Maiti Moumita, Sarkar Manas, Malik Muhammad Akbar, Xu Shilang, Li Qinghua, Mandal Saroj
Department of Physics and Department of Civil Engineering, Jadavpur University, Kolkata70032, India.
Institute of Advanced Engineering Structures and Materials, Zhejiang University, Hangzhou 310058, China.
ACS Omega. 2018 Jan 26;3(1):1081-1089. doi: 10.1021/acsomega.7b01545. eCollection 2018 Jan 31.
Due to the growing population, drought, and the contamination of conventional water sources, the need for clean water is rising worldwide with high demand. The application of nanomaterials for water purification can provide a better water quality, by eliminating toxic metals and also decomposing organic contaminants. Exploitation of industrial coal-burned byproduct, fly ash, through nanomodification has been developed in this exertion for the treatment of wastewater along with heavy-metal remediation and dye degradation. The fly ash was sintered at 1000 °C with addition of hydrothermally synthesized iron oxide nanoparticles to make a cementitious composite (FA10C) using an alkali activator (NaOH + NaSiO) at ambient temperature. Chemical investigations of the fly ash and the FA10C composites were done by X-ray fluorescence techniques. Analysis of FA10C by X-ray diffraction, Fourier transform infrared, field emission scanning electron microscopy, energy-dispersive spectrometry, and dynamic thermal analysis/thermogravimetric techniques revealed that nanodimensioned rod-shaped mullite formation and its interlocking textures enhance the strength of the building composite. Furthermore, the cementitious composite (FA10C) has been used as an adsorbent to remove heavy metals (lead, chromium, cadmium, copper) and carcinogenic dyes (methylene blue, Congo red, and acid red-1) from their aqueous solutions. The mineralogical features of the composite FA10C and its adsorption capacities/efficiencies were studied by systematic investigation of different parameters, and the adsorption data have been analyzed using Langmuir isotherm. The experimental findings suggest that the iron oxide nanoparticles facilitated fly ash can be implemented as a substitute cementitious composite (greenhouse effect) in construction technology being an energy-saving, low cost, and eco-friendly process in adsorbent manufacturing.
由于人口增长、干旱以及传统水源的污染，全球对清洁水的需求正急剧上升。纳米材料在水净化中的应用可以通过去除有毒金属和分解有机污染物来提供更好的水质。在这项工作中，已开发出通过纳米改性利用工业燃煤副产品粉煤灰来处理废水，同时进行重金属修复和染料降解。将粉煤灰在1000℃下烧结，并添加水热合成的氧化铁纳米颗粒，在室温下使用碱活化剂（NaOH + NaSiO）制成水泥基复合材料（FA10C）。通过X射线荧光技术对粉煤灰和FA10C复合材料进行了化学研究。通过X射线衍射、傅里叶变换红外光谱、场发射扫描电子显微镜、能量色散光谱以及动态热分析/热重技术对FA10C进行分析，结果表明纳米尺寸的棒状莫来石的形成及其互锁结构增强了建筑复合材料的强度。此外，水泥基复合材料（FA10C）已被用作吸附剂，用于从水溶液中去除重金属（铅、铬、镉、铜）和致癌染料（亚甲基蓝、刚果红和酸性红-1）。通过对不同参数的系统研究，研究了复合材料FA10C的矿物学特征及其吸附容量/效率，并使用朗缪尔等温线对吸附数据进行了分析。实验结果表明，氧化铁纳米颗粒促进的粉煤灰可以作为替代水泥基复合材料（温室效应）应用于建筑技术中，这是一种在吸附剂制造中节能、低成本且环保的工艺。
