Research Progress of Adsorption on Heavy Metals from Aqueous Solutions by Modified Diatomite

Abstract

Pollution of heavy metals has become a serious environmental problem and it needs to be solved as soon as possible. Diatomite is a kind of biogenic rock and it is siliceous and sedimentary. There is abundant diatomite resource in China. Diatomite has distinctive structure of diatom monoblock. It has strong adsorbability, its specific area is large and it has high porosity. Its surface adheres a lot of active groups and negative charge. Diatomite with proper modification would show outstanding absorption effect of heavy metal ions. This paper reviewed the absorption efficiency of heavy metal ions on diatomite modified by metallic oxide, acids and bases, acticarbon, calcium carbonate and organics, the results would offer references for related researches. At last, this paper takes the outlook for the modified methods and application prospects of diatomite in wastewater treatment of heavy metals.

Computational Study of APTES Surface Functionalization of Diatom-like Amorphous SiO2 Surfaces for Heavy Metal Adsorption

“…In the last decade, numerous experimental studies proposed the use of functionalized diatoms for heavy metal (HM) removal in water, ,− in addition to other technological applications such as biological or micro/nanodevice applications. ,,, HMs are one of the most widespread contaminants and one of the most important threats to the environment and health worldwide. − The development of efficient platforms to palliate the presence of HMs from waters and soils is, therefore, a matter of primary interest. HMs are very stable and cannot be biodegraded.…”

A computational study of APTES surface functionalization of diatom-like amorphous SiO2 surfaces for heavy metal adsorption

“…In the last decade, numerous experimental studies proposed the use of functionalized diatom for heavy metal (HM) removal in water 4,[14][15][16][17][18] , in addition to other technological applications such as biological or micro/nanodevice applications. 4,5,14,19 HMs are one of the most widespread contaminants and one of the most important threats to the environment and health worldwide [20][21][22][23] .…”