Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions
A chitosan (CH) cryogel is a supermacropore material that can be used as an adsorbent. However, its utilization as a metal adsorbent is limited due to its low stability in acidic conditions. A CH cryogel has been modified using tripolyphosphate (TPP) and tannic acid (TA) as biocompatible cross-linke...
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The Royal Society
2025-08-01
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| Online Access: | https://royalsocietypublishing.org/doi/10.1098/rsos.242274 |
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| author | Jaya Hardi Tristan Tijsseling Hayato Takase Masahiro Yoshida Koichiro Shiomori Hideki Matsune |
| author_facet | Jaya Hardi Tristan Tijsseling Hayato Takase Masahiro Yoshida Koichiro Shiomori Hideki Matsune |
| author_sort | Jaya Hardi |
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| description | A chitosan (CH) cryogel is a supermacropore material that can be used as an adsorbent. However, its utilization as a metal adsorbent is limited due to its low stability in acidic conditions. A CH cryogel has been modified using tripolyphosphate (TPP) and tannic acid (TA) as biocompatible cross-linkers. TPP increases the stability of the cryogels in acidic solutions, and TA increases their mechanical properties. CH-TPP, CH-TPP2.5-TA, CH-TPP5-TA and CH-TPP7.5-TA cryogels were applied for the adsorption of Cu2+ ions. The CH-TPP-TA cryogels reached optimum conditions at pH 5.0 with a removal efficiency of 91–96%. The adsorption of Cu2+ ions by CH-TPP-TA cryogels fits the nonlinear Freundlich isotherm, or Cu2+ is adsorbed on the heterogeneous cryogels’ surfaces. CH-TPP5-TA has an adsorption capacity up to 109 mg g−1 at an initial Cu2+ concentration of 500 mg l−1. The adsorption kinetics of Cu2+ ions follows pseudo-second order. It is interpreted that the adsorption mechanism is generally through chemical interactions. Copper elements are proven to be adsorbed by the cryogel, which is detected by energy-dispersive X-ray analysis. The photographic results show that Cu2+ ions can be adsorbed into the inner layer of the cryogel. Finally, the CH-TPP-TA cryogel is promising to be used as a biocompatible adsorbent for copper. |
| format | Article |
| id | doaj-art-aab77a37d256487c8314b60485f6ee98 |
| institution | Kabale University |
| issn | 2054-5703 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | The Royal Society |
| record_format | Article |
| series | Royal Society Open Science |
| spelling | doaj-art-aab77a37d256487c8314b60485f6ee982025-08-20T03:59:22ZengThe Royal SocietyRoyal Society Open Science2054-57032025-08-0112810.1098/rsos.242274Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ionsJaya Hardi0Tristan Tijsseling1Hayato Takase2Masahiro Yoshida3Koichiro Shiomori4Hideki Matsune5University of Miyazaki, Miyazaki, JapanAvans University of Applied Sciences in Breda, Breda, The NetherlandsDepartment of Chemical Engineering, Kagoshima University, Kagoshima, JapanDepartment of Chemical Engineering, Kagoshima University, Kagoshima, JapanDepartment of Applied Chemistry, University of Miyazaki, Miyazaki, Miyazaki Prefecture, JapanDepartment of Applied Chemistry, University of Miyazaki, Miyazaki, Miyazaki Prefecture, JapanA chitosan (CH) cryogel is a supermacropore material that can be used as an adsorbent. However, its utilization as a metal adsorbent is limited due to its low stability in acidic conditions. A CH cryogel has been modified using tripolyphosphate (TPP) and tannic acid (TA) as biocompatible cross-linkers. TPP increases the stability of the cryogels in acidic solutions, and TA increases their mechanical properties. CH-TPP, CH-TPP2.5-TA, CH-TPP5-TA and CH-TPP7.5-TA cryogels were applied for the adsorption of Cu2+ ions. The CH-TPP-TA cryogels reached optimum conditions at pH 5.0 with a removal efficiency of 91–96%. The adsorption of Cu2+ ions by CH-TPP-TA cryogels fits the nonlinear Freundlich isotherm, or Cu2+ is adsorbed on the heterogeneous cryogels’ surfaces. CH-TPP5-TA has an adsorption capacity up to 109 mg g−1 at an initial Cu2+ concentration of 500 mg l−1. The adsorption kinetics of Cu2+ ions follows pseudo-second order. It is interpreted that the adsorption mechanism is generally through chemical interactions. Copper elements are proven to be adsorbed by the cryogel, which is detected by energy-dispersive X-ray analysis. The photographic results show that Cu2+ ions can be adsorbed into the inner layer of the cryogel. Finally, the CH-TPP-TA cryogel is promising to be used as a biocompatible adsorbent for copper.https://royalsocietypublishing.org/doi/10.1098/rsos.242274cryogelchitosantannic acidtripolyphosphateadsorbentCu2+ ions |
| spellingShingle | Jaya Hardi Tristan Tijsseling Hayato Takase Masahiro Yoshida Koichiro Shiomori Hideki Matsune Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions Royal Society Open Science cryogel chitosan tannic acid tripolyphosphate adsorbent Cu2+ ions |
| title | Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions |
| title_full | Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions |
| title_fullStr | Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions |
| title_full_unstemmed | Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions |
| title_short | Chitosan-tripolyphosphate-tannic acid cryogels as a biocompatible adsorbent for the removal of Cu2+ ions |
| title_sort | chitosan tripolyphosphate tannic acid cryogels as a biocompatible adsorbent for the removal of cu2 ions |
| topic | cryogel chitosan tannic acid tripolyphosphate adsorbent Cu2+ ions |
| url | https://royalsocietypublishing.org/doi/10.1098/rsos.242274 |
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