Reductive catalysis of novel TiO2/Fe0 composite under UV irradiation for nitrate removal from aqueous solution

Pan, Jill-Ruhsing; Huang, Chihpin; Hsieh, Wen‐Pin; Wu, Bi

doi:10.1016/j.seppur.2011.06.024

Cited by 51 publications

(20 citation statements)

References 17 publications

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“…The removal of nitrate increases with contact time. These results are in accordance with previous studies such as Hwang et al (2011), Yang andLee (2005), Zazouli et al (2014b) and Pan et al, (2012). Such a phenomenon could be explained by the time required for activation of the Fe 0 surface and the amount of ferrous ions released from the Fe 0 surface such that the ferrous accumulation increased with time and, as a result, nitrate removal rate increased (Liao et al, 2003, Anotai et al, 2010.…”

Section: Effect Of Contact Time and Nitrate Concentrationsupporting

confidence: 92%

“…Yang and Lee (2005) and Huang et al (1998) also reported that at a high initial nitrate concentration, the removal increases. Adding Fe-doped TiO2 to water containing nitrate and nitrite induces the production of Fe 2 + and ammonia (NH 4 + ) or N2 gas (reactions 1 and 2) Pan et al, (2012) have reported that TiO2 possesses both oxidative and reductive abilities when removing nitrate from aqueous systems. Without the presence of other materials to capture the electron, TiO2 is ineffective in terms of nitrate removal and assumes only a supplemental role in promoting the reaction (Pan et al, 2012;Sá et al, 2005).…”

Section: Effect Of Contact Time and Nitrate Concentrationmentioning

confidence: 99%

“…Adding Fe-doped TiO2 to water containing nitrate and nitrite induces the production of Fe 2 + and ammonia (NH 4 + ) or N2 gas (reactions 1 and 2) Pan et al, (2012) have reported that TiO2 possesses both oxidative and reductive abilities when removing nitrate from aqueous systems. Without the presence of other materials to capture the electron, TiO2 is ineffective in terms of nitrate removal and assumes only a supplemental role in promoting the reaction (Pan et al, 2012;Sá et al, 2005). UV radiation causes Fe 0 surface activation and direct photolysis of nitrate itself; these are two advantages of the UV-irradiated system (Liao et al, 2003).…”

Section: Effect Of Contact Time and Nitrate Concentrationmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of nitrate removal from aqueous solution by Fe-doped TiO2 under UV and solar irradiation using response surface methodology

2015

Global NEST Journal

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Nitrate is a common groundwater pollutant all over the world. In some regions of Iran, its levels are high enough to cause serious problems to human health and the environment. The objectives of this work were to evaluate the efficiency of Fe-doped TiO2 nanoparticles at removing nitrate from aqueous solutions under UV and solar radiation and to model nitrate removal using response surface methodology techniques. In this study, a response surface methodology based on the Box-Behnken design matrix was used to describe the process of nitrate removal from an aqueous solution with four independent parameters, namely Fe-doped TiO2 (dose 1-2 g l -1), nitrate concentration (25-100 mg l -1 ), contact time (10-120 min), and pH (4-9). The results indicated that the removal efficiency of nitrate in the presence of ultraviolet and solar radiation was 56.5 % and 21.8%, respectively. The removal efficiency of nitrate increased with time and initial concentration of nitrate. Analysis of variance (ANOVA) indicated that the proposed model was essentially in accordance with the experimental results with the correlation coefficient R 2 = 0.9237 and Adj-R 2 = 0.8347. Response surface methodology (RSM) proved to be a powerful statistical tool for investigating the operating conditions for nitrate removal under UV irradiation.

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Section: Effect Of Contact Time and Nitrate Concentrationsupporting

confidence: 92%

Section: Effect Of Contact Time and Nitrate Concentrationmentioning

confidence: 99%

Section: Effect Of Contact Time and Nitrate Concentrationmentioning

confidence: 99%

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Modeling of nitrate removal from aqueous solution by Fe-doped TiO2 under UV and solar irradiation using response surface methodology

2015

Global NEST Journal

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“…In these processes, iron nanoparticles have shown high efficiency and practically no damage for the environment because of absence of toxicity. Thus, the efficiencies of nitrate removal from aqueous solution by single (TiO 2 and nZVI), and composite (nano-TiO 2 -Fe 0 composite, NTFC) system under UV illumination were studied [51]. Among the three systems, both nZVI and NTFC can effectively remove nitrate.…”

Section: Catalyzed Removal or Decomposition Of Pollutantsmentioning

confidence: 99%

Iron-based Nanomaterials in the Catalysis

Kharisov¹,

Kharissova²,

Dias³

et al. 2016

Advanced Catalytic Materials - Photocatalysis and Other Current Trends

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Abstract"vailable data on catalytic applications of the iron-containing nanomaterials are reviewed. Main synthesis methods of nZVI, nano-sized iron oxides and hydroxides, core-shell and alloy structures, ferrites, iron-containing supported forms, and composites are described. Supported structures include those coated and on the basis of polymers or inert inorganic materials i.e., carbon, titania or silica . Description of catalytic processes includes the decomposition reactions in particular photocatalytic processes , reactions of dehydrogenation, oxidation, alkylation, C C coupling, among a series of other processes. Certain attention is paid to magnetic recovery of catalysts from reaction systems and their reuse up to several runs almost without loss of catalytic activity.

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“…Besides, a common limitation of Fe(0) application is progressive deactivation of Fe(0) that results from various geochemical reactions occurring in alkaline condition (Farrell et al 2000). To address this issue, several studies have investigated the utilities of several additive materials in alleviating pH rise or enhancing Fe(0) reactivity (Cho et al 2010;Oh et al 2007;Pan et al 2012;Song et al 2013). For example, magnetite nanoparticles added to a Fe(0) system have been shown to greatly improve the rate of nitrate and chromate, as well as lifetime of Fe(0) (Cho et al 2015;Lv et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

Cho

Kim

Schwartz

et al. 2015

Water Air Soil Pollut

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Calcium alginate beads entrapping a mixture of Fe(0) and nanosized magnetite (NMT) were prepared and evaluated for their capability to reduce nitrate in groundwater. Microscopic and spectroscopic analyses of the beads revealed that clusters of Fe(0)/NMT were entirely embedded in alginate polymer matrix containing a large number of carboxylic and hydroxyl functional groups. The extent of nitrate reduction increased with increasing content of Fe(0) and NMT in the beads, but there was a critical NMT mass limit relative to Fe(0) mass where no further increase in nitrate reduction occurred. The beads showed slower nitrate reduction kinetics than bare Fe(0)/NMT but had comparable capacity in overall nitrate removal. Nitrate reduction increased proportionally with an increase in bead dosage to give a maximum removal of 94.5 % at 37.5 g L −1 in 48 h. Nitrate reduction with 50 g L −1 beads achieved completion of two reduction cycles in 72 h to reduce 2.19 mM nitrate to less than 0.71 mM (10 mg-N L −1 ) in each cycle. The overall results demonstrated that the beads developed in this study have a potential utility in remediation of nitrate in groundwater.

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Reductive catalysis of novel TiO2/Fe0 composite under UV irradiation for nitrate removal from aqueous solution

Cited by 51 publications

References 17 publications

Modeling of nitrate removal from aqueous solution by Fe-doped TiO2 under UV and solar irradiation using response surface methodology

Modeling of nitrate removal from aqueous solution by Fe-doped TiO2 under UV and solar irradiation using response surface methodology

Iron-based Nanomaterials in the Catalysis

Reduction of Nitrate in Groundwater by Fe(0)/Magnetite Nanoparticles Entrapped in Ca-Alginate Beads

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