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#1 2020-11-25 08:25:39

sakurajun
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Inscription : 2020-11-12
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Adsorption of perchlorate in water by granular activated carbon and im

Adsorption of perchlorate in water by granular activated carbon and impact factors analysisgranular activated carbon supplier

The adsorption of perchloric ion (ClO4-) on granular activated carbon (GAC) was studied in aqueous solution through batch experiments. The effect of pH, initial ClO4- concentration and co-existed anions on ClO4- adsorbed by GAC, adsorption kinetics and isothermal models were studied. The results show that the adsorption capacity of ClO4- on GAC decreases in the alkaline solution, and increases with the increasing initial concentration. The competitive adsorption exists between co-existed anions and ClO4- on GAC and the order of competitive effect is SO4(2-) > NO3- > CO3(2-) > H2PO4- > BrO3- approximately Cl-. The adsorption process follows pseudo-second order kinetics. The existed pore diffusion probably is the main rate-controlling step of adsorption process. In addition, adsorption of ClO4- on GAC fits the Langmuir, Freundlich and Tempkin isothermal models in the range of experimental concentration. The adsorption of ClO4- on GAC is spontaneous and exothermic, and the increase of temperature decreases the adsorption capacity. The maximum adsorption capacity is 13.00, 11.21 and 8.04 mg x g(-1) at the temperatures of 288, 298 and 308 K, respectivelyhttps://www.yrdactivatedcarbon.comAdsorption of ClO4- on GAC is favorable, but the reaction conditions, such as temperature, pH and co-existed concentration, should be controlled to improve the adsorption efficiency.

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