Graphene Aerogel Derived from Luffa Sponge Biochar for Efficient Dye Removal from Wastewater
Authors: Liu, Z., Gao, B., Fu, H., Qin, J., Liu, H., Abdelkader, A. and Kamali, A.R.
Journal: Langmuir
Volume: 41
Issue: 27
Pages: 18028-18044
eISSN: 1520-5827
ISSN: 0743-7463
DOI: 10.1021/acs.langmuir.5c01943
Abstract:In this study, we report for the first time the synthesis of a novel three-dimensional graphene aerogel composite adsorbent (LGA) derived from luffa sponge biochar (LSBC) for the efficient removal of methylene blue (MB) from aqueous solution. The synthesis involves an effective alkali-activated pyrolysis process followed by a one-step solvothermal electrostatic coassembly. LSBC acts as a reinforcing and bridging agent, effectively preventing the aggregation of graphene nanosheets and promoting the formation of a three-dimensional hierarchical porous network. As a result, LSBC imparts several desirable properties to LGA, including superhydrophilicity, with a water contact angle of 8.0°, and abundant oxygen-containing functional groups. Microscopy and surface analyses reveal that LGA possesses a rich pore structure with a specific surface area of 237 m2/g, more than seven times greater than that of GA, significantly enhancing its dye adsorption performance. The effects of pH (4.0–8.0), initial dye concentration (25–250 mg/L), adsorbent dosage (0.1–0.6 g/L), temperature (25–45 °C), and contact time (15–420 min) on adsorption efficiency are systematically investigated. The results show that the adsorption process follows the Langmuir isotherm and pseudo-second-order kinetic models. The MB removal mechanism is primarily governed by π–π interactions, hydrogen bonding, electrostatic attraction and pore filling, with a maximum adsorption capacity of 1108.5 mg/g at pH 6.0, outperforming most reported biomass-based graphene adsorbents. Furthermore, LGA demonstrates excellent stability and reusability, retaining >90% of its initial adsorption capacity after 12 consecutive adsorption–desorption cycles. This low-cost, high-performance adsorbent offers an effective and sustainable solution for dye-contaminated wastewater treatment, while also demonstrating the high-value utilization of agricultural waste.
Source: Scopus
Graphene Aerogel Derived from Luffa Sponge Biochar for Efficient Dye Removal from Wastewater.
Authors: Liu, Z., Gao, B., Fu, H., Qin, J., Liu, H., Abdelkader, A. and Kamali, A.R.
Journal: Langmuir
Volume: 41
Issue: 27
Pages: 18028-18044
eISSN: 1520-5827
DOI: 10.1021/acs.langmuir.5c01943
Abstract:In this study, we report for the first time the synthesis of a novel three-dimensional graphene aerogel composite adsorbent (LGA) derived from luffa sponge biochar (LSBC) for the efficient removal of methylene blue (MB) from aqueous solution. The synthesis involves an effective alkali-activated pyrolysis process followed by a one-step solvothermal electrostatic coassembly. LSBC acts as a reinforcing and bridging agent, effectively preventing the aggregation of graphene nanosheets and promoting the formation of a three-dimensional hierarchical porous network. As a result, LSBC imparts several desirable properties to LGA, including superhydrophilicity, with a water contact angle of 8.0°, and abundant oxygen-containing functional groups. Microscopy and surface analyses reveal that LGA possesses a rich pore structure with a specific surface area of 237 m2/g, more than seven times greater than that of GA, significantly enhancing its dye adsorption performance. The effects of pH (4.0-8.0), initial dye concentration (25-250 mg/L), adsorbent dosage (0.1-0.6 g/L), temperature (25-45 °C), and contact time (15-420 min) on adsorption efficiency are systematically investigated. The results show that the adsorption process follows the Langmuir isotherm and pseudo-second-order kinetic models. The MB removal mechanism is primarily governed by π-π interactions, hydrogen bonding, electrostatic attraction and pore filling, with a maximum adsorption capacity of 1108.5 mg/g at pH 6.0, outperforming most reported biomass-based graphene adsorbents. Furthermore, LGA demonstrates excellent stability and reusability, retaining >90% of its initial adsorption capacity after 12 consecutive adsorption-desorption cycles. This low-cost, high-performance adsorbent offers an effective and sustainable solution for dye-contaminated wastewater treatment, while also demonstrating the high-value utilization of agricultural waste.
Source: PubMed
Graphene Aerogel Derived from Luffa Sponge Biochar for Efficient Dye Removal from Wastewater
Authors: Liu, Z., Gao, B., Fu, H., Qin, J., Liu, H., Abdelkader, A. and Kamali, A.R.
Journal: LANGMUIR
Volume: 41
Issue: 27
Pages: 18028-18044
eISSN: 1520-5827
ISSN: 0743-7463
DOI: 10.1021/acs.langmuir.5c01943
Source: Web of Science (Lite)
Graphene Aerogel Derived from Luffa Sponge Biochar for Efficient Dye Removal from Wastewater.
Authors: Liu, Z., Gao, B., Fu, H., Qin, J., Liu, H., Abdelkader, A. and Kamali, A.R.
Journal: Langmuir : the ACS journal of surfaces and colloids
Volume: 41
Issue: 27
Pages: 18028-18044
eISSN: 1520-5827
ISSN: 0743-7463
DOI: 10.1021/acs.langmuir.5c01943
Abstract:In this study, we report for the first time the synthesis of a novel three-dimensional graphene aerogel composite adsorbent (LGA) derived from luffa sponge biochar (LSBC) for the efficient removal of methylene blue (MB) from aqueous solution. The synthesis involves an effective alkali-activated pyrolysis process followed by a one-step solvothermal electrostatic coassembly. LSBC acts as a reinforcing and bridging agent, effectively preventing the aggregation of graphene nanosheets and promoting the formation of a three-dimensional hierarchical porous network. As a result, LSBC imparts several desirable properties to LGA, including superhydrophilicity, with a water contact angle of 8.0°, and abundant oxygen-containing functional groups. Microscopy and surface analyses reveal that LGA possesses a rich pore structure with a specific surface area of 237 m2/g, more than seven times greater than that of GA, significantly enhancing its dye adsorption performance. The effects of pH (4.0-8.0), initial dye concentration (25-250 mg/L), adsorbent dosage (0.1-0.6 g/L), temperature (25-45 °C), and contact time (15-420 min) on adsorption efficiency are systematically investigated. The results show that the adsorption process follows the Langmuir isotherm and pseudo-second-order kinetic models. The MB removal mechanism is primarily governed by π-π interactions, hydrogen bonding, electrostatic attraction and pore filling, with a maximum adsorption capacity of 1108.5 mg/g at pH 6.0, outperforming most reported biomass-based graphene adsorbents. Furthermore, LGA demonstrates excellent stability and reusability, retaining >90% of its initial adsorption capacity after 12 consecutive adsorption-desorption cycles. This low-cost, high-performance adsorbent offers an effective and sustainable solution for dye-contaminated wastewater treatment, while also demonstrating the high-value utilization of agricultural waste.
Source: Europe PubMed Central