Jakóbik-Kolon Agata, Milewski Andrzej, Zdybał Dominik, Mitko Krzysztof, Laskowska Ewa, Mielańczyk Anna, Bok-Badura Joanna
Faculty of Chemistry, Silesian University of Technology, Krzywoustego 6, 44-100 Gliwice, Poland.
Materials (Basel). 2017 Jul 6;10(7):755. doi: 10.3390/ma10070755.
The new one-pot hydrolysis-crosslinking reaction was used to synthesize a new, waste poly(methyl methacrylate) (PMMA)-based material for zinc(II) ions removal. The alkaline hydrolysis of PMMA in diethylene glycol diethyl ether was used to obtain polymer matrix and it was then crosslinked with Ca and Mg ions to obtain the sorbent. As a result, the macroporous materials were obtained with a yield of 87% when waste PMMA was used, and about 95% when the commercial PMMAs were used. The degree of hydrolysis was similar, from 32% to 35%. New materials were then tested for their affinity towards zinc(II) ions. Two kinetic models (pseudo-first and pseudo-second order), as well as two isotherms (Langmuir and Freundlich), were used to describe the kinetics and equilibrium of zinc(II) ion sorption on the studied materials, respectively. All the prepared PMMA-based sorbents showed similar or higher sorption capacity (q up to 87.7 mg/g) compared to commercially available materials in a broad pH range (4-7). The study shows sorption was fast-above 80% of equilibrium capacity was achieved after ca. 0.5 h. Presented results show that waste PMMA may be an interesting raw material for the preparation of sorbents for zinc(II) ions removal.
采用新型的一锅法水解交联反应合成了一种新型的、基于废弃聚甲基丙烯酸甲酯（PMMA）的用于去除锌（II）离子的材料。利用PMMA在二甘醇二乙醚中的碱性水解反应来制备聚合物基体，然后使其与钙和镁离子交联以获得吸附剂。结果表明，使用废弃PMMA时，大孔材料的产率为87%，而使用商业PMMA时产率约为95%。水解度相似，在32%至35%之间。然后对新材料对锌（II）离子的亲和力进行了测试。分别使用两种动力学模型（伪一级和伪二级动力学模型）以及两种等温线模型（朗缪尔等温线和弗伦德里希等温线）来描述锌（II）离子在研究材料上的吸附动力学和吸附平衡。在较宽的pH范围（4 - 7）内，所有制备的基于PMMA的吸附剂与市售材料相比，表现出相似或更高的吸附容量（q高达87.7 mg/g）。研究表明吸附速度很快——约0.5小时后即可达到平衡容量的80%以上。所呈现的结果表明，废弃PMMA可能是制备用于去除锌（II）离子的吸附剂的一种有趣的原材料。
