Zero-valent iron (ZVI) and rice husk (RH) have potential as adsorbents for heavy metals; however, their effects on plaque formation metal uptake by plants are still unclear. In this study, the impacts of ZVI, RH combinations root surface As Cd were investigated. A pot experiment was performed under waterlogged conditions using As(III)- or Cd(II)-spiked soil. The results showed that ZVI (0.05% 0...

The heterogeneous Fenton-like reaction has been receiving increasing attention for its inexpensiveness and high efficiency in water treatment. In this study, a novel strategy was proposed preparing spherical ZVI/Mn-C bimetallic catalysts with activity by using the ammonium alginate assisted sol–gel method coupled carbothermic reduction. results showed that obtained spheres had uniform size, smo...

The Zero Valent Iron (ZVI) is the material most commonly used for permeable reactive barriers (PRB). For technical and economic reasons, hoter reactive substances usable in alternative to ZVI are investigated. The present study takes into account a vegetable fibers, the cabuya, investigating its capacity to retain heavy metals. The capacity of the cabuya fibers to adsorb heavy metals was verifi...

Biological reduction of perchlorate by autotrophic microorganisms attached to zerovalent iron (ZVI) was studied in flow-through columns. The effects of pH, flow rate, and influent perchlorate and nitrate concentrations on perchlorate reduction were investigated. Excellent perchlorate removal performance (> or = 99%) was achieved at empty bed residence times (EBRTs) ranging from 0.3 to 63 h and ...

Flow-through columns packed with "aged" zero-valent iron (ZVI) between layers of soil and sand were constructed to mimic a one-dimensional permeable reactive iron barrier (PRB). The columns were continuously fed RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine, ca. 18 mg l(-1)) for over one year. Two columns were bioaugmented with dissimilatory iron reducing bacteria (DIRB) Shewanella algae BrY or ...

The development of slow-release chemical oxidants for sub-surface remediation is a relatively new technology. Our objective was to develop slow-release persulfate-paraffin candles to treat BTEX-contaminated groundwater. Laboratory-scale candles were prepared by heating and mixing Na(2)S(2)O(8) with paraffin in a 2.25 to 1 ratio (w/w), and then pouring the heated mixture into circular molds that...

Permeable reactive barriers (PRBs) based on the use of zero valent iron (ZVI) represent an efficient technology for remediation contaminated groundwater, but literature evidences “failures”, often linked to difficulty fully understanding long-term performance ZVI-based PRBs in terms their hydraulic behavior. The aim this paper is provide overview behavior composed ZVI mixed with other or inert ...

Permeable reactive barrier (PRB) containing zero valent iron (ZVI), plaster and additives to make a porous composite structure, was tested remove an organic nitro compound as model pollutant. An aqueous solution of 4-nitroaniline (PNA) passed through column chemical degradation quantified by UV-Vis spectroscopy. PNA reduced p-phenylenediamine the rate reduction strongly related ZVI amount, poll...

Prof. Assaf Friedler was born in Haifa, Israel, in 1971. He did his undergraduate studies in chemistry at the Hebrew University of Jerusalem, and Ph.D studies in chemistry at the Hebrew University of Jerusalem under the supervision of Prof. Chaim Gilon, in peptide chemistry and medicinal chemistry. After receiving his PhD degree, in 2000, Prof. Friedler moved to Cambridge, UK, to do his post-do...

John T. Wilson While biologically mediated reductive dechlorination continues to be a significant focus of chlorinated solvent remediation, there has been an increased interest in abiotic reductive processes for the remediation of chlorinated solvents. In situ chemical reduction (ISCR) uses zero-valent iron (ZVI)–based technologies, such as nanoscale iron and bimetallic ZVI, as well as naturall...