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The efficiency of the fabricated MFI zeolite membrane on chromium removal is assessed with other membranes reported in the literature (Neelakandan et al. 2003; Pugazhenthi et al. 2005; Shukla & Kumar 2007; Sachdeva & Kumar 2008; Ren et al. 2010; Vinodhini & Sudha 2016). From the assessment survey (Table 1), the highest removal of 78% with a permeate flux of 1.42 × 10–4 m3/m2s achieved in this work is better than that of other membranes. Even though some of the membranes showed a higher percentage removal of chromium in comparison with this work, the flux (1.42 × 10–4 m3/m2s) of the present study is 1–6 orders higher when compared with other membranes (see Table 1), and also the membrane displays a reasonable removal percentage (78%). Thus, the prepared MFI zeolite membrane proved to be better in comparison with other membranes for chromium removal.

Table 1

Potential assessment of the prepared membrane with other membranes on chromium(VI) removal

Membrane materialPore sizeFeed concentration (ppm)Solute permeability (m3/m2s)Rejection (%)References
PMMA-EGDM 8.5 kDa 1,000 5.96 × 10–10 68 Neelakandan et al. (2003)  
Zeolite-clay membrane 30 nm 1,000 2.73 × 10–6 66 Shukla & Kumar (2007)  
Clay-carbon 2 nm 1,000 1.46 × 10–8 96 Pugazhenthi et al. (2005)  
Styrene acrylonitrile 55 nm 1,000 2.38 × 10–6 90 Sachdeva & Kumar (2008)  
CA-NCS-PEG – 1,055 7.03 × 10–7 95 Vinodhini & Sudha (2016)  
PMIA membrane 32 nm 130 2.07 × 10–5 90 Ren et al. (2010)  
MFI-type zeolite membrane 0.272 μm 1,000 1.42 × 10–4 78 This study 
Membrane materialPore sizeFeed concentration (ppm)Solute permeability (m3/m2s)Rejection (%)References
PMMA-EGDM 8.5 kDa 1,000 5.96 × 10–10 68 Neelakandan et al. (2003)  
Zeolite-clay membrane 30 nm 1,000 2.73 × 10–6 66 Shukla & Kumar (2007)  
Clay-carbon 2 nm 1,000 1.46 × 10–8 96 Pugazhenthi et al. (2005)  
Styrene acrylonitrile 55 nm 1,000 2.38 × 10–6 90 Sachdeva & Kumar (2008)  
CA-NCS-PEG – 1,055 7.03 × 10–7 95 Vinodhini & Sudha (2016)  
PMIA membrane 32 nm 130 2.07 × 10–5 90 Ren et al. (2010)  
MFI-type zeolite membrane 0.272 μm 1,000 1.42 × 10–4 78 This study 

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