https://vital.seals.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://vital.seals.ac.za/vital/access/manager/Repository/vital:28749 Wed 12 May 2021 20:27:06 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:21340 Wed 12 May 2021 20:04:36 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:2091 Wed 12 May 2021 19:05:22 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:4538 Wed 12 May 2021 19:02:23 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:11663 Wed 12 May 2021 18:33:34 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:20695 Wed 12 May 2021 18:14:25 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:20632 Wed 12 May 2021 17:57:06 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:1260 Wed 12 May 2021 16:42:32 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:4281 Ni²⁺ > Zn²⁺ > Cd²⁺> Co²⁺ was achieved as a function of pH. At pH 1.65 the extracted copper, from a synthetic mixture of the base metals reached 90.13(±0.90)%, and through a two-step extraction process 98.22(±0.29)% copper was recovered with negligible nickel and cobalt impurities. Stripping of the copper from the loaded organic phase using TraceSelect sulphuric acid at pH 0.35 yielded 96.60(±0.44)% of the loaded quantity after the second stage of stripping. The separation of Ni²⁺ from the borderline and hard acids; Co²⁺, Cu²⁺, Zn²⁺, Fe2²⁺, Fe²⁺, Mn²⁺, Mg2²⁺ and Ca²⁺ at a pH range of 0.5-3.5 with OPIM and DNNSA was acvieved to the tune of a ΔpH½≈ 1.6 with respect to cobalt from a sulfate and sulfate/chloride media. A three-stage counter-current extraction of Ni²⁺, at the optimized pH of 1.89, from a synthetic mixture of Ni²⁺, Co²⁺ and Cu²⁺, yielded 99.01(±1.79)%. The total co-extracted Cu²⁺ was 48.72(±0.24)% of the original quantity in the mixture, and it was 19.85(±0.28%) for Co²⁺. The co-extracted Cu²⁺ was scrubbed off from the loaded organic phase at pH≈8.5 by using an ammonium buffer, while co-extracted Co²⁺ was selectively and quantitatively stripped with H₂SO₄ at pH 1.64. The total recovery of Ni²⁺ by stripping at pH 0.32 was 94.05(±1.70)%. In the solid-liquid system, Ni²⁺ was separated from Co²⁺, Cu²⁺, and Fe²⁺ with the microspherical resins funtionalised with 2,2′-pyridylimidazole by a separation factor (β) in the range 22-45. Electrospun nanofibers as sorbents yielded high sorption capacity in the range of 0.97 - 1.45 mmol.g⁻¹ for the same metals ions. Thus, 1-octylimidazole-2-aldoxime (OIMOX), and1-octyl-2-(2′-pyridyl)imidazole (OPIM) can be effectively utilized alongside DNNSA as a co-extractant in the separation of Cu²⁺ and Ni²⁺ respectively from base metals in acidic sulfate medium in a solvent extraction process, and the latter as a selective ligand in the solid-liquid separation of Ni²⁺ from Co²⁺, Cu²⁺, and Fe²⁺.]]> Wed 12 May 2021 16:26:16 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:40606 Wed 12 May 2021 14:20:28 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:3562 Thu 13 May 2021 10:44:01 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:1584 Thu 13 May 2021 05:50:32 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:3896 Thu 13 May 2021 03:24:36 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:3794 Thu 13 May 2021 01:13:56 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:29593 Thu 13 May 2021 01:07:24 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:4659 Thu 13 May 2021 00:55:24 SAST ]]> https://vital.seals.ac.za/vital/access/manager/Repository/vital:11311 Thu 13 May 2021 00:03:33 SAST ]]>