Sökning: "chromium VI"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden chromium VI.

  1. 1. Functionalized nanomaterials for the removal of chromium (VI) from aqueous solutions

    Författare :Terrance Burks; Mamoun Muhammed; Kastriot Spahiu; KTH; []
    Nyckelord :adsorption; chromium VI ; extractant; nanofiber; superparamagnetic iron oxide nanoparticle SPION ;

    Sammanfattning : .... LÄS MER

  2. 2. Application of Nanomaterials for the Removal of Hexavalent Chromium and their Biological Implications

    Författare :Terrance Burks; Yohannes Kiros; Arunachalanadar Madakannan; KTH; []
    Nyckelord :Nanomaterials; Chromium; Biology; Chemical Engineering; Kemiteknik;

    Sammanfattning : The International Agency for Research on Cancer (IARC) stated that chromium in the form of Cr(VI) has been deemed to be a class-A human carcinogen. It has been a major contaminant associated with wastewater. LÄS MER

  3. 3. Oxygen formation in the chlorate process and preparation and deactivation of ozone selective anodes

    Författare :Staffan Sandin; Ann M. Cornell; Paul Christensen; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; NATO; EOP; ozone; electrode preparation; elec- trode deactivation; hypochlorite; chlorate; oxygen; chromium VI ; sodium dichromate; electrocatalysis; catalysis; Chemical Engineering; Kemiteknik;

    Sammanfattning : This thesis presents experimental studies concerning two differ-ent electrolytic processes. One part deals with the electrochemicalformation of ozone and focuses on the preparation and deactiva-tion of a highly ozone-selective metal oxide anode (NATO - nickeland antimony doped tin oxide). LÄS MER

  4. 4. Efficiency and Selectivity in the Chlorate Process

    Författare :Aleksandra Lindberg; Ann Cornell; Susanne Holmin; Eva Blomberg; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrolysis; chlorate process; anodes; cathodes; selectivity; chromate; chromium VI ; DSA; HER; OER; ClER; oxygen; chlorate; hypochlorite; electrocatalysis; catalysis; Chemical Engineering; Kemiteknik;

    Sammanfattning : This licentiate thesis presents experimental studies concerning two parts of the electrochemical cell in the chlorate process: a cathode and an anode.Newly synthesized MnOx electrodes were investigated for the cathodic reaction, hydrogen evolution reaction (HER) in the chlorate process. LÄS MER

  5. 5. Liquid Membrane Techniques for Trace Metal Analysis and Speciation in Environmental and Biological Matrices

    Författare :Kuria Ndung'u; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Pb and Organotin species; MMLLE; SLM; GC MS; PSA; GFAS; FAAS; ICP-MS; Speciation; DEHPA; Aliquat-336; trace metals; Cr III ; Cr VI ; Analytisk kemi;

    Sammanfattning : In this thesis, liquid-membrane-based methods for the analysis of trace metal species in samples of environmental and biological origin were developed. By incorporating extracting reagents in the membrane liquid, trace metal ions were selectively separated from humic-rich natural waters and urine samples, prior to their determination using various instrumental techniques. LÄS MER