The adsorption of transition metal cations and inorganic anions from aqueous solutions on microdispersed sintered detonation nanodiamond (MSDN) is systematically studied. The selectivity series Fe³⁺ > Al³⁺ > Cu²⁺ > Mn²⁺ > Zn²⁺ > Cd²⁺ > Co²⁺ > Ni²⁺ with maximum adsorption capacity between 2 and 5 µmol g⁻¹ is obtained. It is found that anions may significantly contribute to the adsorption of transition metal cations, so the adsorption of CH₃COO⁻, Cl⁻, B₄O₇ ²⁻, ClO₄ ⁻, I⁻, SO₄ ²⁻, C₂O₄ ²⁻, PO₄ ³⁻ is also studied. For the first time, dominating adsorption of anions over cations is demonstrated for detonation nanodiamond. The maximum anion-exchange capacity of 50–150 µmol g⁻¹ is found for MSDN. Beside of electrostatic interactions, the formation of complexes with hydroxyl groups and interaction with metal impurities contribute to the adsorption of B₄O₇ ²⁻ and PO₄ ³⁻, respectively. Therefore, anion exchange selectivity of MSDN is different from that observed for common anion exchange resins. In all cases, the adsorption on MSDN obeys Langmuir law. The pH effect on the adsorption of SO₄ ²⁻, PO₄ ³⁻ and B₄O₇ ²⁻ is different from that observed for other anions due to specific interactions.

Item Type:	Refereed Article
Keywords:	detonation nanodiamond, adsorption, metal cations, inorganic anions, ion-exchange, surface
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Separation Science
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
Author:	Peristyy, A (Dr Anton Peristyy)
Author:	Paull, B (Professor Brett Paull)
Author:	Nesterenko, PN (Professor Pavel Nesterenko)
ID Code:	107730
Year Published:	2016
Funding Support:	Australian Research Council (DP150102608)
Web of Science® Times Cited:	8
Deposited By:	Chemistry
Deposited On:	2016-03-22
Last Modified:	2017-10-29
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