Preparation of a novel chelating fiber with amino and its adsorption for Hg 2+ Reporter ： Yang Ying Tutor: Professor Chen Shuixia

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

v 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. Ⅰ. Significance of this study

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

Ⅲ. Research programmes Scheme l. Synthesis of chelating fiber with amino groups (ACHF )

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

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

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

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

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

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

The optimal grafting conditions: v solvent tetrahydrofuran v reaction time 3h v reaction temperature 100 o C v monomer concentration 50 wt%

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

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

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

4 Mechanical properties Tab.1 Mechanical properties of PP and ACHF fibers FiberElongation/mmTensile strength /cN PP ACHF Growth/%4722

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

6 Adsorption capacity v 6.1Effect of pH on adsorption for Hg 2+ v 6.2Effect of initial concentration on adsorption v 6.3Effect of coexistence ion Cu 2+ on adsorption v 6.4Dynamic adsorption

Fig.8 Effect of pH on the adsorption capacity of Hg Effect of pH

Fig.9 Adsorption capacity of ACHF for high concentration of Hg 2+ in water 6.2Effect of initial concentration

Fig.10 Removal of trace Hg 2+ in water 6.2Effect of initial concentration

Conc. of Cu 2+ /mg.L initial conc. of Hg 2+ / mg.L residual conc. of Hg 2+ / mg.L Tab.2 Hg 2+ adsorption amount on ACHF with Cu 2+ coexist in solution 6.3Effect of coexistence ion Cu 2+

Fig.11 Effect of adsorption time on the adsorption capacity of Hg Dynamic adsorption

Fig.12 Effect of adsorption time on the adsorption capacity of Hg Dynamic adsorption

Ⅴ. Conclusions v A chelating fiber with amino (ACHF) has been prepared by pre-irradiation grafting and consequently aminating. v The results show that ACHF has better elasticity and flexibility, and good stability for common use. v Its adsorption capacity for Hg 2+ is up to mg/g. v The fiber can get rid of trace mercury in water to meet the max allowable concentration of Hg 2+ for drinking water.

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