Synthesis Of Mg-Al Layered Double Hydroxide Lab Report

Preparation of PoPD fabricated of Mg-Al layered double hydroxides
0.356 g of Magnesium nitrate (0.3 M) and 0.169 g of Aluminium nitrate (0.1 M) solution were containing in 100 ml beaker with continuous stirring (1:3 ratio) and followed by 0.700 g of urea (0.5 M) was added into the solution. The reaction mixture was maintained basic medium using 1 g of NaOH solution was added drop by drop into the above metal solution. The mixture was stirred for 30 min and the precipitate was poured into the 50 ml auto clave vessel using Millipore water. The solution was aged homogeneously at 160 oC for 12h. After that the solutions was centrifuged at 8000 rpm and washed many times using DD water with ethanol. The final products are dried at 60 oC in hot
All electrochemical sensing experiments were carried out using a CHI 1103A electrochemical station connected to a PC. 0.2 M phosphate buffer solution (PBS) were used all the electrochemical experiments, pH 7 in a conventional three-electrode system Platinum wire and saturated calomel electrode (SCE) were used as the counter electrode and reference electrode respectively. modified Glassy Carbon Electrode as the working electrode. For cyclic voltammetric measurements, the sensors were immersed in 10 mL of 0.2 M PBS containing 1×10 −4 M DA, applying the potential in the range of -0.4 V to +1 V in 0.2 M PBS at pH 7. The PoPD@Mg-Al LDH was placed in 1 ml DA in a pH 7 solution and allowed to accumulate at open circuit potential for 1 minute. All the electrochemical experiments were carried out at room temperature (25
2 (a) DRS-UV spectrum of PoPD@Mg-Al LDH (b) Photoluminescence of PoPD@Mg-Al LDH (c&d) FESEM images of Mg-Al LDH and PoPD@Mg-Al LDH
Field Emission Scanning Electron Microscopy (FESEM)
Fig.2 (c&d) displays the surface morphology of the as-synthesized Mg-Al LDH and PoPd fabricated Mg-Al LDH was examined using scanning electron microscopy (FESEM). Fig. 2c shows the FESEM image of pure LDH displays the formation of petals-like structure and furthermore the petals are arranged to get together with clean and smooth surfaces but after fabricating the PoPD the regular platelets are broken and forms irregular platelets were displays at Fig. 2d. From the FESEM analyses the particle size was measured, the approximate size is 160 nm.
Electrochemical sensing Dopamine
Cyclic voltammograms behavior of Dopamine
The prepared polymer fabricated layered double hydroxides of PoPD@Mg-Al LDH was highly sensivity towards DA in 0.2 M phosphate buffer solution at pH 7. Fig. 3 represents the absence and presence of DA cyclic voltammograms (CVs) in a phosphate buffer solution. The potential was scanned between -0.4 and +1 V. Fig. 3(a) bare electrode here no redox peaks were detected in the absence of DA. Fig. 3(a) revealed that the PoPD@Mg-Al LDH composite electrode exhibited an intense and sharp anodic peak current at +0.346 V due to the electrocatalytic oxidation of dopamine when 1 ml of DA was present in the 0.2 M PBS at pH 7. Following the corresponding reduction peak appeared at +0.275V but