Study On Preparation, Characterization And Adsorption Properties Of Furfural Residue And Modified Furfural Residue

The adsorption technique is proved to be an effective and attractive process for the treatment of refractory pollutants from wastewaters. If the adsorbent material used is of cheaper cost and does not require any expensive additional pretreatment step, this method will become inexpensive and has economic, social and environmental meaning.To deal with the resource present status of agricultural by-product of waste materials of furfural residue, preparation of adsorbent furfural residue as raw material was put forward. Meanwhile,researehes on the adsorption of waste water containing dyes and heavy metals on furfural residue were investigated systematically. The results showed that the appropriate adsorption time of methylene blue and hexavalent chromium by furfural residue were 60min,100min, adsorbent dosage 12g.L^-1,20g.L^-1, adsorbent particle size 0.25mm,0.177mm, removal rates 95.57%,94.07% respectively. With the initial concentration and temperature increasing, the adsorption quantity increases. Adsorption equilibrium model can be approximately described with the Langmuir and Freundlich equation. It can be conducted adsorption kinetics constants that the peseudo-second-order model is the best choice among all the kinetic models to describe the adsorption behavior of methylene blue and hexavalent chromium onto furfural residue. The thermodynamic parameters: the negtive values ofΔG 0 and the positive values ofΔH 0indicate the adsorption is spontaneous and a endothermic process. The activation energy of adsorption of furfural residue binding methylene blue and hexavalent chromium is 12.2823kJ.mol^-1,25.3111 kJ.mol^-1 respectively. The values show the adsorption is a physical adsorption process.The preparation process of furfural residue as raw material were put forward with phosphoric acid as agents activation. The experiments of modification show that the optimum preparation proeess conditions for modification of furfural residue were 40min of activation time, 400℃of activation temperature, 60% of phosphoric acid concentration, 1:2 of solid-liquid ratio.An adsorption properties was studied for wastewater containing dye by modification of furfural residue. The results showed that the appropriate adsorption time of methylene blue by modified furfural residue were 40min, adsorbent dosage 6g.L^-1, removal rates 96.43%. With the initial concentration and temperature increasing, the adsorption quantity increases. Adsorption equilibrium model can be approximately described with the Langmuir and Freundlich equation. It can be conducted adsorption kinetics constants that the peseudo-second-order model is the best choice among all the kinetic models to describe the adsorption behavior of methylene blue onto modified furfural residue. The thermodynamic parameters: the negtive values ofΔG 0and the positive values ofΔH 0indicate the adsorption is spontaneous and a endothermic process. The activation energy of adsorption of modified furfural residue binding methylene blue is 12.615kJ.mol^-1 . The values show the adsorption is a physical adsorption process.The morphology, structure and composition of the composites are characterized by TG- DTA and FT-IR. FT-IR mapping analysis showed the infrared absorption spectra of furfural residue and modified furfural residue were mainly made up of carbohydrates, such as cellulose, lignin.