National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, People's Republic of China.
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, People's Republic of China.
Environ Technol. 2021 Apr;42(11):1642-1651. doi: 10.1080/09593330.2019.1675774. Epub 2019 Oct 12.
Low-cost lignite-based, copper-containing adsorbents (Cu-raw) were developed through a simple ultrasonic impregnation protocol for enhanced adsorption of direct yellow brown D3G (DYB) from aqueous solutions while treating copper-containing wastewater. The adsorbent was characterized by X-ray diffraction (XRD), scanning electron microscopy-energy dispersion spectroscopy (SEM-EDS), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The adsorption isotherms and kinetics were studied, and the factors that affect the adsorption, such as adsorbent dosage and solution pH, were investigated. The results showed that DYB adsorption was highly pH dependent and the isotherm of adsorption could be well described by the Langmuir-Freundlich model and the maximum DYB adsorption capacity was estimated to be 369 mg/g at 25°C. The electrostatic and chelating interactions were the main interfacial interaction mechanism, and the synergetic removal performance of lignite toward cationic metal ions and anionic dye was shown. The kinetic data were well fitted to the pseudo-second-order equation, indicating that chemical sorption was the rate-limiting step. The findings reported in this work highlight the potential of using lignite as an effective low-cost adsorbent for the removal of organic pollutants from wastewater.
通过简单的超声浸渍法制备了一种基于廉价褐煤、含铜的吸附剂（Cu-raw），用于从水溶液中增强吸附直接黄棕 D3G（DYB），同时处理含铜废水。通过 X 射线衍射（XRD）、扫描电子显微镜-能量色散光谱（SEM-EDS）、傅里叶变换红外（FT-IR）光谱和 X 射线光电子能谱（XPS）对吸附剂进行了表征。研究了吸附等温线和动力学，考察了影响吸附的因素，如吸附剂用量和溶液 pH 值。结果表明，DYB 的吸附高度依赖于 pH 值，吸附等温线可以很好地用朗缪尔-弗伦德利希模型来描述，在 25°C 时，最大 DYB 吸附容量估计为 369mg/g。静电和螯合相互作用是主要的界面相互作用机制，褐煤对阳离子金属离子和阴离子染料表现出协同去除性能。动力学数据很好地符合拟二级方程，表明化学吸附是限速步骤。本工作的研究结果突出了褐煤作为一种从废水中去除有机污染物的有效、低成本吸附剂的潜力。
