Rice Straw/Sewage Sludge-Based Composite Activated Carbon: Its Some Basic Properties and Adsorption Effect for Cr (VI)

• Published in: IOP conference series. Materials Science and Engineering Vol. 484; no. 1; pp. 12008 - 12012
• Main Authors: Fan, Liangqian, Wang, Xianda, Wan, Wenxin, Liu, Qin, Cai, Jie, Wan, Yan
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 19.03.2019
• Subjects: Activated carbon; Adsorption; Copper; Functional groups; Hazardous wastes; Heavy metals; Iodine; Iron; Leaching; Sewage disposal; Sewage sludge; Sludge; Surface chemistry; Toxicity; Zinc
• ISSN: 1757-8981; 1757-899X; 1757-899X
• DOI: 10.1088/1757-899X/484/1/012008

In this study, the rice straw/sewage sludge-based composite activated carbon (RS-SCAC) was prepared from the mixture of sewage sludge and rice straw. Some basic properties of RS-SCAC, i.e., yield, iodine number, contents of heavy metals, surface functional groups, and leaching toxicity, were characterized. Furthermore, the adsorption performance of RS-SCAC for Cr (VI) was investigated. For RS-SCAC, the yield was moderate, and the iodine number was higher than that of the sewage sludge-based activated carbon (SBAC). RS-SCAC contained a variety of heavy metals, and Zn, Fe, and Cu had the relatively high content. The surface of RS-SCAC was rich in functional groups, especially for -OH, -COOH, and -COH, which was helpful for the adsorption of polar solute. For all heavy metals except Zn in RS-SCAC, the leaching concentrations were below the limits for identifying hazardous wastes, which indicated that RS-SCAC was relatively safe. Compared with SBAC, RS-SCAC had the better adsorption effect for Cr (VI). The results indicated that RS-SCAC can be used as a safety and efficient adsorbent for Cr (VI).