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11.
Sb(Ⅲ) is often detected in contaminated soil and groundwater. Hence, high-efficiency technology is needed. In this study, bimetallic organic frameworks were used for the first time to immobilize Sb(Ⅲ) from contaminated soil and groundwater. The materials were synthesized by the hydrothermal method. Both ends of the prepared material were hexagonal tip rods,and the length became shorter as the ratio of Fe/Mg decreased. The bimetallic organic framework with a Fe/Mg feeding ratio of 0.5 was the opt... 相似文献
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水热法合成了MOF-Fe样品,研究了不同pH条件下MOF-Fe对亚硒酸根(Se(Ⅳ))的等温吸附和动力学吸附特性;基于吸附前后样品悬浮液的pH和Zeta电位、粉末样品的衰减漫反射红外光谱(ATR-IR)和X-射线光电子能谱(XPS),分析了MOF-Fe对Se(Ⅳ)的吸附机制.当吸附体系的初始pH分别为3.0、4.0和5.0时,样品对Se(Ⅳ)的Langmuir最大吸附容量(Qm)分别为0.690、0.534和0.538 mmol·g-1,3种pH条件下的吸附亲和力(b)表现为pH 3.0pH 4.0pH 5.0.3种pH条件下,样品对Se(Ⅳ)的吸附都在20 min内趋于饱和,二级动力学方程对吸附动力学数据的拟合度(R2)均大于0.999,MOF-Fe吸附Se(Ⅳ)的内扩散过程可用Weber-Morris方程描述.当吸附体系初始pH为3.0时,MOF-Fe与Se(Ⅳ)之间的吸附作用机制主要为:配位不饱和Fe与H_2SeO_3之间的配位作用、脱羟基后的活性Fe与[O_2SeOH]~-的键合作用及单齿羧羰基氧与Se(Ⅳ)之间的氢键作用.当吸附体系初始pH为5.0时,MOF-Fe与Se(Ⅳ)之间的吸附作用机制主要为:Fe—OH与[O_2SeOH]~-的阴离子交换作用,[SeO_3]~(2-)破坏了桥式羧羟基Fe—O键并与Fe—OH发生阴离子交换作用形成双齿吸附态Se(Ⅳ)以及单齿羧羰基氧与Se(Ⅳ)之间的氢键作用. 相似文献
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Chompoonoot Nanthamathee 《环境科学学报(英文版)》2019,31(7):68-79
In this research, for the first time, a series of Co(Ⅱ) doped copper terephthalate(Co X-Cu BDC,where X is doping percentage) were successfully synthesized via solvothermal method and were tested for dye removal application. The physical properties of Co X-CuBDC were studied by several techniques including X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), energy-dispersive spectroscopy(EDS), thermogravimetric analysis(TGA)and Brunauer–Emmett–Teller(BET) surface area analysis. The incorporation of Co(Ⅱ) dopant leads to isomorphic substitution of Cu(II) in the CuBDC framework with the maximum doping percentage of 22. Doping and parent MOFs which are non-porous were used for removal of Methylene Blue(MB) from aqueous solution. Adsorption capacity of Co22-CuBDC and CuBDC are 52 and 58 mg/g, respectively, both of which are higher than the adsorption capacity recorded from several high porosity MOFs. Adsorption kinetic studies indicate that adsorption process follows pseudo-second order model while the adsorption mechanism is dominated by electrostatic attraction. Overall, even though these materials show non-porous characteristic,it can be used effectively in wastewater treatment application. 相似文献
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