Adsorption of fluoride from aqueous solution by fly ash cenospheres modified with paper mill lime mud: Experimental and modeling
Adsorption of fluoride from aqueous solution by fly ash cenospheres modified with paper mill lime mud: Experimental and modeling
复制标题
用造纸厂石灰泥改性的粉煤灰微珠吸附水溶液中的氟化物：实验和建模
DOI：
10.1016/j.ecoenv.2019.04.086
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发表时间：
2019
影响因子：
6.8
通讯作者：
Guo Liu
中科院分区：
文献类型：
--
作者：
Changwen Ye;Yan Bowen;Ji Xing;Bing Liao;Rui Gong;Xiangjun Pei;Guo Liu
以造纸厂石灰泥（LM）改性的粉煤灰微珠（FAC）为复合吸附剂，通过吸附去除水溶液中的氟化物。通过扫描电子能谱（SEM）、能量色散谱仪（EDS）、布鲁诺埃美特特勒（BET）和傅里叶变换红外（FTIR）对FAC和复合吸附剂进行表征，表明复合吸附剂经过表面改性后获得了多孔结构。改性粉煤灰微珠对氟化物的吸附采用准二阶模型和Langmuir模型进行拟合。采用响应面法（RSM）研究F-浓度、pH、吸附剂用量和温度对去除效率的影响。方差分析（ANOVA）用于测试数学模型的充分性。采用广义复合法建立了改性粉煤灰微珠吸附氟化物的非静电模型，表明在吸附过程中通过配体交换和表面络合形成了两种内球配合物：≡SF和≡SOHF - 。吸附条件的优化实现了氟化物污染水的实际需求。 • 制备了一种用造纸厂石灰泥吸附剂改性的低成本飞灰空珠。 • 采用响应面法来研究对氟化物去除的影响。 • 非静电模型-广义复合方法已成功描述和预测吸附过程。 • 通过配体交换和表面络合作用去除氟化物时形成 ≡SF 和 ≡SOHF − 。
Fluoride removal from aqueous solution by adsorption using fly ash cenospheres (FAC) modified with paper mill lime mud (LM) as composite adsorbent had been investigated. The characterization of FAC and composite adsorbent were analyzed by Scanning electron spectroscope (SEM), Energy dispersive spectrometer (EDS), Brunauer emmett teller (BET) and Fourier transform infrared (FTIR), which demonstrated that the porous structure of composite adsorbent was obtained after surface modification. Adsorption of fluoride on modified fly ash cenospheres was fitted with pseudo-second-order model and Langmuir model. Response surface methodology (RSM) was employed to investigate the effects of F − concentration, pH, adsorbent dosage and temperature on the removal efficiency. Analysis of variance (ANOVA) was used to test the adequacy of the mathematical models. The Nonelectrostatic model of modified fly ash cenospheres adsorbing fluoride was built through the Generalized composite method, indicating that two inner-spherical complexes, ≡SF and ≡SOHF − , were formed in the adsorption process by means of the ligand exchange and surface complexation. Optimization of the adsorption conditions enabled the realization of the practical needs for fluoride contaminated water. • A low-cost fly ash cenospheres modified with paper mill lime mud adsorbent was prepared. • Response surface methodology was employed to research the effects on fluoride removal. • Nonelectrostatic model-Generalized composite approach had successfully described and predicted the adsorption process. • ≡SF and ≡SOHF − formed in the removal of fluoride via the ligand exchange and surface complexation.