Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme
To meet the demand for the separation of specific substances, the construction of porous composite aerogels with a high specific surface area and a strong adsorption capacity is still a challenge. Herein, a sodium alginate/bentonite composite aerogel was efficiently prepared through supercritical fl...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/2310-2861/8/6/359 |
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| author | Jie Zhao Liqin Cao Yong Dong |
| author_facet | Jie Zhao Liqin Cao Yong Dong |
| author_sort | Jie Zhao |
| collection | DOAJ |
| description | To meet the demand for the separation of specific substances, the construction of porous composite aerogels with a high specific surface area and a strong adsorption capacity is still a challenge. Herein, a sodium alginate/bentonite composite aerogel was efficiently prepared through supercritical fluid drying. The aerogel’s volume shrank less during supercritical drying, maintaining its original three-dimensional mesh structure. The resulting aerogel had a large specific surface area (445 m<sup>2</sup>/g), a low density (0.059 g/cm<sup>3</sup>), and a large pore volume (3.617 cm<sup>3</sup>/g). Due to the fixation and intercalation effects, bentonite was uniformly dispersed in the sodium alginate matrixes. The adsorption of lysozyme by the composite aerogel was evaluated, and the results showed that the optimal adsorption pH was 8 when the pH of the phosphoric acid buffer solution was between pH = 5 and 8.5. The time for adsorption to reach equilibrium was 8 h. The adsorption capacity increased with the increase in bentonite content, and when the initial concentration of lysozyme was from 0.2 to 1.2 g/L, the adsorption capacity first increased and then stabilized, and the maximum adsorption amount was 697 mg/g. The adsorption behavior was simulated in the isothermal region, and the linear correlation coefficient of Langmuir isothermal adsorption fitting was found to be 0.997. Thus, this composite aerogel with strong adsorption capacity can be used as a good alternative to enzymatic adsorbents or immobilized materials. |
| first_indexed | 2024-03-09T23:45:14Z |
| format | Article |
| id | doaj.art-de332f786e884b62b177573927f8ea34 |
| institution | Directory Open Access Journal |
| issn | 2310-2861 |
| language | English |
| last_indexed | 2024-03-09T23:45:14Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj.art-de332f786e884b62b177573927f8ea342023-11-23T16:45:32ZengMDPI AGGels2310-28612022-06-018635910.3390/gels8060359Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for LysozymeJie Zhao0Liqin Cao1Yong Dong2Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830017, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830017, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830017, ChinaTo meet the demand for the separation of specific substances, the construction of porous composite aerogels with a high specific surface area and a strong adsorption capacity is still a challenge. Herein, a sodium alginate/bentonite composite aerogel was efficiently prepared through supercritical fluid drying. The aerogel’s volume shrank less during supercritical drying, maintaining its original three-dimensional mesh structure. The resulting aerogel had a large specific surface area (445 m<sup>2</sup>/g), a low density (0.059 g/cm<sup>3</sup>), and a large pore volume (3.617 cm<sup>3</sup>/g). Due to the fixation and intercalation effects, bentonite was uniformly dispersed in the sodium alginate matrixes. The adsorption of lysozyme by the composite aerogel was evaluated, and the results showed that the optimal adsorption pH was 8 when the pH of the phosphoric acid buffer solution was between pH = 5 and 8.5. The time for adsorption to reach equilibrium was 8 h. The adsorption capacity increased with the increase in bentonite content, and when the initial concentration of lysozyme was from 0.2 to 1.2 g/L, the adsorption capacity first increased and then stabilized, and the maximum adsorption amount was 697 mg/g. The adsorption behavior was simulated in the isothermal region, and the linear correlation coefficient of Langmuir isothermal adsorption fitting was found to be 0.997. Thus, this composite aerogel with strong adsorption capacity can be used as a good alternative to enzymatic adsorbents or immobilized materials.https://www.mdpi.com/2310-2861/8/6/359aerogelscompositessodium alginatebentonitesupercritical CO<sub>2</sub>-drying |
| spellingShingle | Jie Zhao Liqin Cao Yong Dong Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme Gels aerogels composites sodium alginate bentonite supercritical CO<sub>2</sub>-drying |
| title | Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme |
| title_full | Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme |
| title_fullStr | Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme |
| title_full_unstemmed | Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme |
| title_short | Composite Aerogel Comprised of Sodium Alginate and Bentonite via Supercritical CO<sub>2</sub> Drying: An Efficient Adsorbent for Lysozyme |
| title_sort | composite aerogel comprised of sodium alginate and bentonite via supercritical co sub 2 sub drying an efficient adsorbent for lysozyme |
| topic | aerogels composites sodium alginate bentonite supercritical CO<sub>2</sub>-drying |
| url | https://www.mdpi.com/2310-2861/8/6/359 |
| work_keys_str_mv | AT jiezhao compositeaerogelcomprisedofsodiumalginateandbentoniteviasupercriticalcosub2subdryinganefficientadsorbentforlysozyme AT liqincao compositeaerogelcomprisedofsodiumalginateandbentoniteviasupercriticalcosub2subdryinganefficientadsorbentforlysozyme AT yongdong compositeaerogelcomprisedofsodiumalginateandbentoniteviasupercriticalcosub2subdryinganefficientadsorbentforlysozyme |