Novel silica based adsorbent layer-by-layer modified with polyhexamethylene guanidine and Arsenazo reagents for solid-phase extraction of lanthanides from lignites and products of their processing

Novel silica-based adsorption materials layer-by-layer modified with polyhexamethylene guanidine and Arsenazo I or Arsenazo III have been proposed for solid-phase extraction of rare earth elements (REE). Silica, modified with Arsenazo I, quantitatively extracted REE at pH 5.5 - 7.0, and silica, modified with Arsenazo III, at pH 2.0-6.0 with distribution coefficients of 2.9 center dot 10(3)-4.6 center dot 10(4) cm(3) g(-1). The adsorption capacity for REE was 1.25-2.85 mg g(-1). Silica, layer-by-layer modified with polyhexamethylene guanidine and Arsenazo III, was used for removal of REE from solutions after digestion of lignites and ashes after their burning.

Automated summary

Novel silica-based adsorption materials modified with polyhexamethylene guanidine and Arsenazo I or Arsenazo III showed high adsorption capacity for rare earth elements (REE), with the ability to extract different REEs under varying pH conditions. They are particularly effective for removing REE from coal and ashes.