Comparative Investigation on Synthesis, Characterization, Dye Decoloration and Remediation of Nutrients from Industrial Effluent by ZnO Metallic Nanoparticle
Description
The present pilot-scale study was focused on synthesis and characterization of metallic nanoparticle (ZnO), decolorization of dyes (Methyl Orange-MO, Rhodamine-RM, Methylene Blue-MB,) using ZnO under two different radiations (UV, Natural Sunlight), and remediation of nutrients (Sulphate, Nitrate, Chromium) from three industrial effluents (Pharma, Inorganic, Mixed) using synthesized metallic nanoparticle under UV & Sunlight, Central Gujarat, India. Dye decoloration (MO) was 0.01, 0.02 & 0.03 gm/L ZnO (1 ppm), Light (6 hours, 100%), Control, 0.01, 0.02 & 0.03 gm/L ZnO (1 ppm), UV (6 hours, 100%); in case of RM, dye decoloration was 0.02 & 0.03 gm/L ZnO (1 ppm), Light (6 hours, 100%), Control, 0.01, 0.02 & 0.03 gm/L ZnO (1 ppm), UV (6 hours, 100%), 0.01, 0.02 & 0.03 gm/L ZnO (2 ppm), UV (6 hours, 100%), 0.02 & 0.03 gm/L ZnO (3 ppm), UV (6 hours, 100%); in case of MB, dye decoloration was Control, 0.01, 0.02 & 0.03 gm/L ZnO (1 ppm), Light (6 hours, 100%), Control, 0.01 & 0.02 gm/L ZnO (1 ppm), UV (6 hours, 100%), 0.01, 0.02 & 0.03 gm/L ZnO (2 ppm, 3 ppm), UV (6 hours, 100%). Mean dye decoloration was observed maximally in MB (91.67%, UV), followed by RM (90.01%, Light), MB (85.63%, Light), MO (67.58%, Light), MO (66.02%, UV) and MO (50.35%, Light). In case of Sulphate, maximum removal (100%) was observed under UV at 0.03 gm/L ZnO compared to 92.08% under Light in Pharma effluent; Nitrate (UV, 100%, 0.03 gm/L ZnO; Light, 98.95%, 0.03 gm/L ZnO, Mixed effluent) and Chromium (Light, 100%, 0.03 gm/L ZnO, Mixed effluent; UV, 100%, 0.03 gm/L ZnO, Pharma & Inorganic effluents). In Mixed effluent (Light), maximum removal of Chromium was reported (100%), followed by Nitrate (98.95%), and Sulphate (65.38%); in Pharma effluent (Light), maximum removal of Sulphate was reported (92.08%), followed by Chromium (88.25%), and Nitrate (20.78%); in Inorganic effluent (Light), maximum removal of Chromium was reported (86.00%), followed by Nitrate (79.80%), and Sulphate (12.23%). In Mixed effluent (UV), maximum removal of Sulphate was reported (94.63%), followed by Nitrate and Chromium (75.00% each); in Pharma effluent (UV), maximum removal of Sulphate & Chromium was reported (100% each), followed by Nitrate (59.45%); in Inorganic effluent (UV), maximum removal of Nitrate & Chromium was reported (100% each), followed by Sulphate (28.13%). The findings of the present study clearly reveals that metallic nanoparticle ZnO has been observed in resourceful dye discoloration of MB very efficiently compared to RM & MO, and remediation of nutrients more proficiently from polluted industrial effluents. The outcomes of this pilot study can be proved as benchmark, concrete and conclusive for dye decoloration as well as nutrients remediation of natural and anthropogenic industrial effluents using synthesized metallic nanoparticle (e.g. ZnO) at lab and industrial scales regionally, nationally and world over.