Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
Chemosphere. 2023 Nov;340:139915. doi: 10.1016/j.chemosphere.2023.139915. Epub 2023 Aug 24.
Protein, calcium carbonate, and chitin are abundant in shrimp shells. In this study, chemical treatment followed by hydrothermal carbonization was used to synthesize the nitrogen-rich hydrochar (HSHC) from shrimp shells. The untreated hydrochar exhibited a higher amount of calcium (25.37%) and less amount of nitrogen (2.68%) with alkaline pH (9.1). Interestingly chemical pre-treatment on shrimp shells boosted the nitrogen content to 6.81% and eliminated the calcium while controlling the pH to 6.4, which was beneficial for oxo-vanadate removal. The HSHC achieved vanadium(V) adsorption capacity of 21.20 mg/g at an optimal solution pH of 3.0, whereas the pristine hydrochar performed poorly (0.66 mg/g). The abundance of oxygen and nitrogen-based functional groups that developed through the chemical treatment resulted in improved adsorption coupled reduction performance of HSHC. This study proposed an inexpensive and environmentally friendly method for converting waste shrimp shells into value-added adsorbent.
虾壳中富含蛋白质、碳酸钙和几丁质。在这项研究中，采用化学处理后水热碳化的方法，由虾壳合成富氮水热炭（HSHC）。未经处理的水热炭具有较高的钙含量（25.37%）和较低的氮含量（2.68%），碱性 pH 值为 9.1。有趣的是，虾壳的化学预处理提高了氮含量至 6.81%，同时去除了钙，且控制 pH 值在 6.4，这有利于氧化钒的去除。在最佳溶液 pH 值为 3.0 时，HSHC 实现了 21.20 mg/g 的钒（V）吸附容量，而原始水热炭的性能较差（0.66 mg/g）。通过化学处理形成的丰富的含氧和含氮官能团，提高了 HSHC 的吸附耦合还原性能。本研究提出了一种将废弃虾壳转化为增值吸附剂的廉价且环保的方法。
