Yang Xiuzhen, Zhou Bin, Wang Changye, Tan Ronghao, Cheng Shuangchan, Saleem Atif, Zhang Yuezhou
College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
3RD Construction CO. LTD of China Construction 5th Engineering Bureau Changsha, Changsha 410004, China.
ACS Omega. 2023 Jul 20;8(30):26916-26925. doi: 10.1021/acsomega.3c01735. eCollection 2023 Aug 1.
Contamination of water sources by toxic antimony Sb(III) ions poses a threat to clean water supplies. In this regard, we have prepared a mesoporous silica nanoparticle (MSN)-derived adsorbent by reverse microemulsion polymerization, using cetyltrimethylammonium chloride (CTAC) and triethanolamine (TEA) as co-templates. The physical and chemical properties were characterized using advanced tools. The MSN exhibits a higher surface area of up to 713.72 m·g, a pore volume of 1.02 cm·g, and a well-ordered mesoporous nanostructure with an average pore size of 4.02 nm. The MSN has a high adsorption capacity for toxic Sb(III) of 27.96 mg·g at pH 6.0 and 298 K. The adsorption data followed the Langmuir isotherm, while the kinetics of adsorption followed the pseudo-second-order model. Interestingly, the effect of coexisting iron showed a promoting effect on Sb(III) uptake, while the presence of manganese slightly inhibited the adsorption process. The recyclability of the MSN adsorbent was achieved using a 0.5 M HCl eluent and reused consecutively for three cycles with a more than 50% removal efficiency. Moreover, the characterization data and batch adsorption study indicated physical adsorption of Sb(III) by mesopores and chemical adsorption due to silicon hydroxyl groups.
有毒的锑（III）离子对水源的污染对清洁供水构成威胁。在这方面，我们通过反相微乳液聚合制备了一种介孔二氧化硅纳米颗粒（MSN）衍生的吸附剂，使用十六烷基三甲基氯化铵（CTAC）和三乙醇胺（TEA）作为共模板。使用先进工具对其物理和化学性质进行了表征。该MSN的比表面积高达713.72 m²·g，孔体积为1.02 cm³·g，具有有序的介孔纳米结构，平均孔径为4.02 nm。在pH 6.0和298 K条件下，该MSN对有毒锑（III）的吸附容量高达27.96 mg·g。吸附数据符合Langmuir等温线，而吸附动力学符合准二级模型。有趣的是，共存铁的影响对锑（III）的吸附有促进作用，而锰的存在则略微抑制了吸附过程。使用0.5 M HCl洗脱剂实现了MSN吸附剂的可回收性，并连续重复使用三个循环，去除效率超过50%。此外，表征数据和批量吸附研究表明，锑（III）通过介孔进行物理吸附，同时由于硅羟基存在化学吸附。
