JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Experimental design methodology applied to boron removal from brine by adsorption onto in-situ precipitated magnesium hydroxide

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The objective of the present study is to investigate the elimination of boron from brine (saline water), by adsorption using Mg(OH)2 precipitate in-situ as adsorbent. To optimize the experimental condition of boron removal and to evaluate statistically the important significant factors, an experimental methodology design was implemented using 23 full factorial design. The selected parameters were temperature (25°C and 70°C), molar ratio (10 and 30), stirring speed (200 and 600 rpm) and reaction time (15 min and 60 min), while Y1 (the % of boron removal) and Y2(the % of magnesium precipitate) are chosen as the responses variables. The results were analyzed statistically using the analysis of variance, F-test and the student’s t-test to check the significance of the variables effects. The model function equation for boron removal and magnesium precipitate was obtained. The obtained results showed that temperature, molar ratio, stirring speed and time affected boron removal. The optimum operating conditions were found as temperature: 25 °C, molar ratio Mg/B: 30, stirring speed: 600 rpm and time: 15 min. These optimum experimental conditions were used to eliminate 92% of boron initially present in brine in the form of Mg2B2O5.

A. Boughalmi, H. Hammi, A. M’nif

Adsorption; Boron removal, Experimental Design, Full Factorial Design, Hydroxide magnesium

Pages: 276-287

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