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

[摘要] 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).

[发布机构] College of Civil Engineering, Sichuan Agricultural University, Dujiangyan; 611830, China^1;College of Environment, Sichuan Agricultural Universities, Chengdu; 611130, China^2;Department of Physical and Chemical Analysis, Dujiangyan Center for Disease Control and Prevention, Dujiangyan; 611830, China^3

[效力级别] 材料科学

[关键词] Adsorption effect;Adsorption performance;Composite activated;Hazardous wastes;Leaching concentrations;Leaching toxicity;Polar solutes;Surface functional groups