Melamine [KLH]

Functionalized porous organic polymers (POPS) with high Brunauer-Emmett-Teller (BET) surface area (S-BET) and unique porosity are promising for CO2 capture and Hg2+ removal, although their facile synthesis remains a challenge. Herein, a kind of novel amino-functionalized porphyrin-based POPs was developed based on the Friedel-Craft acylation reaction and Schiff-base reaction, and melamine was adopted as both the rigid cross-linking bridges and the amino-functionalized agent for the construction of the polymers. The resultant polymers exhibited high SBET (587 m(2)/g) and pore volume (0.46 cm(3)/g) with abundant amino, imine, and triazine functionalities (42.08 wt %). The CO2 uptake reached 172 mg/g at 273 K and 1.0 bar and the maximum Hg2+ capacity reached 328.1 mg/g. In particular, the characteristic hierarchical micro/mesoporosity of the polymers was beneficial for the kinetic adsorption due to the fast diffusion of Hg2+ in the pore channels. This study offers a facile postfunctionalization strategy to fabricate the functionalized POPs with high surface area and unique hierarchical porosity.

A colorimetric nano-platform is reported for phenobarbital determination in human plasma samples. It is based on the inhibitory effect of phenobarbital on melamine induced aggregation of sodium dodecyl sulfate modified silver nanoparticles. The interaction of melamine and phenobarbital results in the disaggregation of nanoparticles and consequently increase the absorbance intensity proportional to phenobarbital concentration, and color change from purple to yellow. A central composite design as a multivariate optimization approach with four independent parameters (i.e. pH, melamine concentration, nanoparticle concentration and time) was employed to optimize the reaction conditions. In the optimized conditions, the presented method was fully validated by investigation of system linearity, sensitivity, accuracy, precision, and selectivity. The validated method was used for the determination of phenobarbital in plasma samples collected from patients receiving phenobarbital. (C) 2020 Elsevier B.V. All rights reserved.