). This study aims at investigating the utilization of fly ash as an adsorbent to remove lead Pb(II) and Nickel Ni(II) ions from aqueous solution, such as wastewater.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Lead (II) and Nickel (II) from Dilute Aqueous Solution Using Fly ash as a Biosorbent

Safdari¹,

Kaifiyan²

2017

Int.J.Curr.Res.Aca.Rev.

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Article InfoHeavy metals are nonbiodegradable and exist in the environment create a threat to the organism due to their toxic nature removal and recovery of heavy metals from contaminated water is necessary with respect to environmental health and economical considerations. Heavy metals released in waste water from urban and industrial effluents, leakage of sewage pipes, and plumbing fixtures. For this several treatment technologies including adsorption, coagulation, flocculation, precipitation, reverse osmosis, biological process, ionizing, are being used. But many of these technologies are costly when they are used for treating large amounts of water from all of them the adsorption techniques are preferred because of their low cost, high efficiency, ease of operation. Fly ash a waste substance from thermal power plants is found in abundance utilization of fly ash as an adsorbent for the removal of heavy metals it helped reduce the environmental toxic metal burden and increased economic benefit. For this study, various factors affecting the removal of heavy metal ions, such as contact time with the solution, initial pH and adsorbent dose were investigated. The metal ion removal capacities of fly ash increased with increasing pH and a pH value was found to be the optimal pH for maximum metal removal capacity.

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Characterization of cobalt precipitation tube synthesized through “silica garden” route

Cited by 30 publications

References 11 publications

Diffusion and precipitation processes in iron-based silica gardens

Diffusion and precipitation processes in iron-based silica gardens

Investigation on Cu(II) adsorption on cobalt silicate precipitation tube (CSPT) in aqueous medium

Biosorption of Lead (II) and Nickel (II) from Dilute Aqueous Solution Using Fly ash as a Biosorbent

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