Preparation of a novel chelating fiber with amino and its adsorption for Hg 2+

1. Preparation of a novel chelating fiber with amino and its adsorption for Hg2+ Reporter：Yang Ying Tutor: Professor Chen Shuixia

2. Ⅰ.Significance of this study • The effective treatment of heavy metals ions in the environment has been one of the major issues owing to economic and environmental factors. • Adsorption is one of the methods commonly used to remove heavy metal ions from various aqueous solutions with relatively low metal ion concentrations. • Chelating fibers are effective adsorbents and have several advantages : easy to prepare, highly selective, high absorption capacity, and good removal for heavy metals ions

3. Ⅰ. Significance of this study • Graft polymerization of glycidyl methacrylate (GMA) onto PP • increase surface-to-surface interactions • the epoxy group of GMA have a unique reaction capability • ring opening with various compounds possessing hydroxyl, amine, or activated methylene groups • introduce amine groups which are well-established chelating groups.

4. II. Objective • To prepare a novel chelating fiber with amino group. • Properties of the fiber: 1) high thermal stability and mechanical properties 2) high adsorption capacity for Hg2+ 3) thorough removal of trace Hg2+

5. Ⅲ.Research programmes Scheme l. Synthesis ofchelating fiber with amino groups (ACHF )

6. Ⅳ. results and discussion • 1 Preparation of ACHF • 2 IR spectra • 3 SEM photographs • 4 Mechanical properties • 5 Thermal stability • 6 Adsorption capacity

7. 1 Preparation of ACHF Effects of reaction conditions on grafting rate of PP-g-GMA • 1.1The reaction medium • 1.2The reaction temperature • 1.3The reaction time • 1.4The concentration of monomer

8. 1.1The reaction medium Fig.1Effect of reaction medium on grafting rate

9. 1.2The reaction temperature Fig.2 Effect of reaction temperature on grafting rate

10. 1.3The reaction time Fig.3 Effect of reaction time on grafting rate

11. 1.4The concentration of monomer Fig.4 Effect of the concentration of monomer on grafting rate

12. The optimal grafting conditions: • solvent tetrahydrofuran • reaction time 3h • reaction temperature 100oC • monomer concentration 50 wt%

13. 2 IR spectra Fig.5 FT-IR spectra of original PP, PP-g-GMA and ACHF

14. 2 IR spectra Fig.6 FT-IR spectra of ACHF and ACHF chelated Hg2+

15. 3 SEM photographs Fig.6 SEM photographs of original PP and ACHF

16. 4 Mechanical properties Tab.1 Mechanical properties of PP and ACHF fibers

17. 5 Thermal stability Fig.7 TGA results of PP, PP-g-GMA and ACHF

18. 6 Adsorption capacity • 6.1Effect of pH on adsorption for Hg2+ • 6.2Effect of initial concentration on adsorption • 6.3Effect of coexistence ion Cu2+ on adsorption • 6.4Dynamic adsorption

19. 6.1 Effect of pH Fig.8 Effect of pH on the adsorption capacity of Hg2+

20. 6.2Effect of initial concentration Fig.9 Adsorption capacity of ACHF for high concentration of Hg2+ in water

21. 6.2Effect of initial concentration Fig.10 Removal of trace Hg2+ in water

22. 6.3Effect of coexistence ion Cu2+ Tab.2 Hg2+ adsorption amount on ACHF with Cu2+ coexist in solution

23. 6.4Dynamic adsorption Fig.11 Effect of adsorption time on the adsorption capacity of Hg2+

24. 6.4Dynamic adsorption Fig.12 Effect of adsorption time on the adsorption capacity of Hg2+

25. Ⅴ. Conclusions • A chelating fiber with amino (ACHF) has been prepared by pre-irradiation grafting and consequently aminating. • The results show that ACHF has better elasticity and flexibility, and good stability for common use. • Its adsorption capacity for Hg2+ is up to 785.28mg/g . • The fiber can get rid of trace mercury in water to meet the max allowable concentration of Hg2+ for drinking water.

26. Acknowlegements: • Professor Chen is acknowledged for both the support of this work and his sincere instruction. • Dr. Ma, Dr. Zhang and other colleagues • Financial supports from Key project of Sci-Tech of Guangdong Province, and Innovation Research Fund of the School of Chemistry and Chemical Engineering

27. Thank you !