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- Title
Enhanced adsorptive removal of naphthalene intermediates from aqueous solution by introducing reed straw into sewage sludge-based activated carbon.
- Authors
Gu, Lin; Guo, Huaqing; Zhou, Pin; Zhu, Nanwen; Zhang, Daofang; Yuan, Haiping; Lou, Ziyang
- Abstract
The disposal of sewage sludge (SS) and reed straw (RS) has becoming a critical issue due to their rapid production. In this study, the SS-based activated carbon (SSC) was produced by introducing the RS as a component material. Properties including BET surface area, pore volume, surface chemical groups, and morphologies were characterized. The adsorption of 1-diazo-2-naphthol-4-sulfonic acid (1,2,4-Acid) and 2-Naphthol (2-Nap), which differs in their physicochemical properties, on as-prepared carbons were investigated. The overall adsorption was found to be jointly controlled by external mass transfer and intraparticle diffusion, and the optimal pH was found to be 5 due to their electrostatic attraction. Further study revealed that the SS- and RS-based carbons (SC and RSC, respectively) exhibited different adsorption behavior toward 1,2,4-Acid and 2-Nap. The calculated adsorption capacity from Langmuir-Freundlich model of SC and RSC for the two intermediates was 141.0, 84.6 mg g and 48.2, 110.2 mg g, respectively, whereas their hybrid product (SSC) showed comparable capacity for 1,2,4-Acid (117.8 mg g), as well as higher capacity for 2-Nap (157.5 mg g). It was found that the presence of meso- or macropores facilitates the precipitation of mineral phases of inorganic substances during carbonization, attracting the molecules with polar functional groups, while the introduction of C-rich RS to SS enhances the adsorption of hydrophobic molecules.
- Subjects
ANALYTICAL chemistry; AQUEOUS solutions; SEWAGE sludge; ACTIVATED carbon; NAPHTHALENE -- Environmental aspects; HYDROPHOBIC compounds; CARBONIZATION
- Publication
Environmental Science & Pollution Research, 2014, Vol 21, Issue 3, p2043
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-013-2131-x