Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

Table 7

Summary of patents related to the preparation of carbon-based magnetic adsorbents.

Adsorbent	Adsorbate	Patent (year)	Status	Reference
Fly ash-ferromagnetic salts	Metallic ions	WO2003053860A1, 2003	Active	[178]
Magnetic adsorbents using activated carbon, zeolite, silica gel, and alumina	Heavy metals, organic compounds, and microorganisms	JP2005137973A, 2005	Pending since 2005	[179]
Aminopropyl groups-zirconium ferrite	Arsenic	JP2005046728A, 2005	Active	[264]
Porous carbon material composite obtained from plant-derived material and an oxide semiconductor	Organic compounds and other applications in cosmetics and photocatalysis	US20160243529A1, 2009	Abandoned	[182]
Magnetic nanoparticles	Selenates	JP6494468B2, 2009	Active	[265]
Hierarchical magnetic nanoparticle-enzyme mesoporous assemblies embedded in macroporous scaffolds	Aromatic compounds	US20180087043A1, 2013	Active	[266]
Magnetic nanoparticles decorated activated carbon nanocomposites	Methylene blue and methyl orange dyes	US20160243523A1, 2014	Abandoned	[267]
Magnetic adsorbent using polyacrylamide solution and ferrite	Heavy metals and phosphate	US10569250B2, 2015	Active	[268]
Ferrous metal-organic framework	Phosphate	CN105688825A, 2016	Active	[183]
Activated carbon impregnated with iron oxide	Mercury	AU2018203359B2, 2018	Active	[184]
Carbon allotropes surrounding the ferromagnetic particles	Heavy metals, drugs and oils	US20190091661A1, 2019	Abandoned	[185]