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Removal of sulfate from aqueous solution using Mg–Al nano-layered double hydroxides synthesized under different dual solvent systems
Nanotechnology Reviews ( IF 7.4 ) Pub Date : 2021-01-01 , DOI: 10.1515/ntrev-2021-0012
Xiaobo Liu 1 , Shuang Lu 2, 3 , Zhen Tang 2, 3 , Zhaojia Wang 4 , Tianyong Huang 4
Affiliation  

Because of its priority to remove anions, nano-layered double hydroxide (LDH) was incorporated to improve the sulfate attack corrosion resistance of cement-based materials. Herein, the synthesis of high-efficiency LDH for removal of SO 4 2 − {\text{SO}}_{4}^{2-} is necessary. In this study, LDH with different Mg/Al ratios was synthesized under different dual solvent systems (water and ethylene glycol/ethanol/tetrapropylammonium hydroxide). Based on the adsorption experimental results, the LDH synthesized with n (Mg:Al) = 2:1 under water and ethanol solvent systems (ET2.0) exhibits the best adsorption capacity. The d (003) of LDH synthesized with n (Mg:Al) = 2:1 under different dual solvent systems are 0.7844, 0.7830, and 0.7946 nm, respectively. Three LDH belong to LDH- NO 3 − {\text{NO}}_{3}^{-} . The results indicated that their surface charges show obvious difference synthesized under different dual solvent systems, which leads to differences in adsorption performance. The adsorption experimental results show that ET2.0 followed pseudo second-order kinetics and Langmuir model. The ET2.0 removed SO 4 2 − {\text{SO}}_{4}^{2-} through anion substitution and electrostatic interaction and exhibited excellent adsorption rate with the maximum adsorption capacity of 95.639 mg/g. The effects of pore solution anion (OH − , Cl − , and CO 3 2 − {\text{CO}}_{3}^{2-} ) on the removal of SO 4 2 − {\text{SO}}_{4}^{2-} by the ET2.0 are limited.

中文翻译:

使用在不同双溶剂系统下合成的Mg-Al纳米层双氢氧化物去除水溶液中的硫酸盐

由于优先去除阴离子,因此加入了纳米层双氢氧化物(LDH),以提高水泥基材料的抗硫酸盐侵蚀性。在此,需要合成用于去除SO 4 2-{\ text {SO}} _ {4} ^ {2-}的高效LDH。在这项研究中,在不同的双溶剂系统(水和乙二醇/乙醇/四丙基氢氧化铵)下合成了具有不同Mg / Al比的LDH。根据吸附实验结果,在水和乙醇溶剂体系(ET2.0)下,n(Mg:Al)= 2:1合成的LDH表现出最佳的吸附能力。在不同双溶剂体系下,n(Mg:Al)= 2:1合成的LDH的d(003)分别为0.7844、0.7830和0.7946 nm。三个LDH属于LDH- NO 3-{\ text {NO}} _ {3} ^ {-}。结果表明,在不同的双溶剂体系下,它们的表面电荷显示出明显的差异,这导致了吸附性能的差异。吸附实验结果表明,ET2.0遵循拟二级动力学和Langmuir模型。ET2.0通过阴离子取代和静电作用除去SO 4 2-{\ text {SO}} _ {4} ^ {2-},并具有优异的吸附速率,最大吸附容量为95.639 mg / g。孔溶液阴离子(OH-,Cl-和CO 3 2-{\ text {CO}} _ {3} ^ {2-})对SO 4 2-{\ text {SO}}去除的影响ET2.0的_ {4} ^ {2-}受限制。0遵循伪二级动力学和Langmuir模型。ET2.0通过阴离子取代和静电作用除去SO 4 2-{\ text {SO}} _ {4} ^ {2-},并具有优异的吸附速率,最大吸附容量为95.639 mg / g。孔溶液阴离子(OH-,Cl-和CO 3 2-{\ text {CO}} _ {3} ^ {2-})对SO 4 2-{\ text {SO}}去除的影响ET2.0的_ {4} ^ {2-}受限制。0遵循伪二级动力学和Langmuir模型。ET2.0通过阴离子取代和静电作用除去SO 4 2-{\ text {SO}} _ {4} ^ {2-},并具有优异的吸附速率,最大吸附容量为95.639 mg / g。孔溶液阴离子(OH-,Cl-和CO 3 2-{\ text {CO}} _ {3} ^ {2-})对SO 4 2-{\ text {SO}}去除的影响ET2.0的_ {4} ^ {2-}受限制。
更新日期:2021-01-01
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