NGO/PDA-DAG改性膜制备及抗污染性能研究

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Abstract The NGO/PDA-DAG modified membrane was prepared with PVDF membrane as the raw material, the chemicals dopamine (DA), 1,3-diaminoguanidine hydrochloride (DAG) and aminated graphene oxide (NGO) as modifiers, the oxidative deposition method combined with surface grafting way as the modification technology. The preparation conditions of the modified membrane and its anti-fouling performance were investigated. The results were shown as below:①The optimal preparation conditions of the modified membrane were DA 1.5mg/mL, oxidation deposition time of DA 4hour, DAG 1wt%, NGO 2mg/mL and grafting time of NGO 1hour;②The hydrophilicity of the modified membrane were improved significantly. The modifiers introduced hydrophilic functional groups such as -NH₂, C=N, -OH and C=O to the membrane surface, which reduced the static contact angle from 68.7° (the original membrane) to 38.7° (the modified one);③The modified membrane showed a higher mechanical strength than that of the original membrane. The modification layer improved the stress transferring dead zone on the surface of the original membrane, thus the surface roughness of the modified membrane dropped from 46.5nm to 18.3nm. The tensile strength and Young's modulus of the modified membrane were 22.83 and 376.25Mpa respectively, which were 39.72% and 13.57% higher than those of the original membrane;④The selective permeability and anti-organic fouling performance of the modified membrane were enhanced markedly. Compared with the original membrane, the modified membrane's interception rate of BSA and the pure water flux recovery rate increased by 18.64% and 34.08% separately, its total fouling rate decreased by 20.67% (where, reversible fouling rate increased by 13.41%, and irreversible fouling rate decreased by 34.08%);⑤The modified membrane has possessed strong antibacterial performance, and the antibacterial effect was stable and lasting. The antibacterial rate of the modified membrane under four consecutive antibacterial tests (contacting conditions:38℃, 2hour) was 92.3%, 88.5%, 87.9%, 85.6%, respectively, which can effectively prevent the modified membrane from biofilm fouling, and the original membrane did not have any antibacterial properties.

Key words： aminated graphene oxide guanidine antibacterial agent modified membrane anti-organic fouling performance antibacterial performance

Received: 09 May 2020

PACS:

X703.1

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	Articles by authors
	LI Dong-mei
	LI Shu-bin
	LIN Xian-zeng
	LIN Hong-yu
	ZHANG Bo-wen
	FENG Li

Cite this article:

LI Dong-mei,LI Shu-bin,LIN Xian-zeng等. Study on the preparation of NGO/PDA-DAG modified membrane and its anti-fouling performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5299-5307.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5299

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