Pular para o conteúdo principal
Início

Dedicated to discovery

  • Sobre a ELGA
    • Sobre a ELGA
    • Carreiras
    • Eventos
  • Apoio
    • Planeamento laboratorial
  • Contacto
  • EN
  • DE
  • ES
  • FR
  • IT
  • EN-US
Início
  • Produtos
    • PURELAB
      • PURELAB® Dispenser
      • PURELAB® Flex
      • PURELAB® Quest
      • PURELAB® Pharma Compliance
      • PURELAB® Chorus 1 Complete
      • PURELAB® Chorus 1
      • PURELAB® Chorus 2
      • PURELAB® Chorus 3
      • PURELAB® Chorus 2 +
    • CENTRA
      • CENTRA® R60/120
      • CENTRA® R200
      • CENTRA® RDS
    • MEDICA
      • MEDICA® 150
      • MEDICA® 7/15
      • MEDICA® BIOX 2024
      • MEDICA® Pro-R & Pro-RE
      • MEDICA® R200
      • MEDICA® EDI 15/30
      • MEDICA® Pro-LPS
      • MEDICA® Pro EDI 60/120
      • MEDICA® BIOX
      • Hubgrade
    • BIOPURE
      • BIOPURE® 300/600
    • PURENERGY® 30
    • Gama completa dos produtos ELGA
  • Aplicações
    • Análise microbiológica
    • Bioquímica Clínica
    • Cromatografia gasosa
    • Cromatografia líquida
      • High Performance Liquid Chromatography
    • Culturas de célula
    • Eletroquímica
    • Espectrofotometria
    • Espectrometria de massa
    • Espectroscopia Atómica
    • Genética
    • High Performance Liquid Chromatography (HPLC)
    • Imunoquímica
    • Requisitos de água para laboratório em geral
  • Tecnologias
    • Carbono ativado
    • Eletrodeionização (EDI)
    • Filtração
    • Osmose Reversa
    • PureSure
    • Troca iónica
    • Ultravioleta
  • Impurezas na água
    • Compostos biológicos
    • Compostos inorgânicos
    • Gases dissolvidos
    • Microrganismos e bactérias
    • Partículas
  • Conhecimento
    • BROSCHÜREN
    • Blogue
    • Estudos de caso
    • Água ultrapura
    • Guias e Livros brancos
  • Where to buy
  • Contacto
Home
  • Contacto
  • Produtos
    • PURELAB
      • PURELAB® Dispenser
      • PURELAB® Flex
      • PURELAB® Quest
      • PURELAB® Pharma Compliance
      • PURELAB® Chorus 1 Complete
      • PURELAB® Chorus 1
      • PURELAB® Chorus 2
      • PURELAB® Chorus 3
      • PURELAB® Chorus 2 +
    • CENTRA
      • CENTRA® R60/120
      • CENTRA® R200
      • CENTRA® RDS
    • MEDICA
      • MEDICA® 150
      • MEDICA® 7/15
      • MEDICA® BIOX 2024
      • MEDICA® Pro-R & Pro-RE
      • MEDICA® R200
      • MEDICA® EDI 15/30
      • MEDICA® Pro-LPS
      • MEDICA® Pro EDI 60/120
      • MEDICA® BIOX
      • Hubgrade
    • BIOPURE
      • BIOPURE® 300/600
    • PURENERGY® 30
    • Gama completa dos produtos ELGA
  • Aplicações
    • Análise microbiológica
    • Bioquímica Clínica
    • Cromatografia gasosa
    • Cromatografia líquida
      • High Performance Liquid Chromatography
    • Culturas de célula
    • Eletroquímica
    • Espectrofotometria
    • Espectrometria de massa
    • Espectroscopia Atómica
    • Genética
    • High Performance Liquid Chromatography (HPLC)
    • Imunoquímica
    • Requisitos de água para laboratório em geral
  • Tecnologias
    • Carbono ativado
    • Eletrodeionização (EDI)
    • Filtração
    • Osmose Reversa
    • PureSure
    • Troca iónica
    • Ultravioleta
  • Impurezas na água
    • Compostos biológicos
    • Compostos inorgânicos
    • Gases dissolvidos
    • Microrganismos e bactérias
    • Partículas
  • Conhecimento
    • BROSCHÜREN
    • Blogue
    • Estudos de caso
    • Água ultrapura
    • Guias e Livros brancos
  • Where to buy
  • Contacto
  • Sobre a ELGA
    • Sobre a ELGA
    • Carreiras
    • Eventos
  • Apoio
    • Planeamento laboratorial
  • Contacto
  • EN
  • DE
  • ES
  • FR
  • IT
  • EN-US
  • Política de privacidade
  • Termos e condições
  • Conformidade legal global
  • Patentes
  • Trademarks
  • Impressum
  • Gum Karaya Stabilised Nanoscale Zero-Valent Iron For Water Treatment - Czech Republic
Analytical Chemistry
Environment & Sustainability

Gum Karaya Stabilised Nanoscale Zero-Valent Iron For Water Treatment - Czech Republic

4 out 2021
- by ELGA Editorial Team

View of the Vltava River and Charle bridge with red foliage, Prague, Czech Republic

Nanoscale zero-valent iron (NZVI) is a popular technology that has been investigated for the remediation of contaminated water due to its high reactivity towards a wide range of contaminants.

Researchers at the Czech Academy of Sciences and the Technical University of Liberec in the Czech Republic, Glyndwr University in Wales, and Mangalore University in India have studied gum karaya (GK) – a natural polysaccharide and hydrocolloid gum obtained from the karaya tree – as an inexpensive and environmentally friendly material for NZVI stabilisation that can be used for water treatment.

NZVI has been reported to be reactive with chlorinated, nitro and aromatic organic compounds, as well as heavy metals and radioactive nuclides – the list is endless. To be effective for remediation technology, NZVI particles need to move freely for a long time without aggregating in aqueous environments. Their mobility can often be restricted due to interactions between the iron (Fe) particles and other residues in the water, resulting in lowered specific surface area and subsequently causing reduced reactivity and stability. Potential solutions to overcome these challenges have looked at modification of the surface properties of NZVI using a combination of natural and engineered polymers, together with surfactants that are non-toxic, biodegradable, and have superior physicochemical properties.

GK has been used for centuries as a food additive – for promoting emulsification, stabilisation and thickening – and a pharmaceutical ingredient. It is known to contain sugars such as rhamnose, galactose and arabinose, which have various functional moieties, including hydroxyl and carboxylic groups. These play a crucial role in binding of toxic metal ions from aqueous solutions to the gum biopolymer structure, making GK useful as a natural biosorbent. Researchers at the Czech Academy of Sciences and the Technical University of Liberec in the Czech Republic, Glyndwr University in Wales, and Mangalore University in India have assessed the stability, sedimentation, aggregation behaviour and reactivity of NZVI–GK (GK stabilised NZVI) and bare NZVI towards chromium (Cr) species and volatile organic compounds (VOCs) in contaminated water.1

Sample Preparation and Analysis

GK powder was purified, and the molar mass distribution and radius properties determined. Nanoparticles of zero-valent iron were activated using standard protocols based on preparation of a 20 % slurry by dispersing air-stable NZVI in ELGA® ultrapure water of resistivity of 18.2 MΩ/cm, prepared using a PURELAB® flex system. The activated particles, Fe(0), were mixed in various ratios with purified GK to produce NZVI–GK suspensions before adjusting to different pH conditions (2–10) with 1.0 N NaOH or HCl. The stability, sedimentation, aggregation behaviour and reactivity of NZVI–GK and bare NZVI towards Cr(VI), Cr(III) and VOCs – cis-1,2-dichloroethane, perchloroethene and trichloroethene – in ground water from the Pisecna region of the Czech Republic were assessed. The stabilisation mechanism of NZVI–GK was demonstrated using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and particle size analysis using inductively coupled plasma mass spectrometry (ICP-MS).

The Results

The NZVI–GK nanoparticle suspension was found to be stable for at least three months, suggesting that GK has a superior stability rendering property that forms a scaffold to prevent NZVI from aggregating or sedimentation. Batch experiments confirmed that NZVI–GK was more reactive than bare NZVI. XPS and ICP-MS results revealed that Cr(VI) was reduced to Cr(III) by NZVI–GK and the remaining Cr(III) in solution was adsorbed onto the GK polymer, therefore completely removing chromium from the contaminated water. The study suggests that the properties of GK play an important role, in conjunction with NZVI, to remove all chromium and VOCs from water.

Future Applications

This study is a stepping stone for future research of NZVI-GK, and modifications of NVZI to enhance or tailor the properties to potentially completely eliminate other common contaminants in water. This will not only be beneficial for larger scale treatment of water supplied to our homes and for drinking, but, also for the removal of toxic chemicals that may disperse, leach or directly contaminate the habitats of other living organisms, such as surface or ground waters.

Why Choose ELGA LabWater in the Czech Republic?

The presence of impurities in laboratory water can be a major problem in research experiments, and can seriously compromise results. ELGA LabWater has been a trusted name in pure and ultrapure water since 1937. We believe in providing you with water purification solutions that can meet a wide range of needs and applications, backed by excellent service and support. For more information on our Type I ultrapure water systems, check out our PURELAB Quest, PURELAB Chorus 1 Complete and our PURELAB flex models.

 

1  Vinod, V. T. P et al. 2017. Gum karaya (Sterculia urens) stabilized zero-valent iron nanoparticles: characterization and applications for the removal of chromium and volatile organic pollutants from water. RSC Adv 7(23):13997-14009.

Contact our czech partners here 

  • Sales Enquiry
  • Obter uma cotação
  • Technical Support
  • Encontre um parceiro aprovado

Sales Enquiry

At ELGA LabWater, we have exciting offers and news about our products and services that we hope you’d like to hear about. We will use your information to predict what you might be interested in. We will treat your data with respect and you can find the details in our Privacy Policy.

ELGA LabWater works with a network of Approved Partners. In order to answer your questions or enquiries, we may pass your contact details to an Approved Partner, who may contact you directly. 

I'd like to receive updates from ELGA LabWater & ELGA Approved Partners based on my details.

Obter uma cotação

At ELGA LabWater, we have exciting offers and news about our products and services that we hope you’d like to hear about. We will use your information to predict what you might be interested in. We will treat your data with respect and you can find the details in our Privacy Policy.

ELGA LabWater works with a network of Approved Partners. In order to answer your questions or enquiries, we may pass your contact details to an Approved Partner, who may contact you directly. 

I'd like to receive updates from ELGA LabWater & ELGA Approved Partners based on my details.

Technical Support

At ELGA LabWater, we have exciting offers and news about our products and services that we hope you’d like to hear about. We will use your information to predict what you might be interested in. We will treat your data with respect and you can find the details in our Privacy Policy.

ELGA LabWater works with a network of Approved Partners. In order to answer your questions or enquiries, we may pass your contact details to an Approved Partner, who may contact you directly. 

Call us

Can't find what you are looking for?

Support Number
+44 (0)20 3567 7300
United Kingdom Sales
+44 (0)1628 879 704
United States of America Sales
+1 877-315-3542
France Sales
+33 1 40 83 65 00
China Sales
+86 400-616-8882

 

Sede da ELGA LabWater

Lane End Business Park
Lane End, High Wycombe
HP14 3BY
Reino Unido
T: +44 (0) 203 567 7300
F: +44 (0) 203 567 7205

Estudos de caso

  • Abbott Diagnostics
  • DASA Medical Diagnostics
  • NeoDIN Medical Institute
  • North Staffordshire NHS Trust
  • Olsberg Vocational College

Recursos

  • Saber mais sobre água ultrapura
  • Guias e Livros Brancos
  • Tecnologias de purificação
  • Aplicações
  • Impurezas na água
  • Latest Blog
  • Water Purity - Different Types of Pure Water
  • What is Clinical Laboratory Reagent Water (CLSI)?
  • What is Total Organic Carbon (TOC)?

© VWS (UK) Ltd. negociando como ELGA LabWater.2025-Todos os direitos reservados.
ELGA é a marca global de água para laboratórios da Veolia.

  • Política de privacidade
  • Termos e condições
  • Conformidade legal global
  • Patentes
  • Trademarks
  • Impressum
  • Idioma
    • Deutsch
    • English
    • Español
    • Français
    • Italiano
    • Português
    • 日本語
    • 中文
  • Outros sítios Web da Veolia
    • Veolia
    • Veolia Foundation
    • Veolia Water Technologies
Elga Veolia
TOP

© 2017 ELGA Veolia