椰壳成熟度对衍生活性炭吸附金效率的影响

W. Buah, J. Darmey, F. Osei
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摘要

摘要以椰子壳为原料制备活性炭。蛋壳的成熟度可能有所不同。研究了壳层成熟度对衍生活性炭在金二氰溶液中吸附金效率的影响。将壳在900℃下进行热解,并在相同温度的蒸汽中活化不同时间。对衍生ACs的性质评估表明;活性炭的硬度、金吸附能力和金吸附速率与壳的成熟度有关。椰壳越成熟,AC越硬。成熟椰壳活性炭的相对硬度和金吸附率依次为HM >HL和RM >RL。活化3 h后,成熟壳和不成熟壳的相对硬度分别为99.3%和94.0%,金吸附率分别为5.78 mg Au/hr/g和4.95 mg Au/hr/g。活性炭的吸附速率和相对硬度与活化时间有关,活化时间越长,吸附速率越高,相对硬度越低。关键词:吸附,活性炭,椰子壳,成熟度,相对硬度
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Effects of Maturity of Coconut Shells on Gold Adsorption Efficiencies of Derived Activated Carbons
AbstractCoconut shells are used as precursors for preparation of activated carbons. The shells could vary in terms of their maturity. The influence of the maturity of the shells on gold adsorption efficiencies of derived activated carbons (ACs) from gold di-cyanide solution was investigated. The shells were pyrolysed at 900 ºC and the resulting chars were activated in steam at the same temperature for different durations. Assessment of the properties of the derived ACs revealed that; the hardness, gold adsorption capacities and rates of gold adsorption of the ACs depended on the maturity of the shells. The more matured the shells the harder the AC. The relative hardness and gold adsorption rates of the mature coconut shells activated carbons, HMand RM, respectively and those of the less mature shells, HLand RL, respectively were in the order of HM >HL and RM >RL. The relative hardness of the ACs derived from the more mature and less mature shells after 3 hrs activation were 99.3% and 94.0%, respectively and the gold adsorption rates were 5.78 mg Au/hr/gand 4.95 mg Au/hr/g, respectively. The adsorption rates and relative hardness depended on the duration of activation, where longer activation times resulted in increase in the adsorption rates and a decrease in relative hardness of the derived ACs. Keywords: Adsorption, Activated Carbon, Coconut Shells, Maturity, Relative Hardness
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