Preparation, characterization and chlorine stability of aromatic–cycloaliphatic polyamide thin film composite membranes

Buch, P.R.; Dodda, Jagan Mohan; Reddy, A.V.R.

doi:10.1016/j.memsci.2007.10.004

Cited by 151 publications

(52 citation statements)

References 21 publications

(28 reference statements)

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“…Previous studies have revealed that the changes in chemical nature of PA upon exposure to chlorine can affect membrane performance, shortening lifespan of membrane [23][24][25]. In order to overcome this limitation, Buch et al [26] made an attempt to develop chlorine stability of NF by interfacial polymerization of 1,3-cyclohexanebis (methylamine) (CHMA) in water with TMC in hexane under different conditions. The composite membranes with aromatic-cycloaliphatic PA top layer were then exposed to NaOCl-NaCl mixed solution of various NaOCl concentrations to ascertain the impact of chlorine on membrane properties.…”

Section: Recent Progress In Thin Film Composite Membrane Developmentmentioning

confidence: 99%

A recent progress in thin film composite membrane: A review

et al. 2012

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Section: Recent Progress In Thin Film Composite Membrane Developmentmentioning

confidence: 99%

A recent progress in thin film composite membrane: A review

et al. 2012

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“…Changes in contact angle due to exposure to hypochlorite are presented in Figure 3. Buch et al (Buch et al, 2008) reported that membrane chlorination increases the hydrophobic behaviour of polyamide membranes because of N-chlorination and thus, the ability for water to form hydrogen bonds with the membrane polymer was reduced due to the absence of a hydrogen-bonding proton. Consequently, N-chlorination would decrease the ability of the water to penetrate into the membrane, resulting in an increase in the hydrophobic properties (Buch et al, 2008).…”

Section: Contact Angle Measurementmentioning

confidence: 99%

“…Buch et al (Buch et al, 2008) reported that membrane chlorination increases the hydrophobic behaviour of polyamide membranes because of N-chlorination and thus, the ability for water to form hydrogen bonds with the membrane polymer was reduced due to the absence of a hydrogen-bonding proton. Consequently, N-chlorination would decrease the ability of the water to penetrate into the membrane, resulting in an increase in the hydrophobic properties (Buch et al, 2008). However, in contrast to the results reported by Buch et al (Buch et al, 2008), have also reported a decrease in the membrane contact angle due to chlorine exposure.…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Effects of hypochlorite exposure on morphology and trace organic contaminant rejection by NF/RO membranes

Simon

Nghiem

2014

Membr. Water Treat.

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The impacts of membrane degradation due to chlorine attack on the rejection of inorganic salts and trace organic contaminants by nanofiltration (NF) and reverse osmosis (RO) membranes were investigated in this study. The rejection of trace contaminants was examined at environmentally relevant concentrations. Changes in the membrane surface morphology were observed as a result of chlorine exposure. A small increase in rejection was consistently observed with all four membranes selected in this study after being exposed to a low concentration of hypochlorite (100 ppm). In contrast, a higher concentration of hypochlorite (i.e., 2000 ppm) could be detrimental to the membrane separation capacity. Membranes with severe chlorine impact showed a considerable decrease in rejection over filtration time, possibly due to rearrangement of the polyamide chains under the influence of chlorine degradation and filtration pressure. The reported results indicate that loose NF membranes are more sensitive to chlorine exposure than RO membranes. The impact of hypochlorite exposure (both positive and negative) on rejection is dependent on the strength of the hypochlorite solution and is more significant for the neutral carbamazepine compound than the negatively charged sulfamethoxazole. AbstractThe impacts of membrane degradation due to chlorine attack on the rejection of inorganic salts and trace organic contaminants by nanofiltration (NF) and reverse osmosis (RO) membranes were investigated in this study. The rejection of trace contaminants was examined at environmentally relevant concentrations.Changes in the membrane surface morphology were observed as a result of chlorine exposure. A small increase in rejection was consistently observed with all four membranes selected in this study after being exposed to a low concentration of hypochlorite (100 ppm). In contrast, a higher concentration of hypochlorite (i.e.: 2000 ppm) could be detrimental to the membrane separation capacity. Membranes with severe chlorine impact showed a considerable decrease in rejection over filtration time, possibly due to rearrangement of the polyamide chains under the influence of chlorine degradation and filtration pressure.The reported results indicate that loose NF membranes are more sensitive to chlorine exposure than RO membranes. The impact of hypochlorite exposure (both positive and negative) on rejection is dependent on the strength of the hypochlorite solution and is more significant for the neutral carbamazepine compound than the negatively charged sulfamethoxazole.

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“…In general, calcium salts, particularly CaCl 2 , would improve the hydrophilicity and flux of the resulting blend membrane [41]. Also, the chloride resistance of the resulting membrane would be enhanced due to the control of cleavage of the polymer chain [45]. This would be highly beneficial for the membranes to handle feed solution containing free chlorine and also during chemical cleaning processes.…”

Section: Chemical Engineering Division School Of Mechanical and Builmentioning

confidence: 99%

Improved Performance of CaCl 2 Incorporated Polyethersulfone Ultrafiltration Membranes

Krishnamoorthy

Velu

2016

Period. Polytech. Chem. Eng.

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Preparation, characterization and chlorine stability of aromatic–cycloaliphatic polyamide thin film composite membranes

Cited by 151 publications

References 21 publications

A recent progress in thin film composite membrane: A review

A recent progress in thin film composite membrane: A review

Effects of hypochlorite exposure on morphology and trace organic contaminant rejection by NF/RO membranes

Improved Performance of CaCl 2 Incorporated Polyethersulfone Ultrafiltration Membranes

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