Aqueous ammonium hydroxide nh4oh

Chemical deconstruction of PC particles was carried out in a 200-mL custom batch reactor, with an aqueous ammonia environment. Aqueous ammonium hydroxide (NH₄OH; 28 to 30% wt) was provided by Sigma-Aldrich (St. Louis, MO). Different concentrations of NH₄OH solutions were prepared by mixing the NH₄OH solutions (28 to 30% wt) with distilled water. A heating tape (HTS/Amptek) was attached to the external wall of the reactor to heat up the batch reactor, and K-type thermocouples were utilized to monitor the temperature of the liquid mixture in the reactor. Five grams of PC particles and 175 mL 28 to 30% NH₄OH solution were added in the reactor and reacted for 30 min at 120°C. The final liquid product was filtered with Whatman no. 42 filter paper (diameter, 55 mm; pore size, 2.5 μm). Solid products remaining on the filter paper were dried at 55°C in the oven overnight. The liquid product was neutralized to pH 7 using phosphoric acid. Samples were stirred using a magnetic Teflon stir bar and monitored using a pH meter during neutralization.

Chemical deconstruction of PC particles was carried out in a 200-mL custom batch reactor, with an aqueous ammonia environment. Aqueous ammonium hydroxide (NH₄OH; 28 to 30% wt) was provided by Sigma-Aldrich (St. Louis, MO). Different concentrations of NH₄OH solutions were prepared by mixing the NH₄OH solutions (28 to 30% wt) with distilled water. A heating tape (HTS/Amptek) was attached to the external wall of the reactor to heat up the batch reactor, and K-type thermocouples were utilized to monitor the temperature of the liquid mixture in the reactor. Five grams of PC particles and 175 mL 28 to 30% NH₄OH solution were added in the reactor and reacted for 30 min at 120°C. The final liquid product was filtered with Whatman no. 42 filter paper (diameter, 55 mm; pore size, 2.5 μm). Solid products remaining on the filter paper were dried at 55°C in the oven overnight. The liquid product was neutralized to pH 7 using phosphoric acid. Samples were stirred using a magnetic Teflon stir bar and monitored using a pH meter during neutralization.