Controllable synthesis of uniform small-sized MgCO3 from Mg2+ concentrated seawater brine for the preparation of epoxy resin composite and high purity MgO
Source abstract
Abstract
The large and uneven grain size of anhydrous magnesium carbonate (MgCO 3) seriously restricts its application ranges and performances. In this study, we proposed a controllable and cost-effective strategy to synthesize uniform small-sized MgCO 3 from Mg 2+ concentrated seawater brine in the absence of crystal modifiers. In this process, solid NaOH was directly added to Mg 2+ concentrated seawater brine to completely and rapidly convert Mg 2+ to magnesium hydroxide (Mg(OH) 2) nanoparticles. These nanoparticles are redispersed in water to form the colloidal system, where Mg(OH) 2 nanoparticles hydrothermally reacts with urea to obtain uniform small-sized MgCO 3 particles. The influence of reaction temperature, reaction time, and the molar ratio of magnesium ions to urea on the synthesis of MgCO 3 is systematically investigated. In the highly-dispersed and stable colloidal system, Mg(OH) 2 nanoparticles could exert an effective and sustained retarding effect on the hydrolysis rate of urea by attracting free water, resulting in the controllable release of NH 4 +, CO 3 2−, and Mg 2+. This study presents a simple route to realize the controllable synthesis of uniform small-sized MgCO 3 particles, and demonstrates the feasibility of using MgCO 3 as an ideal filler for enhancing the performance of polymers as well as an ideal precursor for high-purity MgO production.
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Research context
OpenAlex topics: Polymer Nanocomposites and Properties · Magnesium Oxide Properties and Applications · Silicone and Siloxane Chemistry
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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