Novel zwitterionic polymer-grafted porous silica microspheres were prepared by using sodium 2-bromoethanesulfonate to quaternize the pyridyl side chains of the polymer, which is anchored on the surface of porous silica. The separation behavior for toluene and benzoic acid proved that the zwitterionic polymer-grafted porous silica worked as a stationary phase in hydrophilic interaction/ion exchange mixed-mode chromatography. Compared with a conventional sulfobetaine-based zwitterion-grafted porous silica column, the prepared poly(vinylpyridinium ethanesulfonate)-immobilized porous silica afforded the highly selective separation of benzoic acid derivatives over a wide pH range, and the separation behavior was quite sensitive to the protonation state of the carboxylic acids. The high selectivity was attributed to the multiple interactions between the guest molecule and the zwitterionic groups on the polymer chains. The new zwitterionic stationary phase demonstrated excellent selectivity for hydrophilic biorelated molecules such as nucleobases and nucleosides.

During the past decades, many conventional technologies of wastewater treatment have been utilized but they are ineffective in removing recently emerging substance of concern such as pharmaceuticals, pesticides, personal care...

Water is one of the most important media which profoundly influences various processes such as pre-treatment, dyeing, printing and finishing process of textile materials. Any type of contamination or impurity in water used therefore requires maximum level of purification leading to the higher cost of finished products. Groundwater quality from various industrial zones in Bangladesh was assessed to determine whether the resource was of a suitable quality for industrial use. Parameters determining the water quality such as hardness, pH, turbidity, total dissolved solids (TDS), alkalinity, chloride content, dissolved iron, and conductivity of collected groundwater were measured. It was found that the quality of groundwater from Gazipur and Mymensingh zones is significantly remarkable than other studied zones, while the groundwater of other zones are also suitable for the use of textile processing after mild treatment. This study based on the water quality can have also a great impact to find and set up cost effective and efficient textile and related industries in Bangladesh.