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以镍、镁、铝的硝酸盐和尿素为原料，利用水热法制备了具有良好吸附性能的镍镁铝类水滑石（NiMgAl-LDHs），并研究了其对甲基橙的吸附性能。通过X-射线衍射仪（XRD）、扫描电镜（SEM）、透射电镜（TEM）和傅里叶红外光谱（FT-IR）等手段表征分析了材料的结构，并探究了时间、温度、投加量、溶液浓度和pH对材料吸附性能的影响，最后研究了NiMgAl-LDHs吸附甲基橙的动力学和热力学。结果表明：实验所制备的NiMgAl-LDHs尺寸均匀，结晶度高，比表面积为84.983 m2/g；酸性条件更有利于材料吸附甲基橙，当pH值为3.0，吸附剂用量为10 mg，吸附时间为45 min时，NiMgAl-LDHs对50 mL浓度为40 mg/L的甲基橙溶液的去除率为99.0%，吸附过程更符合准二级动力学模型，用Langmuir模型能更好地对吸附热力学过程进行描述，最大吸附容量为250 mg/g。因此，本文制备的NiMgAl-LDHs能够高效、快速吸附去除甲基橙，在处理印染废水方面具有一定潜力。
Abstract：NiMgAl layered double hydroxide(NiMgAl-LDHs) with satisfactory absorption has been synthesized by hydrothermal method, using nitrates of nickel, magnesium and aluminum and urea as raw materials, whose adsorption properties for methyl orange are studied. The structure of NiMgAl-LDHs is characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and Fourier transform infrared spectroscopy(FT-IR). The effects of time, temperature,dosage, solution concentration and pH on the adsorption properties of NiMgAl-LDHs are investigated. Moreover,the kinetics and thermodynamics of NiMgAl-LDHs adsorption for methyl orange are studied. The results show that: NiMgAl-LDHs display uniform size with high degree of crystallinity with a specific surface area of 84.983 m2/g. And the NiMgAl-LDHs shows a higher adsorption performance for methyl orange under acidic condition. When the pH value is 3.0, the adsorbent dosage is 10 mg, the adsorption time is 45 min, the volume of solution is 50 mL and the initial concentration is 40 mg/L, the removal ratio of methyl orange can reach 99.0%.The adsorption process is better described by second-order kinetic model, and the thermodynamics of NiMgAlLDHs adsorption is better described by Langmuir mode, whose maximum adsorption capacity of NiMgAl-LDHs is 250 mg/g. Thus, the NiMgAl-LDHs prepared in this paper can efficiently and rapidly remove methyl orange by adsorption, exhibiting potential in the treatment of printing and dyeing wastewater.
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基本信息:
DOI：
中图分类号:X703;TQ424
引用信息:
[1]周良芹,石小琴,王蓉等.NiMgAl-LDHs的制备及其对甲基橙的吸附性能研究[J].四川轻化工大学学报(自然科学版),2024,37(04):1-10.
基金信息:
四川省科技厅重点项目(2020YFS0347); 绿色催化四川省高校重点实验室项目(LZJ1704); 精细化工助剂及表面活性剂四川省高校重点实验室项目(2017JXY01)