The utilization of volcanic ash and shrimp shell waste into composite material is very interesting to discuss as a strategy to make naturally available materials into valuable, stable and low cost adsorbent. The study is aimed to fabricate the silica-based chitosan biocomposite material from volcanic ash of Sinabung mountain and shrimp husk by sol gel method to be used as an adsorbent. The procedure is performed by converting volcanic ash into silica salt, extracting the chitosan from shrimp skeleton, and the synthesis of the silica-chitosan biocomposite by mixing the silica with chitosan in the aid of bifunctional glutaraldehyde cross-linking agent. The silica-based chitosan composite is successfully prepared from the mixture of 20 mL 58% (v/v) Na₂SiO₃ with 2% (w/v) chitosan to obtain biocomposite material (SChC1). A rapid and simple method to bind the silica with chitosan is achieved. The resulting biocomposite is amorphous, in the form of small crystals, a rough surface with a large pore area between 2θ = 20-24°. Adsorption capacity of the biocomposite material has been evaluated, where it has the capability to bind cadmium ion due to the presence of amine group in the material surface. The prepared material of silica-chitosan biocomposite has the potential to be used as an adsorbent.

中文翻译：

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溶胶-凝胶法从火山灰和虾壳制备二氧化硅基壳聚糖生物复合材料吸附镉（II）离子

将火山灰和虾壳废料用作复合材料非常有趣，可以作为将天然材料制成有价值，稳定和低成本吸附剂的策略进行讨论。这项研究旨在通过溶胶凝胶法从锡那邦山的火山灰和虾壳制备二氧化硅基壳聚糖生物复合材料，以用作吸附剂。通过将火山灰转化成二氧化硅盐，从虾骨架中提取壳聚糖，并通过在双官能戊二醛交联剂的帮助下将二氧化硅与壳聚糖混合来合成二氧化硅-壳聚糖生物复合物，从而进行该过程。由20 mL 58％（v / v）Na ₂ SiO ₃的混合物成功制备了二氧化硅基壳聚糖复合材料用2％（w / v）的壳聚糖制得生物复合材料（SChC1）。实现了将二氧化硅与壳聚糖结合的快速简单的方法。所得的生物复合材料为非晶态，呈小晶体形式，具有在2θ= 20-24°之间具有较大孔面积的粗糙表面。已经评估了生物复合材料的吸附能力，其中由于材料表面中存在胺基，其具有结合镉离子的能力。所制备的二氧化硅-壳聚糖生物复合材料具有用作吸附剂的潜力。