Name: synthesis of hydrogels with antifouling properties as membranes for water purification
Uploaded: 2017-04-07T14:00:00
Description: Watch this Scientific Journal Video about Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification at JoVE.com

We gratefully acknowledge the financial support of this work by the Korean Carbon Capture and Sequestration R&amp;D Center (KCRC).

1. Preparation of the Prepolymer Solutions
<ol>
	<li>Preparation using water as a solvent
	<ol>
		<li>Add 10.00 g of deionized (DI) water to a glass bottle with a magnetic stir bar.</li>
		<li>Measure 2.00 g of SBMA and transfer it to the glass bottle containing the water. Stir the solution for 30 min, until the SBMA is completely dissolved.</li>
		<li>In a separate bottle, add 20.00 g of PEGDA (Mn = 700 g/mol).</li>
		<li>Add 20.0 mg of 1-hydroxycyclohexyl phenyl ketone (HCPK), a photo-init...

<ol>
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We have demonstrated a facile method to prepare freestanding films and impregnated membranes based on zwitterionic hydrogels. The disappearance of three (meth)acrylate characteristic peaks (i.e., 810, 1,190, and 1,410 cm-1) in the IR spectra of the obtained polymer films and impregnated membrane (Figure 2) indicates the good conversion of the monomers and crosslinker4,19,21. Additionally, the...

There is a great need to develop low cost and energy efficient technologies to produce clean water in order to meet the increasing demand. Polymeric membranes have emerged as a leading technology for water purification due to their inherent advantages, such as their high energy efficiency, low cost, and simplicity in operation1. Membranes allow pure water to permeate through and reject the contaminants. However, membranes are often subjected to fouling by contaminants in the feed water, which can be adsorbed onto the membrane surface from their favorable interactions2,3. The fouling can dramatically decrease water flux through the membranes, increasing the membrane area required and the cost of water purification.
An effective approach to mitigate fouling is to modify the membrane surface to increase the hydrophilicity and thus decrease the favorable interactions between the membrane surface and foulants. One method is to use thin-film coating with superhydrophilic3 hydrogels. The hydrogels often have high water permeability; therefore, a thin-film coating can increase the long-term water permeance through the membrane due to the mitigated fouling, despite the slightly increased transport resistance across the whole membrane. The hydrogels can also be directly fabricated into impregnated membranes for water purification in osmotic applications4.
Zwitterionic materials contain both positively and negatively charged functional groups, with a net neutral charge, and have strong surface hydration through electrostatic-induced hydrogen bonding5,6,7,8,9. The tightly bound hydration layers act as physical and energy barriers, preventing foulants from attaching onto the surface, thus demonstrating excellent antifouling properties10. Zwitterionic polymers, such as poly(sulfobetaine methacrylate) (PSBMA) and poly(carboxybetaine methacrylate) (PCBMA), have been used to modify the membrane surface by coating11,12,13,14,15,16,17,18 to increase surface hydrophilicity and thus antifouling properties.
We demonstrate here a facile method to prepare zwitterionic hydrogels using sulfobetaine methacrylate (SBMA) via photopolymerization, which is crosslinked using poly(ethylene glycol) diacrylate (PEGDA, Mn = 700 g/mol) to improve the mechanical strength. We also present a procedure to construct robust membranes by impregnating the monomer and crosslinker in a highly porous hydrophobic support before the photopolymerization. The physical and water transport properties of the freestanding films and impregnated membranes are thoroughly characterized to elucidate the structure/property relationship for water purification. The prepared hydrogels can be used as a surface coating to enhance membrane separation properties. By adjusting the crosslinking density or by impregnating into hydrophobic porous supports, these materials can also form thin films with sufficient mechanical strength for osmotic processes, such as forward osmosis or pressure-retarded osmosis4.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Poly(ethylene glycol) diacrylate&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Mn = 700 (PEGDA)</td>
			<td>Sigma Aldrich</td>
			<td>455008</td>
			<td></td>
		</tr>
		<tr>
			<td>1-Hydroxycyclohexyl phenyl ketone, 99% (HCPK)</td>
			<td>Sigma Aldrich</td>
			<td>405612</td>
			<td></td>
		</tr>
		<tr>
			<td>[2-(Methacrloyloxy)ethyl dimethyl-(3-sulfopropyl) ammonium hydroxide, 97%</td>
			<td>Sigma Aldrich</td>
			<td>537284</td>
			<td>Acutely Toxic</td>
		</tr>
		<tr>
			<td>Ethanol, 95%</td>
			<td>Koptec, VWR International</td>
			<td>V1101</td>
			<td>Flamable</td>
		</tr>
		<tr>
			<td>Decane, anhydrous, 99%</td>
			<td>Sigma Aldrich</td>
			<td>457116</td>
			<td></td>
		</tr>
		<tr>
			<td>Solupor Membrane</td>
			<td>Lydall</td>
			<td>7PO7D</td>
			<td></td>
		</tr>
		<tr>
			<td>Micrometer&#160;</td>
			<td>Starrett</td>
			<td>2900-6</td>
			<td></td>
		</tr>
		<tr>
			<td>ATR-FTIR</td>
			<td>Vertex 70</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>DSC: TA Q2000</td>
			<td>TA Instruments</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Rame&#8217;-hart Goniometer: Model 190</td>
			<td>Rame&#8217;-hart Instruments</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Ultraviolet Crosslinker: CX-2000</td>
			<td>Ultra-Violet Products</td>
			<td></td>
			<td>UV radiation&#160;</td>
		</tr>
		<tr>
			<td>Permeation Cell: Model UHP-43</td>
			<td>Advantec MFS</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Deionized Water: Milli-Q Water</td>
			<td>EMD Millipore</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

synthesis of hydrogels with antifouling properties as membranes for water purification

Hydrogels have been widely utilized to enhance the surface hydrophilicity of membranes for water purification, increasing the antifouling properties and thus achieving stable water permeability through membranes over time. Here, we report a facile method to prepare hydrogels based on zwitterions for membrane applications. Freestanding films can be prepared from sulfobetaine methacrylate (SBMA) with a crosslinker of poly(ethylene glycol) diacrylate (PEGDA) via photopolymerization. The hydrogels can also be prepared by impregnation into hydrophobic porous supports to enhance the mechanical strength. These films can be characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) to determine the degree of conversion of the (meth)acrylate groups, using goniometers for hydrophilicity and differential scanning calorimetry (DSC) for polymer chain dynamics. We also report protocols to determine the water permeability in dead-end filtration systems and the effect of foulants (bovine serum albumin, BSA) on membrane performance.

Freestanding films prepared with the prepolymer solutions specified in steps 1.1 and 1.2 are referred to as S50 and S30, respectively. Detailed information is shown in Table 1. The prepolymer solution specified in step 1.2 was also used to fabricate impregnated membranes, which are denoted as IMS30. Because the porous support is made of hydrophobic polyethylene, only the prepolymer solution containing ethanol can be impre...

Watch this Scientific Journal Video about Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification at JoVE.com

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

This paper reports practical methods to prepare hydrogels in freestanding films and impregnated membranes and to characterize their physical properties, including water transport properties.

Hydrogels have been widely utilized to enhance the surface hydrophilicity of membranes for water purification, increasing the antifouling properties and ...

The overall goal of this procedure is to prepare and characterize freestanding films and impregnated membranes based on zwitterionic hydrogels for membrane water purification. This method provide guidance for repairing hydrogel base freestanding film in impregnated membrane and as well as for characterizing their physical and transport properties. The main advantage of this technique is that it's simple, fast, and easy to be scaled up in industrial production.Visual demonstration of this method is critical as the integrated hydrogel preparation and characterization steps are difficult to learn because custom built apparatus is used, and interdisciplinary skills are required. To prepare the freestanding films, first place two spacers of known thickness on a clean quartz disc. The thickness of the spacers controls the thickness of the obtained polymer films.Transfer a small amount of the pre-polymer solution to the quartz disc using a disposable pipette. Place another quartz disc on top of the liquid and ensure that there are no bubbles in the liquid film. Then, place the sample in an ultraviolet or UV crosslinker and irradiate it for five minutes using UV light with a wavelength of 254 nanometers.When the polymer film is removed from the quartz disc, it is critical to work slowly to avoid tearing the film. Separate the polymer film from the quartz discs using a sharp blade. Use tweezers to transfer the film to a deionized water bath.Change the water twice during the first 24 hours to remove the solvent, unreacted monymer and crosslinker, and solve from the film. To prepare dried films for analysis, remove the film from the water bath and allow it to air dry for 24 hours. Place the film in a vacuum oven at 80 degrees Celsius to dry overnight under vacuum.Place a sheet of porous support onto a quartz disc. Using a foam brush, coat each side of the support twice with a prepolymer solution that is based on the water ethanol mixture. Place another quartz disc on top of the support.Then place the sample in a UV crosslinker and irradiate it for five minutes using UV light with a wavelength of 254 nanometers. To remove the impregnated membrane from the quartz discs, immerse the whole assembly in a deionized water bath for five minutes and carefully remove the membrane using a sharp blade and tweezers. Keeping the membrane in deionized water, change the water twice to remove the solvent, the unreacted monymer and crosslinker, and the sol from the membrane.To prepare dried, impregnated membranes for analysis, remove the membrane from the water bath, allow the membrane to dry at ambient conditions for 24 hours. Then, dry the membrane in a vacuum oven overnight at 80 degrees Celsius under vacuum. To measure the contact angles using the pendant drop method, first cut a rectangular strip of the membrane sample.Soak this strip in deionized water for 10 minutes. And then dry it for five minutes. Place the dried sample on the sample holder.Then, submerge the sample holder in a transparent environmental chamber containing the deionized water. In the next step, it is critical to work slowly and dispensing the n-decane drops onto the membranes. Using a microliter syringe with a stainless steel needle, dispense drops of n-decane onto the membrane sample.Leave the setup undisturbed for two minutes to ensure the stabilization of the droplets. Next, use appropriate image analysis software to determine the contact angle of the samples by measuring the angles of the dispensed droplets on the membrane surface. To characterize the water permeability using a dead end filtration system, first cut coupons of freestanding films and impregnated membranes with a hammer driven hole punch of an appropriate diameter.Place a prepared coupon on the porous support inside a dead end filtration cell. Then, place the O ring on top of the sample. Screw the two halves of the permeation cell together.Next, add approximately 50 milliliters of deonized water to the permeation cell. Screw on the cap and place the permeation cell on a magnetic stirrer. Set the stirring rate to between 300 and 900 RPM.Then, place a covered beaker on a balance to collect the permeate water and tear the balance. Open the valve on the gas cylinder. Turn the pressure regulator valve clockwise until the desired pressure is reached.Finally, open the release valve to deliver the pressure to the permeation cell. Monitor and record the weight of the beaker with time. Shown here are photos of the freestanding film, porous support, and impregnated membranes.It is evidence that after the porous support is filled with the hydrogel, it changes from opaque to transparent. The infrared spectra indicate the almost complete conversion of the acryllate groups in the hydrogels. Due to the absence of acryllate characteristic peaks in the spectra.The glass transition temperature of hydrogels is determined by differential scan calorimetry as shown here. Lower contact angles in the freestanding films and impregnated membranes indicate the greater hydrophilicity than the porous support. After watching this video you should have a good understanding of how to repair hydrogel base materials and characterize their properties.This work describes a faster method to fabricate hydrogel based material via photopolymerizations as well as how to characterize them for water purification. The method and material may also be used to repair membrane for gas operations such as CO2 capture. Don't forget that working with chemical and UV radiation can be extremely hazardous and precautions such as personal protective equipment should always be taken while performing this procedure.

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