As （V） adsorption characteristics of iron oxide coated sands

• Published in: Chinese journal of geochemistry Vol. 25; no. B08; p. 142
• Main Author: Kyung-Seok Ko Jae Gon Kim In-Suk Oh Joo Sung Ahn Heejun Suk Hyoung-Soo Kim
• Format: Journal Article
• Language: English
• Published: 2006
• Subjects: 吸附作用; 氧化铁; 水处理
• ISSN: 1000-9426

The presence of arsenic has been great concern because of its toxicity for human health. Generally As forms stable solids in the presence of Ba and has strong affinity for sulfur. The purpose of the study is to compare the As （V） adsorption capacities of iron oxide coated sand （IOCS） and sulfate-modified coated sand （SMIOCS） which are used as water treatment materials for As removal. To describe the As （V） adsorption behaviour of IOCS and SMIOCS, the batch and kinetic experiments were conducted. The results of acid and alkali resistance tests for two iron oxide coated sands, IOCS and SMIOCS, showed that they were appropriate for the usage of water treatment material. From the XRD analysis by freeze-drying technique, the coated materials of IOCS and SMIOCS are proved to be goethite and barite. The batch and kinetic experiments showed that SMIOCS had higher adsorption capacity for As （V） than IOCS and it is caused by the higher surface area of SMIOCS than that of IOCS. The adsorption capacities of IOCS and SMIOCS were decreased by the lowering of pH.