公开(公告)号：US20220356102A1

公开(公告)日：2022-11-10

申请号：US17622658

申请日：2020-06-29

Applicant: GRAFOID INC.

Inventor： Michael Edward SHANNON ,  Yang ZHOU ,  Cameron S. RUNTÉ ,  Kiran Kumar MANGA ,  Janardhan BALAPANURU

IPC: C02F9/00 ,  B01D71/02 ,  B01D65/02 ,  C02F1/28 ,  C02F1/44

Abstract: The present invention provides a multi-stage filter system suitable for the production of drinking water from a wide variety of contaminated water sources. The modular nature of the multi-stage filter system allows for the customization of filter combinations according to the remediation requirements. The multi-stage filter system comprises a coarse filter (S1); an ultrafiltration filter (S2); a graphene-based filter (S3); and a residual nanoparticle filter (S4). The graphene-based filter cartridge comprises few-layer graphene powder; a combination of few-layer graphene powder and pellets comprising a mixture of polyethersulfone, graphene oxide (GO), and dimethylformamide; a composite comprising chitosan, GO, sodium sulfate and ferric chloride; or a combination of few-layer graphene powder, granular activated carbon and a composite comprising chitosan, GO, sodium sulfate and ferric chloride.