Norela Jusoh

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

In this work, mesostructured silica nanoparticles (MSN(AP)) with high adsorptivity were prepared by a modification with 3-aminopropyl triethoxysilane (APTES) as a pore expander. The performance of the MSN(AP) was tested by the adsorption of MB in a batch system under varying pH (2-11), adsorbent dosage (0.1-0.5 g L(-1)), and initial MB concentration (5-60 mg L(-1)). The best conditions were achieved at pH 7 when using 0.1 g L(-1) MSN(AP) and 60 mg L(-1)MB to give a maximum monolayer adsorption capacity of 500.1 mg g(-1) at 303 K. The equilibrium data were evaluated using the Langmuir, Freundlich, Temkin, and Harkins-Jura isotherms and fit well to the Freundlich isotherm model. The adsorption kinetics was best described by the pseudo-second order model. The results indicate the potential for a new use of mesostructured materials as an effective adsorbent for MB.

Simultaneous extraction and enrichment of reactive dye using green emulsion liquid membrane system

ABSTRACT Currently, an extractive green palm oil-based emulsion liquid membrane (ELM) has been used for simultaneous extraction and enrichment of Reactive Red 3BS from simulated synthetic dye wastewater. The ELM consists of two main phases, which are organic liquid membrane (LM) and stripping solution. During the extraction process, the ELM was dispersed into the simulated synthetic dye wastewater containing the Reactive Red 3BS complexes. The organic LM contains tridodecylamine (TDA), Sorbitan Monooleate (Span 80) and palm oil as a carrier, surfactant and diluent, respectively. The sodium bicarbonate (NaHCO3) was used as stripping solution for the enrichment process. Several important parameters that affected the simultaneous extraction and enrichment of Reactive Red 3BS, such as carrier and stripping agent concentrations, extraction time and treat ratio, were investigated. The results showed that almost 90% of Reactive Red 3BS ions were successfully extracted with 10 times enrichment in the stripping phase at the optimum conditions of 0.2 M TDA, 0.1 M NaHCO3, 5 min of extraction time and 1:5 of treat ratio. Hence, it can be concluded that palm oil possesses a high potential as green diluent in future technology, especially in ELM process for the removal and recovery of Reactive Red 3BS from synthetic dye wastewater.

Liquid Membrane Formulation for Succinic Acid Extraction from Simulated Aqueous Waste Solution

Succinic acid is developing as one of the most competitive new bio-based chemicals. However, the biological production of succinic acid results in difficult product recovery and not economically competitive. Thus, the development of economical method to extract and purify succinic acid is really essential. One of the promising methods for succinic acid extraction is emulsion liquid membrane (ELM). In this study, the ELM process will be develop to recover succinic acid from simulated aqueous waste solution through screening of ELM components; the carrier, diluent and stripping agent using liquid-liquid extraction method. Several parameters such as the possibility of using palm oil as diluent, types of carrier and their concentration, and stripping agents were examined. Outcomes indicate that 21.39 g/l of succinic acid and 0.41 g/l of acetic acid was extracted using Amberlite LA2 in palm oil. Besides, 16.34 g/l succinic acid was recovered selectively over acetic acid by Na2CO3 in stripping process. Therefore, it can be concluded that Amberlite LA2, palm oil, and Na2CO3 has high possibility to be used in liquid membrane formulation for succinic acid extraction.