Fig. 1. Scanning electron microscope and energy dispersive X-ray patterns of (a) MWCNT, and (b) activated carbon.
Fig. 2. Effect of contact time on the adsorption of Ni (a) and Cu (b) from aqueous solution by MWCNT and activated carbon (experimental conditions: pH0=2±0.1; Adsorbent dosage 1.2 g; 25 ℃; 20 rpm; metal ion concentration = 100 mg/L; n=2)
Fig. 3. Effect initial pH on the adsorption of heavy metals and pH evolution of Ni (a, c) and Cu (b, d) solutions (experimental conditions: pH0=2±0.1, 7±0.1; Adsorbent dosage 1.2 g; 25 ℃; 20 rpm; metal ion concentration = 100 mg/L; n=2)
Fig. 4. Effect of adsorbent dosage on the adsorption and pH evolution of Ni (a, c) and Cu (b, d) solution by each adsorbent (experimental conditions: pH0=1.9±0.1, Adsorbent dosage 0.2 g, 0.4 g, 0.6 g, 0.8 g, 1.0 g, 1.2 g; 25 ℃; 20 rpm; metal ion concentration = 100 mg/L; n=2)
Fig. 5. Effect of UV/H2O2 pretreatment on the removal of Ni and Cu from synthesized waste water (experimental conditions: pH0=7.0±0.1; 25 ℃; 20 rpm; [H2O2]0: 1.9 mg/L; [CN]0 = 2.4 mg/L; [Ni]0 = 132 mg/L; [Cu]0 = 148 mg/L; UV-C intensity: 1.2 mW/cm2; 2hr; n=2)
Table 1. Characteristics of the adsorbents
Table 2. Pseudo-first order rate constant and R2 value for the adsorption of Ni and Cu by MWCNT
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