An experimental study on preparation of zinc-loaded activated carbon catalyst and its performance in coal chemical wastewater treatment
In order to improve the treatment efficiency of high-salt wastewater from coal chemical industry,two loading methods namely direct impregnation method and precipitation-calcinations method were adopted to prepare catalyst for ozone oxidation degradation process with coal-based activated carbon produced in Ningxia as the carrier,and zinc as the active component.The removal of COD in the high-salt wastewater from coal chemi-cal industry of Ningdong area of Ningxia was investigated,the results showed that the activated carbon was mixed with 0.4 mol/L zinc chloride solution at the ratio of m(activated carbon)∶V(solution)=1∶3,and then precipi-tated completely,under nitrogen protection,ZnO/AC catalyst with active component of zinc oxide was prepared by calcinations at a constant temperature of 300℃for 2 h,the specific surface area of the catalyst was 1 063.45 m2/g,the removal rate of COD was up to 71.7%.After the treatment,the concentration of Zn2+in the wastewater increased by 99.888 2 mg/L,the existence of high specific surface area was beneficial to the synergy of physical adsorption and chemical catalysis,and to improve the catalytic performance of activated carbon-based catalyst.The said ozone catalyst has remarkable catalytic effect and can be used for the removal of organic matters from high-salt wastewater of coal chemical industry.
activated carboncatalystozone catalytic oxidationspecific surface arearemoval rate of CODcoal chemical industryhigh-salt wastewater