Abstract
In this study, Diphonix resin containing sulfonic, diphosphonic and carboxylic groups was used to evaluate the adsorption capacity of metal ions contained in the nickel-metal hydride batteries (Ni-MH). This type of ion exchanger can be considered as the multifunctional material having great affinity to many metal ions. Using Diphonix resin adsorption process was carried out for La(III) and Ni(II) ions to characterize kinetic, adsorption and thermodynamic parameters. Preliminary studies of the Nd(III), Ce(III), La(III), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) metal ions mixture were also performed. The best results of adsorption studies were obtained using 0.2 M HNO3. Diphonix resin exhibits especially good adsorptive properties with respect to rare earth element ions (adsorption efficiency of about 100%) in comparison with the heavy metal ions in the second oxidation state (about 50% or below). The series of affinity of the resin for the studied ions can be presented as follows: La(III) > Fe(III) > Nd(III) > Ce(III) > Cu(II) > Zn(II) > Co(II) > Ni(II). The obtained results confirmed the possibility of further use of the resin for the recovery and separation of rare earth elements from solutions after Ni-MH batteries leaching.
Highlights
Nowadays development of technology as well as production of various portable electrical devices results in creation of large amounts of wastes (Bertuol et al 2009; Müller and Friedrich 2006; Pietrelli et al 2005; Skowroński et al 2015)
The spent batteries impose serious threat for the natural environment as they contain many dangerous substances, among others, heavy metals (HM). They constitute a source of valuable metals including rare earth elements (REEs)
The aim of the paper was to study possibilities of recovery of metal ions contained in the nickel-metal hydride (Ni-MH) cells through their adsorption on the commercially available Diphonix resin
Summary
Nowadays development of technology as well as production of various portable electrical devices results in creation of large amounts of wastes (Bertuol et al 2009; Müller and Friedrich 2006; Pietrelli et al 2005; Skowroński et al 2015). All European Union countries are obliged to undertake the actions ensuring a selective collection and recycling of spent galvanic cells including commonly known as batteries or accumulators. Such activities follow some legal regulations (among others, the previous—93/86/ EEC, 98/101/EC, 2006/66/WE PE and Council and present 2012/19/UE about batteries and accumulators as well as their wastes). Of significant importance is suitable recycling of such materials which is based on elimination of threat as a result of harmful elements content and on recovery of valuable metals as a secondary raw material (Ekberg and Petranikova 2015; Müller and Friedrich 2006; Pietrelli et al 2005, 2002)
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