@inproceedings{SisLab3629,
       booktitle = {H?i ngh{\d i} V?t l{\'y} ch?t r?n v{\`a} Khoa h{\d o}c V?t li?u To{\`a}n qu?c - SPMS 2019},
           month = {November},
           title = {NGHI{\^E}N C?U CH? T{\d A}O V{\`A} KH{\h A}O S{\'A}T H{\d A}T CHITOSAN {\DJ}? H?P TH{\d U} PH{\^A}N {\DJ}{\d A}M URE},
          author = {Thi Hien Le and Van Dung Do},
            year = {2019},
           pages = {415--419},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3629/},
        abstract = {Trong c{\'a}c lo{\d a}i d??ng ch?t thi?t y?u cho c{\^a}y tr?ng ph{\^a}n ure {\dj}??c s? d{\d u}ng nhi?u nh?t trong s? c{\'a}c lo{\d a}i ph{\^a}n {\dj}{\d a}m. Tuy nhi{\^e}n, c{\^a}y tr?ng ch{\h i} h?p th{\d u} {\dj}??c ch{\h i} t? 30-40\% l??ng ure cung c?p do ph{\^a}n ure d? b{\d i} ph{\^a}n h{\h u}y v{\`a} r?a tr{\^o}i trong {\dj}?t g{\^a}y l{\~a}ng ph{\'i} v{\`a} {\^o} nhi?m m{\^o}i tr??ng. Trong c{\^o}ng tr{\`i}nh n{\`a}y, nghi{\^e}n c?u ch? t{\d a}o h{\d a}t chitosan {\dj}? h?p th{\d u} v{\`a} gi{\h a}i ph{\'o}ng ure. H{\d a}t gel chitosan {\dj}??c ch? t{\d a}o b?ng c{\'a}ch b?m dung d{\d i}ch chitosan v{\`a}o dung d{\d i}ch ch?t ho{\d a}t {\dj}?ng b? m?t natri dodecyl sulphat (SDS) ho?c dung d{\d i}ch mu?i Na?2HPO4. H{\d a}t gel chitosan t??ng ?ng t{\d a}o th{\`a}nh c{\'o} d{\d a}ng h{\`i}nh c?u r?ng v{\`a} h{\`i}nh c?u {\dj}?c v?i {\dj}??ng k{\'i}nh h{\d a}t gel ph{\d u} thu?c v{\`a}o th? t{\'i}ch gi{\d o}t dung d{\d i}ch chitosan. H{\d a}t chitosan mang ph{\^a}n {\dj}{\d a}m ure {\dj}??c t{\d a}o ra b?ng c{\'a}ch  ng{\^a}m c{\'a}c h{\d a}t gel chitosan trong dung d{\d i}ch ure v?i c{\'a}c n?ng {\dj}? kh{\'a}c nhau. S? c{\'o} m?t c{\h u}a ure trong h{\d a}t gel {\dj}??c kh?ng {\dj}{\d i}nh b?ng ph??ng ph{\'a}p ph? h?ng ngo{\d a}i chuy?n {\dj}?i chu?i Fourier (FTIR). Ure {\dj}??c {\dj}{\d i}nh l??ng b?ng ph??ng ph{\'a}p ph? h?p th{\d u} UV-vis t{\d a}i b??c s{\'o}ng 437 nm s? d{\d u}ng thu?c th? 4-(Dimethylamino)benzaldehyde (DMAB).  Th?i gian {\dj}? l??ng ure h?p th{\d u} t?i {\dj}a v{\`a}o h{\d a}t gel chitosan l{\`a} 30 ph{\'u}t. H{\d a}t chitosan {\dj}??ng k{\'i}nh 1mm {\dj}??c t{\d a}o b?i dung d{\d i}ch SDS v?i kh?i l??ng 30.3 mg/10 h{\d a}t c{\'o} t{\h i} l? ph?n tr{\u a}m kh?i l??ng ure l?n nh?t, kho{\h a}ng 96\%.}
}