Scavenging of nitrate ions from water using hybrid Al2O3/bio-TiO2nanocomposite impregnated thermoplastic polyurethane nanofibrous membrane

Suriyaraj, S. P.; Pillai, Mamatha M.; Bhattacharyya, Amitava; Selvakumar, R.

doi:10.1039/c5ra09469k

Cited by 15 publications

(7 citation statements)

References 42 publications

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“…The dramatic improvement in the adsorption was attributed to the electrostatic interaction between the anions and positively charged sites on the surface of the acid-treated carbon cloth, as the distilled water-treated carbon cloth adsorbed 5 and 20 times less of NO3and NO2 -, respectively, compared to the former (Afkhami et al, 2007). In a very recently reported work, a similar scenario was also observed where NO3adsorption was enhanced due to involvement of the surface OHgroups by bridging between NO3and metal oxide surfaces (Suriyaraj et al, 2015). Therefore, as revealed from the literature, the high uptake of oxalic acid than nitrate by carbon based TiO2,…”

Section: Adsorption Isotherms Of Nitrate and Oxalic Acidsupporting

confidence: 58%

Use of carbon-based composites to enhance performance of TiO2 for the simultaneous removal of nitrates and organics from aqueous environments

Adamu

Shand

Taylor

et al. 2018

Environ Sci Pollut Res

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The simultaneous photocatalytic removal of nitrate from aqueous environment in presence of organic hole scavenger using TiO has long been explored. However, the use of unmodified TiO in such reaction resulted in non-performance or release of significant amount of undesirable reaction products in the process, a problem that triggered surface modification of TiO for enhanced photocatalytic performance. Previous studies focused on decreasing rate of charge carrier recombination and absorption of light in the visible region. Yet, increasing active sites and adsorption capacity by combining TiO with a high surface area adsorbent such as activated carbon (AC) remains unexploited. This study reports the potential of such modification in simultaneous removal of nitrates and oxalic acid in aqueous environment. The adsorptive behaviour of nitrate and oxalic acid on TiO and TiO/AC composites were studied. The Langmuir adsorption coefficient for nitrate was four times greater than that of oxalic acid. However, the amount of oxalic acid adsorbed was about 10 times greater than the amount of nitrate taken up. Despite this advantage, the materials did not appear to produce more active photocatalysts for the simultaneous degradation of nitrate and oxalic acid. The photocatalytic activity of TiO and its carbon-based composites was improved by combination with CuO particles. Consequently, 2.5 CuO/TiO exhibited the maximum photocatalytic performance with 57.6 and 99.8% removal of nitrate and oxalic acid, respectively, while selectivity stood at 45.7, 12.4 and 41.9% for NH, NO and N, respectively. For the carbon based, 2.5 CuO/TiO-20AC showed removal of 12.7% nitrate and 80.3% oxalic acid and achieved 21.6, 0 and 78.4% selectivity for NH, NO and N, respectively. Using the optimal AC loading (20 wt%) resulted in significant decrease in the selectivity for NH with no formation of NO, which unveils that selectivity for N and low/no selectivity for undesirable products can be manipulated by controlling the rate of consumption of oxalic acid. In contract, no nitrate reduction was observed with CuO promoted TiO-T and its TiO-(T)-20AC, which may be connected to amorphous nature of TiO-T and perhaps served as charge carrier trapping sites that impeded activity.

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Section: Adsorption Isotherms Of Nitrate and Oxalic Acidsupporting

confidence: 58%

Use of carbon-based composites to enhance performance of TiO2 for the simultaneous removal of nitrates and organics from aqueous environments

Adamu

Shand

Taylor

et al. 2018

Environ Sci Pollut Res

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“…Recently, a hybrid Al 2 O 3 /bio-TiO 2 nanocomposite was prepared by our group and further impregnated into a thermoplastic polyurethane (TPU) nanobrous membrane and studied for its efficiency for uoride removal from an aqueous solution using a dip mode adsorption method. 68 The adsorption capacities (Q 0 ) of the nanocomposite and the nanocomposite impregnated TPU nanober were found to be 2.73 and 1.9 mg g À1 respectively. This facile approach of designing nanocomposite impregnated nanober membranes can be used for F À removal from drinking water.…”

Section: Polymer Carbon and Hydroxyapatite Based Nanomaterialsmentioning

confidence: 96%

Advances in nanomaterial based approaches for enhanced fluoride and nitrate removal from contaminated water

Suriyaraj

Selvakumar

2016

RSC Adv.

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“…This showed efficient filtration of organic dyes and carcinogenic ions such as arsenic and even TiO2 nanoparticles from the water. A nontoxic alumina/titanium oxide composite with PU electrospun fibers formed via electrospraying silanes have also been shown to be able to remove fluoride ions from water with high adsorption capacity [53]. Additionally, studies were conducted with this kind of composite, and it was observed that it is also effective in removing nitrates from aqueous media.…”

Section: Poly (Vinylidene Fluoride)mentioning

confidence: 99%

Electrospun polymeric nanofibrous membranes for water treatment

Snowdon¹,

Liang²

2018

Preprint

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A necessity for water filtration technology, due to global pollution and population growth, has led to an increase in attention to advanced nanomaterials that can aid in the purification of air and water. This size-dependent filtration is possible via nanofibrous membranes as they contain high porosity and this pore size is tunable through the fabrication process. Because of this tunability in the nanofibril membrane composition and structure, they possess promising straining abilities, such as high permeability and selectivity, as well as low fouling. There are a variety of polymer blends or organic/inorganic nanofillers that can be used depending on filtration needs. The production of nanofibers consists of various avenues such as synthetic templates, separation by different phases, nanoparticle self-assembly, and most widespread, electrospinning. Electrospinning is prevalent owing to its ease of use and low cost compared to template and self- assembly processes. This chapter describes the multifaceted progression governing electrospinning and its working factors as well as the environmental settings that form nanofibers and their resultant membranes. Additionally, the various designs of electrospinning apparatuses' and review of the methods used to prepare multifunctional composite electrospun nanofibrous membranes will be discussed. Past achievements and current challenges will be provided. Conclusions and perspectives are specified fitting to studied progress so far as well as future needs with regards to water treatment, with a particular focus on industrial applications.

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Scavenging of nitrate ions from water using hybrid Al₂O₃/bio-TiO₂nanocomposite impregnated thermoplastic polyurethane nanofibrous membrane

Cited by 15 publications

References 42 publications

Use of carbon-based composites to enhance performance of TiO2 for the simultaneous removal of nitrates and organics from aqueous environments

Use of carbon-based composites to enhance performance of TiO2 for the simultaneous removal of nitrates and organics from aqueous environments

Advances in nanomaterial based approaches for enhanced fluoride and nitrate removal from contaminated water

Electrospun polymeric nanofibrous membranes for water treatment

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