以MOF-5为改性剂对纤维素水凝胶进行掺杂改性,通过FT-IR、XRD和SEM对其结构进行了表征,并研究了掺杂量、pH、盐溶液浓度、温度对复合纤维素水凝胶保水性能的影响及其可循环利用特性。结果表明,纤维素水凝胶表面的活性基团,有利于MOF-5...以MOF-5为改性剂对纤维素水凝胶进行掺杂改性,通过FT-IR、XRD和SEM对其结构进行了表征,并研究了掺杂量、pH、盐溶液浓度、温度对复合纤维素水凝胶保水性能的影响及其可循环利用特性。结果表明,纤维素水凝胶表面的活性基团,有利于MOF-5与其结合,与纯纤维素水凝胶相比,吸水率最高达4294.94%,提高了1725.63%。保水性实验发现,复合水凝胶在NaCl、AlCl3盐溶液中的保水效果随着浓度增大而减小;当MOF-5掺杂量为20%、pH=12、盐溶液浓度为4 m mol/L时具有最佳的保水效果,且在40℃,放置175 min,最佳掺杂量的复合纤维素水凝胶保水率仍在50%以上。可循环利用性实验证实,复合纤维素水凝胶循环使用3次时,其保有率仍高于50%。实验结果表明该复合水凝胶在高温农业生产领域有潜在应用价值。展开更多
One porous framework [Zn4(μ4-O)(μ4-4-pca)3]·2(DEF)·2(H2O)(1, 4-H2Pca = 4-pyrazolecarboxylic acid, DEF = N,N-diethylformamide) with MOF-5 type topology has been synthesized solvothermally. Signifi...One porous framework [Zn4(μ4-O)(μ4-4-pca)3]·2(DEF)·2(H2O)(1, 4-H2Pca = 4-pyrazolecarboxylic acid, DEF = N,N-diethylformamide) with MOF-5 type topology has been synthesized solvothermally. Significantly, this compound exhibits high capacity of C2 hydrocarbons. C2H2 capacity could compare with the highest value of the reported MOFs, far exceeding that of MOF-5, as well as the high selectivity adsorption of C2s over C1.展开更多
文摘以MOF-5为改性剂对纤维素水凝胶进行掺杂改性,通过FT-IR、XRD和SEM对其结构进行了表征,并研究了掺杂量、pH、盐溶液浓度、温度对复合纤维素水凝胶保水性能的影响及其可循环利用特性。结果表明,纤维素水凝胶表面的活性基团,有利于MOF-5与其结合,与纯纤维素水凝胶相比,吸水率最高达4294.94%,提高了1725.63%。保水性实验发现,复合水凝胶在NaCl、AlCl3盐溶液中的保水效果随着浓度增大而减小;当MOF-5掺杂量为20%、pH=12、盐溶液浓度为4 m mol/L时具有最佳的保水效果,且在40℃,放置175 min,最佳掺杂量的复合纤维素水凝胶保水率仍在50%以上。可循环利用性实验证实,复合纤维素水凝胶循环使用3次时,其保有率仍高于50%。实验结果表明该复合水凝胶在高温农业生产领域有潜在应用价值。
基金supported financially by the National Natural Science Foundation of China(No.21601080)the Key Scientific Research Projects of Higher Education of He'nan Province(16A150016)
文摘One porous framework [Zn4(μ4-O)(μ4-4-pca)3]·2(DEF)·2(H2O)(1, 4-H2Pca = 4-pyrazolecarboxylic acid, DEF = N,N-diethylformamide) with MOF-5 type topology has been synthesized solvothermally. Significantly, this compound exhibits high capacity of C2 hydrocarbons. C2H2 capacity could compare with the highest value of the reported MOFs, far exceeding that of MOF-5, as well as the high selectivity adsorption of C2s over C1.