Silica Membranes for Wetland Saline Water Desalination: Performance and Long Term Stability

Elma, Muthia; Riskawati, Nur; Marhamah,

doi:10.1088/1755-1315/175/1/012006

Cited by 31 publications

(19 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the second step, the sol pH is adjusted by the addition of the ammonia hydroxide; the pH increases rapidly to >4, which is much higher than the isoelectric point boundary (pH 1–3) of the silica species. Instantly, the silanol species are expected to all be deprotonated while participating in the polycondensation reaction, generating a large concentration of highly siloxane species [ 9 ]. However, the result is contrary to Elma, Riskawati and Marhamah’s [ 9 ] work, which produced the highest silanol on two-step catalyst, as shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Instantly, the silanol species are expected to all be deprotonated while participating in the polycondensation reaction, generating a large concentration of highly siloxane species [ 9 ]. However, the result is contrary to Elma, Riskawati and Marhamah’s [ 9 ] work, which produced the highest silanol on two-step catalyst, as shown in Table 2 . This suggests the difference of acid catalyst usage, e.g., organo catalyst (citric acid) instead of nitric acid in this work.…”

Section: Resultsmentioning

confidence: 99%

“…Pure silica membrane-derived TEOS synthesis by two-step (nitric acid-ammonia) catalyst has been studied by Elma et al [ 9 ]. Although this material produces a mesoporous structure that is good for desalination, the membrane performance still decreases.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

et al. 2021

Self Cite

View full text Add to dashboard Cite

The physicochemical properties of organo-silica xerogels derived from organo catalyst were pervasively investigated, including the effect of one-step catalyst (citric acid) and two-step catalyst (acid-base), and also to observe the effect of sol pH of organo-silica xerogel toward the structure and deconvolution characteristic. The organo-silica xerogels were characterized by FTIR, TGA and nitrogen sorption to obtain the physicochemical properties. The silica sol–gel method was applied to processed materials by employing TEOS (tetraethyl orthosilicate) as the main precursor. The final molar ratio of organo-silica was 1:38:x:y:5 (TEOS:ethanol: citric acid: NH3:H2O) where x is citric acid concentration (0.1–10 × 10−2 M) and y is ammonia concentration (0 to 3 × 10−3 M). FTIR spectra shows that the one-step catalyst xerogel using citric acid was handing over the higher Si-O-Si concentration as well as Si-C bonding than the dual catalyst xerogels with the presence of a base catalyst. The results exhibited that the highest relative area ratio of silanol/siloxane were 0.2972 and 0.1262 for organo catalyst loading at pH 6 and 6.5 of organo-silica sols, respectively. On the other hand, the organo-silica matrices in this work showed high surface area 546 m2 g−1 pH 6.5 (0.07 × 10−2 N citric acid) with pore size ~2.9 nm. It is concluded that the xerogels have mesoporous structures, which are effective for further application to separate NaCl in water desalination.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Mesoporous silica gains attention because of a thermally stable and strong structure [ 13 , 14 ]. Silica has unique physiochemical properties composed of a cross-linked network structure [ 15 , 16 ] and vigorous [ 17 ] and high surface area [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Hybrid and Templated Silica-P123 Membranes for Brackish Water Desalination

et al. 2020

Self Cite

View full text Add to dashboard Cite

Water scarcity is still a pressing issue in many regions. The application of membrane technology through water desalination to convert brackish to potable water is a promising technology to solve this issue. This study compared the performance of templated TEOS-P123 and ES40-P123 hybrid membranes for brackish water desalination. The membranes were prepared by the sol–gel method by employing tetraethyl orthosilicate (TEOS) for the carbon-templated silica (soft template) and ethyl silicate (ES40) for the hybrid organo-silica. Both sols were templated by adding 35 wt.% of pluronic triblock copolymer (P123) as the carbon source. The silica-templated sols were dip-coated onto alumina support (four layers) and were calcined by using the RTP (rapid thermal processing) method. The prepared membranes were tested using pervaporation set up at room temperature (~25 °C) using brackish water (0.3 and 1 wt.%) as the feed. It was found that the hybrid membrane exhibited the highest specific surface area (6.72 m2·g−1), pore size (3.67 nm), and pore volume (0.45 cm3·g−1). The hybrid ES40-P123 was twice thicker (2 μm) than TEOS-P123-templated membranes (1 μm). Lastly, the hybrid ES40-P123 displayed highest water flux of 6.2 kg·m−2·h−1. Both membranes showed excellent robustness and salt rejections of >99%.

show abstract

“…Among all types of membranes, silica has excellent mechanical strength and thermal stability. The unique characteristic of silica materials are physiochemical properties which consist of cross-linked network structure (Diniz Da Costa, 2000, Ellis, 2004, high surface area , and vigorous (Elma, Riskawati, Marhamah, 2018). Owing to these properties, silica has been gaining widespread attention in material research.…”

Section: Introductionmentioning

confidence: 99%

Wetland Saline Water and Acid Mine Drainage Desalination by InterlayeFree Silica Pectin Membrane from Banan Peels

Elma

Akhbar

Mustalifah

et al. 2020

Nusantara Science and Technology Proceedings

View full text Add to dashboard Cite

Wetland water and acid mine drainage are available in South Kalimantan, Indonesia. However, "Wetland saline water (WSW)" phenomena occur in the wetland areas due to the seawater intrusion, this water which contains a high salt concentration is unsafe to be consumed. While acid mine drainage (AMD) pollution becomes an issue in the mining industry that impact human life and the environment. Salt particles could be removed by using a silica pectin membrane. Banana peel has a high pectin substance. Banana pectin (0.5wt% and 0.1wt%) was employed in silica and calcined at 300 and 400 °C. We demonstrate the silica pectin template's performance without interlayer for wetland water and acid mine drainage desalination. Membranes were developed through a sol-gel method with silica source deposited from tetraethyl orthosilicate (TEOS) and performed by pervaporation at room temperature (~25 °C). As a result, 0.5wt% banana pectin concentration at 300 °C exhibited excellent performance with the highest water fluxes are 8.4 and 10.4 kg m −2 h −1 for WSW and AMD, respectively. Nevertheless, both membranes achieved high salt rejections up to 92%. Thereby, banana pectin as a carbon source impacts the stronger silica bond.

show abstract

Silica Membranes for Wetland Saline Water Desalination: Performance and Long Term Stability

Cited by 31 publications

References 12 publications

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

Physicochemical Properties of Mesoporous Organo-Silica Xerogels Fabricated through Organo Catalyst

Development of Hybrid and Templated Silica-P123 Membranes for Brackish Water Desalination

Wetland Saline Water and Acid Mine Drainage Desalination by InterlayeFree Silica Pectin Membrane from Banan Peels

Contact Info

Product

Resources

About