Application of electrochemical depassivation in PRB systems to recovery Fe0 reactivity

Lu, Xin; Li, Miao; Deng, Hao; Lin, Pengfei; Matsumoto, Mark R.; Liu, Xiang

doi:10.1007/s11783-016-0843-0

Cited by 11 publications

(3 citation statements)

References 20 publications

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“…Since at low pH the adsorbent surface remains protonated, hence the anionic Cr species are adsorbed on the surface through electrostatic interaction [ 37 ]. It has been shown that in an aqueous medium, Cr may exist in different ionic forms such as chromate (CrO 4 −2 ), dichromate (Cr 2 O 7 − ), and hydrogen chromate (HCrO 4 − ), which primarily depend upon the pH of the medium [ 38 ]. Generally, under acidic medium, the predominant oxy anionic Cr species are HCrO 4 − and Cr 2 O 7 −2 ions, whereas under basic medium, the CrO 4 −2 is more stable [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

et al. 2020

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The present study focuses on fabrication of magnetic activated carbon (M-AC) using tire waste and its potential investigation for adsorption of Cr (VI) from wastewater. The composite material (M-AC) was synthesized by pyrolysis followed by in situ magnetization method, and characterized by FTIR, FESEM, EDX, and XRD analysis. The maximum adsorption of Cr (VI) ion over composite adsorbent was found (~99.5%) to occur at pH 2, sample volume 10 mL, adsorbent dose 100 mg, contact time 30 min. The adsorption process was endothermic, feasible, spontaneous, and was found to follow pseudo second order of the reaction. The Cr ion could be completely desorbed (~99.3%) from the composite adsorbent by using 20 mL of 2 M NaOH solution. The composite adsorbent was regenerated by continuous adsorption and desorption for 5 consecutive cycles by using 10 mL 0.1 M HCl solution. M-AC also performed well in case of tannery wastewater by removing about 97% of Cr (VI).

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Section: Resultsmentioning

confidence: 99%

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

et al. 2020

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“…Some simple tests have been presented (Reardon 1995(Reardon , 2005Noubactep et al 2009a;Noubactep 2011aNoubactep , 2012bLi et al 2016) whose adoption would accelerate the understanding of Fe 0 /H 2 O systems. However, properly modeling the behavior of Fe 0 filters goes exclusively through the characterization of the long-term kinetics of relevant particles and field conditions (Lu et al 2016;Sun et al 2016). 2+ species are reported to form hydrous ferric oxide (HFO) upon oxidation and As adsorbed on HFO is efficiently removed by a (subsequent) sand filtration (Gottinger et al 2013;Kowalski and Søgaard, 2014;Wan et al 2016).…”

Section: Designing Fe 0 Filters From Laboratory Datamentioning

confidence: 99%

“…In this context, Fe 0 is currently regarded as (1) a reductant for some species, (2) an adsorbent for other species, (3) a coagulant for various anionic species (Richardson and Nicklow 2002;Noubactep 2010a;Shrimpton et al 2015;Lu et al 2016;Sun et al 2016;Xu et al 2016) and (4) a long-term supplier of Fe 2+ for activation of oxidation processes (Liang and Guo 2010;Segura et al 2015;Lee et al 2014;Lin et al 2016). The properties making Fe 0 suitable for environmental remediation include: (1) its readily availability and (2) its environmental friendliness implying the generation of non-toxic hydroxides and oxides.…”

Section: Introductionmentioning

confidence: 99%