[en] In order to accelerate the regeneration, steam and easily desorlable substances are first removed at 100⁰C from the activated carbon. This is followed by treatment with one or several solvents such as a mixture of, e.g., N- methyl-2-pyrrolidone (NMP) and triethanol amine (TEA) or 2-pyrrolidone, NMP and TEA. These solvents can then be blown out by inert gases at high temperatures of 200⁰C, at which the solvents do not decompose. (DG)

[en] The absorbing capacity of activated carbon can be considerably improved upon by heating in an inert atmosphere to 50-300⁰C and then quenching to below -66⁰C. The method is explained in 18 examples. The quenching takes place by cooling with indirect heat exchange on the wall of a cooling chamber, the treated coal thus maintains its hardness and does not break. (UWI)

No abstract available

[en] Activated carbon is produced from carbonaceous source materials by a complex physicochemical process. It is extensively used as a high adsorptive product for purification, deodorization, and decolorization in the chemical industry and in drinking water treatment plants. In 2017, the global activated carbon market accounted for $4 billion and is expected to reach $14.21 billion by 2026.

[en] There are two reasons for measurement of radon concentration. On one hand, it causes grave health hazards to not only uranium miners but also people living in normal houses and buildings. On the other hand it helps in mineral exploration, earthquake prediction, study of volcanic activities, and search for geothermal energy sources. In this paper we have investigated possibilities of radon detection using passive detectors based on domestic industry activated charcoal and their relative detection efficiency is determined in comparison to commercial EPA detector. Also, minimum detectable activity for measuring radon is determined, effect on water gain, exposure time and counting efficiency. (author)

[en] We propose a recycling system that can recover the useful water from the spent water soluble coolant by using a surfactant and powdered activated carbon. The processing of about 70 liters of actual spent water soluble coolant yielded about 60 liters of clear water with 6.7 of pH and 0.0 of Brix value. About 120 liters of recycle water-soluble coolant was prepared by diluting an emulsion type cutting fluid 20 times with the recycle water. The recycle coolant has been showing the very similar Brix value and pH changes as those of virgin coolant until 100 days usage. The recycle coolant also showed the same potential to inhibit the progress of flank wear as that of virgin coolant. These facts indicate that the recycled water can be utilized as a dilutor of renewal water-soluble coolant

[en] This invention relates to a rechargeable particulate filter for adsorption of radioactive contamination from a nuclear containment structure in the event of a nuclear power plant design basis or loss of coolant accident. More particularly, this invention relates to a rechargeable charcoal filter which permits loading and unloading of the particulate granules while limiting exposure of personnel to radioactivity. The present invention could also be utilized in heating and air conditioning systems. (author)

[en] An ambient xenon sampling system using Ag/ZSM-5 was designed, and its performance was tested. The xenon collection efficiency of the system was tested for 3 h and 6 h sampling times with air sampling flow rates between 70 and 140 SLPM. As a result, the maximum collection efficiency and xenon volume were estimated to be 102 ± 4% for 3 h sampling at 70 SLPM and 3.01 ± 0.11 cm³ for 6 h sampling at 137 SLPM, respectively. The xenon collection efficiency of Ag/ZSM-5 at 6 h sampling time was approximately 5 times higher than activated carbon under the same sampling conditions. (author)

[en] Radon has lately been very closely studied because it is popularly believed that large inhalation of it can cause cancer. Hence radon measurement has assumed great prominence in many institutions, especially in developed countries. This report presents a simple and practical method of measurement of Radon gas by a passive detector using activated charcoal. This method was pioneered by Environmental Measurement Laboratory (EML), New York, which has a very good Radon calibration facility. (author)

[en] An efficient SnO/activated carbon (AC) photocatalyst was successfully synthesized by using a simple ultrasonic reaction method. The visible light photocatalytic performance of SnO/AC composites was studied by evaluating the degradation of methyl orange (MO). The influence of the AC content on the composition, microstructure, and photocatalytic performance of the composite was investigated. The addition of AC may significantly improve the visible-light absorption of SnO. Compared with the SnO sample, the SnO/AC composites exhibited significantly enhanced visible-light photocatalytic performance. SnO/3%AC composite showed the best visible photocatalytic properties, which can degrade 97.6% of MO (40 mg l⁻¹) within 80 min. (paper)