新型負載型除濕材料性能的研究
發(fā)布時間：2019-04-04 14:00
【摘要】：除濕是工業(yè)生產(chǎn)和人們?nèi)粘Ｉ钪薪?jīng)常遇到的問題。濕度的合理控制對于保護人體健康、改善生活環(huán)境、提升生活品質(zhì)等都具非常重要的意義。在吸附除濕領域中，固體多孔吸附材料的吸濕性能是關(guān)鍵。針對傳統(tǒng)除濕材料存在吸濕容量低、再生難的問題，本文主要研制了適用低濕度范圍的鈣改性分子篩和適用中等濕度范圍的鎂改性硅膠材料，考察了制備條件對其除濕性能性能的影響，探究了水蒸氣在除濕材料上的吸附動力學，并與幾種商用的分子篩、硅膠材料進行性能比較，此外，還對MOFs材料在除濕領域的潛在應用進行探索。 本文研究了改性分子篩除濕材料在低濕度范圍內(nèi)的除濕性能。結(jié)果表明：同條件下Ca-5A的吸濕性能較好；且當紙片浸漬負載時間為10min，CaCl2為2.0M時，所制備的改性分子篩的除濕穩(wěn)定性較好，其除濕性能為日本及瑞典分子篩的2倍以上；吸濕動力學的實驗結(jié)果顯示：水蒸氣在2.0M-Ca-5A-0.5H~+上的擴散屬活化擴散，，擴散系數(shù)在10-10cm2/s范圍內(nèi)，吸附活化能為45.41kJ/mol。 本文研究了改性硅膠除濕材料在中等濕度范圍內(nèi)的除濕性能。研究表明：同條件下Mg-B的吸濕性能最好；其最佳的制備條件為：負載時間10min，MgCl2濃度2.0M；在該條件下所制備的改性硅膠除濕材料具有較好的除濕穩(wěn)定性，其除濕效果優(yōu)于廣東某公司和瑞典硅膠40%以上；估算得到水蒸氣在材料中的擴散系數(shù)介于3.07-14.68×10-10cm2/s之間，吸附活化能為38.15kJ/mol，亦表明其擴散過程屬于活化擴散。 本文對幾種水熱穩(wěn)定性較好的MOFs材料進行負載制備，并對其除濕性能進行研究。研究表明：MOF-SCUT2#和MOF-SCUT3#在低濕度范圍內(nèi)的除濕量為傳統(tǒng)4A、5A分子篩的2-3倍以上，而脫附溫度相對較高，這是由于這兩種材料具有較密集的微孔以及骨架結(jié)構(gòu)中不飽和金屬吸附位點的強吸附作用；MOF-SCUT1#及其與氧化石墨復合材料則在中高濕度條件下，對水汽顯示出很高的吸附容量，其除濕量為傳統(tǒng)硅膠材料的2.8-5.1倍，由于水分子是通過氫鍵的“搭橋效應”形成水簇的，這種較弱的相互作用力使得這兩種材料在脫附性能也有較強的競爭優(yōu)勢。
[Abstract]:Dehumidification is a common problem in industrial production and people's daily life. The reasonable control of humidity is very important to protect human health, improve the living environment and improve the quality of life. In the field of adsorption and dehumidification, the moisture absorption performance of solid porous adsorption materials is the key. In order to solve the problems of low moisture absorption capacity and difficult regeneration of traditional dehumidifying materials, calcium modified molecular sieves suitable for low humidity range and magnesium modified silica gel materials suitable for medium humidity range were mainly developed in this paper. The influence of preparation conditions on its dehumidification performance was investigated, and the adsorption kinetics of water vapor on dehumidifying materials was investigated. In addition, the adsorption kinetics of water vapor on dehumidifying materials was compared with that of several commercial molecular sieves and silica gel materials. The potential application of MOFs in the field of dehumidification is also explored. In this paper, the dehumidification performance of modified molecular sieve dehumidification material in low humidity range has been studied. The results showed that the hygroscopicity of Ca-5A was better under the same conditions. When the impregnation time was 10 min and CaCl _ 2 was 2.0 M, the dehumidification stability of the modified zeolites was better, and the dehumidification performance of the modified zeolites was more than 2 times as high as that of Japanese and Swedish zeolites. The experimental results of hygroscopic kinetics show that the diffusion of water vapor on 2.0m Ca ~ (5 +) _ (5) A ~ (0.5) H ~ (2 +) belongs to activation diffusion. The diffusion coefficient is in the range of 10-10cm2/s, and the adsorption activation energy is 45.41 kJ 路mol ~ (- 1). The dehumidification performance of modified silica gel dehumidification material in medium humidity range was studied in this paper. The results showed that Mg-B had the best hygroscopicity under the same conditions, and the optimum preparation conditions were as follows: loading time 10 min, MgCl _ 2 concentration 2.0M; The modified silica gel dehumidification material prepared under this condition has good dehumidification stability, and its dehumidification effect is better than that of some Guangdong company and Sweden silica gel more than 40%. It is estimated that the diffusion coefficient of water vapor in the material ranges from 3.07 to 14.68 脳 10-10cm2/s, and the adsorption activation energy is 38.15 kJ / mol, which also indicates that the diffusion process belongs to activation diffusion. In this paper, several MOFs materials with good hydrothermal stability were prepared by loading and their dehumidification properties were studied. The results show that the amount of dehumidification of MOF-SCUT2# and MOF-SCUT3# in low humidity range is higher than that of traditional 4A, and the desorption temperature of 5A molecular sieves is higher than that of 5A molecular sieves. This is due to the dense micropores and the strong adsorption of unsaturated metal sites in the framework structure of the two materials. MOF-SCUT1# and its composites with graphite oxide exhibit a high adsorption capacity for water vapor under medium and high humidity conditions, and the dehumidification amount is 2.8 脳 5. 1 times as much as that of traditional silica gel materials, and the dehumidification capacity of the composites is higher than that of conventional silica gel materials. Because water molecules form water clusters through the "bridging effect" of hydrogen bonds, this weak interaction makes the two materials have a strong competitive advantage in desorption performance.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TQ424;TU834.9
本文編號：2453887
[Abstract]:Dehumidification is a common problem in industrial production and people's daily life. The reasonable control of humidity is very important to protect human health, improve the living environment and improve the quality of life. In the field of adsorption and dehumidification, the moisture absorption performance of solid porous adsorption materials is the key. In order to solve the problems of low moisture absorption capacity and difficult regeneration of traditional dehumidifying materials, calcium modified molecular sieves suitable for low humidity range and magnesium modified silica gel materials suitable for medium humidity range were mainly developed in this paper. The influence of preparation conditions on its dehumidification performance was investigated, and the adsorption kinetics of water vapor on dehumidifying materials was investigated. In addition, the adsorption kinetics of water vapor on dehumidifying materials was compared with that of several commercial molecular sieves and silica gel materials. The potential application of MOFs in the field of dehumidification is also explored. In this paper, the dehumidification performance of modified molecular sieve dehumidification material in low humidity range has been studied. The results showed that the hygroscopicity of Ca-5A was better under the same conditions. When the impregnation time was 10 min and CaCl _ 2 was 2.0 M, the dehumidification stability of the modified zeolites was better, and the dehumidification performance of the modified zeolites was more than 2 times as high as that of Japanese and Swedish zeolites. The experimental results of hygroscopic kinetics show that the diffusion of water vapor on 2.0m Ca ~ (5 +) _ (5) A ~ (0.5) H ~ (2 +) belongs to activation diffusion. The diffusion coefficient is in the range of 10-10cm2/s, and the adsorption activation energy is 45.41 kJ 路mol ~ (- 1). The dehumidification performance of modified silica gel dehumidification material in medium humidity range was studied in this paper. The results showed that Mg-B had the best hygroscopicity under the same conditions, and the optimum preparation conditions were as follows: loading time 10 min, MgCl _ 2 concentration 2.0M; The modified silica gel dehumidification material prepared under this condition has good dehumidification stability, and its dehumidification effect is better than that of some Guangdong company and Sweden silica gel more than 40%. It is estimated that the diffusion coefficient of water vapor in the material ranges from 3.07 to 14.68 脳 10-10cm2/s, and the adsorption activation energy is 38.15 kJ / mol, which also indicates that the diffusion process belongs to activation diffusion. In this paper, several MOFs materials with good hydrothermal stability were prepared by loading and their dehumidification properties were studied. The results show that the amount of dehumidification of MOF-SCUT2# and MOF-SCUT3# in low humidity range is higher than that of traditional 4A, and the desorption temperature of 5A molecular sieves is higher than that of 5A molecular sieves. This is due to the dense micropores and the strong adsorption of unsaturated metal sites in the framework structure of the two materials. MOF-SCUT1# and its composites with graphite oxide exhibit a high adsorption capacity for water vapor under medium and high humidity conditions, and the dehumidification amount is 2.8 脳 5. 1 times as much as that of traditional silica gel materials, and the dehumidification capacity of the composites is higher than that of conventional silica gel materials. Because water molecules form water clusters through the "bridging effect" of hydrogen bonds, this weak interaction makes the two materials have a strong competitive advantage in desorption performance.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TQ424;TU834.9
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