Jia Xin-Jian, Wang Jinshu, Wu Junshu, Teng Weili, Zhao Bingxin, Li Hongyi, Du Yucheng
Key Laboratory of Advanced Functional Materials for Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology Beijing 100124 China
RSC Adv. 2018 Jan 4;8(3):1621-1631. doi: 10.1039/c7ra11292k. eCollection 2018 Jan 2.
A novel rod-shaped MoO/CaSO composite was prepared by using hexa-ammonium molybdate and flue gas desulfurization gypsum a simple mixed-solvothermal route. In this composite, CaSO matrices are decorated with MoO nanoparticles, and non-structural mesopores are formed particle packing. Moreover, it displays an excellent adsorption capability towards anionic congo red (CR) and cationic rhodamine B (RhB). The adsorption quantities per unit mass and removal efficiencies of the two dyes are significantly influenced by adsorbent dose, solution pH, and temperature. The adsorption isotherm data can be best fitted by the Langmuir model, and the calculated maximum adsorption quantities at 303.5 K are 853.54 mg g for CR and 86.38 mg g for RhB, respectively, which are superior to other common adsorbents. The corresponding kinetic data can be well matched with the pseudo-second-order model. Additionally, the CR adsorption is an exothermic process, while the RhB adsorption is an endothermic process. Both of them are multi-step chemisorption processes influenced by surface adsorption and intra-particle diffusion. This MoO/CaSO composite can be applied as an alternative adsorbent for removing organic dyestuffs from printing and dyeing wastewater.
采用钼酸六铵和烟气脱硫石膏，通过简单的混合溶剂热法制备了一种新型棒状MoO/CaSO复合材料。在这种复合材料中，CaSO基体上装饰有MoO纳米颗粒，并且由于颗粒堆积形成了非结构性中孔。此外，它对阴离子型刚果红（CR）和阳离子型罗丹明B（RhB）表现出优异的吸附能力。两种染料的单位质量吸附量和去除效率受吸附剂剂量、溶液pH值和温度的显著影响。吸附等温线数据可以用Langmuir模型得到最佳拟合，在303.5 K下计算得到的CR和RhB的最大吸附量分别为853.54 mg/g和86.38 mg/g，优于其他常见吸附剂。相应的动力学数据可以很好地与准二级模型匹配。此外，CR吸附是一个放热过程，而RhB吸附是一个吸热过程。它们都是受表面吸附和颗粒内扩散影响的多步化学吸附过程。这种MoO/CaSO复合材料可以作为一种替代吸附剂，用于去除印染废水中的有机染料。
