Pyrite-DTPI interaction as a function of pulp potential and pH

Hicyilmaz, C
Altun, Naci Emre
Ekmekci, Z
Gokagac, G
This study aims to investigate the nature of interactions between pyrite and sodium diisobutyldithiophosphinate (DTPI), a dithiophospinate type collector, with respect to the pulp potential (Eh), and pH. Cyclic voltammetry (CV) technique was employed at certain potential ranges and slightly acidic, neutral and alkaline solutions in order to identify the electrochemical behaviour of pyrite and DTPI individually, as well as the possible mutual reactions occurring among pyrite surface and DTPI. In addition, the change in the hydrophobicity of the pyrite surface was also evaluated in the absence and presence of DTPI as a function of Eh and pH through electrochemical contact angle measurements. These two phases were complemented by DRIFT spectroscopy analysis with polarized and DTPI induced pyrite samples at various potential values so as to determine the origin of species forming on pyrite surface. At the end of the study, all these three distinct methods indicated that the adsorption of DTPI on the pyrite surface relied on chemical mechanisms rather than an electrochemical interaction.


Electrochemical Behavior Pyrite in the Absence and Presence of DTPI at Acidic and Alkaline Conditions
Hiçyılmaz, C; Altun, Naci Emre; Ekmekçi, Zafir; Gökağaç Arslan, Gülsün (null; 2006-09-01)
This study investigates the electrochemical behavior of pyrite in collectorless and DTPI (sodium disobuthyldithiophosphinate) induced conditions to identify the nature of interactions between pyrite and DTPI with respect to pulp pH and pulp potential (Eh). Electrochemical investigation from acidic to alkaline (pH = 4.67- 11.0) conditions were performed using cyclic voltammetry technique in cathodic to anodic potential range (-505 to +595 mV SHE). DRIFT spectroscopy were also done after polarization at varyi...
Cobalt Metallopeptide Electrocatalyst for the Selective Reduction of Nitrite to Ammonium
Guo, Yixing; Stroka, Jesse R.; Kandemir, Banu; Dickerson, Claire E.; Bren, Kara L. (American Chemical Society (ACS), 2018-12-12)
A cobalt-tripeptide complex (CoGGH) is developed as an electrocatalyst for the selective six-electron, eight-proton reduction of nitrite to ammonium in aqueous buffer near neutral pH. The onset potential for nitrite reduction occurs at -0.65 V vs Ag/AgCl (1 M KCl). Controlled potential electrolysis at -0.90 V generates ammonium with a faradaic efficiency of 90 +/- 3% and a turnover number of 3550 +/- 420 over 5.5 h. CoGGH also catalyzes the reduction of the proposed intermediates nitric oxide and hydroxylam...
JELINEK, R; Özkar, Saim; PASTORE, HO; MALEK, A; OZIN, GA (American Chemical Society (ACS), 1993-01-01)
Na-23 double-rotation NMR (DOR) provides site-specific structural and dynamical information on guest-host interactions within sodium zeolite Y pores. Quantitative adsorption of H2O, PMe3, and Mo(CO)6 guests affects both the positions and line shapes of the N-23 resonances from specific extraframework Na+ sites. The evolution of the Na-23 DOR spectra with the progressive introduction of guest molecules allows one to probe direct ''solvation'' effects involving the Na+ cations in the larger supercages, as wel...
Radiation grafting of various water-soluble monomers on ultra-high molecular weight polyethylene powder: Part I. Grafting conditions and grafting yield
Aydinli, B; Tincer, T (Elsevier BV, 2001-02-01)
Monomers of some water-soluble polymers; acrylic acid, methacrylic acid, acrylamide, N, N-dimethyl acrylamide and 1-vinyl-2 pyrrolidone, were grafted on ultra-high molecular weight polyethylene (UHMWPE) powders by a direct grafting method in an aqueous medium in air. Inhibition of homopolymerisation was achieved by adding various concentrations of Fe2+ or Cu2+ ions. It was found that the degree of grafting increases linearly with dose till a gelation state is reached, and varies between 40 and 12% depending...
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Ozdemir, Tonguc; Usanmaz, Ali (Elsevier BV, 2008-06-01)
In this study, radiation stability of poly(bisphenol-a-epichloroliydrin) (PBEH) was studied via gamma irradiations at two different dose rates of 1540 and 82.8 Gy/h, in order to understand the possible use of PBEH in radioactive waste management as a solidifying agent. The total dose of irradiation was up to 2150kGy. Degradation nature was tested by studying the changes in mechanical and thermal properties with the change of dose rate and total dose of irradiation. Tensile strength at yield was increased fi...
Citation Formats
C. Hicyilmaz, N. E. Altun, Z. Ekmekci, and G. Gokagac, “Pyrite-DTPI interaction as a function of pulp potential and pH,” COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, pp. 11–24, 2004, Accessed: 00, 2020. [Online]. Available: