Adsorption of heavy metal ions in water by surface functionalized magnetic composites: a review

Abstract

Water pollutions caused by toxic heavy metal ions and their by-product can effectively be removed by adsorption method, but traditional adsorbents generally have problems such as inconvenient adsorbent recovery, low...

Effects of Polyether Amine Canopy Structure on Heavy Metal Ions Adsorption of Magnetic Solvent-Free Nanofluids

“…The relationship between the equilibrium adsorption quantity ( Q e ) of Fe 3 O 4 (0.5 g)/KH560/M2070 adsorbent on the heavy metal ions and pH was illustrated in Figure 6 d. It was evident that the adsorption capacity of Fe 3 O 4 (0.5 g)/KH560/M2070 for heavy metal ions increases with the pH ranging from 4 to 8. At low pH, the adsorption capacity of Fe 3 O 4 (0.5 g)/KH560/M2070 was low due to the protonation of the amine groups to –NH 2+ – under low pH conditions and competition between H + and metal cations for the active sites of the adsorbent surface [ 33 , 34 ].…”

Nd Recovery from Wastewater with Magnetic Calcium Alginate ((1,4)-β-d-Mannuronic Acid and α-L-Guluronic Acid) Hydrogels

“…In addition, chronic water scarcity, hydrological changeability, and extreme weather events (such as droughts and floods) are noticed as some of the biggest risks to global prosperity and stability. Acceptance of the role that water scarcity and drought are playing in aggravating fragility and conflict is increasing. , The most important issue that requires immediate attention in today’s society is heavy metal ion pollution, which is also one of the major problems . To find powerful ways to purify water at lower costs and with less energy, while also limiting the overall environmental effect, addressing these difficulties has spurred a significant amount of research.…”

“…To find powerful ways to purify water at lower costs and with less energy, while also limiting the overall environmental effect, addressing these difficulties has spurred a significant amount of research. The most common techniques for removing heavy metal ions from water pollution are distillation, catalysis, electrochemical precipitation, solvent extraction, crystallization, oxidation, ion exchange, membrane separation, and adsorption techniques; among these, the adsorption technique is thought to be the simplest and most efficient due to its high efficiency, reproducibility, and adaptable material design. − The use of magnetic adsorbent materials in the adsorption processes has become an increasingly attractive issue. Some authors have reported that heavy metals can be removed from wastewater by using magnetic nanoparticles. − In this study, magnetic Fe-based sub-micron particles were produced and used.…”

“…1 , 2 The most important issue that requires immediate attention in today’s society is heavy metal ion pollution, which is also one of the major problems. 3 To find powerful ways to purify water at lower costs and with less energy, while also limiting the overall environmental effect, addressing these difficulties has spurred a significant amount of research. The most common techniques for removing heavy metal ions from water pollution are distillation, catalysis, electrochemical precipitation, solvent extraction, crystallization, oxidation, ion exchange, membrane separation, and adsorption techniques; among these, the adsorption technique is thought to be the simplest and most efficient due to its high efficiency, reproducibility, and adaptable material design.…”

A 2-fold interpenetrated zinc–organic framework with Lewis basic triazole sites: luminescence sensing of Fe3+ and Cr2O72−, and warm white-light emission by encapsulated Ln3+ ions

“…4 Nevertheless, Cr 2 O 7 2− is highly carcinogenic and has been listed as a group "A" carcinogen for human by the World Health Organization. 5,6 Therefore, it is very crucial and urgent for the human health and environmental protection to design and prepare highly selective and sensitive sensor materials for detecting Fe 3+ and Cr 2 O 7 2− ions.…”