Halide removal from water using silver doped magnetic-microparticles.

Area of Science:

• Environmental Science
• Materials Science
• Analytical Chemistry

Background:

• Bromide and chloride ions in drinking water pose health and aesthetic concerns.
• Existing water treatment methods for halide removal can be inefficient or costly.
• Development of novel materials for effective halide remediation is crucial.

Purpose of the Study:

• To develop and evaluate core-shell magnetic microparticles with Ag(0) (Ag(0)-MPs) for bromide and chloride removal from water.
• To investigate the mechanism of halide removal using Ag(0)-MPs and hydrogen peroxide.
• To assess the influence of operational parameters on the removal efficiency.

Main Methods:

• Synthesis of core-shell magnetic microparticles functionalized with Ag(0).
• Oxidation of Ag(0)-MPs to Ag(I)-MPs using hydrogen peroxide for halide precipitation.
• Characterization of materials using SEM, XPS, and microanalysis.
• Quantification of bromide and chloride ions using ion-selective electrodes (ISEs).

Main Results:

• Ag(0)-MPs effectively remove bromide and chloride ions by forming silver halides (AgCl, AgBr).
• Optimal removal efficiency achieved at pH 7, with up to 67.01% Br- and 56.92% Cl- removal.
• Removal efficiency is consistent across a pH range of 3.5-7.
• Tannic acid (organic matter surrogate) and Cl- concentration showed influence on Br- removal.

Conclusions:

• The Ag-MPs/H2O2 system is a viable technology for removing bromide and chloride from drinking water.
• The magnetic nature of the particles allows for easy separation and potential reusability.
• Further research can optimize regeneration and application for large-scale water treatment.