The Effects of Pore Structure and Surface Functional Groups of Sludge Activated Carbon on the Adsorption of Organic Pollutants
The physicochemical properties of sludge activated carbon (SAC) and its effects on the adsorption of phenol and nitrobenzene were investigated. The surface area of SAC was much smaller than that of a market activated carbon (MAC). Functional groups on the SAC are all acid groups while basic groups were the dominant on the MAC. Kinetic data of phenol and nitrobenzene adsorption on SAC and MAC fitted to the pseudo second-order model best. Compared with the MAC, the mesoporous character of SAC leads to a quicker diffusion of phenol. The adsorption of phenol and nitrobenzene on the SAC had a better agreement with the Freundlich equation. The adsorption data of MAC fitted Langmuir equation better. The saturated phenol and nitrobenzene adsorption capacity of SAC was 0.48mmol/g and 1.26mmol/g respectively. The phenol adsorption was almost only affected by the surface area. However, the nitrobenzene adsorption was affected by both the surface area and the surface functional groups. Acid groups on SAC can promote the adsorption of nitrobenzene. For chemical adsorption, orientation force and hydrophobic interaction are the main mechanisms affecting nitrobenzene adsorption on SAC.
Dao-jing LI Weng-bo JIANG Li FENG Li-qiu ZHANG
College of Environmental Science and Engineering, Beijing Forestry University, Beijing, China
国际会议
The Fifth International Conference on Waste Management and Technology(第五届固体废物管理与技术国际会议)
北京
英文
446-449
2010-11-01（万方平台首次上网日期，不代表论文的发表时间）