改性污泥腐殖酸的表征及其对Cu<sup>2+</sup>的吸附特性

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Abstract

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.

Key words： sludge humic acid Cu²⁺ adsorption

Received: 19 July 2016

PACS:

X703

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	Articles by authors
	LONG Liang-jun
	WANG Li-ao
	YU Chun-li
	WEI Xing-yue
	ZHUO Lin

Cite this article:

LONG Liang-jun,WANG Li-ao,YU Chun-li等. Characterization of modified sludge-based humic acid and its adsorption properties for Cu²⁺[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1016-1023.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/1016

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