Competitive Sorption of Metal Ions on Titanium Phosphate Sorbent (TiP1) in Fixed-Bed Columns: A Closed-Mine Waters Study

Abstract

Sorption fixed-bed column experiments were performed using a titanium phosphate ion-exchanger composed of −H2PO4 units [TiO­(OH)­(H2PO4)·H2O]. Model mine water containing five divalent metal ions (Cu2+, Zn2+, Mn2+, Ni2+, and Co2+) and a few closed-mine water samples were treated to evaluate the sorption preference of the material. For the first time, dynamic ion-exchange capacities (estimated to be between 3.2 and 4.2 mequiv g–1) and static ion-exchange uptakes (calculated to be between 3.1 and 3.5 mequiv g–1) were obtained for the same TiP1 sorbent and data were discussed in terms of sorption behavior. It was found that sorption processes on TiP1 in model and closed-mine waters during a column experiment could be accurately predicted from the corresponding batch experiment (including the sorbent’s capacities in different types of waters). A competitive sorption phenomenon in favor of Cu2+ on TiP1 was established for all cases, pointing toward the possibility of isolating pure copper concentrate from closed-mine waters. The relatively high amounts of calcium and magnesium ions present in mine waters did not appear to considerably affect the selectivity of TiP1 material. Exploratory experiments for sorbent regeneration and desorption using a low concentration of nitric acid were demonstrated.

In situ Functionalized Mesoporous Silicas for Sustainable Remediation Strategies in Removal of Inorganic Pollutants from Contaminated Environmental Water

“…Although adsorption technologies are well established, a significant limitation is posed by the cost of the adsorbent materials. Many kinds of adsorbents for heavy metals' removal have been studied, such as activated carbons, 9 T h i s c o n t e n t i s various nanomaterials, 10 including iron-based metal oxides, 11 metal-organic frameworks, 12 polymeric and biomass-based materials, 13 metal phosphates, 14 etc. Compared to them, oxide-based mineral matrices possess a number of advantages.…”

Valorisation options for Zn and Cu recovery from metal influenced acid mine waters through selective precipitation and ion-exchange processes: promotion of on-site/off-site management options

“…However, for comparison purposes, a literature search has been conducted on other materials. Trublet et al (2019) synthetized a titanium phosphate ion-exchanger composed of -H 2 PO 4 units [TiO(OH)(H 2 PO 4 )⋅H 2 O] to evaluate the sorption of five divalent metal ions (Cu(II), Zn(II), Mn(II), Ni(II) and Co(II)) from a model mine water. It was found that the sorption process onto the material was favoured for copper, in comparison with the other studied cations.…”

“…Consequently, sorption (Buenaño et al, 2017;Laus et al, 2007;Trublet et al, 2019;Zhang, 2011) and IX processes (Felipe et al, 2020;Karan et al, 2019), as well as membrane technology, are potential management options for the recovery and purification of valuable metals (López et al 2018;López et al, 2019bLópez et al, , 2020, acids (López et al, 2019b;Nleya et al, 2016) and water reuse (Agboola, 2019;García et al, 2014;Timofeev et al, 2019). Adsorption processes provide flexibility in design and simple operation, and usually produce high-quality treated effluent; for that, it is recognized nowadays as an effective and economic method.…”

Preparation of Adsorbent Based on Polyacrylate Latex Solid Waste and Its Application in the Treatment of Dye Wastewater

“…In addition, compared with polyamine polyacrylamide ion-exchange resin, polyacrylate latex resins used for water-based coatings and inks generally have a lower cross-linking degree; therefore, ion-exchange resins prepared by them usually have a high swelling degree . It is well-known that an adsorbent with a higher swelling degree applied to a fixed-bed column will cause high column pressure and make the fixed-bed column unable to operate. − For this case, a filter aid is usually mixed into the adsorbent to solve the problem of high column pressure.…”