Screening of zero valent mono/bimetallic catalysts and recommendation of Raney Ni (without reducing agent) for dechlorination of 4-chlorophenol

Raut, Sandesh S.; Shetty, Rohit; Raju, Nikhi Maria; Kamble, Sanjay P.; Kulkarni, Prashant S.

doi:10.1016/j.chemosphere.2020.126298

Cited by 19 publications

(20 citation statements)

References 33 publications

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“…A first order model was chosen for the kinetic evaluation of the HDC process, as is frequently the case in literature for reactions of Ar-Cls with electropositive metals [3,4,6,[9][10][11][12][14][15][16]. High values of R 2 (Table 2) obtained fitting of the time dependences for HDC of Cl-ANs using the Raney Al-Ni alloy without glucose, confirm the fact that this reaction follows the first order kinetic model.…”

Section: Dechlorination Of Chlorinated Anilinesmentioning

confidence: 55%

“…Chlorinated phenols are common aquatic pollutants due to their biocidal properties and solubility in water [5][6][7]10,12,14,15,17,18,20,[26][27][28][29]31]. Due to this reason the possible reductive degradation of several chlorinated phenols was studied via HDC process testing both Devarda's Al-Cu-Zn and Raney Al-Ni alloys.…”

Section: Dechlorination Of Chlorinated Phenolic Compoundsmentioning

confidence: 99%

“…As Ar-Cls have been so widely used they can be found in nearly all major environmental compartments. Ar-Cls contaminate aqueous industrial effluents and subsequently polluted ground and underground water which is caused by their high stability in the environment with a tendency to accumulate in animal tissues [6,7]. The toxicity of Ar-Cls mainly arises from bound chlorine(s), while chlorine-free aromatic compounds are not only less toxic but can also be completely degraded by biological processes (or possibly recycled as industrial raw materials) [7].…”

Section: Introductionmentioning

confidence: 99%

“…For effective HDC reaction, researchers have tested monometallic (Al, Fe, Mg, Zn) [4][5][6]8] or bimetallic metal systems by plating of electropositive metal surfaces with platinum or palladium (Pt/Fe, Pd/Fe, Pd/Mg, Pd/Al) [3,5,[8][9][10][11][12][13]. In the case of non-plated electropositive metal application, the kinetic of HDC of Ar-Cls is extremely slow even using nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…Due to these above-mentioned reasons, less expensive bimetallic reductants have been tested in recent years based on nickel or copper in the role of HDC catalysts for plating of electropositive metals Cu/Al, Cu/Fe, Ni/Fe, Ni/Zn and Cu/Zn [3,6,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Hydrodechlorination of Different Chloroaromatic Compounds at Room Temperature and Ambient Pressure—Differences in Reactivity of Cu- and Ni-Based Al Alloys in an Alkaline Aqueous Solution

et al. 2020

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It is well known that the hydrodechlorination (HDC) of chlorinated aromatic contaminants in aqueous effluents enables a significant increase in biodegradability. HDC consumes a low quantity of reactants producing corresponding non-chlorinated and much more biodegradable organic compounds. Two commonly used precious metals free Al alloys (Raney Al-Ni and Devarda’s Al-Cu-Zn) were compared in reductive action in an alkaline aqueous solution. Raney Al-Ni alloy was examined as a universal and extremely effective HDC agent in a diluted aqueous NaOH solution. The robustness of Raney Al-Ni activity is illustrated in the case of HDC of polychlorinated aromatic compounds mixture in actual waste water. In contrast, Devarda’s Al-Cu-Zn alloy was approved as much less active for HDC of the tested chlorinated aromatic compounds, but with a surprisingly high selectivity on cleavage of C-Cl bonds in the meta and sometimes the ortho position in chlorinated aniline and sometimes chlorinated phenol structures. The reaction of both tested alloys with chlorinated aromatic compounds in the aqueous NaOH solution is accompanied by dissolution of aluminum. Dissolved Al in the alkaline HDC reaction mixture is very useful for subsequent treatment of HDC products by coagulation and flocculation of Al(OH)3 caused by simple neutralization of the alkaline aqueous phase after the HDC reaction.

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