Influence of chemical compositions and molecular weights of humic acids on Cr(VI) photo-reduction

Chen, S.Y.; Huang, Song-Hui; Chiang, Po‐Neng; Liu, J.C.; Kuan, Wen-Hui; Huang, Jui-Yuan; Hung, J. T.; Tzou, Yu-Min; Chen, C.C.; Wang, M.K.

doi:10.1016/j.jhazmat.2011.09.091

Cited by 57 publications

(14 citation statements)

References 35 publications

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“…Moreover, these results indicate that the HA of CM+FRW was poorer in functional groups (carboxylic or phenolic), suggesting that the humic acids of the other treatments have greater potential to generate soil OM exchange sites (Dick et al, 2003), contributing to improve soil chemical agronomical properties, an effect particularly important in low-OM content soils, as in the case of this study. In this sense, the HA of SM showed the lowest H/C and highest O/C atomic ratios, as well as the highest polarity index (0.83) ( Table 5) in comparison to the rest of the treatments, indicating the presence of aromatic domains with polar functional groups in the HA of SM (Chen et al, 2011;Moraes et al, 2011). Similar behavior was verified for PS.…”

Section: Elemental Composition and Ftir Analysis Of Humic And Fulvic supporting

confidence: 60%

Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues

Antunes

Leal

Castilhos

et al. 2019

Rev. Bras. Ciênc. Solo

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Vermicomposted vegetal and animal residues are rich in nutrients and humic substances and thus can be applied to the soil as a source of functionalized organic matter (OM) and as an alternative to chemical fertilizers. In Southern Brazil, many animal and vegetal residues are easily accessible. Therefore, this study aimed to evaluate alterations in soil chemical properties and OM chemical composition in response to the application of local vermicomposted residues. The vermicomposts of: cattle manure (CM), sheep manure (SM), rice parboiling sludge (PS), CM+PS; SM+PS; CM+food waste (FW); SM+FW; CM+fruit waste (FRW); and SM+FRW were mixed with Acrisol (Argissolo) samples collected at 0.00-0.20 m layer, and the samples were incubated in plastic bags for 182 days. Soil samples without vermicomposts were also incubated (control). Overall, vermicomposts increased soil pH(H 2 O), exchangeable Ca and available P and K contents. The treatments with CM or SM with FW promoted carbon accumulation in the soil compared to the control, especially as humin. The humic acids of SM and PS were more oxygenated than the others, and oxygenation was apparently associated with aromatic structures. Fulvic acids of CM+PS showed the greatest oxygenation and aliphatic character. The relationship between vermicompost origin (animal or vegetal) and soil properties or OM composition was not clear. Aromaticity degree (H/C) and C/N ratio were similar in fulvic and humic acids, and oxygenation degree (O/C) as well as polarity index [(O+N)/C] were more efficient parameters to distinguish these humic fractions. We concluded that vermicomposts derived from cheap and easily available vegetal and animal residues in Southern Brazil have great potential as alternative fertilizers as well as sources of functionalized OM when applied to the soil, especially vermicomposts of rice parboiling sludge and cattle or sheep manure mixed with food waste.

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Section: Elemental Composition and Ftir Analysis Of Humic And Fulvic supporting

confidence: 60%

Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues

Antunes

Leal

Castilhos

et al. 2019

Rev. Bras. Ciênc. Solo

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“…HA's are complex aggregates of dark-colored amorphous high molecular weight substances extracted from the natural degradation products of plant and animal residues [7,8]. Although considerable work about HA exists, some of them have dealt with HA adsorption on clay minerals, that's because HA solubility increases with increasing pH [9,10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Humic Acid onto Jordanian Kaolinite Clay: Effects of Humic Acid Concentration, pH, and Temperature

Al-Essa¹

2018

SJC

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Kaolinite clay has low cation exchange capacity and small surface area; it has rarely been used as adsorbent. As well as, green, low cost and efficient adsorbent is desired. Modification of kaolinite is necessary to improve its adsorption capacity. Jordanian kaolinite has been modified by humic acid (HA) through batch adsorption mode. Two types of HA were used; one was commercial (FHA) and the other was natural (KTD). The effect of HA concentration, pH and temperature of solution were considered. HA adsorption becomes higher at low concentration, decreases with increasing pH, and it increased with solution temperature. Modified Jordanian kaolinite clay was characterized by different techniques: FTIR, TGA, SEM connected to EDS and porosimetry analysis by Gas Adsorption Isotherm and Mercury Porosimetry. The modified kaolinite showed good and strong interaction with HA, enhancement in its surface and charge structure, and increasing in the average pore radius. Therefore, increases in its reactivity and adsorption sites especially towards heavy metal ions. Moreover, FHAkaolinite clay showed better adsorption characteristics than KTD-kaolinite clay.

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“…NOM is widely found in natural waters and soils, and typically is represented by humus. Humus is an amorphous brown‐colored polymer, which can be subdivided according to its solubility in strong acid and base: HA (insoluble in acid), fulvic acid (soluble in both acid and base), and humin (insoluble in both acid and base) . In the present study, we took two kinds of NOM: HA and TA to explore their impacts on Cr(VI) removal.…”

Section: Resultsmentioning

confidence: 99%

Influence of Environmental Factors on Hexavalent Chromium Removal From Aqueous Solutions by Nano‐Adsorbent Composites

Xue

Jiang

et al. 2015

CLEAN Soil Air Water

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This study investigates the removal of Cr(VI) by nanoscale zero‐valent iron (nZVI)‐multiwalled carbon nanotubes (MWCNTs) composites from aqueous solutions. Various influential environmental factors including temperature, pH, co‐existing ions, and natural organic matters (NOM) on Cr(VI) removal were evaluated. Results revealed that temperature variations significantly influenced Cr(VI) removal and the efficiency decreased to 22% with increasing in temperature from 10 to 40°C. Cr(VI) removal efficiency decreased with increasing pH and the final pH increased to 9.1, 10.1, and 10.2 from 5, 7, and 9, respectively, after 2 h of the reaction. Interestingly, most of the co‐existing ions except copper presented comparatively lower final removal rates. However, co‐existing ions including Pd2+, Ca2+, Zn2+, and Mg2+ facilitated higher Cr(VI) removal. Copper was observed to greatly promote the reaction and 99.5% removal efficiency was achieved within 30 min after adding 20 mg L−1 of Cu2+. In contrast, Cr(VI) removal efficiency drastically dropped to 58.9% from 97.9% in the presence of As(V). At higher concentrations of humic and tannic acid; the two representatives of NOM were observed to exhibit a negative impact on Cr(VI) removal. The changes appeared on nZVI‐MWCNTs before and after the reaction with Cr(VI) were investigated by transmission electron microscopy. The reusability of nZVI‐MWCNTs showed a recovery rate of 53.4% in the third round and demonstrated a better utility of nZVI‐MWCNTs composites in wastewater treatment applications.

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Influence of chemical compositions and molecular weights of humic acids on Cr(VI) photo-reduction

Cited by 57 publications

References 35 publications

Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues

Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues

Adsorption of Humic Acid onto Jordanian Kaolinite Clay: Effects of Humic Acid Concentration, pH, and Temperature

Influence of Environmental Factors on Hexavalent Chromium Removal From Aqueous Solutions by Nano‐Adsorbent Composites

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