Effect of structural evolution of attapulgite on Pickering foam and fabrication of porous materials for removal methylene blue

•Pickering foam stabilized by APT with structural evolution and S. mukorossi.•Pickering foam as a template for green preparation of porous adsorbents.•Porous adsorbent could efficiently remove organic dyes from water.•Recovery of waste adsorbent to fabricate mineral biochar for soil improvement.