On the Existence of Hydrotalcite-Like Phases in the Absence of Trivalent Cations

Kamath, P. Vishnu; Therese, Helen Annal; Gopalakrishnan, J.

doi:10.1006/jssc.1996.7144

Cited by 158 publications

(149 citation statements)

References 22 publications

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“…Except the well known polymorphisms, different forms of nickel hydroxide phases such as β bc , (badly crystallized), a short-range structure of nickel hydroxide phases having both α and β phases, α-LDH (layered double hydroxide) and a novel nickel hydroxide phases (neither α nor β) were reported in literature (Jayashree and Kamath 2001;Kamath et al 1997;Rajamathi et al 1997). In Fig.…”

Section: Characterization Of the Precipitatementioning

confidence: 99%

Treatment and Recovery of Nickel Rich Precipitate From Plating Plant Waste/Nikeliavimo Gamyklų Atliekų Apdorojimas Ir Nikelio Išgryninimas/Переработка Отходов И Получение Чистого Никеля На Заводах По Обработке Никеля

Kurama

2009

Journal of Environmental Engineering and Landscape Management

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Abstract. Nowadays, with the environmental regulations becoming more and more stringent and growing pressure on the conservation of mineral resources, recycling has been gaining interest to develop economically-viable refining technology. As the costs of the wastewater disposal increase (especially in the metal finishing industry) more emphasis is being placed on the recovery and recycling of valuable chemicals contained within these streams. In this study, a commercial plating plant filter waste (PPFW) was examined as an alternative source for the recovery of Ni as a nickel rich precipitate. The treatment tests performed by H 2 SO 4 leaching method showed that dissolution amounts of metals such as Ni, Cu, Zn and Cr were affected by leaching time, temperature and acid concentration. Although the dissolution of metallic compounds almost was completed within the one hour of the extraction time, a rapid and higher dissolution amounts of Ni within the first minute of the leaching process (approximately 81% of the total extractable amount of Ni is extracted at the beginning period for 24 °C) indicated that the usage of this waste as a source of Ni has an advantage compared to Ni recovery from natural ores. A kinetic study carried out to clarify the dissolution of Ni, showed that a series of rate controlling steps, both chemical and diffusion reactions, was involved in the observed kinetic. After leaching, the filtered solution was subjected to two stages of controlled precipitation carried out at a pH of about 4-5.5 and about 8 to produce the solids containing non-nickel and nickel respectively. The precipitation test performed by NaOH or MgO showed that almost all of the dissolved Ni ions were seperated from the solution. Based on the XRD and IR analysis, it was found out that a final precipitate, obtained by the use of NaOH, could be characterized as a disordered α-Ni(OH) or as a blend of α and β-Ni(OH) 2 , as for the MgO, the precipitate composed of mainly β-(Ni(OH) 2 ) phase and/or α-(Ni(OH) 2 ) phases.

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Section: Characterization Of the Precipitatementioning

confidence: 99%

Treatment and Recovery of Nickel Rich Precipitate From Plating Plant Waste/Nikeliavimo Gamyklų Atliekų Apdorojimas Ir Nikelio Išgryninimas/Переработка Отходов И Получение Чистого Никеля На Заводах По Обработке Никеля

Kurama

2009

Journal of Environmental Engineering and Landscape Management

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“…The hydroxides of Ni(II) are known to crystallize in two polymorphic modifications known as ␣ and ␤ [1]. While the ␤-form is a stoichiometric phase of the composition Ni(OH) 2 , the ␣-form is an anion containing the hydroxyl-deficient phase of the composition Ni(OH) 2Ϫx (A nϪ ) x/n ⅐yH 2 O where A nϪ ϭ NO 3 Ϫ , Cl Ϫ , AcO Ϫ , SO 4 2Ϫ , CO 3 2Ϫ ; x ϭ 0.1-0.2 and y ϭ 0.6 -1.0 [2][3][4]. Among the hydroxides of Co(II), the only well-known phase is ␤-Co(OH) 2 (PDF 30-443).…”

Section: Introductionmentioning

confidence: 99%

Chemical synthesis of α-cobalt hydroxide

Rajamathi

Kamath

Seshadri

2000

Materials Research Bulletin

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107

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Precipitation reactions using ammonia yield a novel cobalt hydroxide phase that is structurally and compositionally similar to ␣-nickel hydroxide. The use of other synthetic methods yields the well-known ␤-Co(OH) 2 . The slab composition, mode of anion inclusion, and thermal behavior of the hydroxides obtained by ammonia precipitation are similar to those of ␣-nickel hydroxide; however, the materials are poorly ordered. A DIFFaX simulation of the powder X-ray diffraction patterns offers the best visual match with the observed patterns for a 50% stacking disorder and a disc radius between 100 and 1000 Å.

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“…[24][25][26] Ni 2p spectrum of the Co 2 NiO 4 nanosheeets is shown in Figure 2 c. The Ni 2p 3/2 peak at 855.9 and Ni 2p 3/2 peak at 857.4 eV inidcate the coexistence of Ni 2+ and Ni 3+ . [27][28][29] XPS spectrum of O1s in Figure 2 d shows the peak O I at 529.2 eV corresponds to nickel-oxygen bonds while the peak O II at 531.2 eV is ascribed to cobalt-oxygen bonds. [ 24,25,30 ] XPS analysis also show that the atom ratio of Co, Ni and O is 22.9 at%, 11.…”

Section: Resultsmentioning

confidence: 97%

Flexible Cellulose Paper‐based Asymmetrical Thin Film Supercapacitors with High‐Performance for Electrochemical Energy Storage

Feng

Wang

et al. 2014

Adv Funct Materials

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Cellulose paper (CP)‐based asymmetrical thin film supercapacitors (ATFSCs) have been considered to be a novel platform for inexpensive and portable devices as the CP is low‐cost, lightweight, and can be rolled or folded into 3D configurations. However, the low energy density and poor cycle stability are serious bottlenecks for the development of CP‐based ATFSCs. Here, sandwich‐structured graphite/Ni/Co2NiO4‐CP is developed as positive electrode and the graphite/Ni/AC‐CP as negative electrode for flexible and high‐performance ATFSCs. The fabricated graphite/Ni/Co2NiO4‐CP positive electrode shows a superior areal capacitance (734 mF/cm2 at 5 mV/s) and excellent cycling performance with ≈97.6% Csp retention after 15 000 cycles. The fabricated graphite/Ni/AC‐CP negative electrode also exhibits large areal capacitance (180 mF/cm2 at 5 mV/s) and excellent cycling performance with ≈98% Csp retention after 15 000 cycles. The assembled ATFSCs based on the sandwich‐structured graphite/Ni/Co2NiO4‐CP as positive electrode and graphite/Ni/AC‐CP as negative electrode exhibit large volumetric Csp (7.6 F/cm3 at 5 mV/s), high volumetric energy density (2.48 mWh/cm3, 80 Wh/kg), high volumetric power density (0.79 W/cm3, 25.6 kW/kg) and excellent cycle stability (less 4% Csp loss after 20 000 cycles). This study shows an important breakthrough in the design and fabrication of high‐performance and flexible CP‐based electrodes and ATFSCs.

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On the Existence of Hydrotalcite-Like Phases in the Absence of Trivalent Cations

Cited by 158 publications

References 22 publications

Treatment and Recovery of Nickel Rich Precipitate From Plating Plant Waste/Nikeliavimo Gamyklų Atliekų Apdorojimas Ir Nikelio Išgryninimas/Переработка Отходов И Получение Чистого Никеля На Заводах По Обработке Никеля

Treatment and Recovery of Nickel Rich Precipitate From Plating Plant Waste/Nikeliavimo Gamyklų Atliekų Apdorojimas Ir Nikelio Išgryninimas/Переработка Отходов И Получение Чистого Никеля На Заводах По Обработке Никеля

Chemical synthesis of α-cobalt hydroxide

Flexible Cellulose Paper‐based Asymmetrical Thin Film Supercapacitors with High‐Performance for Electrochemical Energy Storage

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