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Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas

Masoud Khaleghi Abbasabadi, Saeid Khodabakhshi, Hamid Reza Esmaili Zand, Alimorad Rashidi, Pooya Gholami, Zahra Sherafati

Research on Chemical Intermediates, Volume: 46, Issue: 10, Pages: 4447 - 4463

Swansea University Author: Saeid Khodabakhshi

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DOI (Published version): 10.1007/s11164-020-04214-8

Abstract

In the present research, piperazine grafted-reduced graphene oxide RGO-N-(piperazine) was synthesized through a three-step reaction and employed as a highly efficient nanoadsorbent for H2S gas removal. Temperature optimization within the range of 30–90 °C was set which significantly improved the ads...

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Published in: Research on Chemical Intermediates
ISSN: 0922-6168 1568-5675
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54862
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spelling 2020-09-16T14:40:39.7313152 v2 54862 2020-08-03 Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas 547fd5929a2fd30733277eca799fbf9b Saeid Khodabakhshi Saeid Khodabakhshi true false 2020-08-03 CHEG In the present research, piperazine grafted-reduced graphene oxide RGO-N-(piperazine) was synthesized through a three-step reaction and employed as a highly efficient nanoadsorbent for H2S gas removal. Temperature optimization within the range of 30–90 °C was set which significantly improved the adsorption capacity of the nanoadsorbent. The operational conditions including the initial concentration of H2S (60,000 ppm) with CH4 (15 vol%), H2O (10 vol%), O2 (3 vol%) and the rest by helium gas and gas hour space velocity (GHSV) 4000–6000 h−1 were examined on adsorption capacity. The results of the removal of H2S after 180 min by RGO-N-(piperazine), reduced graphene oxide (RGO), and graphene oxide (GO) were reported as 99.71, 99.18, and 99.38, respectively. Also, the output concentration of H2S after 180 min by RGO-N-(piperazine), RGO, and GO was found to be 170, 488, and 369 ppm, respectively. Both chemisorption and physisorption are suggested as mechanism in which the chemisorption is based on an acid–base reaction between H2S and amine, epoxy, hydroxyl functional groups on the surface of RGO-N-(piperazine), GO, and RGO. The piperazine augmentation of removal percentage can be attributed to the presence of amine functional groups in the case of RGO-N-(piperazine) versus RGO and GO. Finally, analyses of the equilibrium models used to describe the experimental data showed that the three-parameter isotherm equations Toth and Sips provided slightly better fits compared to the three-parameter isotherms. Journal Article Research on Chemical Intermediates 46 10 4447 4463 Springer Science and Business Media LLC 0922-6168 1568-5675 Piperazine-reduced graphene oxide; H2S removal; Chemisorption and physisorption; Nanoadsorbent 1 10 2020 2020-10-01 10.1007/s11164-020-04214-8 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2020-09-16T14:40:39.7313152 2020-08-03T16:59:41.8214585 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Masoud Khaleghi Abbasabadi 1 Saeid Khodabakhshi 2 Hamid Reza Esmaili Zand 3 Alimorad Rashidi 4 Pooya Gholami 5 Zahra Sherafati 6 54862__17880__66c5e8f842624f5fabdeaeb140f3b0f3.pdf 54862.pdf 2020-08-07T10:55:55.0635584 Output 1047301 application/pdf Accepted Manuscript true 2021-07-14T00:00:00.0000000 true English
title Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
spellingShingle Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
Saeid Khodabakhshi
title_short Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
title_full Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
title_fullStr Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
title_full_unstemmed Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
title_sort Covalent modification of reduced graphene oxide with piperazine as a novel nanoadsorbent for removal of H2S gas
author_id_str_mv 547fd5929a2fd30733277eca799fbf9b
author_id_fullname_str_mv 547fd5929a2fd30733277eca799fbf9b_***_Saeid Khodabakhshi
author Saeid Khodabakhshi
author2 Masoud Khaleghi Abbasabadi
Saeid Khodabakhshi
Hamid Reza Esmaili Zand
Alimorad Rashidi
Pooya Gholami
Zahra Sherafati
format Journal article
container_title Research on Chemical Intermediates
container_volume 46
container_issue 10
container_start_page 4447
publishDate 2020
institution Swansea University
issn 0922-6168
1568-5675
doi_str_mv 10.1007/s11164-020-04214-8
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
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description In the present research, piperazine grafted-reduced graphene oxide RGO-N-(piperazine) was synthesized through a three-step reaction and employed as a highly efficient nanoadsorbent for H2S gas removal. Temperature optimization within the range of 30–90 °C was set which significantly improved the adsorption capacity of the nanoadsorbent. The operational conditions including the initial concentration of H2S (60,000 ppm) with CH4 (15 vol%), H2O (10 vol%), O2 (3 vol%) and the rest by helium gas and gas hour space velocity (GHSV) 4000–6000 h−1 were examined on adsorption capacity. The results of the removal of H2S after 180 min by RGO-N-(piperazine), reduced graphene oxide (RGO), and graphene oxide (GO) were reported as 99.71, 99.18, and 99.38, respectively. Also, the output concentration of H2S after 180 min by RGO-N-(piperazine), RGO, and GO was found to be 170, 488, and 369 ppm, respectively. Both chemisorption and physisorption are suggested as mechanism in which the chemisorption is based on an acid–base reaction between H2S and amine, epoxy, hydroxyl functional groups on the surface of RGO-N-(piperazine), GO, and RGO. The piperazine augmentation of removal percentage can be attributed to the presence of amine functional groups in the case of RGO-N-(piperazine) versus RGO and GO. Finally, analyses of the equilibrium models used to describe the experimental data showed that the three-parameter isotherm equations Toth and Sips provided slightly better fits compared to the three-parameter isotherms.
published_date 2020-10-01T04:08:40Z
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