РОССИЙСКАЯ АКАДЕМИЯ НАУК

УРАЛЬСКОЕ ОТДЕЛЕНИЕ

ИНСТИТУТ ХИМИИ TBEPДОГО ТЕЛА
   
| | | | |
| | | |
 04.05.2011   Карта сайта     Language По-русски По-английски
Новые материалы
Экология
Электротехника и обработка материалов
Медицина
Статистика публикаци


04.05.2011



Titanate cigarette filter



03 May 2011



Chinese researchers have shown for the first time that nanomaterials made from titanium dioxide (TiO2) can be used in cigarette filters to significantly reduce the amount of harmful chemicals inhaled by smokers. They say it offers a cheaper and safer alternative than using carbon-based nanomaterials and show potential for use in other filtering devices including gas masks and air purification systems.


Current cigarette filters are made from cellulose acetate, which absorbs some of the toxic and carcinogenic compounds present in tobacco smoke, including tar, nicotine, polycyclic aromatic hydrocarbons and tobacco-specific nitrosamines. In recent years, scientists have attempted to improve standard filters by adding nanomaterials, including carbon nanotubes or mesoporous silica, to capture more of these chemicals. But these experimental methods remain expensive and could pose unknown health risks.



Cigarette in a hand








Amounts of harmful compounds inhaled by smokers including tar, nicotine, ammonia and hydrogen cyanide can be reduced by the filter



Now, Mingdeng Wei's lab at Fuzhou University in Fujian province, together with colleagues at the Fujian Tobacco Industrial Corporation, Xiamen, have found that titanate nanosheets and nanotubes can filter tobacco smoke. 'A great range of harmful compounds including tar, nicotine, ammonia, hydrogen cyanide, selected carbonyls and phenolic compounds can be reduced efficiently,' says Wei.


Since these nanomaterials can be easily synthesised using titanium dioxide as a precursor under mild conditions, Wei says they are much cheaper to produce than other materials. What's more, since TiO2 is already widely used in consumer products including sunscreens, cosmetics and food, the team is confident that titanate nanomaterials used in filters do not pose a health risk to smokers by inhalation.


Using standard methods, the team synthesised titanate nanosheets and titanate nanotubes and added them to the filter tips of cigarettes. After machine smoking them and capturing the smoke condensates on filter pads, the team used various methods including ion chromatography and high performance liquid chromatography to measure the amount of different captured chemicals. They discovered that the tube additives were around twice as efficient as the sheets at capturing harmful compounds.


They reckon this difference is related to the intrinsic properties of the two materials - the tubes are composed of crystalline multilayer walls, which resemble a nanoscale chromatography column, while the sheets are sheet-shaped structures. 'A large number of H+ can exist on the surface or in the interlayer space of the tubes. When the cigarette smoke passes through the tubes, NH3, hydroquinone, catechol and phenol react with H+ via chemical absorption and can be retained on the surface or in the interlayer space of the tubes,' Wei explains.


'The results are quite interesting and could be potentially very useful in this area of filtering applications,' says Dmitry Bavykin who investigates titanate nanomaterials at the Universtiy of Southampton, UK. However, he is unconvinced that the difference in absorption properties of the tubes and the sheets can be attributed to the nanotubes acting like a chromatographic column. 'In my view, the difference between the tubes and the sheets can be associated with the differences in specific surface area of these materials.'


James Urquhart



Interesting? Spread the word using the 'tools' menu on the left.




Link to journal article



Significant reduction of harmful compounds in tobacco smoke by the use of titanate nanosheets and nanotubes
Qixin Deng, Chaozhang Huang, Wei Xie, Jianping Zhang, Yiqiang Zhao, Zhensheng Hong, Aiying Pang and Mingdeng Wei, Chem. Commun., 2011


Дизайн и программирование N-Studio 
А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

  • © 2004-2019 ИХТТ УрО РАН
    беременность, мода, красота, здоровье, диеты, женский журнал, здоровье детей, здоровье ребенка, красота и здоровье, жизнь и здоровье, секреты красоты, воспитание ребенка рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок медицина, клиники и больницы, болезни, врач, лечение, доктор, наркология, спид, вич, алкоголизм православные знакомства, православный сайт творчeства, православные рассказы, плохие мысли, православные психологи рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок