Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, PR China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, PR China.
J Colloid Interface Sci. 2018 Feb 15;512:853-861. doi: 10.1016/j.jcis.2017.10.092. Epub 2017 Oct 26.
Phytic acid (PA) induced graphene macrostructures were synthesized and investigated for the sorption characteristics and mechanisms of mercury. The as-synthesized graphene foam possessed large specific surface area and amphiphilicity. FTIR and XPS analysis revealed that the as-prepared graphene macrostructure retained oxygen-containing functional groups after hydrothermal reduction and also captured new phosphorus-containing groups because of the introduction of PA. Different experimental parameters, such as pH, PA fractions and contact time were applied to probe into the Hg(II) adsorption performance of as-synthesized macrostructure. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well to the obtained sorption kinetic and isothermal data. The maximum adsorption capacity at pH = 7.2 for mercury was 361.01 mg/g. The dominant mechanisms for mercury removal were mainly ion exchange and surface complexation. Real application in river water and seawater exhibited very promising results, indicating its broad prospect in water purification.
植酸（PA）诱导的石墨烯宏观结构被合成并研究了其对汞的吸附特性和机制。所合成的石墨烯泡沫具有大的比表面积和两亲性。FTIR 和 XPS 分析表明，所制备的石墨烯宏观结构在水热处理还原后保留了含氧官能团，并且由于 PA 的引入，还捕获了新的含磷基团。不同的实验参数，如 pH 值、PA 分数和接触时间，被应用于研究所合成的宏观结构对 Hg(II)的吸附性能。准二级动力学模型和 Langmuir 等温线模型很好地拟合了得到的吸附动力学和等温线数据。在 pH 值为 7.2 时，对汞的最大吸附容量为 361.01mg/g。去除汞的主要机制主要是离子交换和表面络合。在河水和海水中的实际应用显示出非常有前景的结果，表明其在水净化方面有广阔的前景。
