Adsorption recovery of Ag(I) and Au(III) from an electronics industry wastewater on a clay mineral composite

Rakhila, Youness; Elmchaouri, Abdellah; Mestari, Allal; Korili, S.A.; Abouri, Meriem; Gil, Antonio

doi:10.1007/s12613-019-1777-x

Cited by 28 publications

(14 citation statements)

References 33 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, how the cations affect the adsorption performance of the ionic polymers is vital but unresolved. Various adsorbents for Au(III) adsorption reported are summarized in Table . ,− CMPS-triethylammonium has a good performance, which implies that it has a good practicality to recover Au(III).…”

Section: Resultsmentioning

confidence: 99%

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Kou

Pan

et al. 2022

Langmuir

View full text Add to dashboard Cite

Ionic polymers have been proven to be promising adsorbents in recovering Au(III) due to their advantages of simple synthesis and high adsorption efficiency. However, the unclarity of the relationship between the adsorption ability of ionic polymers and their cationic structures hinders further optimization of their adsorption performance. This study synthesized a series of ionic polymers with pyridinium, imidazolium, piperidinium, pyrrolidinium, and triethylammonium cations to discover the effects of the cationic structure on their adsorption properties. Experimental results show that the existence of anion−π interaction between aromatic cations and [AuCl 4 ] − makes the aromatic cations−anion interaction stronger, which does not enhance the adsorption performance of the aromatic-based ionic polymer. This is due to the charge delocalization in the aromatic ring, resulting in a lower electrostatic potential (ESP) of aromatic cations than that of aliphatic cations with a localized charge. The higher the ESP of cations, the better the adsorption performance of the corresponding ionic polymer. This study serves as a deep understanding of the cationic structure−adsorptive performance relationship of the ionic polymer at the molecular level and further provides a theoretical guidance to optimize the adsorption performance of ionic polymers.

show abstract

Section: Resultsmentioning

confidence: 99%

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Kou

Pan

et al. 2022

Langmuir

View full text Add to dashboard Cite

show abstract

“…In the presence of both sulfite and thiosulfate at a pH value of 6.0–7.5, the dominant species of Au ions are reported in the form of sulfite and thiosulfate Au complexes as (Au 2 S 2 O 3 )(SO 3 ) 2 . − − As also demonstrated in Figure , neither adsorption nor photocatalytic reduction of Au was observed via WO 3 in the presence of mixed complexing agents for all utilized concentrations. Different concentrations of complexing agents exhibited different behaviors of Au ion adsorption in the TiO 2 system.…”

Section: Results and Discussionmentioning

confidence: 70%

“…The presence of precious metals such as Au in the effluent is an economic loss. Thus, various processes have been developed to recover Au from the discharged solution, such as precipitation, electrolysis, adsorptive reduction, ion exchange, solvent extraction, and bioproduction and biorecovery. , In addition to the mentioned processes, another promising process that can be used to recover Au from the plating bath solution is the photocatalytic process because it possesses the viability to recover Au from aqueous solutions of both chloride species and cyanide species . In addition, it is environmentally friendly, involves low operating costs, and can operate at ambient conditions. , …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

et al. 2022

View full text Add to dashboard Cite

In this work, a photocatalytic process was carried out to recover gold (Au) from the simulated non-cyanide plating bath solution. Effects of semiconductor types (TiO 2 , WO 3 , Nb 2 O 3 , CeO 2 , and Bi 2 O 3 ), initial pH of the solution (3−10), and type of complexing agents (Na 2 S 2 O 3 and Na 2 SO 3 ) and their concentrations (1−4 mM each) on Au recovery were explored. Among all employed semiconductors, TiO 2 exhibited the highest photocatalytic activity to recover Au from the simulated spent plating bath solution both in the absence and presence of complexing agents, in which Au was completely recovered within 15 min at a pH of 6.5. The presence of complexing agents remarkably affected the size of deposited Au on the TiO 2 surface, the localized surface plasmon effect (LSPR) behavior, and the valence band (VB) edge position of the obtained Au/TiO 2 , without a significant change in the textural properties or the band gap energy. The photocatalytic activity of the obtained Au/TiO 2 tested via two photocatalytic processes depended on the common reduction mechanism rather than the textural or optical properties. As a result, the Au/TiO 2 NPs obtained from the proposed recovery process are recommended for use as a photocatalyst for the reactions occurring at the conduction band rather than at the valence band. Notably, they exhibited good stability after the fifth photocatalytic cycle for Au recovery from the actual cyanide plating bath solution.

show abstract

“…As the adsorption process of gold(III) ions followed the pseudo-second-order kinetic model, the rate-determining step for gold(III) ions adsorption would be the surface adsorption onto C-phenylcalix [4]resorcinarene adsorbents. [28,34] This could involve the surface interactions of the hydroxyl and nitro functional groups of C-phenylcalix [4] resorcinarene with gold(III) ions. This adsorption model was also proposed for other metal ion adsorption on carbon nanotube adsorbent.…”

Section: Kinetics and Thermodynamic Studiesmentioning

confidence: 99%

The Role of a Nitro Substituent in C‐Phenylcalix[4]resorcinarenes to Enhance the Adsorption of Gold(III) Ions

2021

View full text Add to dashboard Cite

Nitro-substituted C-phenylcalix [4]resorcinarene derivatives were synthesized and evaluated for gold(III) ions adsorption. All the nitro-substituted C-phenylcalix[4]resorcinarenes showed higher maximum adsorption capacity as compared to the bare C-phenylcalix[4]resorcinarene. A remarkable high adsorption capacity of up to 272.70 mg g À 1 was obtained after 2 h on the C-2-nitrophenylcalix[4]resorcinarene (Calix-2NO 2 ), which was two times higher than that of the C-phenylcalix [4] resorcinarene. The adsorption capacity was affected by the position of the nitro group. The highest adsorption capacity observed on the Calix-2NO 2 was closely related to the strongest supramolecular interactions between the gold(III) ions and the Calix-2NO 2 , as supported by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance ( 1 H-NMR) spectroscopies as well as the desorption study. This study demonstrated that the macrocyclic material, namely nitro-substituted C-phenylcalix[4]resorcinarenes, were effective adsorbents having good reusability, and thus, applicable for gold(III) ions recovery.

show abstract

Adsorption recovery of Ag(I) and Au(III) from an electronics industry wastewater on a clay mineral composite

Cited by 28 publications

References 33 publications

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Photocatalytic Recovery of Gold from a Non-Cyanide Gold Plating Solution as Au Nanoparticle-Decorated Semiconductors

The Role of a Nitro Substituent in C‐Phenylcalix[4]resorcinarenes to Enhance the Adsorption of Gold(III) Ions

Contact Info

Product

Resources

About