Optimization of the Fabrication of Sustainable Ceramsite Adsorbent from Coal Fly Ash/Waterworks Sludge/Waste Glass for Decolorization of Malachite Green

Weicheng Fang, Xingxing Cheng, Chang-Jung Sun, Hongfei Xiao, Jing Wang
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Abstract

As a traditional dye, malachite green (MG) poses a threat to our environment and health. To decolorize MG, a composite ceramsite adsorbent composed of coal fly ash (CFA), sewage treatment sludge (STS), and waste glass (WG) with a quality ratio of 3 : 3 : 4, respectively, was prepared. The optimal preparation parameters were determined as follows: preheating temperature = 600 ° C , sintering temperature = 1157 ° C , and sintering time = 17   min . Under optimal conditions, scanning electron microscopy (SEM) images show that the X-Com-ceramsite sample exhibits rough features and a porous structure. The obtained X-Com-ceramsite has a good MG decolorization effect (92% decolorization rate with an initial MG concentration of 56.876 mg/L). The q max value of MG can reach up to 37.6 mg/g. The retention degree of MG in the X-Com-ceramsite with a relatively higher pH is stronger, and the adsorption process is spontaneous and endothermic. Synchronous fluorescence, two-dimensional correlation spectroscopy (2D-COS), and Fourier transform infrared spectroscopy (FT-IR) proved that the sensitivity of the C-O/C-O-O functional groups of the carbohydrates on the surface of the X-Com-ceramsite has a higher binding affinity toward MG as the initial concentration of MG changes.
粉煤灰/水厂污泥/废玻璃可持续陶粒吸附剂对孔雀石绿脱色的优化制备
孔雀石绿作为一种传统染料,对我们的环境和健康构成了威胁。为脱色MG,制备了由粉煤灰(CFA)、污水处理污泥(STS)和废玻璃(WG)组成的复合陶粒吸附剂,质量比分别为3:3:4。确定了最佳制备参数:预热温度600℃,烧结温度1157℃,烧结时间17 min。在最佳条件下,扫描电子显微镜(SEM)图像显示x - com -陶粒样品具有粗糙的特征和多孔结构。所制得的x - com陶粒具有良好的MG脱色效果,初始MG浓度为56.876 MG /L,脱色率达92%。MG的q最大值可达37.6 MG /g。MG在pH相对较高的x - com陶粒中的保留程度较强,吸附过程为自发吸热吸附。同步荧光、二维相关光谱(2D-COS)和傅里叶变换红外光谱(FT-IR)证明,随着MG初始浓度的变化,x - com -陶粒表面碳水化合物的C-O/C-O- o官能团对MG的结合亲和力更高。
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