Chitosan hydrogel beads for fulvic acid adsorption: Behaviors and mechanisms

Wang, Shuguang; Sun, Xiaohua; Liu, Xianwei; Gong, Wen-Xin; Gao, Baoyu; Bao, Nan

doi:10.1016/j.cej.2007.11.025

Cited by 74 publications

(28 citation statements)

References 44 publications

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“…The pH of the solution at which pH i − pH f is zero is termed as pH PZC at point of zero charge. Thus, the hydrogel will remain neutral when solution pH equals pH PZC , positively charged when solution pH is less than pH PZC or negatively charged at pH N pH PZ [10]. From Fig.…”

Section: Point Of Zero Charge (Pzc) Phmentioning

confidence: 92%

Swelling, diffusion, network parameters and adsorption properties of IPN hydrogel of chitosan and acrylic copolymer

Mandal¹,

Ray

2014

Materials Science and Engineering: C

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Section: Point Of Zero Charge (Pzc) Phmentioning

confidence: 92%

Swelling, diffusion, network parameters and adsorption properties of IPN hydrogel of chitosan and acrylic copolymer

Mandal¹,

Ray

2014

Materials Science and Engineering: C

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“…Humic acid imparts a brown or yellow color in peat water and pose a serious environmental problem, particularly in drinking water treatment because of their taste and odor. They also tend to react with a variety of oxidants and disinfectants used for the purification of drinking water forming carcinogenic disinfection byproducts (DBPs) such as trihalomethanes and haloacetic acids (Daifullah et al 2004;Kamari et al 2009;Ngah et al 2011;Uygunera et al 2007;Sonea et al 2010;Tao et al 2010;Wang et al 2008a;Wang et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a need to continue the search and developing alternative adsorbents with high adsorptive capacity and low cost for humic acid removal. As a consequence, numerous low cost materials such as rice husk activated carbon (Daifullah et al 2004), Shorea dasyphylla sawdust (Kamari et al 2009), chitosan (Wang et al 2008a), fly ash (Wang et al 2008b), and other adsorbents (Ngah et al 2011;Sonea et al 2010;Tao et al 2010;Wang et al 2011;García et al 1998;Zhang and Bai 2003;Ngah et al 2008) were used for removal of humic acid. In the present work, the possibility of powdered eggshell to be used as an adsorbent material for removal of humic acid from peat water has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Removal of humic acid from peat water using untreated powdered eggshell as a low cost adsorbent

Zulfikar

Novita²,

Hertadi

et al. 2013

Int. J. Environ. Sci. Technol.

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The main objective of this study is to investigate the possibility of powdered eggshell used as an adsorbent material for removal of humic acid from peat water. The influences of contact time, dose of eggshells, pH, and temperature were the factors considered in the removal processes of humic acid from peat water. In addition, adsorption isotherms of humic acid onto the powdered eggshell were also evaluated with the Langmuir and Freundlich approximations. Our results showed that the equilibrium of the process was eventually established after 60 min of the contact time, and also found that using 5 g of the powdered eggshell nearly 95 % of humic acid has been successfully removed from the peat water. The removal of humic acid gave better result when it was conducted at low pH, and it was almost unaffected the temperatures variation. The data was well fitted to Freundlich isotherm with the correlation coefficient of not \0.999, and could uptake the humic acid about 126.58 mg/g at pH 4.01, estimated from the Langmuir model. The kinetic experimental data proportionally correlated with the pseudo-second-order kinetic model with a rate constant in the range of 0.016-0.112 g mg -1 min -1 , while intra-particle-diffusion were the main rate determining step in the humic acid removal process. The powdered eggshell investigated in this study, thus, exhibited as a high potential adsorbent for the removal of humic acid from peat water.

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“…The physicochemical BC characteristics were analyzed according to ASTM [20]. The pH pzc (pH of point of zero charge) for BC was determined according to the method described previously in the literature [21].The concentrations of total acidic (NaOH uptake) and basic groups on carbon surfaces were determined by the Boehm method (alkali metric titration) [22].…”

Section: Methodsmentioning

confidence: 99%

Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

Mortazavi

Asgari

Hashemian

et al. 2010

Reac Kinet Mech Cat

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Catalytic ozonation has recently been used as a new means of contaminant removal from water and wastewater. In this study, bone charcoal (BC), a new catalyst prepared under laboratory conditions, was used to catalyze the ozonation of humic substances (HS) in aqueous solutions. The catalytic effect of bone charcoal and the relevant parameters of this ozonation process (solution pH, temperature, scavenger effect, humic acids concentration and BC dosage) were investigated. In the catalytic ozonation experiments, the degradation kinetics was investigated. The reaction rate and the rate constant were determined. The results showed that using a BC catalyst in the ozonation of HS produced a 1.43-and 1.56-fold increase in reaction rates compared to the sole ozonation processes (SOP) under acidic and alkaline conditions, respectively. Furthermore, the applicability of heterogeneous catalytic ozonation with bone charcoal (HCOBC) to humic acid degradation was evaluated by performing comparisons with H 2 O 2 , O 3 , O 3 /H 2 O 2 and O 3 /H 2 O 2 /BC processes. With the use of the Arrhenius equation, the activation energy (E a ) was calculated to be 10 kJ mol -1 . The results also showed that under the different temperatures, the reaction of the catalytic ozonation of HS was defined as diffusion controlled in accordance with the activation energy. These findings suggest that the HCOBC can be applied as an efficient and feasible method for the removal of HS from water.

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Chitosan hydrogel beads for fulvic acid adsorption: Behaviors and mechanisms

Cited by 74 publications

References 44 publications

Swelling, diffusion, network parameters and adsorption properties of IPN hydrogel of chitosan and acrylic copolymer

Swelling, diffusion, network parameters and adsorption properties of IPN hydrogel of chitosan and acrylic copolymer

Removal of humic acid from peat water using untreated powdered eggshell as a low cost adsorbent

Degradation of humic acids through heterogeneous catalytic ozonation with bone charcoal

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