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Figure 4

From: Selected Heavy Metals Removal From Electroplating Wastewater by Purified and Polyhydroxylbutyrate Functionalized Carbon Nanotubes Adsorbents

Figure 4

(a) Temperature program used in CVD for CNTs synthesis at 700 °C for 45 min. (b) Schematic pathway/mechanism of purified and polymer functionalized carbon nanotubes production (I = as-synthesized/un-purified carbon nanotubes, II = purified carbon nanotubes (P-CNTs), III = acyl-carbon nanotubes (acyl-CNTs), and IV = polymer functionalized carbon nanotubes (PHB-CNTs)). (c) Initial pH versus final equilibrium pH for P-CNTs – pH drift method for determining the zero point of discharge (pHzpc). (d) Initial pH versus final equilibrium pH for PHB-CNTs – pH drift method for determining the zero point of discharge (pHzpc). (e) The schematic diagram of removal of heavy metals from the electroplating wastewater using polymer functionalized carbon nanotubes (PHB-CNTs) via batch adsorption process. (f) Chemical mechanism pathway for the adsorption of heavy metals from the electroplating wastewater using polymer functionalized carbon nanotubes (PHB-CNTs) via batch adsorption process.

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