Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution
Heavy metal ions have a toxic and negative influences on the environment and human health even at low concentrations and need to be removed from wastewater. Chitosan and graphene oxide are suitable nano plate adsorbents with high adsorption potential because of their π-π interaction, and they are av...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-08-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/12/9/1922 |
| _version_ | 1797555530252681216 |
|---|---|
| author | Sepehr Azizkhani Ebrahim Mahmoudi Norhafizah Abdullah Mohd Halim Shah Ismail Abdul Wahab Mohammad Siti Aslina Hussain |
| author_facet | Sepehr Azizkhani Ebrahim Mahmoudi Norhafizah Abdullah Mohd Halim Shah Ismail Abdul Wahab Mohammad Siti Aslina Hussain |
| author_sort | Sepehr Azizkhani |
| collection | DOAJ |
| description | Heavy metal ions have a toxic and negative influences on the environment and human health even at low concentrations and need to be removed from wastewater. Chitosan and graphene oxide are suitable nano plate adsorbents with high adsorption potential because of their π-π interaction, and they are available functional groups that interact with other elements. In this study, graphene oxide was coated with silica to enhance the hydrophilicity of the adsorbent. Subsequently, the adsorbent was functionalised by various amounts of chitosan to improve the Pb(II) removal. The adsorbent was analysed using transmission electron microscopy (TEM), Raman, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and mapping analysis techniques. An investigation of the influences of the initial concentration of Pb(II), pH and contact time were included to obtain the optimum amount of adsorption. The range of the initial Pb(II) concentration studied was from 10 to 120 mg/L. The pH factor ranged from 3 to 8 with contact time from 0 to 140 min. Freundlich, Temkin and Langmuir isotherm models were fit to the results, and a pseudo-second-order kinetic model was found to provide a good fit as well. The maximum Pb(II) removal capacity achieved was 256.41 (+/− 4%) mg/g based on Langmuir isotherms. |
| first_indexed | 2024-03-10T16:49:52Z |
| format | Article |
| id | doaj.art-7395c4171b1b4439aa3c4b2b489da051 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T16:49:52Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-7395c4171b1b4439aa3c4b2b489da0512023-11-20T11:21:51ZengMDPI AGPolymers2073-43602020-08-01129192210.3390/polym12091922Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous SolutionSepehr Azizkhani0Ebrahim Mahmoudi1Norhafizah Abdullah2Mohd Halim Shah Ismail3Abdul Wahab Mohammad4Siti Aslina Hussain5Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, DE, MalaysiaDepartment of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM Bangi 43600, Selangor, DE, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, DE, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, DE, MalaysiaDepartment of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM Bangi 43600, Selangor, DE, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, DE, MalaysiaHeavy metal ions have a toxic and negative influences on the environment and human health even at low concentrations and need to be removed from wastewater. Chitosan and graphene oxide are suitable nano plate adsorbents with high adsorption potential because of their π-π interaction, and they are available functional groups that interact with other elements. In this study, graphene oxide was coated with silica to enhance the hydrophilicity of the adsorbent. Subsequently, the adsorbent was functionalised by various amounts of chitosan to improve the Pb(II) removal. The adsorbent was analysed using transmission electron microscopy (TEM), Raman, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and mapping analysis techniques. An investigation of the influences of the initial concentration of Pb(II), pH and contact time were included to obtain the optimum amount of adsorption. The range of the initial Pb(II) concentration studied was from 10 to 120 mg/L. The pH factor ranged from 3 to 8 with contact time from 0 to 140 min. Freundlich, Temkin and Langmuir isotherm models were fit to the results, and a pseudo-second-order kinetic model was found to provide a good fit as well. The maximum Pb(II) removal capacity achieved was 256.41 (+/− 4%) mg/g based on Langmuir isotherms.https://www.mdpi.com/2073-4360/12/9/1922adsorptiongraphene oxidechitosansynthesisisothermadsorbent |
| spellingShingle | Sepehr Azizkhani Ebrahim Mahmoudi Norhafizah Abdullah Mohd Halim Shah Ismail Abdul Wahab Mohammad Siti Aslina Hussain Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution Polymers adsorption graphene oxide chitosan synthesis isotherm adsorbent |
| title | Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution |
| title_full | Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution |
| title_fullStr | Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution |
| title_full_unstemmed | Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution |
| title_short | Synthesis and Characterisation of Graphene Oxide-Silica-Chitosan for Eliminating the Pb(II) from Aqueous Solution |
| title_sort | synthesis and characterisation of graphene oxide silica chitosan for eliminating the pb ii from aqueous solution |
| topic | adsorption graphene oxide chitosan synthesis isotherm adsorbent |
| url | https://www.mdpi.com/2073-4360/12/9/1922 |
| work_keys_str_mv | AT sepehrazizkhani synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution AT ebrahimmahmoudi synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution AT norhafizahabdullah synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution AT mohdhalimshahismail synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution AT abdulwahabmohammad synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution AT sitiaslinahussain synthesisandcharacterisationofgrapheneoxidesilicachitosanforeliminatingthepbiifromaqueoussolution |