Optimization of the synthesis of a new coagulant from a tannin extract

Beltrán‐Heredia, J.; Sánchez‐Martín, Jesús; Dávila-Acedo, María Antonia

doi:10.1016/j.jhazmat.2010.12.075

Cited by 80 publications

(33 citation statements)

References 36 publications

(40 reference statements)

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“…Conclusively, high removal efficiency at low pH values are predominant in organic contaminants removal from acid dyes. Similar results were reported by [33][34].…”

Section: Response Surface Plotting For Evaluation Of Operational Parasupporting

confidence: 91%

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Obiora-Okafo¹,

Onukwuli²

2017

Nig. J. Tech.

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The ability of organic polymer rich coagulants for colour removal from acid dye was studied. An improved method for the extraction of the active coagulant agent from the seeds was employed. The effects of four variables including pH, coagulant dosage, dye concentration and time were analyzed. Response surface methodology (RSM) using face-centered central composite design (FCCD) was used to optimize the four variables. Increase in the colour removal efficiency was higher in acidic solution pH. Accurate control of coagulant dosages gave optimum destabilization of charged particles and re-stabilization occurred at above 800mg/L dosages. Polymer performances were measured through time-dependent decrease in particle concentrations following aggregates growth. The verification experiment agreed with the predicted values having less than 4% standard error. Overlay contour plot was used to establish an optimum condition for the multiple responses studied. The response surface approach was appropriate for optimizing the coagulation-flocculation process while minimizing the number of experiments. Coagulants studied should be considered as an alternative for conventional coagulants that are widely used in dye wastewater treatment plants.

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“…Conclusively, high removal efficiency at low pH values are predominant in organic contaminants removal from acid dyes. Similar results were reported by [33][34].…”

Section: Response Surface Plotting For Evaluation Of Operational Parasupporting

confidence: 91%

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Obiora-Okafo¹,

Onukwuli²

2017

Nig. J. Tech.

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“…These are obtained from the chemical reaction that grants the cationic character for the organic matrix material. Thus new features are added, such as the coagulation activity, since positively charged products can destabilize anionic colloids when mixed in aqueous solution [31]. The oilseed crop produces lignocellulosic biomass that is generally underutilized, consisting mainly of cellulose, hemicellulose, and lignin.…”

Section: Introductionmentioning

confidence: 99%

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Ribeiro¹,

Filho²,

Rozeno³

et al. 2017

Express Polym. Lett.

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Abstract. Biodiesel wastewater generally contains high levels of oils, soaps and glycerol residues. This needs wastewater treatment. In this study, the biodiesel wastewater treatment was tested (industrial wastewater (EFID) and laboratory wastewater (EFLB) from biodiesel) by performing flocculation and dual-flocculation with renewable polymers. Tannin and cationic hemicellulose (CH) were used as cationic flocculant, and cellulose acetate sulfate (CAS) was used as an anionic flocculant. Polyacrylamide (PAM) was used as a reference anionic flocculant for result efficiencies analysis obtained with CAS (renewable source flocculant). The treatment efficacy in wastewater was evaluated by: turbidity removal, sludge volume formed, chemical oxygen demand (COD) and total suspended solids (TSS). The obtained sludge was studied using thermogravimetric analysis (TG). The dual-flocculation application condition of the 25% proportion of tannin (T) and 75% proportion of cationic hemicelluloses (i.e., T25/CH75) showed EFLB turbidity removal of 89.1% and 89.5% for CAS and PAM additions respectively, and for EFID of 67% and 41% for CAS and PAM additions respectively. The dual-flocculation performance suggested that the polyelectrolytes obtained from renewable sources can be used for treating biodiesel wastewater.

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“…DOE is considered one of the most important methodologies for researchers handling experiments in practical applications [24][25][26] because it provides an organized approach, with which it is possible to address both simple and tricky experimental problems. Thus, by means of DOE, one obtains more useful and more precise information about the studied system, because the joint influence of factors is assessed, which …”

Section: Design Of Experimentsmentioning

confidence: 99%

Experimental investigation on the concentration and voltage effects on the characteristics of deposited magnesium–lanthanum powder

et al. 2015

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Phone: +33 248 484 065 HighlightsWe synthetize Mg-La powders by means of an electrodeposition process.We characterize Mg-La powders using EDS, SEM, XRD and FTIR techniques. EDS analyses indicate the presence of three elements (Mg, La and O).The two phases, Mg(OH) 2 and La(OH) 3 are identified in specimens.Concentration and voltage effects are investigated using a design of experiments. AbstractIn this paper, magnesium-lanthanum powders were synthesized by an electrodeposition technique using an aqueous solution, based on magnesium chloride hexahydrate and showed the existence of two distinct phases in the obtained deposits which are magnesium hydroxide (Mg(OH) 2 ) and lanthanum hydroxide (La(OH) 3 ). FTIR analyses confirm the presence of the two phases identified in XRD diffractograms and they can be exhibited by clear peaks. In the studied ranges of voltage and La weight percentage, their peak transmittances have non-monotonic behaviors. A design of experiments was used to determine the influence of these two processing parameters and their interaction on the products formation. The parameters effects were ranked as follow: the first was the voltage then the interaction between the two parameters and finally the La content.

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Optimization of the synthesis of a new coagulant from a tannin extract

Cited by 80 publications

References 36 publications

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Optimization of coagulation-flocculation process for colour removal from Azo dye using natural polymers: response surface methodological approach

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Experimental investigation on the concentration and voltage effects on the characteristics of deposited magnesium–lanthanum powder

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