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From wastes to functions: preparation of layered double hydroxides from industrial waste and its removal performance towards phosphates.
Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2021-09-23 , DOI: 10.1007/s11356-021-16563-x
Liping Xiao 1 , Yan Li 2 , Qiaoping Kong 1 , Yunlong Lan 1
Affiliation  

To control eutrophication and recover phosphate from wastewater, a calcium carbide slag and red mud composite material (CR-LDH) was prepared using industrial waste as raw material for phosphorus adsorption. The morphology and structure of synthesized CR-LDH were characterized by FT-IR, SEM, EDS, and XRD measurements. Bath adsorption test results showed that the optimal dosages of adsorbent and pH for phosphate were 5 g·L-1 and pH of 7, respectively. The experimental data could be well described by pseudo-second-order kinetic and Langmuir isotherm models, suggesting that the adsorption process of CR-LDH with respect to phosphate was a chemical and monolayer process. The theoretical maximum adsorption capacity obtained by Langmuir isotherm model was 16.06 mg·g-1 at 25 °C. The intra-particle diffusion model fitting results indicated that the adsorption of phosphate by CR-LDH was controlled by both liquid membrane diffusion and intra-particle diffusion. Phosphate was bound to CR-LDH via synergistic effect of physical adsorption, ion exchange, anion intercalation, and chemical precipitation as evidenced from a combination of microscopic analysis and adsorption mechanism study. The actual phosphate-containing wastewater investigation showed that CR-LDH not only exhibited good removal effect on phosphate, but also could greatly reduce turbidity, COD, and ammonia nitrogen, which was suitable for disposal of practical wastewater. The COD, turbidity, and NH4+-N could be reduced by 42.39%, 77.20%, and 20.71%, respectively. These results indicate that CR-LDH can be considered as potential adsorbent for the treatment of phosphate-containing wastewater, which will be helpful to achieve the goal of "treating waste with waste and turning waste into treasure".

中文翻译:

从废物到功能:从工业废物中制备层状双氢氧化物及其对磷酸盐的去除性能。

为控制富营养化,回收废水中的磷酸盐,以工业废弃物为原料,制备了电石渣赤泥复合材料(CR-LDH)吸附磷。通过FT-IR、SEM、EDS和XRD测量对合成的CR-LDH的形貌和结构进行了表征。浴吸附试验结果表明,磷酸盐的最佳吸附剂用量和pH值分别为5 g·L-1和pH值7。实验数据可以通过准二级动力学和Langmuir等温线模型很好地描述,表明CR-LDH对磷酸盐的吸附过程是化学和单分子层过程。Langmuir等温线模型得到的理论最大吸附容量为16.06 mg·g-1,温度为25 ℃。颗粒内扩散模型拟合结果表明,CR-LDH对磷酸盐的吸附受液膜扩散和颗粒内扩散的控制。微观分析和吸附机理研究相结合,证明磷酸盐通过物理吸附、离子交换、阴离子插层和化学沉淀的协同作用与 CR-LDH 结合。对含磷废水的实际调查表明,CR-LDH不仅对磷酸盐有很好的去除效果,而且可以大幅度降低浊度、COD和氨氮,适合于实际废水的处理。COD、浊度和NH4+-N可分别降低42.39%、77.20%和20.71%。
更新日期:2021-09-23
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