Synthesis of wheat starch bio-based hydrogel and its assisted removal for NO2--N
Aiming at the defect of poor mechanical properties of wheat starch(CS)gel,PVA/B/CS and SA/B/CS bio-based hydrogels were synthesized by physical/chemical crosslinking of wheat starch with natural/inorganic materials such as polyvinyl alcohol(PVA),borax(B)and sodium alginate(SA).The mechanical properties and swelling properties of two composite bio-based hydrogels were studied.Bio-based hydrogel entrapped denitrifying bacte-ria was prepared,and its removal performance of nitrite nitrogen(NO2-N)in water was investigated.The results showed that the two bio-based hydrogels had good mechanical properties,the tensile elongation at break of PVA/B/CS hydrogels was up to 1 088％,and the tensile elongation at break of SA/B/CS hydrogels was up to 562％.The removal efficiency of PVA/B/CS2.7 hydrogel-embedded denitrifying bacteria(D-PVA/B/CS2.7)for NO2--N in water was 94.81％after 30 h.The removal efficiency of SA/B/CS2.7 hydrogel-embedded denitrifying bacteria(D-SA/B/CS2.7)for NO2--N in water was 94.99％after 40 h.It indicates that the synthesized bio-based hydrogel has an auxiliary effect on the removal of ammonia nitrogen in water.
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