Scalable and sustainable process of spike spherical Mg(OH)2 adsorbent from magnesite by ammonia-cycle method for dye removal.

ABSTRACT: This study presents an innovative, and environmentally friendly synthesis process for spike spherical magnesium hydroxide (SSMH) using magnesite and an ammonia-cycle method, which eliminates waste liquid, gas, and chemical reagent pollution. The process involves calcining magnesite to obtain calcined magnesite, which reacts with (NH4)2SO4 to produce magnesium sulfate and ammonia. Subsequently, magnesium sulfate reacts with ammonia water to generate SSMH. The optimized conditions for the extraction of magnesium ion (Mg²⁺) are as follows: (NH4)2SO4 concentration of 2.4 mol/L, 4 g of calcined magnesite powder, and a reaction time of 1.5 h, resulting in an extraction rate of Mg²⁺ of 93.4%. The optimized conditions for the precipitation of Mg² ⁺ are as follows: Mg² ⁺ concentration of 0.7-1.3 mo

SUBMITTER: Duan X 

PROVIDER: S-EPMC12440167 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature