Facile preparation of graphene nitride by irradiating MHz ultrasound.

The present study aimed at developing a simple sonochemical method to prepare graphene nitride from the mixture of graphite and aqueous ammonia solution. Ultrasound of 1.6 MHz was irradiated to the sample in a fabricated sonoreactor at predetermined ultrasonic power and duration.

Evaluation of Mass-transfer Performance of Emulsion-flow Column with Height of Transfer Unit (HTU) and Number of Theoretical Plates, and Comparison of HTU with Column-type Extractors.

The performance of iodine extraction in the emulsion-flow column was evaluated using an indicator of difficulty in separation, height of transfer unit, HTU and of the number of theoretical plates, N. Resulting HTU values ranged from 0.15 to 0.

Removal of nitrate-nitrogen from drinking water using bamboo powder charcoal.

The adsorption effectiveness of bamboo powder charcoal (BPC); made from the residual of Moso bamboo manufacturing; in removing nitrate-nitrogen from water has been investigated. Commercial activated carbon (CAC) was also used to compare the effectiveness of adsorption in removal of nitrate-nitrogen. The adsorption effectiveness of BPC was higher than that of CAC; regardless of the concentration of nitrate-nitrogen; in the range of 0-10 mg/l.