Facile fabrication of Tl4HgI6 nanostructures as a novel antibacterial and antibiofilm agent and photocatalyst in degradation of organic pollutants

2021 ◽  
Author(s):  
Maryam Karami ◽  
Mojgan Ghanbari ◽  
Hassan Abbas Alshamsi ◽  
Somaye Rashki ◽  
Masoud Salavati-Niasari
Keyword(s):  
Organic Pollutants ◽  
Stoichiometric Ratio ◽  
Facile Fabrication ◽  
The Impact

In the present study, Tl4HgI6 nanostructures have been successfully fabricated through a simple precipitation route. The impact of TlI stoichiometric ratio to HgI2, and kind of surfactants was explored on...

scholarly journals Facile fabrication of Tl4HgI6 nanostructures as a novel antibacterial and antibiofilm agents

2020 ◽  
Author(s):  
Maryam Karami ◽  
Mojgan Ghanbari ◽  
Omid Amiri ◽  
MASOUD SALAVATI-NIASARI ◽  
Somaye Rashki
Keyword(s):  
Raman Spectroscopy ◽  
Antibacterial Activity ◽  
Bactericidal Activity ◽  
Stoichiometric Ratio ◽  
Raman Spectrometry ◽  
Gram Negative ◽  
Biofilm Production ◽  
Facile Fabrication ◽  
Antibiofilm Agents ◽  
The Impact

Abstract In the present study, Tl4HgI6 nanostructures have been successfully fabricated through a simple precipitation route. The impact of TlI stoichiometric ratio to HgI2, and kind of surfactants was explored on purity, structure, and shape of samples. The as-fabricated Tl4HgI6 was characterized via XRD, EDX, FESEM, TEM, HRTEM, and Raman spectroscopy. Raman spectrometry corroborated the XRD outcomes, and revealed that the Tl4HgI6 nanoparticles were successfully fabricated. The structure, shape, and scale of the products were studied through FESEM images. It was observed that different factors have a notable aspect on the morphology and size of the products. The maximum antibacterial activity of Tl4HgI6 was perceived against S. aureus, E.coli and M. catarils. These outcomes demonstrate that Tl4HgI6 displays efficient bactericidal activity against Gram-positive and Gram-negative microorganisms. The anti-biofilm activity revealed that the best reduction of biofilm was recognized in higher Tl4HgI6 concentrations (2×MIC). Tl4HgI6 at 2×MIC concentration inhibits biofilm production by S. aureus and E. feacalis with an inhibition percentage of 95% and 90%, respectively.

Multiple interactions in riverine biofilms - surfactant adsorption, bacterial attachment and biodegradation

1995 ◽  
Vol 31 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Graham F. White
Keyword(s):  
Organic Pollutants ◽  
Bacterial Attachment ◽  
Solid Surfaces ◽  
Sediment Surface ◽  
Liquid Interfaces ◽  
Polluted Soils ◽  
Biofilm Bacteria ◽  
The Impact ◽  
Multiple Interactions

Many organic pollutants, especially synthetic surfactants, adsorb onto solid surfaces in natural and engineered aquatic environments. Biofilm bacteria on such surfaces make major contributions to microbial heterotrophic activity and biodegradation of organic pollutants. This paper reviews evidence for multiple interactions between surfactants, biodegradative bacteria, and sediment-liquid interfaces. Biodegradable surfactants e.g. SDS, added to a river-water microcosm were rapidly adsorb to sediment surface and stimulated the indigenous bacteria to attach to the sediment particles. Recalcitrant surfactants and non-surfactant organic nutrients did not stimulate attachment Attachment of bacteria was maximal when biodegradation was fastest, and was reversed when biodegradation was complete. Dodecanol, the primary product of SDS-biodegradation, markedly stimulated attachment. When SDS was added to suspensions containing sediment and either known degraders or known non-degraders, only the degraders became attached, and attachment accelerated surfactant biodegradation to dodecanol. These cyclical cooperative interactions have implications for the design of biodegradability-tests, the impact of surfactant adjuvants on biodegradability of herbicides/pesticides formulated with surfactants, and the role of surfactants used to accelerate bioremediation of hydrocarbon-polluted soils.

Facile fabrication of ZnO/MoS2 p-n junctions on Ni foam for efficient degradation of organic pollutants through photoelectrocatalytic process

Solar Energy ◽  
2020 ◽  
Vol 199 ◽  
pp. 164-172 ◽  
Author(s):  
Weihua Fei ◽  
Hongyan Li ◽  
Najun Li ◽  
Dongyun Chen ◽  
Qingfeng Xu ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Ni Foam ◽  
Facile Fabrication

scholarly journals Impact of persistent organic pollutants sources on the ecological state of the environment

2019 ◽  
pp. 72-76
Author(s):  
T.I. Висоцька ◽  
Т.В. Пічкур
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
State Level ◽  
Negative Influence ◽  
Health Maintenance ◽  
World Community ◽  
Soil Ecosystems ◽  
Long Time ◽  
State Of The Environment ◽  
The Impact

The article studies the impact of persistent organic pollutants (POPs) on the environment. POPs are artificial substances for the environment. Nowadays, scientists have created more than 18 million chemical compounds, almost 100 000 of which are used in industry. It is widely understood that the pollution of the environment by persistent organic pollutants is due to their constant movement between the natural envelopes. Environmental studies show that regardless of sources (POPs) all the components of the biosphere are under their negative influence: surface water and groundwater, atmosphere, soil ecosystems, flora, and fauna. Measures that can be taken to prevent and reduce the impact of POPs on human health are conventionally divided into measures applied at the state level, and measures for the health maintenance, which should be used by each person, possessing certain knowledge about potential sources and properties of persistent organic pollutants. Considering the fact that POPs can remain in the environment for a long time, there is only one way to protect ourselves and future generations – it is to stop the production and use of POPs and to stop those production processes that use POPs. But this requires the efforts of the world community.

Anticipating the impact of pitfalls in kinetic biodegradation parameter estimation from substrate depletion curves of organic pollutants

2019 ◽  
Vol 252 ◽  
pp. 128-136 ◽  
Author(s):  
Laura Escuder-Gilabert ◽  
Yolanda Martín-Biosca ◽  
Salvador Sagrado ◽  
María José Medina-Hernández
Keyword(s):  
Parameter Estimation ◽  
Organic Pollutants ◽  
The Impact

Impact of ‘Organic' Pollutants on Coastal Waters, Gulf of Trieste

1986 ◽  
Vol 18 (9) ◽  
pp. 57-68 ◽  
Author(s):  
R. Olivotti ◽  
J. Faganeli ◽  
A. Malej
Keyword(s):  
Organic Pollutants ◽  
Coastal Waters ◽  
Sewage Treatment ◽  
Water Quality Standards ◽  
Gulf Of Trieste ◽  
Satisfactory Condition ◽  
Bathing Waters ◽  
Treatment And Disposal ◽  
The Impact

The main sources of potential ‘organic' pollutants (essentially pathogens, nutrients, floatables, suspended solids and detergents) discharged to the Gulf of Trieste by sewers and rivers are briefly reviewed; about 470,000 people live in the coastal area, and nearly 400,000 of them discharge sewage effluents to the Gulf. This brief review is followed by an evaluation of the impact of such discharges on the quality of marine waters, with reference to the impairment of uses such as bathing and shellfish cultivation. The sanitary and aesthetic aspects of faecal pollution which typically affect coastal waters are examined together with the water quality standards pertaining to bathing waters and shellfish cultivation areas; the extent of pollution of the coastal waters is determined. Experience gained at some wastewater treatment and disposal works is cited. On the whole, the Gulf of Trieste appears to be in a satisfactory condition: more than 85% of the shoreline (totalling 42 km in Yugoslavia and 93 km in Italy) is unpolluted, according to the pertaining standards. Ameliorations are, however, urgently needed in many respects. Recommendations regarding adequate forms of sewage treatment and disposal are made.

scholarly journals Modelling the impact of climate change on the atmospheric transport and the fate of persistent organic pollutants in the Arctic

2015 ◽  
Vol 15 (11) ◽  
pp. 6549-6559 ◽  
Author(s):  
K. M. Hansen ◽  
J. H. Christensen ◽  
C. Geels ◽  
J. D. Silver ◽  
J. Brandt
Keyword(s):  
Climate Change ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Atmospheric Transport ◽  
Climate Scenario ◽  
The Arctic ◽  
Model Studies ◽  
Environmental Concentrations ◽  
Mean Temperature ◽  
The Impact

Abstract. The Danish Eulerian Hemispheric Model (DEHM) was applied to investigate how projected climate changes will affect the atmospheric transport of 13 persistent organic pollutants (POPs) to the Arctic and their environmental fate within the Arctic. Three sets of simulations were performed, one with present day emissions and initial environmental concentrations from a 20-year spin-up simulation, one with present day emissions and with initial environmental concentrations set to zero and one without emissions but with initial environmental concentrations from the 20-year spin-up simulation. Each set of simulations consisted of two 10-year time slices representing the present (1990–2000) and future (2090–2100) climate conditions. DEHM was driven using meteorological input from the global circulation model, ECHAM/MPI-OM, simulating the SRES (Special Report on Emissions Scenarios) A1B climate scenario. Under the applied climate and emission scenarios, the total mass of all compounds was predicted to be up to 55 % lower across the Northern Hemisphere at the end of the 2090s than in the 1990s. The mass of HCHs within the Arctic was predicted to be up to 38 % higher, whereas the change in mass of the PCBs was predicted to range from 38 % lower to 17 % higher depending on the congener and the applied initial environmental concentrations. The results of this study also indicate that contaminants with no or a short emission history will be more rapidly transported to and build up in the arctic environment in a future warmer climate. The process that dominates the environmental behaviour of POPs in the Arctic under a future warmer climate scenario is the shift in mass of POPs from the surface media to the atmosphere induced by the higher mean temperature. This is to some degree counteracted by higher degradation rates also following the higher mean temperature. The more dominant of these two processes depends on the physical-chemical properties of the compounds. Previous model studies have predicted that the effect of a changed climate on the transport of POPs to the Arctic is moderate relative to the effect of proposed changes in emissions, which is confirmed in this study. However, the model studies do not agree on whether climate change acts to reduce or increase environmental concentrations of POPs in the Arctic, and further work is needed to resolve this matter.

Analysis of Requirements for Effluent Quality and their Impact on Status of Rivers

2017 ◽  
Author(s):  
Regimantas Dauknys ◽  
Aušra Mažeikienė
Keyword(s):  
Organic Pollutants ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Good Condition ◽  
Ecological Status ◽  
Treated Wastewater ◽  
Effluent Quality ◽  
Lithuanian Rivers ◽  
The Impact

The article analyses Lithuanian rivers, 32 of which have been selected as non-complying with the require-ments of good condition. Furthermore, 15 discharge facilities that discharge wastewater to the aforementioned rivers from agglomerations with population equivalent (PE) greater than 2,000 have been selected. The assessment of the quality of treated wastewater according to the allowable impact on the reception facility has been carried out and has been compared with the currently regulated minimum allowable values of concentrations of pollutants. The analysis of the impact of quality of treated wastewater on the ecological status of rivers has been presented. It has been established that the pollution of rivers would be decreased by an average 8% (organic pollutants and total nitrogen) and by 22% (total phosphorus), if the allowable concentrations of pollutants according to the impact on the reception facility were ensured in the analysed treatment plants with PE greater than 10,000.

Sign in / Sign up

Export Citation Format

Share Document