This article discussed the benzoic acid activated carbons which have changed the types and content of acid oxygen-function groups on the surface of activated carbons and their effect on the adsorption for Hg^0 in simu...This article discussed the benzoic acid activated carbons which have changed the types and content of acid oxygen-function groups on the surface of activated carbons and their effect on the adsorption for Hg^0 in simulated flue gas at 140 ℃. These surface acid oxygen function groups were identified by Boehm titration, Fourier transformation infrared spectrum, temperature programmed desorption and X-ray photoelectron spectroscopy. It indicates that the carboxyl, lactone and phenolic were formed when the benzoic acid is loaded on the surface of activated carbons. Among the surface acid oxygen function groups, the carboxyl groups enhance the adsorption capacities of Hg^0 for activated carbons to a greater extent.展开更多
A kind of modifier was synthesized to modify the surface of nanometer calcium carbonate （abbreviated as nano-CaCO3）, which is used in architectural coatings. The modification technology of the nano-CaCO3 was studied...A kind of modifier was synthesized to modify the surface of nanometer calcium carbonate （abbreviated as nano-CaCO3）, which is used in architectural coatings. The modification technology of the nano-CaCO3 was studied through orthogonal experimental methods. The factors studied were rotation speed, modifier dosage, emulsification temperature, emulsification time and heat aging time after emulsification. Optimized conditions for modification of the surface were： rotation speed 16000 r/min; modifier dosage 3%; emulsification temperature 75 ℃; emulsification time 60 min and aging time 40 min. The modified nano-CaCO3 was also studied by size-distribution measurements, transmission electron microscopy, infrared spectroscopy and thermal analysis. The results show that the size distribution of the modified nano-CaCO3 is uniform and that there are chemi-sorption and physi-sorption between the nano-CaCO3 and the modifier. Compared to traditional architectural coatings without nano-CaCO3, the nanometer composite coatings are obviously improved in respect to dirt resistance, scrub resistance, thixotropy, water resistance, alkalinity resistance and aging resistance.展开更多
尽可能低的吸油值是人造石材对重质碳酸钙填料的主要技术指标要求之一。选取聚乙二醇-200、一缩二乙二醇、三乙醇胺和氨基硅油-804为改性剂,采用干法对重质碳酸钙填料进行表面改性,以吸油值为表征手段,研究了改性剂品种及其用量对重质...尽可能低的吸油值是人造石材对重质碳酸钙填料的主要技术指标要求之一。选取聚乙二醇-200、一缩二乙二醇、三乙醇胺和氨基硅油-804为改性剂,采用干法对重质碳酸钙填料进行表面改性,以吸油值为表征手段,研究了改性剂品种及其用量对重质碳酸钙填料吸油值影响的规律,并结合红外光谱分析和热重分析对改性机理进行了讨论。结果表明:改性样品的吸油值随改性剂用量的增大而下降,采用氨基硅油-804改性剂且用量为1.00%时,改性样品的吸油值最低,达到0.115 m L/g,改性后样品的热稳定性最好,热分解温度为325℃;4种改性剂均与重质碳酸钙粉体表面的官能团羟基发生了化学键合作用。展开更多
文摘This article discussed the benzoic acid activated carbons which have changed the types and content of acid oxygen-function groups on the surface of activated carbons and their effect on the adsorption for Hg^0 in simulated flue gas at 140 ℃. These surface acid oxygen function groups were identified by Boehm titration, Fourier transformation infrared spectrum, temperature programmed desorption and X-ray photoelectron spectroscopy. It indicates that the carboxyl, lactone and phenolic were formed when the benzoic acid is loaded on the surface of activated carbons. Among the surface acid oxygen function groups, the carboxyl groups enhance the adsorption capacities of Hg^0 for activated carbons to a greater extent.
文摘A kind of modifier was synthesized to modify the surface of nanometer calcium carbonate （abbreviated as nano-CaCO3）, which is used in architectural coatings. The modification technology of the nano-CaCO3 was studied through orthogonal experimental methods. The factors studied were rotation speed, modifier dosage, emulsification temperature, emulsification time and heat aging time after emulsification. Optimized conditions for modification of the surface were： rotation speed 16000 r/min; modifier dosage 3%; emulsification temperature 75 ℃; emulsification time 60 min and aging time 40 min. The modified nano-CaCO3 was also studied by size-distribution measurements, transmission electron microscopy, infrared spectroscopy and thermal analysis. The results show that the size distribution of the modified nano-CaCO3 is uniform and that there are chemi-sorption and physi-sorption between the nano-CaCO3 and the modifier. Compared to traditional architectural coatings without nano-CaCO3, the nanometer composite coatings are obviously improved in respect to dirt resistance, scrub resistance, thixotropy, water resistance, alkalinity resistance and aging resistance.
文摘尽可能低的吸油值是人造石材对重质碳酸钙填料的主要技术指标要求之一。选取聚乙二醇-200、一缩二乙二醇、三乙醇胺和氨基硅油-804为改性剂,采用干法对重质碳酸钙填料进行表面改性,以吸油值为表征手段,研究了改性剂品种及其用量对重质碳酸钙填料吸油值影响的规律,并结合红外光谱分析和热重分析对改性机理进行了讨论。结果表明:改性样品的吸油值随改性剂用量的增大而下降,采用氨基硅油-804改性剂且用量为1.00%时,改性样品的吸油值最低,达到0.115 m L/g,改性后样品的热稳定性最好,热分解温度为325℃;4种改性剂均与重质碳酸钙粉体表面的官能团羟基发生了化学键合作用。
