Removal of Ni(II) from electroplating rinse waters using cation-exchange resins: batch and column studies

The adsorption of Ni (II) from nickel electro plating rinse water has been attempted. Indion 225 and Dueolite C 20 cation-exchange resins through batch and column mode for the recovery of Ni (II), which showed a remarkable increase in sorption capacity. On the basis of isotherm analysis; more efficient adsorbent is chosen for column mode adsorption studies. The continuous-flow study was to investigate the effect of various process variables, like bed height, hydraulic loading rate on breakthrough and adsorption capacity. An attempt has also been made the data using Bohart–Adams approach to design the adsorption system

Recovery of Nickel (I) Ions from Electroplating Rinse Water Using Hectorite Clay

This paper describes the recovery of Ni (II) from electroplating rinse water using the Hectorite clay. Batch mode adsorption experiments were carried out and the effect of contact time, adsorbent dosage, pH, initial metal ion concentration and temperature were studied. Different isotherms were obtained using nickel electroplating rinse waters of various concentrations. The ion exchange process follows second order kinetics and langmuir isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy and enthalpy for the ion-exchange of Ni (II) from electroplating rinse water on Hectorite clay, revealed that the ion-exchange process was spontaneous and exothermic under different temperatures. The maximum adsorption capacity obtained was 62.24 mg/g at pH 7-8, the optimum adsorbent dosage and contact time was found to be 2 g/l within 5hours

Cardanol-based benzoxazine-terminated graphene oxide-reinforced fluorinated benzoxazine hybrid composites for low K applications

A novel fluorinated benzoxazine was prepared from bisphenol-AF, aniline and paraformaldehyde and was characterized by 1H NMR, 19F NMR and FTIR. A benzoxazine-functionalized silane-coupling agent was synthesized using renewable resource cardanol, paraformaldehyde and aminopropyltriethoxysilane (APTES). Cardanol benzoxazine-functionalized graphene oxide (GO-C-aps)-reinforced fluorinated benzoxazine (BAF-a) hybrid composites poly(GO-BAF-a) have been developed through the facile one step copolymerization route. XRD and SEM analyses were used to ascertain the morphology of the composite materials developed. Data obtained from thermal, dielectric and surface studies infer that the hybrid cardanol-based benzoxazine composites possess the enhanced thermal stability, improved hydrophobic behaviour with lower value of dielectric constant according to the weight percentage concentration of functionalized graphene oxide than those of neat benzoxazine matrix. The hybrid cardanol benzoxazine composites developed in the present work can find application in the form of coatings, sealants and adhesives for interlayer low k dielectric insulation applications in microelectronics industries.</p