METHOD FOR PREPARING SELENIUM-ENRICHED MODIFIED BIOCHAR USED FOR ADSORBING CADMIUM

• Main Authors: SHAN, Dexin, LI, Jun, GAO, Zongyu
• Format: Patent
• Language: Chinese; English; French
• Published: 11.01.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

A method for preparing selenium-enriched modified biochar used for adsorbing cadmium. Selenium-enriched rice husks are impregnated in a hydrochloric acid solution of CaCl2 for 20-24 hours, and are dried and carbonized, the carbonization temperature being 300-700 ℃, and the carbonization time being 0.5-1.5 hours. The selenium-rich biochar prepared by the present invention has a specific surface area of 31.79 m2/g, and after modification, the selenium element in the biochar conducts a special function in promoting adsorption of Cd2+. In cooperation with other multiple mechanisms, the adsorption performance for heavy metal Cd2+ in wastewater is improved, and the selenium-enriched modified biochar has an adsorption capacity of 51.7 mg/g on Cd2+ with a concentration of 100 mg/L. L'invention concerne un procédé de préparation de biocharbon modifié enrichi en sélénium utilisé pour adsorber le cadmium. Des balles de riz enrichies en sélénium sont imprégnées dans une solution d'acide chlorhydrique de CaCl2 pendant 20