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唐振平,谢严兴,毕玉玺,等. 磁性介孔二氧化钛/氧化石墨烯复合材料的制备及其对Cd(Ⅱ)的吸附[J]. 科学技术与工程, 2019, 19(35): 388-394.
Tang Zhenping,Xie Yanxing,et al.Preparation of magnetic mesoporous titanium dioxide/graphene oxide composites and their adsorption of Cd(Ⅱ)[J].Science Technology and Engineering,2019,19(35):388-394.
磁性介孔二氧化钛/氧化石墨烯复合材料的制备及其对Cd(Ⅱ)的吸附
Preparation of magnetic mesoporous titanium dioxide/graphene oxide composites and their adsorption of Cd(Ⅱ)
投稿时间:2019-04-23  修订日期:2019-06-03
DOI:
中文关键词:  氧化石墨烯  磁性介孔二氧化钛  Cd(Ⅱ)  吸附
英文关键词:graphene oxide  magnetic mesoporous titanium dioxide  Cd(Ⅱ)  adsorption
基金项目:湖南省自然科学基金(2016JJ6125);南华大学研究生科学基金(2018KYY114)。
              
作者单位
唐振平 南华大学 污染控制与资源化湖南省重点实验室
谢严兴 南华大学 污染控制与资源化湖南省重点实验室
毕玉玺 南华大学 污染控制与资源化湖南省重点实验室
凌辉 南华大学 污染控制与资源化湖南省重点实验室
周帅 南华大学 污染控制与资源化湖南省重点实验室
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中文摘要:
      以钛酸四丁酯、纳米四氧化三铁和氧化石墨烯(GO)为主要原料,通过化学沉积法和水热法合成了磁性介孔二氧化钛/氧化石墨烯(MTiO2/GO)复合材料,并用其处理含Cd(Ⅱ)废水。采用了X射线衍射仪、傅里叶变换红外光谱和紫外-可见漫反射光谱仪等手段对MTiO2/GO进行结构表征,考察了GO含量、MTiO2/GO投加量、溶液初始pH、反应时间和Cd(Ⅱ)初始浓度对MTiO2/GO吸附Cd(Ⅱ)的影响,分析了吸附过程的动力学和等温线特征。结果表明,在GO质量分数为60wt%,MTiO2/GO投加量为10mg,pH值为6和吸附时间为90min的条件下,MTiO2/GO对10mg/L Cd(Ⅱ)的吸附效果最佳,吸附率为95.43%。吸附过程符合准二级动力学模型和Freundlich吸附等温模型。经5次吸附-解吸后,Cd(Ⅱ)的吸附率仍高达91.85%,说明MTiO2/GO具有较高的循环利用性能。
英文摘要:
      The magnetic mesoporous titania/graphene oxide (MTiO2/GO) was synthesized by the materials of graphene oxide (GO), nano-ferroferric oxide and tetrabutyl titanate, through the chemical deposition and hydrothermal method, and was used to treat Cd(Ⅱ)-containing wastewater. MTiO2/GO was characterized by EDS, FTIR and UV-Vis techniques. The effect of GO content in MTiO2/GO, the dosage of MTiO2/GO, the initial pH of solution, the reaction time, and the initial Cd(Ⅱ) concentration on Cd(Ⅱ) adsorption by MTiO2/GO were investigated. The isotherm and kinetics of adsorption were explored. The result showed that MTiO2/GO is a kind of adsorbent with rough surface, large specific surface area and tiny photocatalytic particles on its surface. With GO mass fraction of 60wt%, the pH value of 6, the MTiO2/GO dosage of 10mg and adsorption time of 120 min, the maximum adsorption efficiency of Cd(Ⅱ) by MTiO2/GO was up to 95.43%. The adsorption on Cd(Ⅱ) process can be well described by the pseudo-second order kinetics model and Freundlich isotherm model. The adsorption-desorption experiments showed that the adsorption efficiency of Cd(Ⅱ) remained as high as 91.85% after 5 cycles of adsorption- desorption, indicating the highly circular utilization of MTiO2/GO.
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