School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, PR China.
School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei, 230009, PR China.
Chemosphere. 2022 Jan;287(Pt 1):132025. doi: 10.1016/j.chemosphere.2021.132025. Epub 2021 Aug 26.
Novel three-dimensional hierarchical α-calcium sulfate hemihydrate with a straw-sheaf morphology (3D α-HH straw-sheaves) are synthesized successfully in glycerin aqueous solution by a simple one-pot method, using as an efficient adsorbent for Pb removal from water. The 3D straw-sheaf morphology, that closely depends on the glycerin/water volume ratio (V/V), can be accurately fabricated only when V/V is not lower than 3/1. 3D α-HH straw-sheaves are generated via multistep-splitting growth coupled with self-assembly. The obtained 3D α-HH straw-sheaves are further used as an adsorbent to remove Pb from water, exhibiting excellent Pb removal performance with an equilibrium adsorption capacity of 79.19 mgg and removal efficiency of 98.98%, that both higher than those of plate- and columnar-like α-HH. Moreover, the experimental adsorption data for the 3D α-HH straw-sheaves is well fitted with pseudo-second-order kinetic model, and the adsorption isotherm is in good agreement with Langmuir model. The Pb adsorption mechanism is thought to be a chemical adsorption process enforced by chemical bonding and ion exchange. This work demonstrates that 3D α-HH straw-sheaves are highly promising in removing Pb from wastewater, thereby broadening the research field for the practical application of gypsum-based materials.
新型三维分层α-半水硫酸钙具有秸秆束形态（3D α-HH 秸秆束），通过甘油水溶液中的简单一锅法成功合成，是一种从水中去除 Pb 的有效吸附剂。3D 秸秆束形态与甘油/水体积比（V/V）密切相关，仅当 V/V 不低于 3/1 时才能精确制造。3D α-HH 秸秆束是通过多步分裂生长与自组装生成的。所得的 3D α-HH 秸秆束进一步用作吸附剂从水中去除 Pb，具有优异的 Pb 去除性能，平衡吸附容量为 79.19 mgg，去除效率为 98.98%，均高于板状和柱状 α-HH。此外，3D α-HH 秸秆束的实验吸附数据很好地符合拟二级动力学模型，吸附等温线与 Langmuir 模型吻合良好。Pb 的吸附机理被认为是一种化学吸附过程，由化学键合和离子交换加强。这项工作表明 3D α-HH 秸秆束在去除废水中的 Pb 方面具有广阔的应用前景，从而拓宽了石膏基材料实际应用的研究领域。
