scholarly journals Studies of Humic Acid Removal from Aqueous Systems by Using Polymeric Membrane Ultrafiltration Process

2018 ◽  
Vol 55 (4) ◽  
pp. 680-685
Author(s):  
Laureniu Tataru ◽  
Valentin Nedeff ◽  
Narcis Barsan ◽  
Emilian Mosnegutu ◽  
Mirela Panainte Lehadus ◽  
...  
Keyword(s):  
Humic Acid ◽  
High Efficiency ◽  
Negative Impact ◽  
Retention Rate ◽  
Polymeric Membranes ◽  
Impact Testing ◽  
Polymeric Membrane ◽  
Aqueous Systems ◽  
Influence Of Process Parameters ◽  
Ultrafiltration Process

This paper proposes to investigate in detail the behavior of polymeric membranes ultrafiltration process uses in the retention of humic acid from aqueous systems. Nowadays, the aqueous systems (contaminated water and/or wastewater) resulting from various domestic and industrial activities contain many contaminants, some of them increasingly dangerous to the environment. Laboratory testing of membranes in the ultrafiltration process as well as their experimentation with different chemical compounds is essential because it is important to know how they can be eliminated before they cause a negative impact. Testing of polymeric membranes consists in carrying out the process of ultrafiltration of aqueous systems containing humic acid over a set time, following the variation in time of the volume of permeate obtained as well as the influence of process parameters. Following the investigation of the ultrafiltration process of the water through the polymeric membrane, it was found that the formation of the humic acid layer on the surface of the membrane that favors fouling is delayed, after many hours of operation, due to both the internal fiber structure which offers advantages to this type of membranes as well as high efficiency of humic acid retention. Experimental results showed that the humic acid retention rate increased by up to 37% as a result of the double decrease of the conductivity value in the permeate samples from about 600 mS/cm to 373 mS/cm and the temperature being continuously increasing, from 22.5 at 25oC over 5 h influenced the entire ultrafiltration process. The full process approach as well as the expression and interpretation of the results will be detailed in this paper.

scholarly journals Influence of Casting Solvents on CO2/CH4 Separation Using Polysulfone Membranes

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 286
Author(s):  
Roba M. Almuhtaseb ◽  
Ahmed Awadallah-F ◽  
Shaheen A. Al-Muhtaseb ◽  
Majeda Khraisheh
Keyword(s):  
High Efficiency ◽  
In Situ Synthesis ◽  
Separation Process ◽  
Polymeric Membranes ◽  
Gas Mixture ◽  
Manufacturing Cost ◽  
Binary Gas Mixture ◽  
Maximum Permeability ◽  
Polysulfone Membranes

Polysulfone membranes exhibit resistance to high temperature with low manufacturing cost and high efficiency in the separation process. The composition of gases is an important step that estimates the efficiency of separation in membranes. As membrane types are currently becoming in demand for CO2/CH4 segregation, polysulfone will be an advantageous alternative to have in further studies. Therefore, research is undertaken in this study to evaluate two solvents: chloroform (CF) and tetrahydrofuran (THF). These solvents are tested for casting polymeric membranes from polysulfone (PSF) to separate every single component from a binary gas mixture of CO2/CH4. In addition, the effect of gas pressure was conducted from 1 to 10 bar on the behavior of the permeability and selectivity. The results refer to the fact that the maximum permeability of CO2 and CH4 for THF is 62.32 and 2.06 barrer at 1 and 2 bars, respectively. Further, the maximum permeability of CF is 57.59 and 2.12 barrer at 1 and 2 bars, respectively. The outcome selectivity values are 48 and 36 for THF and CF at 1 bar, accordingly. Furthermore, the study declares that with the increase in pressure, the permeability and selectivity values drop for CF and THF. The performance for polysulfone (PSF) membrane that is manufactured with THF is superior to that of CF relative to the Robeson upper bound. Therefore, through the results, it can be deduced that the solvent during in-situ synthesis has a significant influence on the gas separation of a binary mixture of CO2/CH4.

scholarly journals The Long-Lasting Story of One Sensor Development: From Novel Ionophore Design toward the Sensor Selectivity Modeling and Lifetime Improvement

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1401
Author(s):  
Larisa Lvova ◽  
Donato Monti ◽  
Corrado Di Natale ◽  
Roberto Paolesse
Keyword(s):  
Anion Exchanger ◽  
Specific Interaction ◽  
Spectroscopic Studies ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Active Components ◽  
Nitrite Ion ◽  
Working Mechanism ◽  
Axial Coordination ◽  
Porphyrin Aggregation

The metalloporphyrin ligand bearing incorporated anion-exchanger fragment, 5-[4-(3-trimethylammonium)propyloxyphenyl]-10,15,20-triphenylporphyrinate of Co(II) chloride, CoTPP-N, has been tested as anion-selective ionophore in PVC-based solvent polymeric membrane sensors. A plausible sensor working mechanism includes the axial coordination of the target anion on ionophore metal center followed by the formed complex aggregation with the second ionophore molecule through positively charged anion-exchanger fragment. The UV-visible spectroscopic studies in solution have revealed that the analyte concentration increase induces the J-type porphyrin aggregation. Polymeric membranes doped with CoTPP-N showed close to the theoretical Nernstian response toward nitrite ion, preferably coordinated by the ionophore, and were dependent on the presence of additional membrane-active components (lipophilic ionic sites and ionophore) in the membrane phase. The resulting selectivity was a subject of specific interaction and/or steric factors. Moreover, it was demonstrated theoretically and confirmed experimentally that the selection of a proper ratio of ionophore and anionic additive can optimize the sensor selectivity and lifetime.

The Impacts of Traffic Noise on House Renting and Selling Prices Concerning Residential Areas Case of Sulaimaniyah City Center

2021 ◽  
Author(s):  
Ayoub Smaqaey ◽  
◽  
Mohammed AbdulKareem ◽  
Meryem Komşu ◽  
◽  
...  
Keyword(s):  
Real Estate ◽  
High Efficiency ◽  
Negative Impact ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Real Estate Market ◽  
Residential Areas ◽  
City Center ◽  
The Government ◽  
The Impact

The purposes of this research are to examine the impact of traffic noise on the sale and rent prices of the housing real estate in the Sulaimaniyah city center. Besides, highlight the concept of traffic noise pollution in general and in particular in the Sulaimaniyah city center. Thus, people have the right to choose the nature of the acoustic environment, as others should not impose it, the problem of traffic noise considered as one of the main problems that have imposed on the people in Sulaimaniyah city center. Which began to take severe economic and social dimensions, affects the decision-making process in the real estate market. Moreover, consequently, this research analyzes the impact of traffic noise pollution in the sale and rent prices of residential property in Sulaimaniyah city center, the results of the research have confirmed a clear and negative impact the traffic noise on residential real estate prices in Sulaimaniyah city center. Finally, the research indorsed range of important recommendations, such as necessity control the noise pollution at the level of governments and companies, either at the companies’ level by choosing vehicles that release less sound and the use of sound control devices of high efficiency. Either at the government level to determine the volume level or prevent annoying noises (painful), through legislation and laws of environmental protection and impose fees and raise awareness.

Deposition of Dopamine and Polyethyleneimine on Polymeric Membranes: Improvement of Performance of Ultrafiltration Process

2020 ◽  
Vol 28 (12) ◽  
pp. 1091-1097
Author(s):  
Ingrid R. Marques ◽  
Guilherme Zin ◽  
Lidia T. Prando ◽  
Cristiana C. Bretanha ◽  
Mariane C. Proner ◽  
...  
Keyword(s):  
Polymeric Membranes ◽  
Ultrafiltration Process

Effects of Ionic Liquid Blending in Polymeric Membrane: Physical Properties and Performance Evaluation

2014 ◽  
Vol 625 ◽  
pp. 680-684 ◽  
Author(s):  
Dzeti Farhah Mohshim ◽  
Hilmi Mukhtar ◽  
Zakaria Man
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Membrane Separation ◽  
Initial Study ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Separation Performance ◽  
Operating Pressure ◽  
Membrane Gas Separation ◽  
Pes Membrane

— Polymeric membranes have been extensively used in membrane gas separation process. Nowadays, peoples are modifying the membrane by many ways like coating with ionic liquids to further enhance the membrane separation performance. In this project, ionic liquid modified polymeric membranes (ILMPM) have been successfully developed by blending the ionic liquids with the polymer via solvent evaporation method. The ionic liquid used was 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide, ([emim][Tf2N]) and for comparison purpose, the compositions were varied at 10 and 20 wt/wt%. In general, the blending of [emim][Tf2N] and PES has produced dense membrane with miscible mixture without any phase separation. It was observed that, the CO2permeance of ILMPM has been improved about 271% as compared to the pure PES membrane. However, the CO2permeance decreased with increasing operating pressure, yet the ILMPM CO2permeance still higher than CO2permeance of pure PES membrane. In addition, the CO2/CH4separation performance has greatly increased about 162% as the IL composition is increased. This initial study has proven that IL helps to enhance of CO2permeation and improve selectivity.

scholarly journals Vehicular Ad hoc Network for Intelligent Transport System: A review

2018 ◽  
Vol 7 (4.36) ◽  
pp. 350
Author(s):  
Mohammed Saad Talib ◽  
Aslinda Hassan ◽  
Burairah Hussin ◽  
Ali Abdul-Jabbar Mohammed ◽  
Ali Abdulhussian Hassan ◽  
...  
Keyword(s):  
Traffic Safety ◽  
Intelligent Transportation Systems ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
High Efficiency ◽  
New Technologies ◽  
Negative Impact ◽  
Transportation Systems ◽  
Transport Systems ◽  
Intelligent Transport System

the numbers of accidents are increasing in an exponential manner with the growing of vehicles numbers on roads in recent years.  This huge number of vehicles increases the traffic congestion rates. Therefore, new technologies are so important to reduce the victims in the roads and improve the traffic safety. The Intelligent Transportation Systems (ITS) represents an emerging technology to improve the road's safety and traffic efficiency. ITS have various safety and not safety applications. Numerous methods are intended to develop the smart transport systems. The crucial form is the Vehicular Ad hoc Networks (VANET). VANET is becoming the most common network in ITS. It confirms human’s safety on streets by dissemination protection messages among vehicles. Optimizing the traffic management operations represent an urgent issue in this era a according to the massive growing in number of circulating vehicles, traffic congestions and road accidents. Street congestions can have significant negative impact on the life quality, passenger's safety, daily activities, economic and environmental for citizens and organizations. Current progresses in communication and computing paradigms fetched the improvement of inclusive intelligent devices equipped with wireless communication capability and high efficiency processors.  

Effect of Plasma Treatment on Surface Properties of Polymeric Membrane

2012 ◽  
Vol 585 ◽  
pp. 528-531 ◽  
Author(s):  
Awatif Saber Jasim ◽  
Khalaf Ibrahim Khaleel ◽  
Muhamad Abdul Kareem Ahmed ◽  
Y.K. Vijay ◽  
Sachin Surve
Keyword(s):  
Plasma Treatment ◽  
Surface Properties ◽  
Vacuum Chamber ◽  
High Vacuum ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Nitrogen Gas ◽  
Vis Spectroscopy ◽  
Solution Cast ◽  
Solution Cast Method

In the present work the effect of plasma treatment has been used to improve the surface properties of polymeric membranes. The polymeric membranes of polycarbonate (PC) were synthesized using solution cast method. The plasma treatment was done in high vacuum chamber using nitrogen gas and the pressure for the plasma treatment was » 10-2 mbar. The effect of plasma treatment on surface properties like morphology, roughness, wettability and optical properties has been characterized using optical microscopy and UV-Vis spectroscopy for different time of plasma treatment.

Reducing the negative impact of changes in space weather on human condition

2019 ◽  
pp. 236-239
Author(s):  
E. V. Martysh
Keyword(s):  
Human Body ◽  
Space Weather ◽  
Geomagnetic Field ◽  
High Efficiency ◽  
Negative Impact ◽  
The State ◽  
Human Condition ◽  
Physical Factors ◽  
Plasma Medicine ◽  
The Earth

In the article, based on the analysis of the physical factors responsible for the parameters of space weather near the Earth, possible ways of influence of the geomagnetic field disturbances on the state of the human body and methods of untraditional medicine to prevent the negative impact of such disturbances, the conclusions about the possibility of using acupuncture in the prevention and elimination of such influence are made. and the ability to use plasma medicine to address these problems with high efficiency.

A Review on Glassy Polymeric Membranes for Gas Separation

2014 ◽  
Vol 625 ◽  
pp. 701-703 ◽  
Author(s):  
Marjan Farnam ◽  
Hilmi Mukhtar ◽  
Azmi Mohd Shariff
Keyword(s):  
Gas Separation ◽  
Upper Bound ◽  
Review Paper ◽  
Glassy Polymer ◽  
Polymer Membranes ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Trade Off

Polymeric membranes are widely used for gas separation purposes but their performance is restricted by the upper bound trade-off discovered by Robeson in 1991. The polymeric membrane can be glassy, rubbery or a blend of these two polymers. This review paper discusses the properties of glassy polymer membranes and their performance in gas separation. The area of improvement for glassy membrane with development of mixed matrix membrane is also highlighted.

Highly Hg2+-sensitive and selective fluorescent sensors in aqueous solution and sensors-encapsulated polymeric membrane

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10401-10411 ◽  
Author(s):  
Sasiwimon Kraithong ◽  
Pattareeya Damrongsak ◽  
Kullatat Suwatpipat ◽  
Jitnapa Sirirak ◽  
Pattanawit Swanglap ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Detection Limits ◽  
High Sensitivity ◽  
Fluorescent Sensors ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Sensitivity And Selectivity

The sensors in solutions and sensors encapsulated polymeric membranes exhibited high sensitivity and selectivity for Hg2+ detection, with detection limits of 0.2–49 ppb.

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