Modified sodium dodecyl benzene sulfonate Mg–Al and Zn–Al layered double hydroxides (abbreviated as Mg–Al–SDBS and Zn–Al–SDBS LDHs) were synthesized and characterized by FT-IR, TGA, XRD, BET and SEM. SEM images confirmed the platelike morphology for the synthesized LDHs, with a thickness of < 100 nm for the Mg–Al and Zn–Al LDHs modified by sodium dodecyl benzene sulfonate. This modification enhanced the abilities of Mg–Al and Zn–Al layered double hydroxides to uptake efficaciously nonionic pollutant diazinon from contaminated water solutions. The parameters affecting the extraction procedure including pH of the aqueous solution, amount of the adsorbent and adsorption time were optimized by applying the statistical technique response surface methodology. Desorption of the loaded diazinon was performed by applying acetonitrile as diluent. HPLC was used for measuring the concentration of diazinon. Under optimal conditions, the uptake capacity of diazinon and its removal percentage with Mg–Al–SDBS (26.5 mg g⁻¹, ~ 75%) were found to be higher than Zn–Al–SDBS (22.4 mg g⁻¹, ~ 57%). The former LDH allowed also achieving to a higher concentration factor with respect to that provided by Zn–Al–SDBS (8 vs. 3.2). It was demonstrated that the adsorption isotherms of diazinon onto both of the studied modified LDHs obeyed from Langmuir model. Intra-particle diffusion model was suitable for interpretation of the adsorption kinetics. The proposed adsorption procedures by the investigated modified LDHs were used successfully for decontamination of water samples from diazinon. The inter- and intra-day relative standard deviations for the samples (n = 3) were found to be 5.2% and 6.7%, respectively.

中文翻译：

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用十二烷基苯磺酸钠改性的Mg-Al和Zn-Al层状双氢氧化物作为固体吸附剂从水中去除二嗪农

合成了十二烷基苯磺酸钠修饰的Mg-Al和Zn-Al层状双氢氧化物（缩写为Mg-Al-SDBS和Zn-Al-SDBS LDHs），并通过FT-IR，TGA，XRD，BET和SEM进行了表征。SEM图像证实了合成的LDH的板状形态，经十二烷基苯磺酸钠改性的Mg-Al和Zn-Al LDH的厚度小于100 nm。这种修饰增强了Mg-Al和Zn-Al层状双氢氧化物从受污染的水溶液中有效吸收非离子污染物二嗪农的能力。通过应用统计技术响应面方法，优化了影响萃取过程的参数，包括水溶液的pH，吸附剂的量和吸附时间。通过施加乙腈作为稀释剂进行负载的二嗪农的解吸。HPLC用于测量二嗪农的浓度。在最佳条件下，二嗪农的吸收能力及其对Mg–Al–SDBS（26.5 mg g^-1（〜75％）被发现高于Zn-Al-SDBS（22.4 mg g ^-1，〜57％）。相对于Zn-Al-SDBS提供的浓度因子，前LDH还可以实现更高的浓度因子（8 vs. 3.2）。结果表明，对二嗪农的吸附等温线在Langmuir模型中均服从于两种研究的改性LDH上。颗粒内扩散模型适用于解释吸附动力学。所研究的改性LDH所建议的吸附程序已成功用于去污二嗪农中的水样。样品（n  = 3）的日间和日内相对标准偏差分别为5.2％和6.7％。