Lab Report Organic Chemistry

The equipment used for preparation the extraction unit are shown in Figure 1. The pH of aqueous solution containing 10 μg L−1 of Cd (II) and 50 μg L−1 of Pb (II) was adjusted with HNO3 and NaOH (0.1 M). Then 2 mL of this solution was poured into the syringe. Afterward, 2 mg of NDNPG was added to the extraction unit and immersed in an ultrasonic bath for 60 s to disperse the NDNPG in the sample solution and increase the contact surface between the adsorbent and solution. After sonication, NDNPG was separated from sample solution easily by pressing the plunger, the sample solution from the syringe came out and NDNPG adsorbent remain in the syringe. In the next step, for removing interference, the sorbent was washed with distilled water. Then,

For this method, 0.2 g hair was weighed and it was placed in to a beaker. Then, 2 mL of a mixture of HNO3 and H2O2 with a ratio of (2:1, v/v) was added in to beaker and it was placed at room temperature for 10 minutes. Next, the solution was heated on an electric hot plate up to precipitate obtained. The resulting precipitate was dissolved in 10 mL distilled water and the solution was filtered with a Whatman No. 42 filter paper.

Result and discussion

Synthesis of nitrogen doped nanoporous graphene

Nitrogen Doped Nanoporous Graphene (NDNPG) was produced by a chemical vapor deposition (CVD) method with using aniline (AN) and methane as nitrogen and carbon sources over Fe- Mo/MgO catalyst. The catalyst was placed in a quartz boat and then placed in a quartz tube. To grow NDNPG, methane as the carbon source with a flow rate of 50 ml min-1 passed through aniline (as nitrogen source) in gas washing bottle at 〖40〗^℃, and hydrogen, with a flow rate of 250 ml min-1 at 〖1000〗^℃ , was used as carrier gas, for 60 min. The catalyst was activated by hydrogen stream at the flow rate of 300 ml min-1 for 180 min. The furnace, under the nitrogen atmosphere, was cooled down to room temperature and a black product was formed after the end of the reaction.Fig. 3 SEM images of NPNDG at low (a) and high (b)

Two-step purification method was used for removing such impurities. In the first step, 10 g of the pristine NDNPG sample was added to 150 ml of an 18% HCl solution and were mixed for 16 hours at ambient temperature. Then, the mixture was filtered and washed many times with distilled water to be neutralized. In second purification step, the resulting materials dissolved in 6 mol L-1 nitric acid for 3h at 〖70〗^℃. Then, the washing step was repeated with HNO3 solution. The resulting cake was dried at 〖80〗^℃, for 12