Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Fukushima, Masami; Miura, Akitaka; Sasaki, Masahide; Izumo, Kenji

doi:10.1016/j.molstruc.2008.07.006

Cited by 38 publications

(18 citation statements)

References 34 publications

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“…corresponding to C=C double bonds in aromatic moieties [11]. The peak at 275 nm for the control sample was assigned to the π→π * electron transition of catechol, and this peak was remained in the spectra of reaction mixtures for the HNO 3 and HF treated slag samples, indicating that polycondensation reactions of humic precursors were not extensive for these samples.…”

Section: Catalytic Activities For Slag Samplesmentioning

confidence: 95%

“…Powdered HLA was obtained by freeze-drying. The low-molecular-weight byproducts in the acidified supernatant were analyzed by the GC/MS after extraction with ethyl acetate, as described in a previous report [11].…”

Section: Separation and Analyses Of Humic-like Acidsmentioning

confidence: 99%

“…In general, the E 600 increases with the extent of darkening of the reaction mixture in a polycondensation reaction [28]. The E 600 value can be calculated from the light absorption coefficient at 600 nm, using the following equation [11,13,14]: Figure 3 shows the kinetic curves for the variations in E 600 value. The E 600 values in the presence of the untreated slag were much larger than those in its absence (control),…”

Section: Catalytic Activities For Slag Samplesmentioning

confidence: 99%

“…In polycondensation reactions of humic precursors, the nitrogen in amino acids can add to nucleophilic carbons in aromatic rings and carbonyl carbons [11,14]. Bosetto et al [31] reported that C/N ratios and molecular weights of humification products produced via the Maillard reaction of glucose and glycine decreased and increased during the incubation, respectively.…”

Section: Catalytic Activities For Slag Samplesmentioning

confidence: 99%

“…In addition, oxides of Si, Mn, Al and Fe have also been reported to facilitate the darkening of reaction mixtures that contain humic precursors [10,11]. While allophanic soil, zeolites and bentonite are also able to enhance theses reactions, their effects can be attributed to the fact that transition metals such as Ti and Fe that are present in the minerals, serve as Lewis acid catalysts, which also promote such polycondensation reactions [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effects of surface Fe(III) oxides in a steel slag on the formation of humic-like dark-colored polymers by the polycondensation of humic precursors

Nishimoto

Fukuchi

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Carbonated furnace steel slag is effective in enhancing polycondensation reactions of humic precursors such as quinones, amino acids and saccharides. To obtain more detailed information concerning the nature of the catalytic sites on the surface of slag, a pristine slag sample was treated with HNO 3 , HF and NH 2 OH to alter the surface states.The catalytic activities for the formation of humic-like dark-colored polymers were significantly decreased for the samples treated with HNO 3 or HF compared to untreated slag. Because substantial amounts of iron were eluted as the result of the HNO 3 and HF treatments, the minerals remaining on the surface of steel slag were characterized by XRD and SEM, and the results were compared with untreated slag. XRD patterns indicated the significant decrease in Fe(III) oxide content, including magnetite and hematite, as the result of the HNO 3 and HF treatment. In addition, when untreated slag 2 was reacted with humic precursors, the hematite and magnetite were largely eluted as a result of the reaction. These results support the conclusion that Fe(III)-oxides on the surface of steel slag, such as hematite and magnetite, serve as catalytic sites for enhancing catalytic activity for the formation of humic-like dark colored-polymers from humic precursors.

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Section: Catalytic Activities For Slag Samplesmentioning

confidence: 95%

Section: Separation and Analyses Of Humic-like Acidsmentioning

confidence: 99%

Section: Catalytic Activities For Slag Samplesmentioning

confidence: 99%

Section: Catalytic Activities For Slag Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of surface Fe(III) oxides in a steel slag on the formation of humic-like dark-colored polymers by the polycondensation of humic precursors

Nishimoto

Fukuchi

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Role of ferric oxide in abiotic humification enhancement of organic matter

Zhang

Yue

Lu³

et al. 2015

J Mater Cycles Waste Manag

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The significance of humification pathway as promoted by metallic oxides has previously been well investigated using a model system containing humus precursors. Metallic oxides, co-existing with organic matter in nature, are capable of promoting humification of organic matter to different degrees. This study is an investigation into the role of ferric oxide in the process of humification, based on the degree of darkening for humus precursors. Glucose (Glu), glycine (Gly) and catechol (Cat) were introduced as humification model precursors, and the role of ferric oxide in different periods of humification was discussed by characterizing humification degree in terms of dissolved organic carbon, ratio of Fulvic acids (FA) to Humic acids (HA), and E 600 . Valence changes of Fe were analyzed using X-ray photoelectron spectroscopy. The results showed that ferric oxide was effective on the conversion from FA to HA, and the effectiveness grew as the ferric oxide concentration increased. A higher pH value was more conducive to form dark substances. Amounts of Fe with various valences changed remarkably after humification, suggesting that ferric oxide was involved in the humification reaction.

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Analysis of branched-chain fatty acids in humic substances as indices for compost maturity by pyrolysis–gas chromatography/mass spectrometry with tetramethylammonium hydroxide (TMAH-py–GC/MS)

Fukushima

Aneksampant

et al. 2016

J Mater Cycles Waste Manag

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Effect of an allophanic soil on humification reactions between catechol and glycine: Spectroscopic investigations of reaction products

Cited by 38 publications

References 34 publications

Effects of surface Fe(III) oxides in a steel slag on the formation of humic-like dark-colored polymers by the polycondensation of humic precursors

Effects of surface Fe(III) oxides in a steel slag on the formation of humic-like dark-colored polymers by the polycondensation of humic precursors

Role of ferric oxide in abiotic humification enhancement of organic matter

Analysis of branched-chain fatty acids in humic substances as indices for compost maturity by pyrolysis–gas chromatography/mass spectrometry with tetramethylammonium hydroxide (TMAH-py–GC/MS)

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