In this study, the performance of N-methyl-D-glucamine (NMDG) type functional group attached a novel boron selective chelating fiber adsorbent, Chelest Fiber GRY-HW, was investigated for boron removal from geothermal brine containing 10-11 mg B/L through a packed bed column. The effect of feed flow rate (Space Velocity, SV) on breakthrough capacity of Chelest Fiber GRY-HW was studied using various SV values (15, 20 and 30 h −1 ). The effect of SV on breakthrough capacity was particularly apparent when SV was decreased from 30 to 15 h −1 . Yoon-Nelson, Thomas and Modified Dose Response (MDR) models were applied to the experimental data to estimate the breakthrough curves and model parameters such as rate constants and breakthrough times. The obtained results showed that the breakthrough curves were better described by Modified Dose Response (MDR) model than those described by Yoon-Nelson and Thomas models in each case. Also, the model estimations for adsorption capacity obtained by MDR model agreed well with the experimental results.
Floating photocatalytic composite particles were created by injecting a lipid (sunflower oil or liquefied cocoa butter) into an aqueous suspension of TiO 2 nanoparticles using the process of membrane emulsification to control the (Pickering) emulsion size. The composite particle median diameters were controlled in a range from 80 to 300 µm. The composite particles floated in water and possessed photocatalytic activity, which was further enhanced by chemically incorporating silver particles into the TiO 2 shell. The cocoa butter-based composite particles proved more robust, and were not affected by the UV photocatalytic process. Using a combination of cocoa butter and hexane, for the core of the particles, it was possible to generate composite TiO 2 and lipid particles with 36 mg TiO 2 per gram of particle. Optimal dye decolourization was achieved with a particle surface coverage of between 60 and 80%. Complete surface coverage resulted in a reduced reaction rate due possibly to reflection of the UV light.2
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