Aromatic-cycloaliphatic polyamide thin-film composite membrane with improved chlorine resistance prepared from m-phenylenediamine-4-methyl and cyclohexane-1,3,5-tricarbonyl chloride

Yu, Shuili; Liu, Meihong; Lü, Zhenhua; Yong, Zhou; Gao, Congjie

doi:10.1016/j.memsci.2009.07.046

Cited by 111 publications

(41 citation statements)

References 19 publications

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“…It is elucidated that the conversion of amide N-H group to N-Cl group upon chlorine exposure is the main factor causing the hydrophobic character of PA layer to increase, leading to remarkable flux deterioration. Compared to the membrane CHMA-TMC, aromatic-cycloaliphatic PA membranes developed from m-phenylenediamine-4-methyl (MMPD) and cyclohexane-1,3,5-tricarbonyl chloride (HTC) showed attractive chlorine resistance of more than 3000 ppm-h Cl [27]. The very significant improvement on the stability of the membrane MMPD-HTC is attributed to the use of aromatic diamine compound with a mono CH 3 substituent at the ortho position which is believed can minimize the attack by chlorine present in the water (see Table 1).…”

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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“…The nodular structure is more pronounced when the film is formed over polysulfone blend supports [13]. The nodular structure also depends on the reaction time during interfacial polymerization [14]. For shorter reaction time, the degree of cross-linking is lower, and the "thin and loose" polyamide skin layer will allow the higher permeation of both water and salt.…”

Section: Membranes Characteristicsmentioning

confidence: 99%

Membrane Selection for Organic Contaminants Removal From Hartbeespoort Dam Water in South Africa

Adeniyi¹,

Mbaya²,

Popoola³

et al. 2017

WIT Transactions on Ecology and the Environment

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Membrane filtration of raw water obtained from Hartbeespoort dam in South Africa and spiked with four different organochlorides pesticides and three polyaromatic hydrocarbons was done using three different commercially available membranes (AFC 40, AFC80 and AFC99). The purpose was to determine important membrane characteristics for removal of organic contaminants and enhance water recovery. AFC40, a nanofiltration membrane, showed a modular structure, has 2.9% porosity and average roughness 0.76. AFC80, a reverse osmosis membrane, showed little modular structure, has 2.9% porosity and average roughness 0.79. AFC99, another reverse osmosis membrane was tight and showed no nodular structure, percentage porosity was 0.2 while average roughness was 0.67. All the membranes are hydrophilic and gave more than 99% rejection of organic solutes however water recovery was higher with AFC40 which is more hydrophilic (Contact angle 30°-40°) and lowest with AFC99 which is less hydrophilic (Contact angle 40°-63°). EDX results showed that AFC99 has the lowest sodium and sulphur contents. This may have contributed to the absence of modular structure, lower hydrophilicity, and its tightness. The FTIR analysis of the membranes indicated a significant presence of amides group (peak at 1650cm -1 ) and acyl and phenyl C-O groups in all the membranes (peak at 1150 cm -1 ). The presence of ortho disubstituted aromatic group (peak at 74 cm -1 ) was observed in both AFC40 and AFC80 but not in AFC99. This is suspected to have contributed to the tight structure of AFC99. AFC40 had little effect on the conductivity of the feed water. Membranes with higher nodular structure have a higher porosity. The presence of nodular structure increases water recovery but also allows the passage of some dissolved solids, and is therefore important in the selection of membranes for organic contaminants removal from hartbeespoort dam water.

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“…Other organic soluble monomers such as 5-isocyanato-isophthaloyl chloride, 5-chloroformyloxy-isophthaloyl chloride, nonaromatic cyclohexyl tricarboxylic acid chloride, and 2,4,6-pyridinetricarboxylic acid chloride were used for the preparation of TFC membranes to evaluate the effect of these monomers' structure on the performance of the formed TFC membranes [15][16][17]5]. As far as structure of diamine is considered, mixture of MPD + m-phenylenediamine-5-sulfonic acid or mixture of MPD + m-phenylenediamine 2,2′-benzidinedisulfonic acid was reacted with TMC for the preparation of TFC membranes [5,18,19].…”

Section: Introductionmentioning

confidence: 99%