Adsorbents Based on Rice Production Waste and Natural Aluminosilicate for Purification of Wastewater from Dissolved Organic Compounds

The synthesis of carbon-mineral adsorbents was carried out in order to purify water from organic compounds using rice husk (RH) and its pyrolysis product (PRH) Adsorbents with a microporous structure were obtained by steam-gas activation of the PRH. Based on natural montmorillonite clay and hydrophobizers (RH and PRH), samples with a mesoporous structure were obtained by pyrolysis of a molded mixture of clay and a hydrophobizer. For the synthesized adsorbents, the isotherms of adsorption of water vapor at 20 °C and the isotherms of adsorption of nonionic surfactant neonol AF 9-10 from aqueous solutions at 20 °C in the concentration range of 0–80 mg/l were determined. It is shown that these adsorbents had an adsorption capacity of neonol AF 9-10 slightly inferior to the best industrial activated carbons. It is concluded that carbon-mineral adsorbents synthesized using RH and PRH can be recommended for adsorption treatment of wastewater from dissolved organic substances.