Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium–silver and magnesium–palladium bimetallic systems

Patel, Upendra D.; Suresh, S.

doi:10.1016/j.jhazmat.2007.12.021

Cited by 27 publications

(16 citation statements)

References 34 publications

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“…Gautam and Sumathi (2007) reported a second-order degradation reaction of DDT using a Mg/Pd bimetallic system. Patel and Sumathi (2008) also reported second-order degradation reactions for the degradation of PCP using Mg/Pd and Mg/ Ag systems. Engelmann et al (2001) and Gautam and Sumathi (2007) conducted studies with the Mg 0 /Pd +4 system using water:acetone as a solvent medium for DDT degradation and reported the complete removal of the chlorine atoms in an acidic medium.…”

Section: Resultsmentioning

confidence: 98%

“…Previous reports also suggest that the suitable solvent is required to enhance the rate of degradation of chlorinated pesticides by accelerating the mass transfer. Patel and Sumathi (2008) used various co-solvents (acetone, methanol, ethanol, 1-propenol and no solvent) at 1% (v/v) for 10 mg/L pentachlorophenol (PCP) degradation. Maximum removal of PCP was achieved in the presence of acetone using Mg/Ag and Mg/Pd systems with 1 hour of reaction time.…”

Section: Resultsmentioning

confidence: 99%

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Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System

Aginhotri

Mahidrakar

Gautam

2011

Water Environment Research

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A Mg°/Pd'^ bimetallic system was evaluated to dechlorinate endosulfan and lindane in the aqueous phase. Studies were conducted with endosulfan and lindane separately, with or without acid in a 1:1 (v/v) water:acetone phase. In the absence of any acid, higher degradation of endosulfan and lindane was observed using Mg°/Pd*'* doses of 10/0.5 and 4/0.1 mg/mL, respectively. Acetone plays an important role in facilitating the dechiorination reaction by increasing tbe solubilities of pesticides. Dechiorination kinetics for endosulfan and lindane (30 and 50 mg/L [30 and 50 ppm] concentration of each pesticide) were conducted with varying Mg^/Pd^ doses, and the timecourse profiles were well-fitted into exponential curves. The optimum observed rate constants {kobs) for endosulfan and lindane were obtained with Mg''/Pd*'' doses of 5/0.5 and 4/0.1 mg/mL, respectively. Gas cbromatography-mass spectrometry analyses revealed that endosulfan and lindane were dechlorinated completely into their hydrocarbon skeletons-Bicyclo [2,2,1] hepta 2-5 diene and benzene, respectively. Water Environ. Res., 83, 865 (2011).

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System

Aginhotri

Mahidrakar

Gautam

2011

Water Environment Research

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“…In addition to the selection of a base metal, the choice of catalytic metal can improve treatment effectiveness by increasing the galvanic potential difference between the pair. Some researchers have utilized noble metals to increase the galvanic potential difference such as Pd, Ag, and Au (Cwiertny et al, 2006;DeVor et al, 2008;Patel and Suresh, 2008;Coutts et al, 2011;Saitta et al, 2015). Catalytic metal selection criteria may be expanded to include economic (e.g.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Mg-based bimetal treatment of insensitive munition 2,4-dinitroanisole

Hadnagy

Mai

Smolinski

et al. 2018

Environ Sci Pollut Res

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The manufacturing of insensitive munition 2,4-dinitroanisole (DNAN) generates waste streams that require treatment. DNAN has been treated previously with zero-valent iron (ZVI) and Fe-based bimetals. Use of Mg-based bimetals offers certain advantages including potential higher reactivity and relative insensitivity to pH conditions. This work reports preliminary findings of DNAN degradation by three Mg-based bimetals: Mg/Cu, Mg/Ni, and Mg/Zn. Treatment of DNAN by all three bimetals is highly effective in aqueous solutions (> 89% removal) and wastewater (> 91% removal) in comparison with treatment solely with zero-valent magnesium (ZVMg; 35% removal). Investigation of reaction byproducts supports a partial degradation pathway involving reduction of the ortho or para nitro to amino group, leading to 2-amino-4-nitroanisole (2-ANAN) and 4-amino-2-nitroanisole (4-ANAN). Further reduction of the second nitro group leads to 2,4-diaminoanisole (DAAN). These byproducts are detected in small quantities in the aqueous phase. Carbon mass balance analysis suggests near-complete closure (91%) with 12.4 and 78.4% of the total organic carbon (TOC) distributed in the aqueous and mineral bimetal phases, respectively. Post-treatment surface mineral phase analysis indicates Mg(OH) as the main oxidized species; oxide formation does not appear to impair treatment.

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“…Some environmentally significant physical-chemical properties of CPs are presented in Table 1 [15]. Several methods have been developed for treating CP-contaminated media, including sonication, ozonation [16][17][18], electrochemical treatment [6,19], advanced chemical oxidation by Fenton's reagent [4,20], advanced oxidation [4], bioremediation [18,[21][22][23], phytodegradation [24], reductive dechlorination by zero valent metals [5,[25][26][27][28][29][30][31] and sorption by materials, such as almond shell residues [32], coal fly ash [33], and biosorbents [34,35]. Furthermore, combinations of treatments have also been used to enhance CP degradation.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review

Gunawardana¹,

Singhal²,

Swedlund³

2011

Environmental Engineering Research

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Chlorophenols (CPs) are widely used industrial chemicals that have been identified as being toxic to both humans and the environment. Zero valent iron (ZVI) and iron based bimetallic systems have the potential to efficiently dechlorinate CPs. This paper reviews the research conducted in this area over the past decade, with emphasis on the processes and mechanisms for the removal of CPs, as well as the characterization and role of the iron oxides formed on the ZVI surface. The removal of dissolved CPs in iron-water systems occurs via dechlorination, sorption and co-precipitation. Although ZVI has been commonly used for the dechlorination of CPs, its long term reactivity is limited due to surface passivation over time. However, iron based bimetallic systems are an effective alternative for overcoming this limitation. Bimetallic systems prepared by physically mixing ZVI and the catalyst or through reductive deposition of a catalyst onto ZVI have been shown to display superior performance over unmodified ZVI. Nonetheless, the efficiency and rate of hydrodechlorination of CPs by bimetals depend on the type of metal combinations used, properties of the metals and characteristics of the target CP. The presence and formation of various iron oxides can affect the reactivities of ZVI and bimetals. Oxides, such as green rust and magnetite, facilitate the dechlorination of CPs by ZVI and bimetals, while oxide films, such as hematite, maghemite, lepidocrocite and goethite, passivate the iron surface and hinder the dechlorination reaction. Key environmental parameters, such as solution pH, presence of dissolved oxygen and dissolved co-contaminants, exert significant impacts on the rate and extent of CP dechlorination by ZVI and bimetals.

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Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium–silver and magnesium–palladium bimetallic systems

Cited by 27 publications

References 34 publications

Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System

Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System

Characterization of Mg-based bimetal treatment of insensitive munition 2,4-dinitroanisole

Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review

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Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium–silver and magnesium–palladium bimetallic systems

Cited by 27 publications

References 34 publications

Complete Dechlorination of Endosulfan and Lindane Using Mg0/Pd+4 Bimetallic System

Complete Dechlorination of Endosulfan and Lindane Using Mg0/Pd+4 Bimetallic System

Characterization of Mg-based bimetal treatment of insensitive munition 2,4-dinitroanisole

Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review

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Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System

Complete Dechlorination of Endosulfan and Lindane Using Mg⁰/Pd⁺⁴ Bimetallic System