Chen Shuaiqi, Wang Xuhui, Tong Weiyi, Sun Jianchuan, Xu Xiangyu, Song Jiaqing, Gong Jianyi, Chen Wei
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China.
Nanomaterials (Basel). 2021 Mar 20;11(3):799. doi: 10.3390/nano11030799.
In this study, phosphorus-modified alumina with large pore size was synthesized through a coprecipitation method. The carbon-covered, phosphorus-modified alumina with large pores was prepared by impregnating with glucose and carbonizing to further improve the adsorption of organic dyes. The morphology and structure of these composites were characterized by various analysis methods, and Rhodamine B (RhB) adsorption was also examined in aqueous media. The results showed that the specific surface area and pore size of the phosphorus-modified alumina sample AP7 (prepared with a P/Al molar ratio of 0.07) reached 496.2 m·g and 21.9 nm, while the specific surface area and pore size of the carbon-covered phosphorus-modified alumina sample CAP7-27 (prepared by using AP7 as a carrier for glucose at a glucose/Al molar ratio of 0.27) reached 435.3 m·g and 21.2 nm. The adsorption experiment of RhB revealed that CAP7-27 had not only an equilibrium adsorption capacity of 198 mg·g, but also an adsorption rate of 162.5 mg·g in 5 min. These superior adsorption effects can be attributed to the similar pore structures of CAP7-27 with those of alumina and the specific properties with those of carbon materials. Finally, the kinetic properties of these composites were also studied, which were found to be consistent with a pseudo-second-order kinetic model and Langmuir model for isothermal adsorption analysis. This study indicates that the prepared nanomaterials are expected to be promising candidates for efficient adsorption of toxic dyes.
在本研究中，通过共沉淀法合成了具有大孔径的磷改性氧化铝。通过用葡萄糖浸渍并碳化来制备具有大孔的碳包覆磷改性氧化铝，以进一步提高对有机染料的吸附性能。采用多种分析方法对这些复合材料的形貌和结构进行了表征，并在水介质中考察了罗丹明B（RhB）的吸附情况。结果表明，磷改性氧化铝样品AP7（P/Al摩尔比为0.07制备）的比表面积和孔径分别达到496.2 m·g和21.9 nm，而碳包覆磷改性氧化铝样品CAP7 - 27（以AP7为载体，葡萄糖/Al摩尔比为0.27制备）的比表面积和孔径分别达到435.3 m·g和21.2 nm。RhB的吸附实验表明，CAP7 - 27不仅平衡吸附容量为198 mg·g，而且在5分钟内的吸附速率为162.5 mg·g。这些优异的吸附效果可归因于CAP7 - 27与氧化铝相似的孔结构以及与碳材料相似的特性。最后，还研究了这些复合材料的动力学性质，发现其符合准二级动力学模型和用于等温吸附分析的朗缪尔模型。本研究表明，所制备的纳米材料有望成为高效吸附有毒染料的有前途的候选材料。
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