Treatment of Micro-Polluted Surface Water by the Nanomaterials Modified PVDF Ultrafiltration Membrane

2011 ◽  
Vol 243-249 ◽  
pp. 4788-4792
Author(s):  
Jian Zhan ◽  
Na Mei ◽  
Zhan Li Chen ◽  
Xiao Hua Huang
Keyword(s):  
Surface Water ◽  
Original Film ◽  
In Situ Polymerization ◽  
Removal Rate ◽  
Membrane Surface ◽  
Ammonium Persulfate ◽  
Ammonia Nitrogen ◽  
Ultrafiltration Membrane ◽  
Uf Membranes

The PVDF ultrafiltration membrane was modified by step in situ polymerization coupled with TiO2-PANI membrane surface modifying. It has been prepared by different oxidants, such as ammonium persulfate (APS) and ferric chloride (FeCl3). Meanwhile, application of the modified PVDF ultrafiltration membrane on treating micro-polluted surface water was studied. Turbidity removal efficiency, organic compounds and ammonia nitrogen (NH3-N) were mainly concerned. The results show that the modified PVDF UF membranes can remove 95% turbidity, UV254higher than 50% which was increased greater than the original film. When FeCl3was taken as oxidant with 0.03mol/L, less by-product, NH4+, was generated than APS. Thus, the ammonia nitrogen removal rate is as high as 85.2% and is 20% more than the original film.

Molecular‐Sieving Membrane by Partitioning the Channels in Ultrafiltration Membrane by In Situ Polymerization

2020 ◽  
Vol 59 (11) ◽  
pp. 4401-4405 ◽  
Author(s):  
Pengpeng Shao ◽  
Ruxin Yao ◽  
Ge Li ◽  
Mengxi Zhang ◽  
Shuai Yuan ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Ultrafiltration Membrane ◽  
Molecular Sieving

In Situ Fabrication of Nanoscale Graphene Oxide/Polyaniline Composite and its Electrochemical Properties

2010 ◽  
Vol 148-149 ◽  
pp. 1547-1550 ◽  
Author(s):  
Hua Lan Wang ◽  
Qing Li Hao ◽  
Xi Feng Xia ◽  
Zhi Jia Wang ◽  
Jiao Tian ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Polymerization Process ◽  
Electrochemical Test ◽  
X Ray ◽  
Transmission Electron

A graphene oxide/polyaniline composite was synthesized by an in situ polymerization process. This product was simply prepared in an ethylene glycol medium, using ammonium persulfate as oxidant in ice bath. The composite was characterized by field emission scanning electron microscopy, transmission electron microscopy, X-Ray photoelectron spectroscopy, Raman spectroscopy and electrochemical test. The composite material showed a good electrochemical performance.

Properties of Polyaniline with the Doping of Different Acid

2012 ◽  
Vol 502 ◽  
pp. 31-35 ◽  
Author(s):  
Xiao Hua Wang
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Acid Content ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Dodecylbenzenesulfonic Acid ◽  
Thermal Stability Of

Polyaniline(PANI) with the doping of hydrochloride(HC1), aminosulfonic acid (NH2SO3H) or dodecylbenzenesulfonic acid(DBSA) was prepared by in-situ polymerization. Effects of acid content, reaction time, oxidant ammonium persulfate (APS) dosage and reaction temperature on the conductivity of PANI were studied. The resistance and thermal stability of them were compared. Results show that the largest conductivity of HC1-PANI is 1.98 s.cm-1 among them in case the C(HC1)=0.5mol/L, reaction time is 6.0h, n(APS/aniline)=1.0; The conductivity of NH2SO3H-PANI is 0.2s.cm-1 in case the C(NH2SO3H)=1.0mol/L, reaction time is 6.0h, n(APS/aniline)=2.0; The conductivity of DBSA-PANI is 0.98s.cm-1 in case the C(DBSA)=1.0 mol/L, reaction time is 8.0h, n(APS/aniline) = 2.0. The the least resistance of HC1-PANI is 10Ω, and that of NH2SO3H- PANI is the largest of 120Ω. The order of their thermal stability is DBSA-PANI > NH2SO3H-PANI > HC1-PANI before 350°C, that of their thermal stability is inverse when it reaches 350°C.

The Bentonite Copolymer Composite for Removing Lead Ions

2013 ◽  
Vol 750-752 ◽  
pp. 47-50
Author(s):  
Wen Juan He ◽  
Yu Feng He ◽  
Zhen Hua Zhang ◽  
Ju Hua Guo ◽  
Rong Min Wang
Keyword(s):  
Kinetic Model ◽  
Maleic Anhydride ◽  
In Situ Polymerization ◽  
Removal Rate ◽  
Order Kinetic ◽  
Adsorption Dynamics ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Polymer Adsorbent

In this paper, a new kind of clay copolymer adsorbent, bentonite compositing with maleic anhydride (MAH)-acrylic acid (AA)-vinyl acetate (VAc) copolymer (NaB/PMAV) was prepared by in-situ polymerization. It was used as polymer adsorbent for removing Pb (II) ions in wastewater.. Under the optimal condition of adsorption, the removal rate reached to 94.4% and the adsorption capacity got to 235.9 mg/g. Adsorption dynamics were consistent with pseudo-second-order kinetic model and isotherm model can meet the Langmuir isotherm.

Preparation and characterization of microcapsules containing ammonium persulfate as core by in situ polymerization

2014 ◽  
Vol 249 ◽  
pp. 27-33 ◽  
Author(s):  
Mingming Zuo ◽  
Tianqing Liu ◽  
Jingjing Han ◽  
Yuanchun Tang ◽  
Feng Yao ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Ammonium Persulfate

The Study of the Fluorescence In Situ Hybridization Applied in the Denitrifying Bacteria on Metal Membrane Bioreactor’s Denitrification Tank

2011 ◽  
Vol 317-319 ◽  
pp. 250-253
Author(s):  
Pan Zhang ◽  
Lei Chen
Keyword(s):  
Membrane Bioreactor ◽  
Removal Rate ◽  
Denitrifying Bacteria ◽  
Ammonia Nitrogen ◽  
Nitrifying Bacteria ◽  
Active Sludge ◽  
Metal Membrane ◽  
The Relationship ◽  
Plate Type

In order to study changes in the quantity of different denitrifying bacteria during the process of the metal membrane bioreactor, and to determine the relationship between different types of bacteria’s quantity and the treating water quality, the fluorescence in situ hybridization (FISH) dominant molecular biological technologies were used in this study to explore different denitrifying bacteria populations in the active sludge in the denitrification tank on the immersed plate-type metal membrane bioreactor. The study result implies that the addition involvement of the denitrification tank is enormous beneficial to the growth of all bacteria and nitrifying bacteria, meanwhile the removal rate of total nitrogen and ammonia nitrogen is improved as well.

scholarly journals In-Situ Preparation of Conducting Polymers/Copper (II)-Maghnite Clay Nanocomposites

2017 ◽  
Vol 14 (2) ◽  
pp. 204-211 ◽  
Author(s):  
Fatima Zeggai ◽  
Mohammed Belbachir ◽  
Aicha Hachmaoui
Keyword(s):  
Conducting Polymers ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Preparation ◽  
Ft Ir ◽  
The Fourier Transform

In this work we report a simple way for the conducting polymer nanocomposites synthesis using on algerian hydrophilic natural Montmorillonite (MMT) nanoclay named Maghnite (Mag) as dopant. The electrochemical properties study of the following conducting polymers: poly(4-aminobenzylamine) (P4ABA) and polyaniline (PANI) nanocomposites with copper maghnite (Mag-Cu) were successfully prepared by In-Situ polymerization, in presence of inorganic nanolayers of clay, and oxidizing agent ammonium persulfate. The synthesis of copolymers was developed at different feed mole fractions of monomer. The products were characterized by the Fourier transform Infrared (FT-IR), the ultraviolet-visible (UV–vis) spectroscopies and X-ray diffraction (XRD). The results showed that the in-situ polymerization produced real nanocomposites containing aniline and 4-aminobenzylamine units.

scholarly journals Performance of integrated sequencing batch reactor (SBR) and reverse osmosis (RO) process for leachate treatment: effect of pH

2022 ◽  
Author(s):  
Izabela Anna Tałałaj
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Removal Rate ◽  
Membrane Surface ◽  
Ammonia Nitrogen ◽  
Electrostatic Repulsion ◽  
Permeate Flux ◽  
Leachate Treatment ◽  
Good Efficiency

Abstract Purpose In this paper the performance and effectiveness of the reverse osmosis (RO) process for the biologically pretreated leachate was investigated. The RO process was carried out separately for two different pH: 8.0 and 9.3. Methods A general pollution parameters as well as organic and inorganic indicators were determined in raw, biologically pretreated and RO treated leachate. The performance characteristics of the reverse osmosis system were made on the basis of permeate flux, electroconductivity removal rate, concentration factor and efficiency in removal of analyzed parameters. Results The use of SBR pretreatment had very good efficiency in BOD (97.3%) and ammonia nitrogen (95.4%) removal. The lowest effectivity was observed for chloride (11.6%), boron (3.9%) and TDS (1.2%). Pretreated leachate was subjected to RO system. The normalized average flux was 0.53 (42.3 L/m2·h) for pH = 8.0 and 0.68 (33.5 L/m2·h) for pH = 9.3. The lower membrane fouling at higher pH can be explained by electrostatic repulsion between the negatively charged membrane surface and organic substances. Independently of the process pH, a two-step membrane fouling was observed. The greatest differences in removal rates were observed for boron, which had a higher retention rate at higher pH, and ammonia nitrogen, whose removal rate decreased at higher pH. The obtained permeate pH after RO process was lower than the feed pH in two analyzed value of pH. Conclusions The higher flux value at pH = 9.3 is result of high content of organic matter in leachate, which is better rejected at higher pH because of higher electrostatic repulsion between organic matter and membrane surface. This indicates that the organic matter content should be taken into account when determining the operating parameters (pH values) of the RO system.

scholarly journals Synthesis and Characterization of Polypyrrole (PPy) by In-situ Polymerization Technique

2020 ◽  
Vol 6 (2) ◽  
pp. 686-688
Author(s):  
Phalak Mrunalini ◽  
Rajendra Waghulade ◽  
Yogesh Toda
Keyword(s):  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Powder ◽  
Infra Red ◽  
Granular Morphology

This work reports synthesize of polypyrrole nano powder by chemical in-situ polymerization of pyrrole in aqueous solution and ammonium persulfate solution which acts as oxidant. It is characterized by X-ray diffraction (XRD), Fourier infra-red spectroscopy (FTIR) and scanning electron microscopy (SEM). The XRD spectrum reveals that the materials are amorphous in nature. FTIR analysis confirms that all peaks are the main characteristic of PPy. SEM analysis showed that the powder has a uniform granular morphology and the size varies from ∼500 nm to 1 μm. The micrograph of polypyrrole reveals the presence of globular particles. The formed particles are irregular in nature. The results show that the fibers are chemically formed as spherical nanostructures.

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