粉末活性焦对水中磷酸盐的吸附性能

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Abstract

Powdered activated coke (COKE) derived from one-step carbonization and activation of Mengdong lignite was obtained by using a sedimentation furnace. It had developed pore structure on the surface, which is dominated by micropores, accounting for 79.3% of its specific surface area. The phosphate adsorption ability of the COKE was studied by investigating the effects of adsorption time, temperature, initial pH, initial phosphate concentration, the dosage of COKE and coexisting anions on the adsorption process. Furthermore, the adsorption kinetics, isotherms, and thermodynamics were analyzed, correspondingly. It was shown in the results that coke has good adsorption properties for phosphate in water. The adsorption equilibrium was reached at 60min when 1mg/L phosphate solution in neutral was adsorbed by 3.0g/L COKE at the temperature of 30℃, and the adsorption efficiencies are 89.4%. It was found that the optimum pH value for the adsorption was 6~7, and the extent of adsorption of phosphate by COKE in water increased significantly with increase in temperature and concentration of COKE. The presence of competing anions (NO₃^-, SO₄^2-, CO₃^2-) has an inhibitory effect on the adsorption of phosphate by COKE under the researched conditions. The adsorption process of phosphate on COKE could be successfully described by Freundlich model (R²>0.99) and quasi-secondary kinetic model (R²>0.99). The maximum adsorption capacity was 1.746mg/g at the temperature of 30℃. It was shown by thermodynamic analysis that the adsorption is spontaneous endothermic reaction with that the value of ΔH is 37.548kJ/mol. Further, the results of FTIR analysis showed that phosphate adsorption of COKE mainly depended on coordination exchange. Compared with activated carbon, the COKE prepared in this study has higher performance-price ratio, and hence, would be expected to show a favorable application prospect.

Key words： phosphate adsorption activated coke dynamic model adsorption isotherm

Received: 22 February 2019

PACS:

X703.5

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	Articles by authors
	SUN Xiao-fei
	CHEN Gui-fang
	AN Dong-hai
	MAO Yan-peng
	MA Chun-yuan

Cite this article:

SUN Xiao-fei,CHEN Gui-fang,AN Dong-hai等. The adsorption property of powder activated coke on phosphate in water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3797-3806.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I9/3797

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