Anion effect on the control of morphology for NiC2O4·2H2O nanostructures as precursors for synthesis of Ni(OH)2 and NiO nanostructures and their application for removing heavy metal ions of cadmium(ii) and lead(ii)

Abstract

In this work, one-dimensional (1-D) and three-dimensional (3-D) nickel oxalate dihydrate nanostructures have been selectively prepared by a one-step and surfactant-free solvothermal approach. This preparation procedure can control the product morphology by varying the reaction temperature and anions such as nitrates, acetates, chlorides and sulfates. The morphology of nickel oxalate dihydrate changed from non-uniform sheets and ribbons to nanorods with higher temperatures while changing the initial anion converted nanorods to dandelion-like nanostructures. Field emission scanning electron microscopy (FESEM) shows that the sizes of the nickel oxalate dihydrate nanorods are about 3 μm in length and the dandelion-like nanostructures have an average diameter of around 10 μm. Furthermore, the adsorption of the heavy metal ions of cadmium(ii) and lead(ii) with nanostructured nickel compounds was investigated. The results indicate the NiO and Ni(OH)2 nanostructures can effectively adsorb cadmium(ii) and lead(ii) ions from aqueous solution.

Highly porous Co-doped NiO nanorods: facile hydrothermal synthesis and electrocatalytic oxygen evolution properties

“…In addition, the absorption bands at 1317 cm −1 and 829 cm −1 were assigned to the C–O and C–C stretching vibrations of coordinated oxalic acid, respectively [ 38 ]. The Ni–O bending of oxalate moiety was assigned to the absorption band at about 491 cm −1 [ 39 ]. The FTIR spectra of 6%Co-NiC 2 O 4 and 7%Co-NiC 2 O 4 showed similar features to that of NiC 2 O 4 (electronic supplementary material, figure S6(b)), excepting slight shifts were observed for the symmetric C=O, C–O, C–C and Ni–O bending vibration bands.…”

Facile preparation of Ag/Ni(OH)2 composites with enhanced catalytic activity for reduction of 4-nitrophenol

“…Taking into account that the nickel hydroxide is a moderately strong bases and has excellent adsorption abilities to heavy metal ions. 13 The asprepared Ni(OH) 2 was used to adsorb silver ions and it had a relatively large adsorption capacity of 37.5 mg g À1 . Therefore, we can conclude the formation mechanism of the Ag/Ni(OH) 2 composite is as follows.…”

“…[8][9][10][11] Nickel hydroxide (Ni(OH) 2 ), one of the most important transition metal hydroxides, has been intensively studied and widely used in storage batteries, electroplating and catalyst support. [12][13][14] Numerous methods like hydrothermal and solvothermal methods, precipitation, sol-gel method have been employed for synthesis of Ni(OH) 2 with various shapes, such as nanosheets, nanoparticles, nanoribbons, nanospheres, etc. 15 Zhen et al had fabricated Pd x -Pt 1Àx /Ni(OH) 2 hybrids by mixing L-arginine modied Ni(OH) 2 nanosheets and PVP stabilized Pd x Pt 1Àx nanoparticles for the reduction of 4-NP.…”

Morphology‐Conserved Transformations of Metal‐Based Precursors to Hierarchically Porous Micro‐/Nanostructures for Electrochemical Energy Conversion and Storage

“…The hydrolysis of diethyl oxalate can also be used to produce metal‐oxalate precursors. For example, Fatemeh et al synthesized nickel oxalate nanostructures via reaction of nickel salts and diethyl oxalate in ethanol solution. By controlling the heat treatment and reaction conditions, the NiC 2 O 4 precursor could be converted into dandelion‐like and rod‐like NiO nanostructures.…”