Scholarlink

<p>Global water scarcity and soil desertification underscore the critical need for efficient, cost-effective water-retentive materials in sustainable agriculture. To address this, graphene oxide (GO), carbon nanotubes (CNT), and rice husk biochar (RBC) were incorporated into an acrylic acid/2-acrylamido-2-methylpropanesulfonic acid/sodium alginate copolymer network, fabricating three carbon-composite superabsorbent polymers (GO-SAP, CNT-SAP, RBC-SAP). Systematic evaluation revealed that carbon materials dispersed uniformly within the polymer matrix via hydrogen bonding and van der Waals forces, with surface oxygen-containing groups significantly enhancing hydrophilicity. XRD and SEM analyses confirmed amorphous porous structures, with GO-SAP and RBC-SAP exhibiting superior pore distribution. Maximum swelling ratios occurred at loadings of 0.08&#xa0;g (GO), 0.12&#xa0;g (CNT), and 0.12&#xa0;g (RBC). At equivalent loadings, GO-SAP demonstrated the highest absorption capacity, attributable to GO’s strong hydrophilicity, 2D lamellar structure, and exceptional dispersibility. All composites maintained high swelling ratios between pH 5–10 and 20–50&#xa0;°C but showed sensitivity to multivalent ions. Swelling kinetics followed a pseudo-second-order model (R<sup>2</sup> &gt; 0.99), indicating chemically controlled absorption governed by hydrophilic groups. Remarkably, the composites retained water for &gt; 4.5&#xa0;h at 50&#xa0;°C and preserved &gt; 97% water retention after centrifugation (12,000&#xa0;rpm). Cyclic stability exceeded 80% of initial swelling capacity after 6 absorption-desorption cycles. This work provides a robust foundation for developing high-performance, sustainable superabsorbents.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation and performance analysis of carbon-based composite superabsorbent polymers

  • 期刊论文

  • 发表日期：

    2025年12月2日

查看全文
  • Xiangpeng Wang,
  • Yunxiang Zheng,
  • Chunxiao Zhang,
  • Chunmao Chen

摘要

Global water scarcity and soil desertification underscore the critical need for efficient, cost-effective water-retentive materials in sustainable agriculture. To address this, graphene oxide (GO), carbon nanotubes (CNT), and rice husk biochar (RBC) were incorporated into an acrylic acid/2-acrylamido-2-methylpropanesulfonic acid/sodium alginate copolymer network, fabricating three carbon-composite superabsorbent polymers (GO-SAP, CNT-SAP, RBC-SAP). Systematic evaluation revealed that carbon materials dispersed uniformly within the polymer matrix via hydrogen bonding and van der Waals forces, with surface oxygen-containing groups significantly enhancing hydrophilicity. XRD and SEM analyses confirmed amorphous porous structures, with GO-SAP and RBC-SAP exhibiting superior pore distribution. Maximum swelling ratios occurred at loadings of 0.08 g (GO), 0.12 g (CNT), and 0.12 g (RBC). At equivalent loadings, GO-SAP demonstrated the highest absorption capacity, attributable to GO’s strong hydrophilicity, 2D lamellar structure, and exceptional dispersibility. All composites maintained high swelling ratios between pH 5–10 and 20–50 °C but showed sensitivity to multivalent ions. Swelling kinetics followed a pseudo-second-order model (R2 > 0.99), indicating chemically controlled absorption governed by hydrophilic groups. Remarkably, the composites retained water for > 4.5 h at 50 °C and preserved > 97% water retention after centrifugation (12,000 rpm). Cyclic stability exceeded 80% of initial swelling capacity after 6 absorption-desorption cycles. This work provides a robust foundation for developing high-performance, sustainable superabsorbents.