| Deep eutectic solvents(DESs)are the new green solvent emerging in recent years.Generally,DESs are mixing by two or more components at a certain temperature with a melting point lower than any of the components and below 100°C.DESs usually has high thermal stability,low volatility,low vapor pressure and adjustable polarity,especially good solubility of metal ions and metal oxides.Based on these properties,DESs have a good application in many fields.In this paper,according to the composition types of DESs,two types IV DESs were constructed:methyltriphenylphosphonium bromide(MTPB)/glycerol(DES No.1)and magnesium chloride hexahydrate/1,6-hexanediol(DES No.2).The shift of characteristic peaks of related functional groups was observed by infrared spectroscopy,indicating the existence of hydrogen bonding in the DESs.In addition,the results of the 90-days samples retention experiment showed that the DESs had good stability.Based on these results,a series of single anatase titanium dioxide(Ti O2)with good purity were synthesized by hydrothermal method using DES No.1 and DES No.2 as template agent,stabilizer and solvent,respectively.Then,the pore properties of the synthesized Ti O2 were determined by nitrogen adsorption(BET)and transmission electron microscopy(TEM).The results show that the pore size of the synthesized Ti O2increases with the increase of reaction temperature at the same reaction time,and the pore size first increases and then decreases with the increase of reaction time at the same reaction temperature.The synthesized Ti O2 has good catalytic degradation ability for malachite green and rhodamine B.The results showed that the degradation rate of malachite green and rhodamine B by Ti O2-2-160-12 reached 99.3%and 86.8%in 40min and 50 min,respectively.At the same time,the catalytic ability of Ti O2-2-160-12did not decrease significantly after five cycle tests.Additionally,we also investigated the effect of different molar ratios of DESs on the pore properties of materials in the preparation of materials,that is,using different molar ratios of 1,6-hexanediol/magnesium chloride hexahydrate DES No.2 as template agent,stabilizer and solvent,a series of porous ZIF-8 materials were successfully prepared in the relatively mild conditions.The BET results demonstrated that the specific surface area and pore size of the synthesized ZIF-8 series materials increased with the increase of the molar ratio of the hydrogen bond donor(1,6-hexanediol)in the DESs.The prepared porous ZIF-8 materials were used as adsorbent to adsorb heavy metal ions(Pb2+and Cu2+),and the order of the saturated adsorption amounts by the four ZIF-8 materials was related to the specific surface area of the materials at p H=5.5,adsorbent concentration C absorption=1.0 g·L-1,the initial concentration of heavy metal ions(Pb2+and Cu2+)in aqueous solution is C0=200 mg L-1,and the adsorption temperature T=25±1?,and the saturated adsorption capacity of ZIF-8-10-1 for Pb2+and Cu2+reached 1189 mg·g-1 and 595 mg·g-1,respectively.In this paper,a new method for the green and controllable preparation of porous materials was explored in type IV DESs by changing the experimental conditions(reaction time and reaction temperature)and the molar ratio of hydrogen bond donors in deep eutectic solvents for the synthesis of porous materials. |
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