Recycling Mg(OH)₂Nanoadsorbent during Treating the Low Concentration of Cr^VI

Abstract

Investigations about how to recycle the deactivated nanomaterials are well-needed. This work was designed to explore the recycling strategy of Mg(OH)(2) nanoadsorbent during treating low concentration of Cr(VI) solution as an example. It was demonstrated that a reversible route between Cr-adsorbed nano-Mg(OH)(2) and Cr-desorbed bulk-MgCO(3) · 3H(2)O can be established by using CO(2) as a phase transformation medium. In each adsorption-desorption cycle, Cr(VI) solution with initial concentration of 10 mg · L(-1) could be enriched over 40 times. An aggregation-induced rapid phase transformation mechanism from nano-Mg(OH)(2) to bulk-MgCO(3) · 3H(2)O was discovered, which was one of the critical factors to ensure the disposing efficiency of this environmental-friendly Cr(VI) disposal system. A pilot-scale experiment was conducted with this strategy to deal with 50 L Cr(VI)-containing simulated industrial wastewater. The enrichment of Cr(VI) and the recycle of nano-Mg(OH)(2) can be successfully achieved simultaneously.

The rheological behavior and stability of Mg(OH)2 aqueous suspensions in the presence of sodium polyacrylate

“…It is also recognized as an excellent material used in wastewater and industrial effluent treatment to absorb heavy metals [6,7] and organic contaminants [8]. Furthermore, the low price and abundant resource make magnesium hydroxide more preferential in many environmental fields compared with sodium hydroxide [9].…”

Mg(OH)2@reduced graphene oxide composite for removal of dyes from water

“…60,61 The recycling of MGC is important for its industrial application. 14,25 So recycling experiments were executed by washing MGC under magnetic stirring with ethanol (10 ml) for 120 min. Using the recycled MGC as the adsorbent for removal of MB (2.0 Â 10 À5 M, 50 ml) from water, the completed removal of MB was obtained within 60 min, which showed that the adsorption ability of MGC was almost retained after use and recycling (Fig.…”

Magnesium hydroxide coagulation performance and floc properties in treating kaolin suspension under high pH

“…Magnesium hydroxide, a nontoxic and environmentally friendly chemical product, is widely used in industrial wastewater treatment [1][2][3]. One of the most attractive characteristics of magnesium hydroxide is that it could be recycled and reused [3].…”

“…One of the most attractive characteristics of magnesium hydroxide is that it could be recycled and reused [3]. The recoverability of magnesium hydroxide may significantly reduce the chemical costs and may effectively reduce the threat to human being.…”