Synthesis of lignin-base cationic flocculant and its application in removing anionic azo-dyes from simulated wastewater

Fang, Run; Cheng, Xin; Xu, Xiaorong

doi:10.1016/j.biortech.2010.04.094

Cited by 182 publications

(100 citation statements)

References 26 publications

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“…A number of methods to remove dyes from textile wastewater have recently been tested, such as sorption [1][2][3][4], flocculation [5], advanced oxidation processes [6][7][8][9] and electrocoagulation [10,11]. Among these processes, sorption is highly efficient and easy to implement [1,12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Scheufele

Ribeiro²,

Módenes³

et al. 2015

Fibers Polym

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We studied the effect of drying temperature of sugarcane bagasse (SB) on sorption of reactive blue 5G (RB5G) dye to test whether SB is a suitable biosorbent for industrial dye removal. First we assessed a set of SB characteristics that could influence the sorption capacity of dried biomass. Kinetic drying of the SB biomass was measured at different drying temperatures, ranging from 30 o C to 80 o C. We used a static gravimetric method to perform equilibrium moisture sorption experiments at drying temperatures of 35-65 o C. In addition, we measured activation energy and net isosteric heat of sorption. SB biomass was characterized as a heterogeneous low-porous and hygroscopic material, with a series of functional groups on its surface. A Lewis thin-layer model best represented the kinetic drying data. In addition, moisture diffusion into the SB biomass was characterized by a rate-controlling step in the drying process. Equilibrium moisture sorption data showed the expected effects of temperature controlling the sorption capacity and a multilayer sorption process. A sigmoidal sorption isotherm data was best represented by a BET model. A high energy demand is required for moisture removal from biomass as suggested by the measured isosteric heat of moisture sorption. Drying temperature did not influence the RB5G adsorption capacity of bagasse, therefore any drying temperature in the range of 30 o C to 80 o C could be used to make this material feasible as an industrial adsorbent.

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Section: Introductionmentioning

confidence: 99%

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Scheufele

Ribeiro²,

Módenes³

et al. 2015

Fibers Polym

View full text Add to dashboard Cite

show abstract

“…3 and 4). In comparison to traditional inorganic and some synthetic polymeric flocculants used to treat various reactive dyes from water reported in previous studies (Joo et al 2007;Yue et al 2008;Fang et al 2010), CMC-g-PDMC exhibited more effective in flocculation of not only anionic but also cationic dyes for its amphoteric characteristics. Furthermore, the dye removal efficiencies of chitosan, carboxymethyl chitosan, and carboxymethyl chitosan-graft-polyacrylamide have been also investigated in authors' previous work (Yang et al 2013).…”

Section: Process Optimizationmentioning

confidence: 67%

Modeling and optimization of the flocculation processes for removal of cationic and anionic dyes from water by an amphoteric grafting chitosan-based flocculant using response surface methodology

Yang

et al. 2015

Environ Sci Pollut Res

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In this study, an amphoteric grafting chitosan-based flocculant (carboxymethyl chitosan-graft-poly(2-methacryloyloxyethyl) trimethyl ammonium chloride, denoted as CMC-g-PDMC) was applied to removal of the anionic and cationic dyes, acid Green 25 (AG25) and Basic Bright Yellow (7GL), from water. Flocculation conditions have been optimized by response surface methodology (RSM) on the basis of central composite design (CCD) using flocculant dosage, initial solution pH and temperature as input variables. The second-order and cubic regression models, which have been both tested by the analysis of variance (ANOVA), were constructed to link the output response (the dye removal factor) with the aforementioned input variables, respectively. The second-order regression model well described the process of AG25 removal, whereas the cubic one is more suitable for that of 7GL. The effects of those variables on the flocculation performance of CMC-g-PDMC for removal of the two dyes containing opposite charges from aqueous solutions have been studied, and the flocculation mechanisms including the interactive effects between various influencing factors have been discussed in detail also.

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“…It is known that functional polymers serve a role as flocculants, [10] ion exchange resins [11] and ionic membranes [12] on the physical/chemical treatment process of hexavalent chromium, [11] ceric ion, [13] azo dyes, [14] nitrite, nitrate [15] and cobalt. [16] Meanwhile, functional polymers act as biocarriers and play an important role in biofilm processes, which is one of the important biological treatment technologies.…”

Section: Introductionmentioning

confidence: 99%

Preparation characteristics and accelerating denitrification effectiveness of polyamide 6 modified by AQS

Guo

Niu

et al. 2015

Biotechnology & Biotechnological Equipment

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In this study, the functional polymer biocarrier polyamide 6 (PA6) modified by anthraquinone-2-sulphonate (AQS) was synthesized by hydrolysis and sulphonation reactions. The optimal hydrolysis conditions of PA6 were 35 C, 3 mol/L HCl and 72 h reaction time. The optimal sulphonation conditions of PA6 modified by AQS (PA6-AQS) were 30 C and 6 h reaction time. The morphology and heat resistance of PA6-AQS were analysed by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry. The AQS content of PA6-AQS, determined by an elemental analysis, was approximately 0.11 mmol/g. The denitrification efficiency was enhanced by 1.78-fold with PA6-AQS. Repeated-batch operations showed that the denitrification efficiency with PA6-AQS became stabilized above 80% of the original value and exhibited a better catalytic activity and durability.

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Synthesis of lignin-base cationic flocculant and its application in removing anionic azo-dyes from simulated wastewater

Cited by 182 publications

References 26 publications

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Assessment of drying temperature of sugarcane bagasse on sorption of reactive blue 5G dye

Modeling and optimization of the flocculation processes for removal of cationic and anionic dyes from water by an amphoteric grafting chitosan-based flocculant using response surface methodology

Preparation characteristics and accelerating denitrification effectiveness of polyamide 6 modified by AQS

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