Preparation of melamine sponge decorated with silver nanoparticles-modified graphene for water disinfection.
This paper reports the fabrication of melamine sponge decorated with silver nanoparticles-modified graphene (G/AgNPs-MS) for water disinfection. The G/AgNPs-MS composites with the high porosity and elasticity were used in an antibacterial process in which the composite was first immersed in bacterial suspension, and subsequently squeezed via hand compression. G/AgNPs-MS exhibited more excellent bactericidal activity against Escherichia coli and Staphylococcus aureus bacteria compared with melamine sponge (MS), melamine sponge decorated with graphene (G-MS), and melamine sponge decorated with silver nanoparticles (AgNPs-MS). The superior antibacterial effect was possibly ascribed to the coordination of graphene oxide (GO) and silver nanoparticles (Ag NPs). Compared to AgNPs-MS, G/AgNPs-MS displayed better stability with fewer Ag+release. G/AgNPs-MS composites were highly reusable with no significant differences in the loss of bacterial viability over 12 operational cycles. The possible antibacterial mechanism of G/AgNPs-MS was also investigated. It was found that the destruction of bacterial membrane by G/AgNPs-MS played an important role in the bactericidal activity. The generation of intercellular ROS and scavenging assays confirmed the involvement of Ag+and ROS in the antibacterial process of G/AgNPs-MS. All the results demonstrated that the prepared G/AgNPs-MS composites, as innovative antibacterial materials, showed a great potential for water disinfection.
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China.
Can-Hui
CH
Deng
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China. Electronic address: jilaigong@gmail.com.
Ji-Lai
JL
Gong
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China.
Peng
P
Zhang
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China. Electronic address: zgming@hnu.edu.cn.
Guang-Ming
GM
Zeng
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China.
Biao
B
Song
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China.
Hong-Yu
HY
Liu
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D002462:Cell Membrane / Q000737:chemistry / Q000187:drug effects; D004203:Disinfection / Q000379:methods*; D004548:Elasticity; D017743:Equipment Reuse; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D006108:Graphite / Q000737:chemistry / Q000494:pharmacology; D053768:Metal Nanoparticles; D008826:Microbial Sensitivity Tests; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D010087:Oxides; D016062:Porosity; D017382:Reactive Oxygen Species / Q000819:agonists / Q000378:metabolism; D012834:Silver / Q000737:chemistry / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D014227:Triazines / Q000737:chemistry / Q000494:pharmacology*; D014867:Water / Q000737:chemistry; D014871:Water Microbiology
D000900:Anti-Bacterial Agents; D010087:Oxides; D017382:Reactive Oxygen Species; D014227:Triazines; D014867:Water; D012834:Silver; D006108:Graphite; C011907:melamine
Antibacterial; Graphene; Melamine sponge; Reusable; Silver