Graphene Oxide-Based Nanofiltration for Hg Removal from Wastewater: A Mini Review

Abstract

Mercury (Hg) is one of heavy metals with the highest toxicity and negative impact on the biological functions of living organisms. Therefore, many studies are devoted to solving the problem of Hg separation from wastewater. Membrane-based separation techniques have become more preferable in wastewater treatment area due to their ease of operation, mild conditions and also more resistant to toxic pollutants. This technique is also flexible and has a wide range of possibilities to be integrated with other techniques. Graphene oxide (GO) and derivatives are materials which have a nanostructure can be used as a thin and flexible membrane sheet with high chemical stability and high mechanical strength. In addition, GO-based membrane was used as a barrier for Hg vapor due to its nano-channels and nanopores. The nano-channels of GO membranes were also used to provide ion mobility and molecule filtration properties. Nowadays, this technology especially nanofiltration for Hg removal is massively explored. The aim of the review paper is to investigate Hg removal using functionalized graphene oxide nanofiltration. The main focus is the effectiveness of the Hg separation process.

Fabrication and prospective applications of graphene oxide-modified nanocomposites for wastewater remediation

“…This research serves as a guide for removing heavy metals from wastewater in order to reduce water pollution and facilitate ecological building. 42 …”

Polysulfone Membranes Based Hybrid Nanocomposites for the Adsorptive Removal of Hg(II) Ions

“…For example, GO was introduced into a PSF ultrafiltration membrane to improve hydrophilicity and antifouling abilities of the membrane for water treatments as adsorbent of a mixture of selected organic contaminants of environmental relevance [ 32 ]. In addition, a GO-based polymer membrane was used as a filtration or adsorptive membrane for Hg separation from wastewater [ 33 ].…”

Two-Dimensional Nanomaterials for the Removal of Pharmaceuticals from Wastewater: A Critical Review

“…Additionally, other organics were almost completely degraded in about 60 min. 2 . Additionally, the effects on the degradation rate of different anions, cations and natural water sources were investigated.…”

“…The contamination level of natural water streams has increased in recent decades due to the rapid global industrial development associated with a growing world population. This generates many inorganic contaminants (toxic heavy metals-e.g., arsenic, lead, mercury, cobalt-and toxic gases-e.g., NO x , SO x , CO, NH 3 -), and organic contaminants including dyes, pesticides, and pharmaceuticals as well as bio-toxics [1][2][3][4][5]. In this scenario, the need for new, highly efficient wastewater treatment processes is compelling considering: (i) the extremely variable composition of the effluents, (ii) the refractory behaviour of several pollutants to conventional chemical and biological remediation methods (coagulation, flocculation, screening, centrifugation, flotation, aerobic and anaerobic treatments), and (iii) the low concentration at which these contaminants are present in wastewater streams.…”