Abatement of chlorinated compounds in groundwater contaminated by HCH wastes using ISCO with alkali activated persulfate

Santos, Aurora; Fernández, Jesús García; Rodríguez, Sergio; Lominchar, M.A.; Lorenzo, David; Salvador, Alfredo

doi:10.1016/j.scitotenv.2017.09.224

Cited by 95 publications

(23 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, biomass will be used as the main raw material of carbon source for the preparation of nano-Fe(0). This material has the potential in in-situ oxidation remediation of organic pollutants in the soil by using catalytic activation of PDS instead of traditional thermal and alkaline activation process. , …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Efficient Utilization of Nano-Fe(0) Embedded in Mesoporous Carbon for Activation of Peroxydisulfate

Chen

Han

et al. 2019

Environ. Sci. Technol.

179

View full text Add to dashboard Cite

Nanoscale zerovalent iron (nZVI) particles have received much attention in environmental science and technology due to their unique electronic and chemical properties. However, the aggregation and oxidation of nZVI brings much difficulty in practical application of environmental remediation. In this study, we reported a composite nano-Fe(0)/mesoporous carbon by a chelation-assisted coassembly and carbothermal reduction strategy. Nano-Fe(0) particles with surface iron oxide (Fe 2 O 3 •FeO) were wrapped with graphitic layers which were uniformly dispersed in mesoporous carbon frameworks. The unique structure made the nano-Fe(0) particles stable in air for more than 20 days. It was used as a peroxydisulfate (PDS) activator for the oxidation treatment of 2,4,6-trichlorophenol (TCP). The TOF value of MCFe for TCP degradation is nearly 3 times higher than those of FeSO 4 and Fe 2 O 3 •FeO and nearly 2 times than that of commercial nZVI. The reactive oxygen species (ROS) including •SO 4 − , HO•, and •O 2 − , 1 O 2 are efficiently generated by PDS activation with MCFe. The PDS activation process by nano-Fe(0) particles was intrinsically induced by the ferrous ions (Fe(II)) continuously generated at the solid/aqueous interface. Namely, the nano-Fe(0) particles were highly efficiently utilized in sulfate radical-based advanced oxidation processes (SR-AOP). The porous structure also assists the absorption and transfer of TCP during the degradation process.

show abstract

Section: Resultsmentioning

confidence: 99%

“…This material has the potential in in-situ oxidation remediation of organic pollutants in the soil by using catalytic activation of PDS instead of traditional thermal and alkaline activation process. 48,49 ■ ASSOCIATED CONTENT * S Supporting Information…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Highly Efficient Utilization of Nano-Fe(0) Embedded in Mesoporous Carbon for Activation of Peroxydisulfate

Chen

Han

et al. 2019

Environ. Sci. Technol.

179

View full text Add to dashboard Cite

show abstract

“…(8) and ( 9). The addition of an alkali provoked that HCH and heptachlorocyclohexane isomers adsorbed into the soil as a residual phase were converted to trichlorobenzenes and tetrachlorobenzenes, respectively, in less than 48 h. The dehydrochlorination reactions at alkaline conditions, shown in Figure 10, were previously described elsewhere [50][51][52].…”

Section: Oxidation With Activated Persulfate Fenton Reagent and Permanganatementioning

confidence: 72%

HCH-Contaminated Soils and Remediation Technologies

López¹,

Torre²,

Fernández³

2021

Soil Contamination - Threats and Sustainable Solutions

View full text Add to dashboard Cite

The production of lindane (gamma isomer of hexachlorocyclohexane, γ-HCH) in the second half of the twentieth century was an inefficient process that generated vast amounts of residues of other HCH isomers, without any pesticide activity. These residues were often dumped in an uncontrolled way or unsecured landfills in points near the production sites, causing hot spots of soil and groundwater contamination on all continents. Given the persistence and hydrophobicity of these pollutants, the problem generated decades ago is still a challenge to be solved. Several technologies, based on physical, chemical, and biological treatments, have been proposed for the remediation of HCH-contaminated soils. This chapter reviews the particularities of this kind of contamination and critically examines the bases and results of the technologies applied, paying special attention to the physicochemical remediation processes.

show abstract

“…The groundwater pH directly affected the chemical oxidant reactivity, the DO concentration determined the activity and activation ability of the water and gases, and the EC correlated strongly with the ion concentrations. 40,41 The pollutant concentrations decreased as the pollutants reacted with Na 2 S 2 O 8 , and the free energy at the interface of the chemical system and the diffusion capacity decreased, so the EC and DO concentration in the groundwater became less variable. The pH, EC, and DO concentration eventually became stable when the Na 2 S 2 O 8 was consumed and the reaction was completed because of groundwater excretion and recharge.…”

Section: Resultsmentioning

confidence: 99%

Decontamination of dense nonaqueous-phase liquids in groundwater using pump-and-treat andin situchemical oxidation processes: a field test

et al. 2021

View full text Add to dashboard Cite

show abstract

Abatement of chlorinated compounds in groundwater contaminated by HCH wastes using ISCO with alkali activated persulfate

Cited by 95 publications

References 25 publications

Highly Efficient Utilization of Nano-Fe(0) Embedded in Mesoporous Carbon for Activation of Peroxydisulfate

Highly Efficient Utilization of Nano-Fe(0) Embedded in Mesoporous Carbon for Activation of Peroxydisulfate

HCH-Contaminated Soils and Remediation Technologies

Decontamination of dense nonaqueous-phase liquids in groundwater using pump-and-treat andin situchemical oxidation processes: a field test

Contact Info

Product

Resources

About