Adsorbent for removing cadmium and arsenic in polluted farmland irrigation water as well as preparation method and removal method of adsorbent

• Main Authors: SUN YIPING, ZHU YUNLING, JIANG YISHUN, LIANG YONGCHAO, FAN XIAOPING, LAO QIANFENG, GAO ZIXIANG, MEI YUCHAO, XIAO ZHUOXI, TANG XIANJIN
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2022
• 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

The invention discloses an adsorbent for removing cadmium and arsenic in farmland polluted irrigation water and a preparation and removal method thereof, and the preparation method comprises the following steps: preparing silicon-doped ferrihydrite by using sodium metasilicate and ferric salt as raw materials through a chemical hydrolysis method, washing to remove impurities, drying, crushing, adding chitosan for bonding and forming, and drying to obtain the adsorbent for removing cadmium and arsenic in farmland polluted irrigation water. The granular adsorbent for removing the cadmium and the arsenic in the polluted farmland irrigation water is obtained. The adsorbent can be used for removing actual cadmium and arsenic polluted farmland irrigation water, the maximum adsorption capacity of arsenic can reach 40 mg/g or above, the maximum adsorption capacity of cadmium can reach 60 mg/g or above, only about 1 kg of the adsorbent needs to be put into each ton of polluted irrigation water, and cadmium and arsenic