This paper shows the use of membrane filters in adsorption of solution of tetracycline hydrochloride on graphene materials. The adsorption process was monitored at different wavelengths, different pH values at certain time intervals. The absorbances of the solutions were measured by UV-Vis spectrophotometry at two wavelengths (275 nm and 356 nm), and three pH values (pH 4, pH 7 and pH 10) every 90 minutes for 6 hours of monitoring, with constant stirring in an ultrasonic bath. The results showed decrease in absorbance at both wavelength and in all three pH values which proved the adsorption of tetracycline hydrochloride on GO and rGO. The largest decrease in absorbance was 98.1%. The most suitable pH value for adsorption was pH 4. This paper used a unique approach to filtration through membrane filters, which in the future could lead to the development of membrane filters based on graphene materials.

Abstract Translingual identity, as a part of the trans-paradigm, refers to linguistic, sociocultural, ethno-racial, and religious practices, which are negotiable, fluid, and in motion, transcending mainstream boundaries. This paper expands the translingual literature from the perspective of sociolinguistic disparities of culturally and linguistically diverse Eastern-European immigrant women in Australia, as they become victims of the perpetual foreigner stereotype in their host communities. Using the linguistic ethnography methods, such as open ethnographic observation and semi-structured interview, the study reveals that due to biographical accent, name, and the country of origin, as aspects of translingual identity – Australian-by-passport, those women become the victim of the perpetual foreigner stereotypes, such as ‘perceived as different’ and ‘Russian bride,’ which led to their feelings of inferiority and social inequality. By expanding the scope of the translingual identity and how it is perceived in Australia, this study provides a necessary contribution to the translingual literature, while simultaneously advocating for the quality of life and justice for translingual immigrants in their new home.