Arsenic poisoning constitutes a major threat to humans, causing various health problems. Almost everywhere across the world certain “hotspots” have been detected, putting in danger local populations, due potential consumption of water or food contaminated with elevated concentrations arsenic. According relevant studies, Asia shows highest percentage significantly sites, followed by North America, Europe, Africa, South America and Oceania. The presence arsenic ecosystems can originate from...

Due to their unique properties, i.e., fluoroscopy response and inertness, noble metals alloys are present in several widespread medical–technological products, such as catheters, guide-wires, stents. Despite value, these products serve single-use consumables, following a fate of solid waste disposal loss valuable metals. This work studies the development treatment methodology recover Pt, Ir, Au, Ta from certain commercial commonly used for medical practices. In particular, sequence...

This study evaluates the efficiency of iron-based oxy-hydroxides to remove antimony from groundwater meet requirements drinking water regulations. Results obtained by batch adsorption experiments indicated that qualified iron oxy-hydroxide (FeOOH), synthesized at pH 4 for maintaining a high positive charge density (2.5 mmol OH−/g) achieved residual concentration Sb(III) below EU regulation limit 5 μg/L providing an capacity 3.1 mg/g. is more than twice greater compared either similar...

In this study, single iron oxyhydroxides (FeOOH) and binary iron/manganese (FeMnOOH) were used to serve as potential mercury adsorbents. The selection of the optimum adsorbent corresponding conditions synthesis was based not only on its maximum Hg(II) adsorption capacity but also ability achieve health regulation limit for drinking water in National Sanitation Foundation challenge matrix. experimental results revealed improved Hg by FeMnOOH compared FeOOH. addition, parameters FeMnOOH, pH,...

Chromite is formed in nature ophiolitic layers and ultrabasic rocks through fractional crystallization. The corresponding mining technologies separate the ore from these rocks, which are considered to be tailings for process but may valorized other applications. need utilize this material due large quantities of its production special management required avoid possible secondary pollution. In present work, chromite were applied acid mine drainage (AMD) neutralization. aim was increase...

Tanneries produce significant quantities of hazardous waste/waters and, according to international environmental organizations, their further recycling/reuse/exploitation in the context circular economy is considered mandatory. A relevant case study recovery Cr(III), used large amounts during tanning process, which can be recovered from corresponding industrial waste/sludge. The aim this work optimize Cr(III) hydrometallurgical tannery sludge by examining major experimental conditions that...

The surface configuration of tetravalent manganese feroxyhyte (TMFx) was appropriately modified to achieve higher negative charge density and, hence, improve its efficiency for the removal dissolved Cd and Pb mostly cationic species from water at pH values commonly found in or ground waters. This succeeded by favorable engagement Ca2+ cations onto a mixed Mn-Fe oxy-hydroxide adsorbent during preparation step, imitating an ion-exchange mechanism between H+ Ca2+; therefore, number available...

Mercury is a highly toxic pollutant of major public health concern, and human exposure mainly related to the aqueous phase, where its dominant form methyl-mercury (MeHg). In current work, two carbon-based adsorbents, i.e., commercial activated carbon sunflower seeds’ biochar, were modified by introduction thiol-active groups onto their surfaces for MeHg removal from natural-like water in ppb concentration levels. The examined thiol-functionalization was two-step process, since raw materials...

A combination of thermal (500–750 °C in air) and hydrometallurgical (acidic) treatments have been applied to dried tannery sludge, resulting the initial conversion Cr(III) Cr(VI) its subsequent leaching as wastewater with high concentration content (3000–6000 mg/L), presenting an extraction efficiency over 90%. The optimal electrochemical conditions for reduction respect acid kind were established by applying appropriate rotating disc electrode (RDE) experiments, using a glassy carbon (GC)...

A magnetic nanocomposite, consisting of Fe3O4 nanoparticles embedded into a Mg/Al layered double hydroxide (LDH) matrix, was developed for cancer multimodal therapy, based on the combination local hyperthermia and thermally induced drug delivery. The synthesis procedure involves sequential hydrolysis iron salts (Fe2+, Fe3+) Mg2+/Al3+ nitrates in carbonate-rich mild alkaline environment followed by loading 5-fluorouracil, an anionic anticancer drug, interlayer LDH space. Magnetite with...

Noble metals (Pt, Ir, Au, Ta, etc.) have found several applications in specific medical technology products since they present inertness and visibility when examined via fluoroscopy by an external observer/operator. These are usually applied as single-use materials and, a result, the corresponding waste streams may be quite rich valuable metals. In this work, it was proven that noble can recovered from such streams. Initially, pyrolysis completely remove plastic covering of products....

Chromite ore occurs mainly in ophiolitic mineral complexes and within ultrabasic rocks. As a result, the mining enrichment processes applied to this lead production of large amounts rocks, considered be waste stream. These wastes are various structures olivine serpentine (i.e., hydrous olivine). The rocks may by-product process, following framework circular economy, but presence degrades their quality. In work, it was proven that thermal treatment rock samples eliminate content.

The effluent of tanneries is a hazardous waste and combination physical-chemical biological techniques required for its treatment. As result the previous processes, sludge with high chromium content produced. So, aim this study hydrometallurgical recovery in context circular economy. According to chemical characterization, only form metal that existed was trivalent, while up 14.8% w/w. Among examined acids, highest efficiency Cr(III) leaching achieved by H2SO4 (93%), due formation soluble...

Developing an efficient recycling route for spent single-use medical devices is essential recovering precious metals. The proposed complete hydrometallurgical goes through the initial pyrolysis and acid digestion steps, expanding upon our previous relevant work in field, followed by solvent extraction, stripping, precipitation procedures. In this study, a process was developed recovery of gold, platinum, iridium, tantalum, separating them from other metals, i.e., iron, chromium, nickel, also...