Water vapor adsorption in activated carbon modified with hydrophilic organic salts

Five different kinds of hydrophilic organic salts were used to modify commercial activated carbon in order to prepare hydrophilic carbon materials. Properties of the samples were analyzed by surface area analyzer and SEM-EDX. The hydrophilic organic salts with different properties were introduced into activated carbon and significantly affected the properties of the samples.During adsorption experiments, the water vapor adsorption amount in modified samples increases by 0.57-17.12 times in temperature range from 303 to 323 K and at relative pressure below 0.50. Water molecules combined with surface hydrophilic groups through H-bonding exhibit good thermo stability. The effects of temperature, oxygen content and properties of the hydrophilic organic salts on water vapor adsorption were studied. It is indicated that water vapor adsorption in modified samples is mainly affected by the surface oxygen content. The carboxylate radicals in the hydrophilic organic salts greatly affect the micropore structure of the modified samples, while the metal ions in them exhibit limited influence. Different adsorption capacity of modified samples can be explained with the electronegativity of elements presented by Pauling.     

家具甲醛散发量测试研究

建立了一种不同于现行木家具标准的测试方法,利用30m3大型空气质量测试舱,模拟家具的实际使用环境对几类不同材质的家具在散发稳定阶段的单位面积甲醛释放量进行了测试.分析了不同材质的家具的散发规律、稳定阶段的单位面积散发量.最后讨论了本文提出的家具的测试方法及测试指标在实际工程中的应用价值.     

酸改性活性炭对甲苯、甲醇的吸附性能

分别用1 mol·L^-1硝酸、1 mol·L^-1盐酸、1 mol·L^-1硫酸对商业活性炭进行浸渍改性。采用比表面积及孔径分析仪、Boehm滴定、傅里叶转换红外光谱(FTIR)对活性炭的物化性质进行表征。以甲苯、甲醇为吸附质,在283 K下进行了固定床吸附实验。研究表明:酸改性能去除表面碱性基团,显著增加表面酸性含氧官能团的含量;酸改性活性炭的吸附量与其比表面积、总孔容、微孔孔容、表面总酸性官能团呈现出良好的线性关系;Langmuir方程比Freundlich方程更加适合描述甲苯、甲醇在活性炭上的吸附;甲醇在活性炭上为物理吸附,甲苯在活性炭上以物理吸附为主,与表面官能团之间的化学键作用能增强甲苯吸附量;甲苯、甲醇在活性炭上的微孔有效扩散系数的大小顺序为:AC-N>AC-1>AC-S>AC-C;并且甲醇的微孔有效扩散系数大于甲苯。     

保护膜用高剥离力丙烯酸酯乳液压敏胶的研制

以丙烯酸丁酯（BA）、丙烯酸酯（2-EHA）、甲基丙烯酸甲酯（MMA）、苯乙烯（St）、丙烯酸（AA）、丙烯酸羟丙酯（HPA）为原料进行乳液共聚,合成了保护膜用丙烯酸酯乳液压敏胶,讨论了各种单体、乳化剂、交联剂对压敏胶性能的影响。结果表明,该压敏胶具有较高的剥离强度和初黏力,同时具有较好的耐高温高湿老化性能。     

Pressure swing adsorption modeling of acetone and toluene on activated carbon

A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory of Soret and Dufour, a non-isothermal mathematical model was developed to simulate the PSA process. Effects of heat and mass transfer coefficients were studied. The coupled Soret and Dufour effects were also evaluated. It is found that the heat transfer coefficient has little effect on mass transfer in adsorption stage. However, it has some impacts in desorption stage. The maximum value of C/C0 increases by about 25% as heat transfer coefficient decreases. The temperature variation is less than 0.05 K with the change of mass transfer coefficient, so that the effect of mass transfer coefficient on heat transfer can be ignored. It is also concluded that the Soret and Dufour coupled effects are not obvious in pressure swing adsorption compared with fixed-bed adsorption.     

论工程造价预结算审核

本文阐述了在工程造价的预结算审核中，根据确定合理工程造价预结算审核的必要程序和重要的手段。由于建设工程预结算的审棱是一门专业性、知识性、政策性、技巧性很强的工作，因此需要我们在工作中不断地学习、总结和提高。     

吡唑醚菌酯在不同土壤中的吸附和降解及竹炭对其影响

为评价吡唑醚菌酯在不同土壤中的吸附和降解及竹炭对其影响,采用振荡平衡法和室内模拟试验开展了研究.结果表明,吡唑醚菌酯在土壤中的吸附符合Freundlich吸附方程,其在红土、黑土、水稻土、黄土和褐土中的Kd值分别为10.64、27.17、19.79、14.22和16.14,且与土壤有机质含量呈显著正相关(P<0.01)...     

Fe_3O_4添加剂对煤燃烧释放PAHs的影响

研究Fe_3O_4添加剂在不同燃烧温度下对燃煤过程释放16种PAHs排放特征的影响。结果表明:Fe_3O_4对煤燃烧产生PAHs具有降解作用,当燃烧温度为850℃,添加比例为2%时,PAHs排放总量下降12.24%,其中3环PAHs排放总量下降5.08%,降幅最大。高温有利于Fe_3O_4抑制烟气中PAHs的生成。Fe_3O_4能够促进高分子质量PAHs富集在固相中。在950℃时,添加比例为2%时,Fe_3O_4可最大程度降低16种PAHs的毒性当量,降幅达到45.78%。