Fe-loaded zeolites as catalysts in the formation of humic substance-like darkcoloured polymers in polycondensation reactions of humic precursors

Fukuchi, Shigeki; Fukushima, Masami; Nishimoto, Ryo; Qi, Guangxia; Satō, Tsutomu

doi:10.1180/claymin.2012.047.3.06

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…Manganese oxides typically exhibit highly enhancing performance in humification, which can stimulate combination of phenolic carbon to humic-like substances (HLS) [11][12][13][14][15][16]. Moreover, Fe-loaded zeolites as catalysts can also promote humification, and the yield of HLS increases with the addition of Fe into zeolite [17].…”

Section: Introductionmentioning

confidence: 98%

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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Section: Introductionmentioning

confidence: 98%

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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“…HAs, apart from natural sources, can also be synthetized through abiotic humification. This process is based on transformations of humic precursors (e.g., amino acids, sugars, and quinones) to HS in the presence of a metallic oxide (e.g., MnO 2 , Fe 2 O 3 , Al 2 O 3 ), which catalyzes and enhances these transformations [ 70 ]. Yang and Hodson [ 71 ] found that SHLA prepared via abiotic humification, using catechol and glycine as humic precursors and an MnO 2 catalyst, was characterized with higher Cu complexation ability than commercial HA (CHA).…”

Section: Novel Was and Their Applicability For Hms Removal From Somentioning

confidence: 99%

New-Generation Washing Agents in Remediation of Metal-Polluted Soils and Methods for Washing Effluent Treatment: A Review

Gusiatin

Kulikowska

Klik

2020

IJERPH

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Soil quality is seriously reduced due to chemical pollution, including heavy metal (HM) pollution. To meet quality standards, polluted soils must be remediated. Soil washing/soil flushing offers efficient removal of heavy metals and decreases environmental risk in polluted areas. These goals can be obtained by using proper washing agents to remove HMs from soil. These washing agents should not pose unacceptable threats to humans and ecosystems, including soil composition. Currently, it is desirable to use more environmentally and economically attractive washing agents instead of synthetic, environmentally problematic chemicals (e.g., ethylenediaminetetraacetic acid (EDTA)). The usefulness of novel washing agents for treatment of heavy metal-contaminated soils is being intensively developed, in terms of the efficiency of HM removal and properties of washed soils. Despite the unquestionable effectiveness of soil washing/flushing, it should be remembered that both methods generate secondary fluid waste (spent washing solution), and the final stage of the process should be treatment of the contaminated spent washing solution. This paper reviews information on soil contamination with heavy metals. This review examines the principles and status of soil washing and soil flushing. The novel contribution of this review is a presentation of the sources and characteristics of novel washing agents and chemical substitutes for EDTA, with their potential for heavy metal removal. Methods for treating spent washing solution are discussed separately.

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The copper complexation ability of a synthetic humic-like acid formed by an abiotic humification process and the effect of experimental factors on its copper complexation ability

Yang

Hodson

2018

Environ Sci Pollut Res

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Humic acids have an important impact on the distribution, toxicity, and bioavailability of hazardous metals in the environment. In this study, a synthetic humic-like acid (SHLA) was prepared by an abiotic humification process using catechol and glycine as humic precursors and a MnO catalyst. The effect of physico-chemical conditions (ionic strength from 0.01 to 0.5 M NaNO, pH from 4 to 8, temperature from 25 to 45 °C, and humic acid concentration from 5 to 100 mg/L) on the complexation ability of SHLA for Cu were investigated. A commercial humic acid (CHA, CAS: 1415-93-6) from Sigma-Aldrich was also studied for comparison. The results showed that for pH 4 to 8, the conditional stability constants (log K) of SHLA and CHA were in the range 5.63-8.62 and 4.87-6.23, respectively, and complexation capacities (CC) were 1.34-2.61 and 1.42-2.31 mmol/g, respectively. The Cu complexation ability of SHLA was higher than that of the CHA due to its higher number of acidic functional groups (SHLA 19.19 mmol/g; CHA 3.87 mmol/g), extent of humification and aromaticity (AL/AR: 0.333 (SHLA); 1.554 (CHA)), and O-alkyl functional groups (SHLA 15.56%; CHA 3.45%). The log K and complexation efficiency (fraction of metal bound to SHLA) of SHLA were higher at higher pH, lower ionic strength, higher temperature, and higher SHLA concentration. Overall, SHLA was a good and promising complexation agent for copper in both soil washing of copper contaminated soil and the treatment of copper-containing wastewater.

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Fe-loaded zeolites as catalysts in the formation of humic substance-like darkcoloured polymers in polycondensation reactions of humic precursors

Cited by 10 publications

References 37 publications

Role of ferric oxide in abiotic humification enhancement of organic matter

Role of ferric oxide in abiotic humification enhancement of organic matter

New-Generation Washing Agents in Remediation of Metal-Polluted Soils and Methods for Washing Effluent Treatment: A Review

The copper complexation ability of a synthetic humic-like acid formed by an abiotic humification process and the effect of experimental factors on its copper complexation ability

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