Effective removal of cationic dyes from aqueous solution using gum ghatti-based biodegradable hydrogel.
Biodegradable hydrogels of gum ghatti (Gg) with a co-polymer mixture of acrylamide (AAm) and methacrylic acid (MAA) (termed as Gg-cl-P(AAm-co-MAA)) were synthesised by microwave-assisted free radical graft co-polymerisation technique. The hydrogel polymer was characterized by FTIR, SEM, and Brunauer-Emmett-Teller techniques. The Gg-cl-P(AAm-co-MAA) hydrogel was studied as an adsorbent for the removal of methylene blue (MB) and methyl violet (MV) from aqueous solutions. Adsorption of both the dyes followed pseudo-second-order kinetics and Langmuir adsorption isotherm models. The hydrogel polymer adsorbed 98% of MB and 95% of MV from aqueous solution. The Gg-cl-P(AAm-co-MAA) maintained its original sorption capacity for three cycles of adsorption-desorption. Furthermore, the hydrogel polymer degraded fully within 50 days in soil compost. In summary, the Gg-cl-P(AAm-co-MAA) hydrogel could be a potential adsorbent for the remediation of dyes from industrial wastewater.
Department of Applied Chemistry, University of Johannesburg, Neend Street, Doornfontein, Johannesburg 2028, South Africa; DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa. Electronic address: mittal.hemant5@gmail.com.
Hemant
H
Mittal
Department of Applied Chemistry, University of Johannesburg, Neend Street, Doornfontein, Johannesburg 2028, South Africa; DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
Arjun
A
Maity
Department of Applied Chemistry, University of Johannesburg, Neend Street, Doornfontein, Johannesburg 2028, South Africa; DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa. Electronic address: rsuprakas@csir.co.za.
Suprakas Sinha
SS
Ray
D000178:Acrylamides / Q000737:chemistry; D000327:Adsorption; D001673:Biodegradation, Environmental; D002412:Cations; D004396:Coloring Agents / Q000302:isolation & purification*; D005840:Gentian Violet / Q000302:isolation & purification*; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008689:Methacrylates / Q000737:chemistry; D008751:Methylene Blue / Q000302:isolation & purification*; D053149:Plant Gums / Q000737:chemistry*; D058105:Polymerization; D012996:Solutions; D013816:Thermodynamics; D014867:Water
D000178:Acrylamides; D002412:Cations; D004396:Coloring Agents; D020100:Hydrogels; D008689:Methacrylates; D053149:Plant Gums; D012996:Solutions; D014867:Water; C008384:methacrylic acid; D005840:Gentian Violet; D008751:Methylene Blue; C015253:gum ghatti
Adsorption; Biodegradation; Gum ghatti; Isotherms; Kinetics; Methyl violet; Methylene blue