Study On The Absorption Of The Dye By Modified Pine Needles

The dyes effluent have great influence on the environment, the effective governance of dye wastewater have an important and positive significance to human health and environmental protection. The research in agriculture waste has had certain progress, peanut shells, rice shell, corn straw, such agricultural waste has been used to research for future alternative sorbents. In this experiment, pine needles, as forestry waste, after chemical modification, is used for the dye adsorption experiment as biomass adsorbent.This paper studies the pine needles modified by supercritical method and Steam blasting method for adsorption behavior methylene blue and alkaline magenta, In this paper the best adsorption conditions had been determined by examining the dye solution of the initial concentration, temperature, pH value,and the dosage of adsorption, the concentration of the salt solution ions; Discussesed the adsorption mechanism through the fitting of the Langmuir and Freundlich isothermal model; Determined reaction series of the adsorption processes through the dynamic experiment.The results of adsorption of alkaline magenta by the pine needles modified by supercritical method showed that when the concn of dyes was 100mg/L, absorbents dosage was 1.0g/L, pH value was 6.0,temperature was about 25℃and oscillation time was 180min, the adsorption capacity can reach 90.57mg/g. In this condition, the Langmuir type adsorption model can describe this adsorption process, and the secondary dynamic equation can describe the adsorption process.The results of adsorption of alkaline magenta by the pine needles modified by Steam blasting method showed that when the concn of dyes was 100mg/L, absorbents dosage was 1.6g/L, pH value was 4.0, temperature was about 25℃and oscillation time was 180min, the adsorption capacity can reach 92.83mg/g. In this condition, the Langmuir type adsorption model can describe this adsorption process, and the secondary dynamic equation can describe the adsorption process.The results of adsorption of methylene blue by the pine needles modified by Steam blasting method showed that when the concn of dyes was 100mg/L, absorbents dosage was 1.6g/L, pH value was 6.0, temperature was about 25℃and oscillation time was 180min, the adsorption capacity can reach 91..3mg/g. In this condition, the Langmuir type adsorption model can describe this adsorption process,and the linear dynamic equation can describe the adsorption process.