Antimicrobial and antifouling properties of versatile PPSU/carboxylated GO nanocomposite membrane against Gram-positive and Gram-negative bacteria and protein.
Arun Kumar ShuklaJaved AlamMohammad Azam AnsariMansour AlhoshanFekri Abdulraqeb Ahmed AliPublished in: Environmental science and pollution research international (2018)
Biofouling is a serious issue in membrane-based water and wastewater treatment as it critically compromises the efficacy of the water treatment processes. This investigation demonstrates the antimicrobial and antifouling properties of a nanocomposite membrane system composed of carboxyl-functionalized graphene oxide (COOH-GO) and polyphenylsulfone (PPSU). The PPSU/COOH-GO nanocomposite membrane exhibited excellent antimicrobial properties, achieving maximum bacteriostasis rates of 74.2% and 81.1% against the representative Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa, respectively) and 41.9% against the representative Gram-positive bacterium (Staphylococcus aureus). The PPSU/COOH-GO nanocomposite membrane inhibited the attachment, colonization, and the biofilm formation of three species. Antifouling was assessed through filtration experiments using a model foulant bovine serum albumin (BSA). The fouling mechanisms were investigated by Hermia's models (complete blocking, intermediate blocking, standard blocking, and cake formation), and the analysis involved fitting the volumetric flux decline experimental data to models. The fouling study revealed a less irreversible fouling and increased flux recovery ratio for the PPSU/COOH-GO nanocomposite membrane. Complete blocking of pores and cake formation were the major fouling mechanisms for the membrane.
Keyphrases
- staphylococcus aureus
- biofilm formation
- pseudomonas aeruginosa
- escherichia coli
- wastewater treatment
- quantum dots
- reduced graphene oxide
- candida albicans
- gram negative
- carbon nanotubes
- small molecule
- cross sectional
- multidrug resistant
- visible light
- highly efficient
- electronic health record
- smoking cessation
- klebsiella pneumoniae
- drug resistant
- high resolution
- acinetobacter baumannii