Characterization of modified sludge-based humic acid and its adsorption properties for Cu2+
LONG Liang-jun1,2, WANG Li-ao1, YU Chun-li2, WEI Xing-yue2, ZHUO Lin2
1. College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China;
2. College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
Humic acid (S-HA) was extracted from municipal sewage sludge. The S-HA was further modified by heating and the modified humic acid was obtained (MS-HA). The physicochemical properties of the samples were characterized with elemental analysis, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermogravimetric-differential scanning calorimetry (TG-DSC). The adsorption kinetics and isothermal adsorption process for copper (II) ions from aqueous solutions was investigated. The results indicated that the C/N and C/H of MS-HA ratio were 5.58 and 6.70, respectively. The surface of MS-HA was loose and abundant with non-homogeneous pores. The dehydration and decarboxylic reaction took place during the modification process and the amorphous structure was well-maintained. The equilibrium time was 18h and the optimal pH value was 4~6. The kinetic parameters and isotherms were calculated from the experimental data. The adsorption process can be fitted well with pseudo-second-order kinetic model. The adsorption data obtained can be described by the Langmuir adsorption isotherm model.
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