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Study of Adsorbing Phosphate from Wastewater on Palygorskite Iron/Aluminium Hydroxide Nano-compound Materials

Author: PanMin
Tutor: ChenTianHu
School: Hefei University of Technology
Course: Environmental Engineering
Keywords: Attapulgite Adsorption Phosphorus Thermodynamics Dynamics
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 242
Quote: 3
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Abstract


This article was prepared attapulgite / the aluminum hydroxide of ( PNCM I ) , attapulgite / iron hydroxides ( PNCM II ) and attapulgite / iron - aluminum hydroxide ( PNCM III ) 3 attapulgite clay nanocomposites , 3 Nanocomposites phosphorus adsorption mechanism and PNCM III processing of phosphorus-containing wastewater by adsorption thermodynamics and kinetics experiments to explore comparative study of these three kinds of composite materials and attapulgite clay adsorption of low concentrations of phosphorus in water purification capacity , experiments. The results show that : the of PNCM I and PNCM III two kinds of attapulgite clay nano composite material has a good adsorption of low concentrations of phosphorus in the water purification capacity , and temperature influence is very small . When the initial concentration of 1mg / L, 2mg / L and 5 mg / L ( P ) PNCM I PNCM III was added 0.1g of phosphorus removal rate reaches 99% or more , the residual concentration of phosphorus less than 0.05 mg / phosphorus adsorption capacity of about 8mg / g and 15mg / g ; these three attapulgite stone composite adsorption process belongs to the Langmuir adsorption ; △ H > 0 , △ G < 0 and △ S > 0 , and Ⅰ PNCM , PNCM Ⅱ and PNCM Ⅲ the △ G -29.12 ~ -22.0kJ/mol, -13.13 ~ -8.75kJ/mol and -34.61 to -25.91kJ/mol PNCM I and PNCM of III phosphorus adsorption is endothermic chemical and physical adsorption coexist the process PNCM II of adsorption , physical adsorption process is endothermic , and the entropy increase of the adsorption process . Attapulgite / the aluminum hydroxide of ( PNCM I ) , attapulgite / iron hydroxides ( PNCM in II ) and the attapulgite iron / aluminum hydroxide ( PNCM III ) 3 attapulgite clay nano- composite phosphorus adsorption can better meet the pseudo-second order kinetic equation ; PNCM III apparent phosphorus adsorption adsorption the activation energy 18.58kJ/mol , show that the adsorption is not a single chemical adsorption rate-determining step , there is also a liquid film diffusion the rate-determining step , is jointly controlled by film diffusion and chemical adsorption process . Experiments show that PNCM III adsorption package of phosphorus in the river , when the solid / liquid 1:1000 PNCM III total phosphorus removal rate of 95.48% , the residual phosphorus concentration of 0.044mg / L ; when the solid / liquid 1:500 , PNCM III total phosphorus removal rate was 97.69 % , the residual phosphorus concentration of 0.0225mg / L , can reach the surface water level II emission standards .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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