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首页> 外文期刊>RSC Advances >Sodium dodecylsulfate-layered double hydroxide and its use in the adsorption of 17β-estradiol in wastewater
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Sodium dodecylsulfate-layered double hydroxide and its use in the adsorption of 17β-estradiol in wastewater

机译：十二烷基硫酸钠层状双氢氧化物及其在废水中17β-雌二醇的吸附中

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Modified Mg _(3) Al layered double hydroxide (LDH) intercalated with dodecylsulfate anion composites, which were designated as SDS-LDH composites, were synthesized by coprecipitation. The samples were characterized using SEM, EDX, FT-IR, zeta potential analysis, and XRD. The results showed that the SDS-LDH composites contain a thicker and larger porous interconnected network than inorganic LDH due to the enlarged inter-layer distance. The outstanding adsorption performance of SDS-LDH composites toward 17β-estradiol (E2) was investigated under different conditions, including solution pH, adsorbent dosage, ion strength, reaction time, and temperature. When the solution pH was 7 and the adsorbent dosage was 2 g L ~(?1) , the removal rate of E2 reached the maximum at 94%, whereas inorganic LDH displayed a poor E2 removal rate of 10%. The presence of various ions (Na ~(+) , SO _(4) ~(2?) , CI ~(?) , and H _(2) PO _(4) ~(?) ) in aqueous solution exerted no significant adverse effects on the adsorption process. The adsorption equilibrium was reached within 20 min, and the adsorption fitted well with the pseudo-second-order model and the Freundlich isotherm. The thermodynamic test revealed that the adsorption process was spontaneous and endothermic. Phosphorus was selected as the index for evaluating the adsorption capacity of SDS-LDH composites for inorganic ions. The removal rates of total phosphorus and PO _(4) ~(3?) were 43.71% and 55.93% for SDS-LDH composites at 2 g L ~(?1) . The removal rate of PO _(4) ~(3?) reached up to 85% when the contact time was 120 min and the dosage was 3 g L ~(?1) for SDS-LDH composites, which were approximately close to those of inorganic LDH of 30 min and 2 g L ~(?1) , respectively. This finding indicates that the removal capacity of SDS-LDH composites for PO _(4) ~(3?) decreased after the dodecylsulfate anions intercalated into the interlayer. The composites retained their high efficiency and stability after desorption and regeneration with alkali treatment. This study demonstrated that SDS-LDH composites are a promising adsorbent for the recovery and abatement of trace-level E2 in secondary effluents of wastewater treatment plants.
机译：通过共沉淀法合成了插入有十二烷基硫酸盐阴离子复合材料的改性Mg_（3）Al层状双氢氧化物（LDH）。使用SEM，EDX，FT-IR，ζ电位分析和XRD对样品进行表征。结果表明，由于增大了层间距离，SDS-LDH复合材料比无机LDH具有更厚，更大的多孔互连网络。研究了SDS-LDH复合材料在溶液pH，吸附剂用量，离子强度，反应时间和温度等不同条件下对17β-雌二醇（E2）的优异吸附性能。当溶液的pH值为7，吸附剂量为2 g L〜（？1）时，E2的去除率达到最大值，为94％，而无机LDH的E2去除率却很差，为10％。水溶液中各种离子（Na〜（+），SO _（4）〜（2？），CI〜（？）和H _（2）PO _（4）〜（？）的存在均没有作用。对吸附过程有明显的不利影响。在20分钟内达到吸附平衡，并且吸附与拟二阶模型和Freundlich等温线拟合得很好。热力学测试表明吸附过程是自发的并且是吸热的。选择磷作为评价SDS-LDH复合材料对无机离子的吸附能力的指标。在2 g L〜（？1）下，SDS-LDH复合材料的总磷和PO _（4）〜（3？）的去除率分别为43.71％和55.93％。 SDS-LDH复合材料的接触时间为120 min，投加量为3 g L〜（？1）时，PO _（4）〜（3？）的去除率达到85％。分别为30分钟和2 g L〜（？1）。这一发现表明，十二烷基硫酸盐阴离子插入中间层后，SDS-LDH复合材料对PO _（4）〜（3？）的去除能力降低。经过碱处理的脱附和再生后，复合材料仍保持其高效和稳定性。这项研究表明，SDS-LDH复合材料是一种有前途的吸附剂，可以回收和减少废水处理厂二次废水中的痕量E2。

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