scholarly journals Emissive Organogel Mediated Construction of Hydrazide Linked Flexible Covalent Organic Polymer for the Separation of Aniline for Water Purification

2021 ◽  
Author(s):  
Apurba K. Das ◽  
Sayan Maiti ◽  
Tapas Ghosh ◽  
Arati Samal
Keyword(s):  
Water Purification ◽  
Organic Polymer

scholarly journals Emissive Organogel Mediated Construction of Flexible Covalent Organic Polymer for the Separation of Aniline for Water Purification

2022 ◽  
Author(s):  
Apurba K. Das ◽  
Sayan Maiti ◽  
Tapas Ghosh ◽  
Arati Samal
Keyword(s):  
Water Purification ◽  
Condensation Reaction ◽  
Organic Polymer

A flexible covalent organic polymer (COP) has been successfully synthesized via dynamic covalent gel (DCG) formation through imine condensation reaction between 6-hydrazinonicotinic hydrazide hydrate and benzene-1,3,5-tricarboxaldehyde within 7 min under...

scholarly journals The impact of zeta potential changes on Ceratium hirundinella cell removal and the ability of cells to restore its natural surface charge during drinking water purification

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22433-22440 ◽  
Author(s):  
H. Ewerts ◽  
S. Barnard ◽  
A. Swanepoel
Keyword(s):  
Drinking Water ◽  
Zeta Potential ◽  
Surface Charge ◽  
Water Purification ◽  
Settling Time ◽  
Organic Polymer ◽  
Source Water ◽  
Ceratium Hirundinella ◽  
Drinking Water Purification ◽  
The Impact

The removal efficacy ofCeratiumcells from source water was evaluated. The best ZP for coagulation were achieved with organic polymer and Ca(OH)2. Cells were able to restore their ZP after 120 and 240 minutes settling time.

scholarly journals Emissive Organogel Mediated Construction of Flexible Covalent Organic Polymer for the Separation of Aniline for Water Purification

2021 ◽  
Author(s):  
Apurba K. Das ◽  
Sayan Maiti ◽  
Tapas Ghosh ◽  
Arati Samal
Keyword(s):  
Binary Mixtures ◽  
Water Purification ◽  
Building Block ◽  
Amorphous Polymer ◽  
Condensation Reaction ◽  
Green Emission ◽  
Ambient Condition ◽  
Organic Polymer ◽  
Aggregation Induced Emission ◽  
Dimethyl Acetamide

A flexible covalent organic polymer (COP) has been successfully synthesized via dynamic covalent gel (DCG) formation through imine condensation reaction between 6-hydrazinonicotinic hydrazide hydrate and benzene-1,3,5-tricarboxaldehyde within 7 min under ambient condition. An emissive organogel mediated protocol has been developed for the construction of amorphous polymer (COP), selectively in N,N-dimethyl acetamide (DMA). Interestingly, two non-emissive building block units without large π-conjugated structures have been engaged for the construction of green emissive COP-gel. The green emission of COP-gel is generated by the intermolecular H-bonding assisted aggregation induced emission phenomenon. The dried COP efficiently adsorbs aniline molecules into its cavities and separate them from binary mixtures of aniline/nitrobenzene and aniline/water, respectively.

Strategies of coagulant optimisation to improve the removal of turbidity and Ceratium hirundinella cells during conventional drinking water purification

2014 ◽  
Vol 14 (5) ◽  
pp. 820-828 ◽  
Author(s):  
H. Ewerts ◽  
S. Barnard ◽  
A. Swanepoel ◽  
H. H. du Preez ◽  
S. Janse van Vuuren
Keyword(s):  
Drinking Water ◽  
Water Purification ◽  
Organic Polymer ◽  
Simultaneous Removal ◽  
Source Water ◽  
Sand Filtration ◽  
Ceratium Hirundinella ◽  
High Concentrations ◽  
Drinking Water Purification ◽  
Purification Plant

The dinoflagellate, Ceratium hirundinella (C. hirundinella) cells are known to cause many problems when source water due for purification contains relatively high concentrations. The objective of this study was to investigate strategies for the effective and simultaneous removal of turbidity and C. hirundinella cells using turbidity and total photosynthetic pigments (TPP) as indicators of appropriate coagulant dosages during conventional drinking water purification. Source water samples with low turbidity, and high number of C. hirundinella cells were collected. A laboratory-scale conventional water purification plant was used to simulate coagulation, flocculation, sedimentation and sand filtration. Various coagulant options were dosed as part of conventional coagulation. The coagulant option Ca(OH)2–organic polymer achieved the best removal of both turbidity (50%) and C. hirundinella cells (75–82%) after sedimentation using TPP as an indicator. Ca(OH)2–SiO2 and organic polymer alone achieved better removal of C. hirundinella (57–75%) and turbidity (33–50%) respectively when TPP was used as an indicator rather than turbidity. Sand filtration removed the remaining turbidity and C. hirundinella cells from the supernatant completely. Implementing new purification strategies may increase treatment costs, but the focus of drinking water purification utilities should always be primarily the production of safe and aesthetically acceptable drinking water.

Effect of Illumination on Organic Polymer Thin-Film Transistors

2003 ◽  
Vol 771 ◽  
Author(s):  
Michael C. Hamilton ◽  
Sandrine Martin ◽  
Jerzy Kanicki
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Drain Current ◽  
Charge Carriers ◽  
Electrical Performance ◽  
Organic Polymer ◽  
Light Illumination ◽  
Polymer Thin Film ◽  
Channel Region ◽  
White Light Illumination

AbstractWe have investigated the effects of white-light illumination on the electrical performance of organic polymer thin-film transistors (OP-TFTs). The OFF-state drain current is significantly increased, while the drain current in the strong accumulation regime is relatively unaffected. At the same time, the threshold voltage is decreased and the subthreshold slope is increased, while the field-effect mobility of the charge carriers is not affected. The observed effects are explained in terms of the photogeneration of free charge carriers in the channel region due to the absorbed photons.

Fouling Is the Beginning: Upcycling Biopolymer-Fouled Substrates for Fabricating High-Permeance Thin-Film Composite Polyamide Membranes

2020 ◽  
Author(s):  
Ruobin Dai ◽  
Hongyi Han ◽  
Tianlin Wang ◽  
Jiayi Li ◽  
Chuyang Y. Tang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Pressure ◽  
End Of Life ◽  
Water Purification ◽  
Low Pressure ◽  
Polymeric Membranes ◽  
Membrane Recycling ◽  
Film Composite ◽  
Thin Film Composite ◽  
First Time

Commercial polymeric membranes are generally recognized to have low sustainability as membranes need to be replaced and abandoned after reaching the end of their life. At present, only techniques for downcycling end-of-life high-pressure membranes are available. For the first time, this study paves the way for upcycling fouled/end-of-life low-pressure membranes to fabricate new high-pressure membranes for water purification, forming a closed eco-loop of membrane recycling with significantly improved sustainability.

DISINFEKSI UNTUK PROSES PENGOLAHAN AIR MINUM

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Nusa Idaman Said
Keyword(s):  
Drinking Water ◽  
Water Purification ◽  
Distribution System ◽  
Residual Effect ◽  
Drinking Water Treatment ◽  
Disinfection Byproducts ◽  
Water Disinfection ◽  
Pathogenic Microorganisms ◽  
Microbiological Contamination ◽  
Disinfection Process

Water disinfection means the removal, deactivation or killing of pathogenic microorganisms. Microorganisms are destroyed or deactivated, resulting in termination of growth and reproduction. When microorganisms are not removed from drinking water, drinking water usage will cause people to fall ill. Chemical inactivation of microbiological contamination in natural or untreated water is usually one of the final steps to reduce pathogenic microorganisms in drinking water. Combinations of water purification steps (oxidation, coagulation, settling, disinfection, and filtration) cause (drinking) water to be safe after production. As an extra measure many countries apply a second disinfection step at the end of the water purification process, in order to protect the water from microbiological contamination in the water distribution system. Usually one uses a different kind of disinfectant from the one earlier in the process, during this disinfection process. The secondary disinfection makes sure that bacteria will not multiply in the water during distribution. This paper describes several technique of disinfection process for drinking water treatment. Disinfection can be attained by means of physical or chemical disinfectants. The agents also remove organic contaminants from water, which serve as nutrients or shelters for microorganisms. Disinfectants should not only kill microorganisms. Disinfectants must also have a residual effect, which means that they remain active in the water after disinfection. For chemical disinfection of water the following disinfectants can be used such as Chlorine (Cl2),  Hypo chlorite (OCl-), Chloramines, Chlorine dioxide (ClO2), Ozone (O3), Hydrogen peroxide etch. For physical disinfection of water the following disinfectants can be used is Ultraviolet light (UV). Every technique has its specific advantages and and disadvantages its own application area sucs as environmentally friendly, disinfection byproducts, effectivity, investment, operational costs etc. Kata Kunci : Disinfeksi, bakteria, virus, air minum, khlor, hip khlorit, khloramine, khlor dioksida, ozon, UV.

ELECTROKINETIC PROPERTIES AND SANITARY-HYGIENIC SAFETY OF WATER BIODISPERSIONS DURING ELECTROPROCESSING

2017 ◽  
pp. 123-126
Author(s):  
S. V. Vorobjeva ◽  
O. V. Smirnov ◽  
V. O. Smirnova ◽  
T. V. Semenova
Keyword(s):  
Water Purification ◽  
Electrokinetic Properties

A correlation between the electrokinetic properties of biodispersion and the possibility of increasing the efficiency of water purification in electroprocessing is shown.

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