Adsorbability and photocatalytic degradability of humic substances in water on Ti-modified silica

Moriguchi, Takeshi; Tahara, Muneaki; Yaguchi, Kazuhiko

doi:10.1016/j.jcis.2005.11.002

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…The carbon and nitrogen content in this sample were found to be 49.2 and 3.5%, respectively. Properties of Wako humic acid and Sigma-Aldrich humic acid have been described in other studies (Janoš and Zatřepálková 2007;Moriguchi et al 2006;Saeki and Kunito 2009). The carbon and nitrogen content were 50.7 and 1.2% in the Sigma-Aldrich humic acid (Janoš and Zatřepálková 2007), and 57.1 and 1.1% in the Wako humic acid (Saeki and Kunito 2009).…”

Section: Humic Acidsmentioning

confidence: 60%

Strong adsorption of DNA molecules on humic acids

et al. 2011

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Analysing soil microbial communities is often hampered by DNA adsorption on soil organic compounds such as humic acids. However the role of humic acids in DNA adsorption and stability in soils remains controversial. To characterize DNA-humic acid interactions, we studied DNA adsorption on two commercially available humic acids and a soil humic acid extracted from an Andosol. Desorption of the adsorbed DNA using 4 different solutions-distilled water, 0.1 M NaCl, 0.1 M sodium phosphate buffer (pH 6.0), and 1% sodium dodecyl sulfate solution-was also studied to understand the mechanism of DNA adsorption on humic acids. Here, we show that humic acids play an important role in DNA adsorption to soils. DNA molecules were adsorbed on the humic acids, with adsorption increasing proportionally with the DNA concentrations in the solution. The adsorption on all humic acid samples was fitted with Freundlich equation, and the parameters obtained from the equation indicated a high affinity between the humic acids and DNA molecules. The total amount of DNA desorbed by the 4 solutions was less than 2% of the total DNA adsorbed on all the humic acids. The results demonstrate that DNA molecules are able to bind strongly to humic acids by ligand binding, hydrophobic interaction, aggregation, or precipitation.

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Section: Humic Acidsmentioning

confidence: 60%

Strong adsorption of DNA molecules on humic acids

et al. 2011

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“…The material properties, elemental analysis, predictive molecular weight (Mw), and functional group contents (COOH, Ar-OH), were revealed in TABLE 1. 15 Hydroxyapatites, HAP-300 and HAP-400, which were synthesized from CaHPO 4 ·2H 2 O and CaCO 3 (Ca/P = 1.68, stoichiometric; containing 2.5 wt% CO 3 .) and from CaHPO 4 ·2H 2 O and NaOH (Ca/P = 1.38, calcium-deficient), 16,17 respectively, were supplied from Taihei Chemical Industrial Co., Ltd. Iron (III) chloride hexahydrate FeCl 3 ·6H 2 O (purity 99.9%), lead (II) nitrate Pb(NO 3 ) 2 (purity 99.9%), and distilled water (H 2 O) were purchased from Wako Pure Chemical Industries, Ltd., Osaka, Japan.…”

Section: Methodsmentioning

confidence: 99%

“…The enhancement of adsorption rates is possibly due to difference in complex stability between humic substance and surface metal site. Some studies on complex stability between humic acid and free metal ions at pH 5, of which value is near the pH values of the present humic substances in water (NHA, pH 5.51; NFA, pH 5.32; SFA, pH 5.02), 15 were reported as stability constants (log K) as follows. 22 to give firm metal-organics complexes, namely the inner-sphere complexes.…”

Section: Adsorbability Of Humic Substancesmentioning

confidence: 99%

ADSORBABILITY AND PHOTO-FENTON REACTIVITY OF AQUATIC HUMIC SUBSTANCES WITH Fe(III)-TREATED HYDROXYAPATITES IN WATER

Moriguchi

Nakagawa

2014

Phosphorus Research Bulletin

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Fe(III)-treated hydroxyapatite, HAP-300-Fe or HAP-400-Fe, which was prepared by treatment of almost stoichiometric hydroxyapatite HAP-300 or Ca-deficient hydroxyapatite HAP-400 with Fe(III) aqueous solution, was investigated in adsorption of aquatic humic substances, Nordic aquatic humic acid (NHA), Nordic aquatic fulvic acid (NFA), and Suwannee river fulvic acid (SFA), at 25˚C for 6 h. HAP-400-Fe indicated higher adsorbability than HAP-300-Fe or the raw hydroxyapatite HAP-400. Further, HAP-400-Fe was investigated as a heterogeneous catalyst in photo-Fenton reaction of NHA, NFA, and SFA at 25˚C for 20 h in water. Although all the humic substances were subjected to oxidation or decolorization by catalysis of HAP-400-Fe, the humic substance molecules adsorbed on HAP-400-Fe were slightly degraded and mineralized. This is possibly due to steric hindrance of catalysis by those large adsorbed molecules themselves and/or due to a property to scavenge hydroxyl radicals by Ar-OH groups of those molecules.

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“…The adsorptive characteristics of humic acid onto different solid interfaces had been well studied [1,2,4,5]. Generally, previous studies mainly focused on the adsorptive behaviors of special humic acid molecules onto a solid phase.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive behaviors of humic acid onto freshly prepared hydrous manganese dioxides

Liu

Yang

et al. 2007

Front.Environ.Sci.Eng.China

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This study focused on the adsorptive behaviors of humic acid onto freshly prepared hydrous MnO 2 (s) (δMnO 2 ), and investigated the feasibility of employing δMnO 2 for humic acid removal from drinking water. Effects of such parameters as molecular mass of humic acid, kinds of divalent cations on adsorptive behaviors and possible mechanisms involved were investigated. This study indicated that humic acid with higher molecular mass exhibited more tendency of adsorbing onto δMnO 2 than that with lower molecular mass. Ca 2+ facilitated more humic acid adsorption than Mg 2+ ; UV-Vis spectra analysis indicated higher capabilities of Ca 2+ coordinating with acidic functional groups of humic acid than that of Mg 2+ . Additionally, ζ potential characterization indicated that Ca 2+ showed higher potential of increasing ζ potential of δMnO 2 than Mg 2+ . Ca 2+ of 1.0 mmol/L increased ζ potential of δMnO 2 from −37 mV (pH 7.9) to +7 mV (pH 7.2), while 1.0 mmol/L Mg 2+ increased to lower value as −9 mV (pH 6.5), correspondingly. Fourier transform infrared (FTIR) spectra demonstrated the adsorption of humic acid onto δMnO 2 , showing the important roles of -COO − functional groups and surface Mn-OH in the adsorption of humic acid onto δMnO 2 .

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Adsorbability and photocatalytic degradability of humic substances in water on Ti-modified silica

Cited by 17 publications

References 20 publications

Strong adsorption of DNA molecules on humic acids

Strong adsorption of DNA molecules on humic acids

ADSORBABILITY AND PHOTO-FENTON REACTIVITY OF AQUATIC HUMIC SUBSTANCES WITH Fe(III)-TREATED HYDROXYAPATITES IN WATER

Adsorptive behaviors of humic acid onto freshly prepared hydrous manganese dioxides

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