ZIF-8@s-EPS as a novel hydrophilic multifunctional biomaterial for efficient scale inhibition,antibacterial and antifouling in water treatment

摘要

The hydrophilic biomaterial was constructed based on the soluble extracellular polysaccharides (s-EPS) secreted by Bacillus megaterium and zeolitic imidazolate framework-8 (ZIF-8),namely ZIF-8@s-EPS,wrapped in s-EPS shell with ZIF-8 as the core.ZIF-8@s-EPS was used as a novel multifunctional biomaterial in water treatment for the first time.Unexpectedly,results showed ZIF-8@s-EPS with strong synergistic effect presented multifunctional performances including descaling,antifouling and antibacterial.Scale inhibition efficiency reached 98.63% for CaCO_3 and as high as 99.40% for CaSO_4 at concentration 20.00 mg/L.The synergy of s-EPS and ZIF-8 demonstrated effective antibacterial activity against Pseudomonas aeruginosa and inhibitory effect on biofilms,and result presented that ZIF-8@s-EPS could inhibit the growth of nearly 89.4% P.aeruginosa.Therefore,the obtained insights will shed light on the development of s-EPS modified biomaterials in water treatment.