Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies
Heavy metal ions (HMIs) are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompted the development of novel materials. In this study, tris(2-benzimidazolylmethyl)amine (NTB) was impregnated into MIL-101-(Cr) metal-organic framework...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-07-01
|
| Series: | Water |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4441/15/14/2559 |
| _version_ | 1797587153573642240 |
|---|---|
| author | Phani Brahma Somayajulu Rallapalli Suk Soon Choi Hiresh Moradi Jae-Kyu Yang Jae-Hoon Lee Jeong Hyub Ha |
| author_facet | Phani Brahma Somayajulu Rallapalli Suk Soon Choi Hiresh Moradi Jae-Kyu Yang Jae-Hoon Lee Jeong Hyub Ha |
| author_sort | Phani Brahma Somayajulu Rallapalli |
| collection | DOAJ |
| description | Heavy metal ions (HMIs) are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompted the development of novel materials. In this study, tris(2-benzimidazolylmethyl)amine (NTB) was impregnated into MIL-101-(Cr) metal-organic framework using an incipient wetness impregnation approach, and the ability of the composite material to adsorb Hg<sup>2+</sup> ions from the water was examined. The synthesized materials were analyzed with several physico-chemical techniques such as powder X-ray diffraction, elemental analysis, scanning electron microscopy, thermogravimetric analysis, nitrogen sorption isotherms at 77 K, and X-ray photoelectron spectrometry. MIL-101-NTB quickly adsorbs 93.9% of Hg<sup>2+</sup> ions within 10 min from a 10.0 ppm single ion solution. A better fit of the kinetic data to a pseudo-second-order model validated the chemisorption of Hg<sup>2+</sup> ions on MIL-101-NTB. The experimental data fitted well with the Langmuir isotherm model, and the maximum adsorption capacity obtained at 125 ppm initial concentration was 111.03 mg/g. Despite the presence of other competing ions (Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Cd<sup>2+</sup>), high Hg<sup>2+</sup> ions removal efficiency (99.6%, 1.0 ppm initial concentration) was maintained in the diverse ion batch adsorption studies. A 0.2 M EDTA solution could desorb the Hg<sup>2+</sup> ions, and cyclic Hg<sup>2+</sup> ions sorption studies indicated that MIL-101-NTB might have a high Hg<sup>2+</sup> ions removal efficiency for at least five consecutive cycles. Based on the FTIR and XPS analyses, Hg<sup>2+</sup> ions chelation by NTB molecules and electrostatic interactions between Hg<sup>2+</sup> ions and carboxylate groups in MIL-101-NTB are plausible mechanisms for Hg<sup>2+</sup> ions adsorption. |
| first_indexed | 2024-03-11T00:33:12Z |
| format | Article |
| id | doaj.art-583ea70cbec6479eaf460f82a88d57bd |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T00:33:12Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-583ea70cbec6479eaf460f82a88d57bd2023-11-18T21:47:03ZengMDPI AGWater2073-44412023-07-011514255910.3390/w15142559Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal StudiesPhani Brahma Somayajulu Rallapalli0Suk Soon Choi1Hiresh Moradi2Jae-Kyu Yang3Jae-Hoon Lee4Jeong Hyub Ha5Department of Integrated Environmental Systems, Pyeongtaek University, Pyeongtaek 17869, Republic of KoreaDepartment of Biological and Environmental Engineering, Semyung University, Jecheon 27236, Republic of KoreaDepartment of Environmental Engineering, Kwangwoon University, Seoul 01897, Republic of KoreaDepartment of Environmental Engineering, Kwangwoon University, Seoul 01897, Republic of KoreaENVIONEER Co., Ltd., Jecheon 27116, Republic of KoreaDepartment of Integrated Environmental Systems, Pyeongtaek University, Pyeongtaek 17869, Republic of KoreaHeavy metal ions (HMIs) are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompted the development of novel materials. In this study, tris(2-benzimidazolylmethyl)amine (NTB) was impregnated into MIL-101-(Cr) metal-organic framework using an incipient wetness impregnation approach, and the ability of the composite material to adsorb Hg<sup>2+</sup> ions from the water was examined. The synthesized materials were analyzed with several physico-chemical techniques such as powder X-ray diffraction, elemental analysis, scanning electron microscopy, thermogravimetric analysis, nitrogen sorption isotherms at 77 K, and X-ray photoelectron spectrometry. MIL-101-NTB quickly adsorbs 93.9% of Hg<sup>2+</sup> ions within 10 min from a 10.0 ppm single ion solution. A better fit of the kinetic data to a pseudo-second-order model validated the chemisorption of Hg<sup>2+</sup> ions on MIL-101-NTB. The experimental data fitted well with the Langmuir isotherm model, and the maximum adsorption capacity obtained at 125 ppm initial concentration was 111.03 mg/g. Despite the presence of other competing ions (Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Cd<sup>2+</sup>), high Hg<sup>2+</sup> ions removal efficiency (99.6%, 1.0 ppm initial concentration) was maintained in the diverse ion batch adsorption studies. A 0.2 M EDTA solution could desorb the Hg<sup>2+</sup> ions, and cyclic Hg<sup>2+</sup> ions sorption studies indicated that MIL-101-NTB might have a high Hg<sup>2+</sup> ions removal efficiency for at least five consecutive cycles. Based on the FTIR and XPS analyses, Hg<sup>2+</sup> ions chelation by NTB molecules and electrostatic interactions between Hg<sup>2+</sup> ions and carboxylate groups in MIL-101-NTB are plausible mechanisms for Hg<sup>2+</sup> ions adsorption.https://www.mdpi.com/2073-4441/15/14/2559heavy metal ionadsorptionmetal-organic frameworktris(2-benzimidazolylmethyl)aminewater treatment |
| spellingShingle | Phani Brahma Somayajulu Rallapalli Suk Soon Choi Hiresh Moradi Jae-Kyu Yang Jae-Hoon Lee Jeong Hyub Ha Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies Water heavy metal ion adsorption metal-organic framework tris(2-benzimidazolylmethyl)amine water treatment |
| title | Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies |
| title_full | Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies |
| title_fullStr | Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies |
| title_full_unstemmed | Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies |
| title_short | Tris(2-benzimidazolyl)amine (NTB)-Modified Metal-Organic Framework: Preparation, Characterization, and Mercury Ion Removal Studies |
| title_sort | tris 2 benzimidazolyl amine ntb modified metal organic framework preparation characterization and mercury ion removal studies |
| topic | heavy metal ion adsorption metal-organic framework tris(2-benzimidazolylmethyl)amine water treatment |
| url | https://www.mdpi.com/2073-4441/15/14/2559 |
| work_keys_str_mv | AT phanibrahmasomayajulurallapalli tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies AT suksoonchoi tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies AT hireshmoradi tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies AT jaekyuyang tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies AT jaehoonlee tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies AT jeonghyubha tris2benzimidazolylaminentbmodifiedmetalorganicframeworkpreparationcharacterizationandmercuryionremovalstudies |