View largeDownload slide

View largeDownload slide

Close modal

Point-of-use (POU) drinking water treatment is crucial for residents in resource-constrained areas. This study introduces a layered double hydroxide (LDH) foil, an innovative POU device that eliminates waterborne pathogens via adsorption. It is an aluminum foil coated with magnesium–aluminum (Mg–Al)-type LDH, a recognized human-safe pathogen adsorbent. Its sheet-like morphology enables easy retrieval of inherently powdered LDH from post-disinfected water. Coating with Mg–Al LDH foils was accomplished by immersing aluminum foils in alkaline magnesium solutions, resulting in the on-surface formation of LDH. Using 12 distinct alkaline magnesium solutions, 12 types of LDH foils were prepared. Most LDH foils demonstrated >99% removal of Escherichia coli (DH5α strain) within 3–24 h when 100 mL of water was inoculated with DH5α at approximately 10³ colony-forming units (CFU)/mL agitated with a 25-cm² LDH foil piece. The LDH foil with the highest efficacy had a maximum adsorption capacity of approximately 1.3 × 10⁶ CFU per 1-cm² LDH foil. Furthermore, the LDH foil was regenerated by submersing it in the alkaline solution during its preparation, enabling multiple reuses. Owing to its straightforward production and application, the LDH foil holds substantial promise as a convenient-to-use adsorbent for batch water disinfection, such as jug water, in rural households.

查看大图下载幻灯片

查看大图下载幻灯片

关闭模式

使用点 (POU) 饮用水处理对于资源有限地区的居民至关重要。本研究引入了层状双氢氧化物 (LDH) 箔，这是一种创新的 POU 装置，可通过吸附消除水传播的病原体。它是一种涂有镁铝（Mg-Al）型LDH的铝箔，这是一种公认​​的对人体安全的病原体吸附剂。其片状形态可以轻松地从消毒后的水中回收本来呈粉末状的 LDH。通过将铝箔浸入碱性镁溶液中，在表面形成 LDH，从而完成 Mg-Al LDH 箔的涂层。使用 12 种不同的碱性镁溶液，制备了 12 种类型的 LDH 箔。当以约 10 ^{3菌落形成单位 (CFU)/mL}的 DH5 α接种100 mL 水并用 25 cm 搅拌时，大多数 LDH 箔片在 3-24 小时内可去除 99% 以上的大肠杆菌（DH5 α 菌株） ² LDH 箔片。具有最高功效的LDH箔具有每1-cm ² LDH箔约1.3×10 ⁶ CFU的最大吸附容量。此外，LDH箔在制备过程中通过将其浸入碱性溶液中进行再生，从而可以多次重复使用。由于其生产和应用简单，LDH 箔有望作为一种方便使用的吸附剂，用于农村家庭的批量水消毒，例如水壶水。