Graphene oxide surface modification of polyamide reverse osmosis membranes for improved N-nitrosodimethylamine (NDMA) removal

Croll, Henry C.; Soroush, Adel; Pillsbury, Makenzie E.; Castrillón, Santiago Romero-Vargas

doi:10.1016/j.seppur.2018.08.070

Cited by 35 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4c shows the Raman spectrum obtained for the ABC sample, in which, 1324 cm −1 is indicated like the Raman shift used as a marker for the GO. Other authors have reported similar findings on GO dispersed in different matrices, such as inorganic silica particles [37] or polymeric substrates [38,39], where Raman spectroscopy showed a comparable surface pattern, concluding the homogeneous distribution and compatibility of GO across the respective matrices.…”

Section: Resultssupporting

confidence: 65%

Novel Bioactive and Antibacterial Acrylic Bone Cement Nanocomposites Modified with Graphene Oxide and Chitosan

Zapata

Mina

Grande-Tovar

et al. 2019

IJMS

View full text Add to dashboard Cite

Acrylic bone cements (ABCs) have played a key role in orthopedic surgery mainly in arthroplasties, but their use is increasingly extending to other applications, such as remodeling of cancerous bones, cranioplasties, and vertebroplasties. However, these materials present some limitations related to their inert behavior and the risk of infection after implantation, which leads to a lack of attachment and makes necessary new surgical interventions. In this research, the physicochemical, thermal, mechanical, and biological properties of ABCs modified with chitosan (CS) and graphene oxide (GO) were studied. Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1H-NMR) scanning electron microscopy (SEM), Raman mapping, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), compression resistance, mechanical dynamic analysis (DMA), hydrolytic degradation, cell viability, alkaline phosphatase (ALP) activity with human osteoblasts (HOb), and antibacterial activity against Gram-negative bacteria Escherichia coli were used to characterize the ABCs. The results revealed good dispersion of GO nanosheets in the ABCs. GO provided an increase in antibacterial activity, roughness, and flexural behavior, while CS generated porosity, increased the rate of degradation, and decreased compression properties. All ABCs were not cytotoxic and support good cell viability of HOb. The novel formulation of ABCs containing GO and CS simultaneously, increased the thermal stability, flexural modulus, antibacterial behavior, and osteogenic activity, which gives it a high potential for its uses in orthopedic applications.

show abstract

Section: Resultssupporting

confidence: 65%

Novel Bioactive and Antibacterial Acrylic Bone Cement Nanocomposites Modified with Graphene Oxide and Chitosan

Zapata

Mina

Grande-Tovar

et al. 2019

IJMS

View full text Add to dashboard Cite

show abstract

“…172 When tested with two different polyamide membranes, NDMA and N-nitrosomethylethylamine (NMEA) were rejected at a lower rate than both larger nitrosamines and also similarly sized non-nitrosamine structural analogs with reduced hydrogen bonding ability (e.g., their formamide analogs). 172 The rejection of nitrosamines by polyamide RO membranes can be greatly improved through methods such as heat-treating the membranes 173 or functionalizing the surface with graphene oxide, 174 but both of these modifications reduce water permeability which may limit their practical application. Physical removal techniques can be paired with destructive methods.…”

Section: ■ the Structure Of Nitrosaminesmentioning

confidence: 99%

An Organic Chemist’s Guide to N-Nitrosamines: Their Structure, Reactivity, and Role as Contaminants

2021

View full text Add to dashboard Cite

N-Nitrosamines are a class of compounds notorious both for the potent carcinogenicity of many of its members and for their widespread occurrence throughout the human environment, from air and water to our diets and drugs. Considerable effort has been dedicated to understanding Nnitrosamines as contaminants, and methods for their prevention, remediation, and detection are ongoing challenges. Understanding the chemistry of N-nitrosamines will be key to addressing these challenges. To facilitate such understanding, we focus in this Perspective on the structure, reactivity, and synthetic applications of N-nitrosamines with an emphasis on alkyl N-nitrosamines. The role of Nnitrosamines as water contaminants and the methods for their detection are also discussed.N-Nitrosamines (or simply "nitrosamines") are a class of compounds sharing the general structure 1 (Chart 1), where

show abstract

“…Generally, during the formation of fouling layers on the membrane surface can beg and generate the back diffusion of dissolved salt ions which generates an increase in the concentration of salt ions on the side of the membrane surface. Results revealed that the membrane performcae may change due to organic and inorganic matter in water during osmosis process, which needs to tackle by modifying the membrane with advanced material (Anis et al, 2019;Badruzzaman et al, 2019;Croll et al, 2019;Ghaemi and Khodakarami, 2019;Ghaseminezhad et al, 2019;Joseph and Damodaran, 2019;Liu et al, 2019;Nguyen et al, 2019;Rehman et al, 2019;Shakeri et al, 2019;Tang et al, 2019;Weinman et al, 2019;Zou et al, 2019).…”

Section: Atomic Absorption Spectrometry (Aas) Resultsmentioning

confidence: 99%

Characterization of seawater reverse osmosis fouled membranes from large scale commercial desalination plant

Int¹

2019

Preprint

View full text Add to dashboard Cite

The objective of this work is to study the ageing state of a used reverse osmosis (RO) membrane taken in Algeria from the Benisaf Water Company seawater desalination unit. The study consists of an autopsy procedure used to perform a chain of analyses on a membrane sheet. Wear of the membrane is characterized by a degradation of its performance due to a significant increase in hydraulic permeability (25%) and pressure drop as well as a decrease in salt retention (10% to 30%). In most cases the effects of ageing are little or poorly known at the local level and global measurements such as (flux, transmembrane pressure, permeate flow, retention rate, etc.) do not allow characterization. Therefore, a used RO (reverse osmosis) membrane was selected at the site to perform the membrane autopsy tests. These tests make it possible to analyze and identify the cause as well as to understand the links between performance degradation observed at the macroscopic scale and at the scale at which ageing takes place. External and internal visual observations allow seeing the state of degradation. Microscopic analysis of the used membranes surface shows the importance of fouling. In addition, quantification and identification analyses determine a high fouling rate in the used membrane whose foulants is of inorganic and organic nature. Moreover, the analyses proved the presence of a biofilm composed of protein.

show abstract

Graphene oxide surface modification of polyamide reverse osmosis membranes for improved N-nitrosodimethylamine (NDMA) removal

Cited by 35 publications

References 50 publications

Novel Bioactive and Antibacterial Acrylic Bone Cement Nanocomposites Modified with Graphene Oxide and Chitosan

Novel Bioactive and Antibacterial Acrylic Bone Cement Nanocomposites Modified with Graphene Oxide and Chitosan

An Organic Chemist’s Guide to N-Nitrosamines: Their Structure, Reactivity, and Role as Contaminants

Characterization of seawater reverse osmosis fouled membranes from large scale commercial desalination plant

Contact Info

Product

Resources

About