Graphene-oxide modified polyvinyl-alcohol as microbial carrier to improve high salt wastewater treatment

Abstract

a b s t r a c tThis work discussed the preparation and characterization of graphene oxide (GO) modified polyvinyl alcohol (PVA) for bacteria immobilization to enhance the biodegrdation efficiency of saline organic wastewater. GO-PVA material has lamellar structure with higher surface area to support bacterial growth and high salinity tolerance. It significantly stimulated the bacterial population by 1.4 times from 2.07 Â 10 3 CFU/mL to 5.04 Â 10 3 CFU/mL, and the microbial structure was also improved for salinity tolerance. Acinetobacter, Pseudomonas and Thermophilic hydrogen bacilli were enriched inside GO-PVA materials for glucose biodegradation. Compared to the COD Cr removal efficiency with only PVA as the carrier (52.8%), GO-PVA material had better degradation performance (62.8%). It is proved as a good candidate for bioaugmentation to improve biodegradation efficiency in hypersaline organic wastewater.

Functional Graphene Nanomaterials Based Architectures: Biointeractions, Fabrications, and Emerging Biological Applications

“…Moreover, FGNs have also been used as a delivery vehicle to promote antibacterial ability. ,− The specific properties of FGNs made them ideal candidates for designing antibacterial materials to prevent infections from wound healing or external injuries. ,− On the contrary of antibacterial, FGNs can also be applied as a platform for bacterial adhesion in diverse applications, such as pathogen detection, bioreactors and MFCs. − More recently, Qi, Seeberger, and Haag et al demonstrate that mannose ligands conjugated FGNs provide a new platform with multivalent adhesion of specific bacteria . They assembled the cyclodextrin-based mannose ligands on adamantyl-functionalized thermal reduced GO (TRGO) sheets via host–guest inclusion to fabricate the nanoplatform to capture Escherichia coli ( E. coli ), as shown in Figure .…”

Fundamentals, Applications, and Future Directions of Bioelectrocatalysis

“…Carbonaceous electrodes, including carbon cloth, carbon felt, carbon paper, carbon mesh, and carbon nanotubes, are among the most extensively used electrode materials in microbial-based bioelectrocatalysis. , Besides their recognized antibacterial surface properties, − graphene materials have also been successfully used is bioelectrocatalytic schemes, as they provide large electroactive area, conductivity, and sturdiness. − Although carbon is a widely used electrode material, its hydrophobic surface properties minimize cell adhesion, which results in limited electron transfer kinetics . Therefore, carbon-based surfaces are often modified with metal oxide nanocomposites and conductive polymer conjugates to promote bacterial attachments and enhance electron transfer abilities. , Zou and co-workers showed a successful combination of graphene oxide with titanium dioxide (TiO 2 ) nanocomposites, providing suitable conductive and hydrophilic characteristics, for an improved bioelectrocatalytic system with fast direct electron transfer kinetics and enhanced Shewanella putrefaciens growth .…”

Enhancing mechanical properties of polyvinyl alcohol/sodium alginate gel beads by graphene oxide for the aerobic sludge immobilization in wastewater treatment

“…GO can encouraged the growth of the microorganisms but the mechanical strength was not concerned [12] PVA/SA (concentrated activated sludge)…”