Physico-chemical treatment techniques for wastewater laden with heavy metals

This paper presents a review of the redox and electrocatalytic properties of transition metal oxide electrodes, paying particular attention to the oxygen evolution reaction. Metal oxide materials may be prepared using a variety of methods, resulting in a diverse range of redox and electrocatalytic properties. Here we describe the most common synthetic routes and the important factors relevant to their preparation. The redox and electrocatalytic properties of the resulting oxide layers are ascribed to the presence of extended networks of hydrated surface bound oxymetal complexes termed surfaquo groups. This interpretation presents a possible unifying concept in water oxidation catalysis – bridging the fields of heterogeneous electrocatalysis and homogeneous molecular catalysis.

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Redox and electrochemical water splitting catalytic properties of hydrated metal oxide modified electrodes

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal.

Nickel hydroxide has received increased attention especially due to its electrochemical properties and potential applications in rechargeable Ni-base alkaline batteries, e.g., Ni/Cd, Ni/Zn, and Ni/MH. Ni(OH)2 has a hexagonal layered structure with two polymorphs, α- and β-Ni(OH)2. α-Ni(OH)2 shows superior electrochemical properties compared to those of the β-form. Nanosized flowerlike α-nickel hydroxide materials with an interlayer spacing of 7.0 A have been prepared by a microwave-assisted hydrothermal method. The experimental results from XRD and FT-IR showed that the Ni(OH)2 sample prepared by this method had the typical α-phase. FE-SEM images showed many uniform flowerlike architectures with diameters of 700 nm−1µm which consisted of the aggregated flakes. TEM results showed the flakes were built up from many nanocrystals with 2–3 nm diameters. TGA and TPD were employed to investigate thermal stability and gas evolution during the heating process. α-Nickel hydroxide was transferred to NiO with a cubic...

3D Flowerlike α-Nickel Hydroxide with Enhanced Electrochemical Activity Synthesized by Microwave-Assisted Hydrothermal Method

Recent advances in supported liquid membrane technology

Extraction studies of cobalt (II) and nickel (II) from chloride solutions using Na-Cyanex 272.: Separation of Co(II)/Ni(II) by the sodium salts of D2EHPA, PC88A and Cyanex 272 and their mixtures

R.P. Das

Papers

Extraction studies of cobalt (II) and nickel (II) from chloride solutions using Na-Cyanex 272.: Separation of Co(II)/Ni(II) by the sodium salts of D2EHPA, PC88A and Cyanex 272 and their mixtures

Leaching of manganese nodules in ammoniacal medium using glucose as reductant

Removal/recovery of hydrochloric acid using Alamine 336, Aliquat 336, TBP and Cyanex 923

Electrochemical precipitation of nickel hydroxide

Leaching of manganese nodules at elevated temperature and pressure in the presence of oxygen