a further study on adsorption interaction of humic acid on

Adsorption Isotherms and Breakthrough Curves to Study How ...

May 13, 2009· Adsorption isotherms indicate the soil-added humic acid interaction, whereas breakthrough curves show that in the sorption process two different site types or two different mechanisms are involved. In the case of nickel, humic acid addition increases only the fraction strongly bound to the soil, whereas for cadmium both fractions increase.

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(PDF) Strong adsorption of DNA molecules on humic acids

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.

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Adsorption of sulfamethoxazole (SMZ) and ciprofloxacin ...

The adsorption behaviours and mechanisms of ciprofloxacin (CIP) and sulfamethoxazole (SMZ) as adsorptives on humic acid (HA) as adsorbents were studied. The adsorption isotherms of CIP and SMZ on HA fit the Freundlich equation better, and sorption equilibrium could be attained within 12 h.

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ADSORPTION OF SOIL-DERIVED HUMIC ACID BY SEVEN …

HA were found to have mutual effects on their adsorption to the acidic clay kaolinite. MATERIALS AND METHODS Humic acid Humic acid was extracted from the soil of a citrus orchard (Rhodoxeralf) (Basra, Israel) as described by Drori et al. (2008). The HA elemental composition was measured using a Flash EA 1112 CHNS-O elemental

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IJERPH | Free Full-Text | Effects of Humic Acid and ...

The interactions of DOC and SS during the removal of heavy metals by granular activated carbon were investigated in batch and fixed-bed column experiments. Batch adsorption studies indicated that Langmuir adsorption maxima for Pb, Cu, Zn, Cd, and Ni at pH 6.5 were 11.9, 11.8, 3.3, 2.0, and 1.8 mg/g, respectively.

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Effects of humic substances on the decomposition of 2,4 ...

The objectives of this study are to clarify the behavior of humic substances throughout the processes of 2,4-dichlorophenol (2,4-DCP) adsorption on granular activated carbon (GAC) from water and extraction into acetic acid, and the influence of the extracted humic substances on the decomposition of 2,4-DCP by ozone in the acetic acid. The adsorption capacity of GAC for 2,4-DCP was not influenced by the …

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Uranium Adsorption on Ferrihydrite - Effects of Phosphate ...

Humic acid Summary Uranium adsorption on ferrihydrite was studied as a function of pH in systems equilibrated with air, in the presence and absence of added phosphate and humic acid (HA).

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Adsorption of Humic Acid on Goethite: Isotherms, Charge ...

Dec 23, 2003· In this study, the adsorption of purified Aldrich humic acid (PAHA) on goethite was examined as a function of the environmental conditions (pH, salt concentration, and free concentration of PAHA) together with the proton adsorption to PAHA, goethite, and their mixtures.

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Adsorption of Humic Acid on Goethite: Isotherms, Charge ...

Dec 23, 2003· The adsorption of natural organic matter (NOM) on mineral (hydr)oxide plays an important role in the evaluation of the speciation of toxic metal ions in the environment. Because both NOM and mineral oxide have variable charges that adjust upon adsorption, a good understanding of proton binding is required before the binding of metal ions can be understood. In this study, the adsorption …

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Structural and sorption characteristics of adsorbed humic ...

This study examined the structural changes of humic acid (HA) after adsorption by clay minerals …. Clay-humic complexes are commonly distributed in natural environments. They play very important roles in regulating the transport and retention of hydrophobic organic contaminants in soils and sediments. This study examined the structural changes of humic acid (HA) after adsorption by clay minerals ….

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Adsorption of humic and fulvic acids onto a range of ...

Sep 15, 2020· Studies investigating the effect of adsorbed humic material on the adsorption of other aqueous species are also presented. The adsorbents used have been assessed in terms of their maximum HA or FA adsorption capacity with special emphasis given to environmental conditions such as contact time, solution pH, initial HA or FA concentration, temperature, and adsorbent dosage.

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Kinetic study of humic acid adsorption onto smectite: The ...

Dec 03, 2019· Therefore, kinetic study of humic acid (HA) adsorption onto smectite has been studied under various conditions. Impact of pH and individual and blend background electrolyte with different ionic strength concentration on the rate of adsorption has been investigated.

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Mechanism of adsorption of humic acid by modified aged ...

Oct 01, 2018· The adsorption process was facilitated by the continuous decrease in H + concentration, thus enhancing the activity of the base groups of AR; therefore, the adsorption effect of humic acid was strengthened. 39 However, when the pH increased above 8, the molecules in humic acid reacted with OH − to form ions, thus enhancing dissolution ...

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Study of Humic Acid Adsorption Character on Natural Maifan ...

Mar 30, 2020· ABSTRACT: In this paper, the adsorption of humic acid (HA) on natural maifan stone (MS) in aqueous medium was investigated. The changes in MS after adsorption have been characterized explicitly. The adsorption behavior was studied by varying …

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Effects of Adsorbed Humic Acid on Surface Charge and ...

Jan 01, 1997· The pH dependence (pH 3–11) of humic acid adsorption to kaolinite in a NaClO 4 background electrolyte was studied with batch experiments at three different ionic strengths (0.001, 0.01, and 0.1 M). Sorption of humic acid increased with decreasing pH or increasing ionic strength, a behavior that is typical for anionic polyelectrolytes with carboxylic functional groups.

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Study of Humic Acid Adsorption Character on Natural Maifan ...

In this paper, the adsorption of humic acid (HA) on natural maifan stone (MS) in aqueous medium was investigated. The changes in MS after adsorption have been characterized explicitly. The adsorption behavior was studied by varying the factors of pH (5–10), reaction time (10–180 min), initial HA concentration (5–50 mg/L), adsorbent dosage (0.1–1.2 g), and temperature (25–45 °C). The ...

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Equilibrium and kinetic studies on the adsorption of humic ...

This research is concerned with the adsorption of humic acid by activated sludge obtained from an alcoholic beverage plant and Bacillus subtilis (ATCC 6633). The effects of experimental factors such as initial pH, agitation speed, and types of

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A further study on adsorption interaction of humic acid on ...

In this study, a comparative study of adsorption characteristics of humic acid (HA) onto Ca-montmorillonite and Na-montmorillonite were carried out to guide the preparation of a novel composite ...

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(PDF) Copper adsorption on humic acid coated gibbsite ...

Copper adsorption on humic acid coated gibbsite: comparison with single sorbent systems. Environmental Chemistry, 2009. Sarah Fiol. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

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A further study on adsorption interaction of humic acid on ...

Feb 01, 2015· Several major mechanisms determining humic acid adsorption onto oxides may be accounted,, : (1) anion exchange (electrostatic interaction), (2) ligand exchange (surface complexation), (3) hydrophobic interaction, (4) entropic effect, (5) hydrogen bonding and (6) cation bridging.

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Adsorption of Humic Acid onto Carbonaceous Surfaces ...

Abstract. The adsorption of humic acid (HA) onto highly ordered pyrolytic graphite (HOPG) surfaces at different concentrations has been studied by atomic force microscopy. When HA concentration was increased from 10 to 1,000 mg/L, HA can sequentially form spherical particles, layered structures, and connected blocks on HOPG surfaces.

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Adsorption Interactions of Humic Acids with Biocides ...

Adsorption Interactions of Humic Acids with Biocides. ... At low concen-274 trations of most of the humic acid molecules located in the 275 surface layer. ... s-Triazine Adsorption Studies: Ca-H ...

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Adsorption of heavy metal ions onto insolubilized humic acid

May 01, 1995· @article{osti_63224, title = {Adsorption of heavy metal ions onto insolubilized humic acid}, author = {Seki, Hideshi and Suzuki, Akira}, abstractNote = {A fundamental study of the application of humic acid (HA) to the recovery of cadmium and lead from dilute solutions was carried out. HA, which has an excellent complexing ability with heavy metals, was insolubilized by heating at 330 C for 1 h ...

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[Forming mechanism of humic acid-kaolin complexes and the ...

The existence of interaction between humic acid and kaolin was indicated by the significant difference between the actual value and the theoretically overlaid value of the adsorption capacity. With various characterizations, such as FTIR and surface area & pore analysis, the mechanism of interaction between humic acid and kaolin was suggested as follows.

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Adsorption of nitrification inhibitor nitrapyrin by humic ...

In this study, the adsorption characteristics and mechanisms of nitrapyrin as an adsorptive on humic acid (HA) and fulvic acid (FA) as adsorbents were investigated. The results showed that the kinetics of adsorption of nitrapyrin on both HA and FA followed pseudo-second-order kinetic models (R2 $ 0.925, P < 0.05) and the adsorption process ...

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Effects of humic acid on enhanced removal of lead ions by ...

Nov 12, 2020· However, studies on the effects of humic acid are still rare and insufficient 33. ... which occurred along with the Pb 2+ reduction by nZVI and further improved the adsorption of HA.

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Effect of Humic Acid on As Redox Transformation and ...

(NOM) effects on As adsorption-desorption kinetics and speciation transformation. The experimental procedures were conducted by examining interactio ns of arsenate and arsenite with different concentrations of humic acid (HA) as a model representative of NOM, in the presence of iron oxide based adsorbent (IBA), as a model solid surface in three

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Study on the Modification of Humic Acid and Its Adsorption ...

Study on the Modification of Humic Acid and Its Adsorption to Methylene Blue Chen Rongping, Zhang Zishuai, Wu Ding gui ... adsorption is widely applied in further remediation of wastewater due to its high removal ... chemical adsorption involves stronger interactions and requires higher activation energy, ranging from 30 to 800 kJ/mol [12]. ...

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Adsorption of Humic Acid to Mineral Particles. 1. Specific ...

Apr 11, 1998· The adsorption of purified Aldrich humic acid onto hematite has been measured as a function of pH and salt concentration as well as in the presence of two cadmium concentrations. Besides the adsorbed amount, the thickness of the adsorbed layer has also been studied.

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(PDF) Adsorption of Humic Acid onto Nanoscale Zerovalent ...

Environ. Sci. Technol. 2007, 41, 2022-2027 Adsorption of Humic Acid onto waters can cause various environmental and health problems including the following: (1) they can cause undesirable color Nanoscale Zerovalent Iron and Its and taste, serving as food for bacterial growth in water distribution systems (3); (2) they can bind with heavy metals Effect on Arsenic Removal and biocides to yield ...

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Kinetic Study for Adsorption Humic Acid on Soil Minerals ...

The influence of ionic strength, pH, and solution cations on the rate of adsorption has been studied. The rate and the amount of adsorbed humic acid onto soil minerals increased with increasing ionic strength, decreasing pH, and in the presence of Ca2+ as background electrolyte.

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The effect of humic acid adsorption on pH-dependent ...

A further study on adsorption interaction of humic acid on natural magnetite, hematite and quartz in iron ore pelletizing process: Effect of the solution pH value Zhou Youlian, Yuanbo Zhang, G. Li, Wu Yudong, T. Jiang

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