Nitrate removal from water using iron nanoparticles produced by arc discharge vs. reduction

Kassaee, M.Z.; Motamedi, Elaheh; Mikhak, Azadeh; Rahnemaie, Rasoul

doi:10.1016/j.cej.2010.10.077

Cited by 99 publications

(35 citation statements)

References 44 publications

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“…Zero-valent iron is a type of iron which has a strong reducing element (Moradi et al 2016). Compared to Zero-Valent Iron (ZVI), NZVI is more suitable for use since it has a higher specifi c surface area and reactivity (Kassaee et al 2011, Mangal et al 2013. On the other hand, zero--valent iron nanoparticles are widely used to remove organic compounds (Kassaee et al 2011), chromium 6 valent (Ponder et al 2000), herbicides (Joo et al 2004), aromatics (Choe et al 2001), and arsenic (Kanel et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…It is a process in which molecules in a solution are drawn and accumulate to the internal surfaces of an adsorbent material. The process is simple, economic, fast and do not involve any fi ltration and chemical materials (Kassaee et al 2011). Many adsorbents are used for the removal of phenol and chlorophenols in wastewater (Bayramoglu et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Compared to Zero-Valent Iron (ZVI), NZVI is more suitable for use since it has a higher specifi c surface area and reactivity (Kassaee et al 2011, Mangal et al 2013. On the other hand, zero--valent iron nanoparticles are widely used to remove organic compounds (Kassaee et al 2011), chromium 6 valent (Ponder et al 2000), herbicides (Joo et al 2004), aromatics (Choe et al 2001), and arsenic (Kanel et al 2005). The use of a support, like activated carbon, does have suitable porosity for absorption of 4-CP from water and prevents the agglomeration of iron and therefore presents a higher specifi c surface area and surface charge of iron to the aqueous stream (Ponder et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Majlesi¹,

Hashempour²

2017

Archives of Environmental Protection

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NomenclatureRSM Response surface methodology BBD Box-Behnken factorial design AC Activated carbon NZVI Nano zero-valent iron SEM scanning electron microscope EDS electron dispersion spectrometer XRD x-ray diffraction PEG polyethylene glycol q e the amount of 4-CP adsorbed (mg l Keywords: response surface methodology, 4-chlorophenol, NZVI/AC.- Abstract:The phenolic compounds are known as priority pollutants, even in low concentrations, as a result of their toxicity and non-biodegradability. For this reason, strict standards have been established for them. In addition, chlorophenols are placed in the 38th to 43th in highest priority order of toxic pollutants. As a consequence, contaminated water or wastewaters with phenolic compounds have to be treated before discharging into the receiving water. In this study, Response Surface Methodology (RSM) has been used in order to optimize the effect of main operational variables responsible for the higher 4-chlorophenol removal by Activated Carbon-Supported Nanoscale Zero Valent Iron (AC/NZVI). A Box-Behnken factorial Design (BBD) with three levels was applied to optimize the initial concentration, time, pH, and adsorbent dose. The characterization of adsorbents was conducted by using SEM-EDS and XRD analyses. Furthermore, the adsorption isotherm and kinetics of 4-chlorophenol on AC and AC/NZVI under various conditions were studied. The model anticipated 100% removal effi ciency for AC/NZVI at the optimum concentration (5.48 mg 4-chlorophenol/L), pH (5.44), contact time (44.7 min) and dose (0.65g/L). Analysis of the response surface quadratic model signifi ed that the experiments are accurate and the model is highly signifi cant. Moreover, the synthetic adsorbent is highly effi cient in removing of 4-chlorophenol.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Majlesi¹,

Hashempour²

2017

Archives of Environmental Protection

View full text Add to dashboard Cite

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“…(1)) will increase solution pH (to <10) from the accumulation of hydroxyl ions [19,31], which could possibly enhance heavy metal removal through precipitation and the ferrite formation process (Eqs. (2) and (3)) [32,33].…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Adeleye

Zhou

et al. 2014

Journal of Hazardous Materials

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“…Chlorinated solvents, organochlorine pesticides, polychlorinated biphenyls, organic dyes, inorganic pollutants, heavy metals, antibiotics have been removed by NZVI. The mechanism of removal was oxidation and reduction in most cases (Kassaee 2011, Nowack 2007, Shan 2008and Ghauch 2009). The oxides and Hydroxide Iron Oxide (FeOOH) have also been used in photocatalytic processes to removal pollutant molecules, for example the 20 mg/L bisphenyl by 200 mg/L α-Fe 2 O 3 and 8 W, UV radiation at pH value of 7, 60 min of the 24% was removed after 60 min (Li 2007).…”

Section: Introductionmentioning

confidence: 99%

Focus on kineticcs of removal antibiotics wastewater by nano-zero valent iron in oxidation and photoxidation process

et al. 2017

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Pharmaceutical wastewater can be difficult to treat with conventional physical/chemical and biological treatment systems. The presence of antibiotics in sewage selects for resistance markers that are able to spread through the microbial community and as a result, antibiotic resistant bacteria can potentially disseminate their resistance genes widely among members of the endogenous microbial community. The sludge products of urban and rural wastewater treatment plants are increasingly used to fertilize agricultural crops, dispersing unknown amounts of resistance genes and antibiotics that withstand standard sewage treatment. Pharmaceutical wastewater effluents are well known for their difficult elimination by traditional biotreatment methods and their important contribution to environmental pollution due to its fluctuating and recalcitrant nature. OTC is one of the nonbiodegradable antibiotics that makes antibiotic-resistant, so it can make be high risk for environment. NZVI can be a good choice for removal of OTC in aqueous solution. Response surface methodology (RSM) was used to optimize the amounts of NZVI and OTC to be used at pH 3 and under 200 W, UV-A irradiation. The responses were removal percent of absorption at 290 and 348 nm, TOC and COD of OTC. In the optimum condition, Linear model was performed 155 ppm of OTC were removed by 1000 ppm NZVI after 6.5 hours and the removal efficiency of absorption at 290 and 348 nm, TOC and COD were 87, 95, 85 and 89 percent, respectively. In the similar process, there is no organic compound after 14 hours. The parameters ORP, DO and pH were investigated for 6:30 hours to study the type of NZVI reaction in process. In the beginning of reaction, oxidation was the dominant reaction after 3 hours, photo catalytic reaction was remarkable. The mechanism of OTC degradation is proposed by HPLC/ESI-MS and four by products were found. Also the rate constants (first order kinetic chain reaction model) were 0.0099, 0.0021, 0.0010, 0.0049 and 0.0074 min -1 , respectively.

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Nitrate removal from water using iron nanoparticles produced by arc discharge vs. reduction

Cited by 99 publications

References 44 publications

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Removal of 4-chlorophenol from aqueous solution by granular activated carbon/nanoscale zero valent iron based on Response Surface Modeling

Effects of nitrate on the treatment of lead contaminated groundwater by nanoscale zerovalent iron

Focus on kineticcs of removal antibiotics wastewater by nano-zero valent iron in oxidation and photoxidation process

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