Bentonite from Dilinh (Lamdong province, Vietnam) was used for pillaring and organofunctionalization process in the present study. The pillaring agent was obtained through controlled hydrolysis of AlCl3.6H2O/NaOH. Aluminium pillared clay (Al-PILC) was prepared by contacting of Aluminium pillaring agent and Na-montmorillonite (MONT-Na) aqueous suspension with different ratios. Then, Al-PICL was organofunctionalized with cetyltrimethylammonium bromide (CTAB). The obtained materials were characterized by XRD, IR, DTA-TGA, SEM, BET and 27 Al-MAS-NMR methods. On the 27 Al-MAS-NMR spectrography of Keggin ions and Al-PICL tetragonal Aluminium AlO4 and hexagonal Aluminiums AlO6 appears at 66.14 and 0 ppm, respectively. The increase in d001 of basal spacing was as expected since the pillaring causes an expansion in the interlayer distance. SEM is used to probe the change in morphological features of MONT-Na and Al-PILC. The surface morphology of MONT-Na is different from that of Al-PILC. The MONT-Na appears as corn flake like crystals, revealing its extremely fine platy structure. After pillaring, clay has become more porous. This porous appearance probably occurs due to the pillars formed between the interfaces of clay sheets as a result of pillaring and the reduction in certain amorphous phase originally associated with the MONT-Na. IR spectrography improved the interaction between Al-PICL and CTAB. Their adsorption capacity was investigated with methyl orange, methylene blue and copper ion from aqueous solution controlled temperature 298 ± 0.20 K. The obtained results show that Al-PICL-CTAB is best to remove organic contaminants from aqueous solution and also good to treat the water contaminated copper ion before re-use.
In the appearance of the COVID-19 pandemic, many governments had to use the adoption of severe measures to counteract the spread of the infection. Social distancing and lockdown measures have led to a sudden change in people’s habits. People are restricted from traveling and gathering in larger numbers to prevent the COVID-19 pandemic. In that context, the internet plays an important role in supporting e-teaching, remote working, online collaboration, online selling, video streaming, gaming, etc. E-learning in the schools and universities in Viet Nam began at the beginning of school closure after the Tet holiday. E-learning has been carried out simultaneously in all provinces with all educational levels and all available information technology resources. Despite being a low-middle-income country with limited resources, the simultaneous implementation of online learning in Viet Nam has achieved remarkable achievements, contributing to fighting the COVID-19 pandemic in Viet Nam. In this research, we study the effectiveness of chemistry e-teaching and e-learning during the COVID-19 pandemic in northern Viet Nam.
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