Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

Treatment of chrome plating wastewater (Cr+6) using activated alumina.

Abstract: Suitability of activated alumina for removal of hexavalent chromium from electroplating wastewater has been investigated. Activated alumina exhibited good sorption capacity for hexavalent chromium and pH has no pronounced effect on the sorption capacity. Both batch and column adsorption studies have been carried out and an adsorption column design indicated reasonable depth of column for practical application.

Method for preparing catalyst for hydrogenating pyridine compound and application thereof

Abstract: The invention discloses a method for preparing a catalyst for hydrogenating a pyridine compound. The method comprises the following steps of: 1, pre-treating activated carbon; 2, preparing a precursor solution; 3, immersing the activated carbon by the precursor solution; 4, reducing, washing and drying to obtain the catalyst. The invention also discloses another method for preparing the catalyst for hydrogenating a pyridine compound, which comprises the following steps of: 1, pre-treating alumina; 2, preparing a precursor solution; 3, immersing the alumina by the precursor solution, drying, roasting and reducing to obtain the catalyst. According to the catalyst prepared by the invention, the activated carbon or activated alumina is used as a carrier, noble metal ruthenium and auxiliary metal element are loaded and highly dispersed on the carrier, and the granularity of ruthenium metal particles in the catalyst is 30nm-80nm. The prepared catalyst is suitable for catalytically hydrogenating pyridine compounds to synthesize piperidine compounds, the conversion rate of the catalytic hydrogenation reaction is high, and the production cost for the piperidine compounds can be greatly reduced.

Filter for removing impurity refrigerating cycle using refrigerant of hfc series

Abstract: PURPOSE:To adsorb and remove foreign materials and thereby to enable stable operation of a refrigerating cycle for a long period by constructing integrally a baked material of which the main constituent is activated carbon and a baked material of which the main constituents are activated alumina and synthetic zeolite. CONSTITUTION:A structure body 2 which is prepared by sintering activated carbon by using an appropriate binder and of which the gas permeation resistance is small and a structure body 3 which is prepared by sintering a mixture of activated alumina and synthetic zeolite by using an appropriate binder and of which the gas permeation resistance is small are combined with each other properly and they are provided in a refrigerating cycle by using components such as steel cases 4 and 5. As the result, contamination constituents produced from friction and abrasion of sliding components at the time of the use of a lubricating oil of ester series in a refrigerating cycle can be reduced.

Removal of arsenic from water via solar energy harvesting technique with integrated system of activated alumina absorbent bed and double slope solar still

Abstract: The present research article reports an experimental study on solar energy harvesting for the removal of arsenic (As) from water by using an integrated system of activated alumina absorbent bed along with double slope solar still complemented with numerical approaches of arsenic adsorption. During the investigation, arsenic contamination level was found between 90.23 ppb to 477.89 ppb which are exceeded the maximum acceptable limit of 10 ppb for drinking water as recommended by the Environmental Protection Agency. Results show that the mean arsenic concentrations in water samples were found in the order: Dubagga (90.23 ppb) < Gaughat (127.60 ppb) < Hanuman Setu (283.75 ppb) < Barrage (341.60 ppb) < Kukrail (322.54 ppb) < Mohan Meakin (477.89 ppb). It was found that the quantity of adsorbed arsenic was more for a higher initial concentration of arsenic. On the other side, the temperature (200C) and maximum adsorption (≈100 percent) obtained at a pH value of 8.4. The equilibrium condition has been achieved in 3 hr after conducting several experimental runs. The obtained experimental data have been analyzed and verified with suitable adsorption isotherms (Langmuir and Freundlich) which are also confirmed by the best-fit curve of experimental data.

Process for treating waste water containing fluorine

Abstract: PURPOSE:To efficiently remove borofluoride, fluoride ion, etc., in waste water by combining amino polyalcohol type chelate adsorbents with selective adsorbents of fluoride ions and adding them to the waste water. CONSTITUTION:Amino polyalcohol type chelate adsorbents combined with selective adsorbents of fluoride ions are added to fluorine waste water containing borofluoride produced in a metal plating process, fluoroboric acid synthesis process, etc., to effect treatment of said waste water so that borofluoride ions, fluoride ions and borate ions coexisting with each other are simultaneously, efficiently removed. As an example of said amino polyalcohol type chelate resins, there is 'Amberite IRA-743(R)' chelate resin, etc., which selectively adsorbs borate ions. As an example of fluoride ion adsorbents, activated alumina adsorbent, etc., are available.