Tertiary amino alkali lignin( TA-AL) was successfully synthesized by a two-step approach; its application as an adsorbent for nitrate and phosphate ions in effluents was investigated. TA-AL was characterized by FT-IR,...Tertiary amino alkali lignin( TA-AL) was successfully synthesized by a two-step approach; its application as an adsorbent for nitrate and phosphate ions in effluents was investigated. TA-AL was characterized by FT-IR,zeta potential,SEM,and elemental analysis. Kinetic and equilibrium adsorption isotherms were determined to investigate the adsorption capacity of TAAL. The results revealed that TA-AL had a very strong adsorption capacity towards anions; the value of p HPZC( PZC,point of zero charge) was about 9. 2.The adsorption of nitrate and phosphate ions was related to effluent p H and initial anion concentration. The maximum absorption of nitrate and phosphate ions was about 26. 9 and 18. 4 mg / g when the initial concentration of the ions was 50 mg / L. The adsorption kinetics conformed to the pseudo-second-order kinetic equation,and the equilibrium data were suitably expressed by the Freundlich model. The regeneration studies confirmed that the lignin-based material was a promising adsorbent for nitrate and phosphate ions in water.展开更多
基金the financial support from the provincial scientific and technological project(2011GGB01165)the"Independent Innovation Project of Colleges and Universities"fund by Ji'nan city,Shandong province(No.201004035-2)+1 种基金the national twelfth five-year science and technology support program(No.2014BAC13B04)the"Major Projects for Analysis and Breakthrough of Several Significant Environmental Bottleneck Issues of Economic and Social Development in Shandong Province"(SDHBPJ-ZB-06)
文摘Tertiary amino alkali lignin( TA-AL) was successfully synthesized by a two-step approach; its application as an adsorbent for nitrate and phosphate ions in effluents was investigated. TA-AL was characterized by FT-IR,zeta potential,SEM,and elemental analysis. Kinetic and equilibrium adsorption isotherms were determined to investigate the adsorption capacity of TAAL. The results revealed that TA-AL had a very strong adsorption capacity towards anions; the value of p HPZC( PZC,point of zero charge) was about 9. 2.The adsorption of nitrate and phosphate ions was related to effluent p H and initial anion concentration. The maximum absorption of nitrate and phosphate ions was about 26. 9 and 18. 4 mg / g when the initial concentration of the ions was 50 mg / L. The adsorption kinetics conformed to the pseudo-second-order kinetic equation,and the equilibrium data were suitably expressed by the Freundlich model. The regeneration studies confirmed that the lignin-based material was a promising adsorbent for nitrate and phosphate ions in water.
