Magnetic Zeolite as Arsenic Sorbent

Václavíková, Miroslava; Stefusova, K.; Ivaničová, Lucia; Jakabský, Štefan; Gallios, George P.

doi:10.1007/978-90-481-3497-7_5

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The effect of pH on the zeta potential of synthetic magnetite in the absence and presence of molybdenum is given in Figure 2. The pH at which the zeta potential is zero is called the point of zero charge (pH pzc ) and lies, in the absence of molybdenum, around pH 4.0, in fair agreement with an earlier paper that reported a pH pzc of 4.86 for the same adsorbent (Vaclavikova 2010). Below pH 4, the adsorbent is positively charged.…”

Section: Resultssupporting

confidence: 86%

“…New sorbent materials consisting of a matrix (zeolite, activated carbon, aluminum silicates, polymeric structures) hosting various types of adsorbents (e.g., hydrous ferric oxides, maghemite, polymers, HDTMA), have been developed and represent an innovative, attractive and economic approach for the removal of anions such as arsenate (Habuda-Stanic et al, 2008, Schmidt et al, 2008Vaclavikova et al, 2010), chromate (Misaelides et al, 2008, Barquist andLarsen, 2010), sulphate and phosphate (Oliveira andRubio, 2007, Vujakovic et al, 2000) and antimonate (Wingenfelder et al, 2006). Vaclavikova et al (2010) tested zeolite-supported magnetite for the removal of arsenic. This material combines good sorption affinity for oxyanions (from magnetite) with high affinity for cations (from the zeolite matrix).…”

Section: Introductionmentioning

confidence: 99%

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Removal of Molybdate Anions from Water by Adsorption on Zeolite‐Supported Magnetite

Verbinnen

Block

Hannes

et al. 2012

Water Environment Research

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Industrial wastewater may contain high molybdenum concentrations, making treatment before discharge necessary. In this paper, the removal of molybdate anions from water is presented, using clinoptilolite zeolite coated with magnetite nanoparticles. In batch experiments the influence of pH, ionic strength, possible interfering (oxy)anions, temperature and contact time is investigated. Besides determination of kinetic parameters and adsorption isotherms, thermodynamic modeling is performed to get better insight into the adsorption mechanism; molybdenum is assumed to be adsorbed as a FeOMoO 2 (OH).2H 2 O inner-sphere complex. At the optimum pH of 3, the adsorption capacity is around 18 mg molybdenum per gram adsorbent. The ionic strength of the solution has no influence on the adsorption capacity. Other anions, added to the molybdenum solution in at least a tenfold excess, only have a minor influence on the adsorption of molybdenum, with the exception of phosphate. Adsorption increases when temperature is increased. It is demonstrated that the adsorbent can be used to remove molybdenum from industrial wastewater streams, and that the limitations set by the World Health Organization (residual concentration of 70 lg/l Mo) can easily be met. Water Environ. Res., 84, 753 (2012).

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Removal of Molybdate Anions from Water by Adsorption on Zeolite‐Supported Magnetite

Verbinnen

Block

Hannes

et al. 2012

Water Environment Research

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“…(WHO, 2017) Heavy metal pollution includes metals such as arsenic, lead, nickel, tin, molybdenum, antimony, copper, selenium, which are recognised as some of the high toxicity materials, and are released into the environment by metallurgical industry effluents. (Václavíková et al, 2009) Presence of metals in wastewater has a beneficial side-effect of killing pathogens. However, if metal impurities are present in excess, they cause a problem for sludge disposal, resulting in higher process cost and environmental impact.…”

Section: Figure 2 Key Water Pollutantsmentioning

confidence: 99%

Water Pollution and Advanced Water Treatment Technologies

Mulay

Martsinovich

2022

The Palgrave Encyclopedia of Urban and Regional Futures

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 Water treatment -Treating wastewater to make it suitable for reuse, using chemical, physical, or biological methods. Advanced oxidation processes (AOPs) -Processes that involve generation of oxidising species to chemically destroy pollutants. Micropollutants -Water pollutants with concentrations of several ng/L to µg/L, usually pharmaceuticals, personal care products, pesticides and herbicides. Microplastics -Pieces of plastics with length less than 5 mm, these are emerging water pollutants in urban settings.

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“…For column applications, nanosized materials must be coated on a larger sized carrier materials. Therefore adsorbents for oxyanions, consisting of magnetite supported by a zeolite or perlite matrix were developed (Verbinnen et al, 2012(Verbinnen et al, , 2013b(Verbinnen et al, , 2015Vaclavikova et al, 2010) One of the main questions that arises when discussing adsorption is whether or not the adsorbent can be regenerated after usage. For the adsorption of oxyanion forming elements and heavy metals on adsorbents, the regeneration of the spent adsorbent is not straightforward in most cases.…”

Section: Introductionmentioning

confidence: 99%