One-step biosynthesis of a bilayered graphene oxide embedded bacterial nanocellulose hydrogel for versatile photothermal membrane applications
One-step biosynthesis of a bilayered graphene oxide embedded bacterial nanocellulose hydrogel for versatile photothermal membrane applications
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用于多功能光热膜应用的双层氧化石墨烯嵌入细菌纳米纤维素水凝胶的一步生物合成
DOI：
10.1039/d1en00754h
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Vikesland, Peter J.
中科院分区：
文献类型：
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作者：
Divyapriya, Govindaraj;Rahman, Asifur;Leng, Weinan;Wang, Wei;Vikesland, Peter J.
我们介绍了一种由还原氧化石墨烯（rGO）和细菌纳米纤维素（BNC）组成的双层结构水凝胶复合材料的简便一步生物合成方法，用于多种光热水处理应用。通过修改 BNC 生长培养基并补充优化浓度的玉米浆作为生长促进剂，实现了双层水凝胶的一步原位生物合成。揭示了双层结构的两阶段、生长速率控制的形成机制。最终清洁和冷冻干燥的还原 GO 嵌入 BNC 双层膜可实现多种应用，例如过滤（使用金纳米颗粒、大肠杆菌细胞和质粒 DNA 进行测试）、捕获的大肠杆菌的光热消毒和太阳能水蒸发。观察到与超滤相当的颗粒截留率（高达 约 4 nm）和水通量（146 L h−1 m−2）。大肠杆菌细胞的捕获和光热灭活在阳光照射（一个太阳）后 10 分钟内完成。这种处理可以潜在地抑制膜生物污染。蒸汽产生量为1.96 kg m−2 h−1。我们简单且可扩展的方法为环境和生物医学应用的纳米结构材料的生物合成开辟了一条新途径。
We introduce the facile one-step biosynthesis of a bilayer structured hydrogel composite of reduced-graphene oxide (rGO) and bacterial nanocellulose (BNC) for multiple photothermal water treatment applications. One-step in situ biosynthesis of a bilayered hydrogel was achieved via modification of BNC growth medium supplemented with an optimized concentration of corn steep liquor as a growth enhancer. A two-stage, growth rate-controlled formation mechanism for the bilayer structure was revealed. The final cleaned and freeze-dried reduced-GO embedded BNC bilayer membrane enables versatile applications such as filtration (tested using gold nanoparticles, Escherichia coli cells, and plasmid DNA), photothermal disinfection of entrapped E. coli, and solar water evaporation. Comparable particle rejection (up to ≈4 nm) and water flux (146 L h−1 m−2) to ultrafiltration were observed. Entrapment and photothermal inactivation of E. coli cells were accomplished within 10 min of solar exposure (one sun). Such treatment can potentially suppress membrane biofouling. The steam generation capacity was 1.96 kg m−2 h−1. Our simple and scalable approach opens a new path for biosynthesis of nanostructured materials for environmental and biomedical applications.