Adsorption Behavior of Quaternary Amine Types of Lignophenol Compounds for Some Precious Metals

Selective recovery of gold by simultaneous adsorption–reduction using microalgal residues generated from biofuel conversion processes

“…In a previous study, lignophenol gels were found to perform reductive adsorption of Au(III), which results in high selectivity for Au(III) 17–19. The formation of metallic Au was also observed in this study by using the crosslinked microalgae.…”

“…However, in order to improve biomass properties such as loading capacity, stability, and selectivity for potential use, chemical treatment is needed to produce a unique adsorbent for target metal ions. In previous work, lignophenol compounds and their derivatives, prepared from lignocellulosic biomass wastes, were found to show high affinity and selectivity for precious metals such as Au(III), Pd(II), and Pt(IV); the polyphenolic and immobilized amine groups played a role in these properties 17–19. The objective of this study is to establish a highly effective adsorbent for gold recovery together with a new high‐value‐added use of microalgal residues.…”

Solid‐phase extraction in the determination of gold, palladium, and platinum

“…Total recovery of Au(III) from industrial solutions (hydrochloric medium) has been achieved by using selective sorption on cross‐linked lignophenol []. By immobilization of amines onto cross‐linked lignophenol, selective adsorption of all Au(III), Pd(II), and Pt(IV) from industrial solutions could be ensured [].…”

Effective recovery of some precious metals by using alternative quaternary amine types of anion-exchangers prepared from biofuel-extracted microalgal residues

“…This immobilized nitrogen moiety on the microalgal residue is expected to play an important role in binding with precious metals like PdCl 4 22 and PtCl 6 22 . 16 Fig. 2 shows the SEM images of TMA-microalgae and TEAmicroalgae.…”

“…[10][11][12][13][14][15] In our previous study, we developed some strongly basic adsorbents by immobilizing quaternary amine functional groups onto polymer matrices of lignophenol, which was prepared by interacting phenol with lignin in wood waste. 16 These were found to be effective for adsorption of Pd(II) and Pt(IV) in hydrochloric acid solution. In this work, two types of strong base anionic adsorbents have been prepared from the residual waste of Pseudochoricystis ellipsoidea, which was generated in the extraction process of biofuel, by chemical modification with trimethylamine and triethylamine.…”