Research on the Modification Method and Modification Conditions of Natural Zeolite
Based on natural clinoptilolite after pretreatment then used of hydrochloric acid(HCl),sodium chloride(NaCl),ammonium chloride(NH4Cl),sulfuric acid(H2SO4),hexadecyltrimethylammonium bromide(HDTMA),acetic acid(CH3COOH),sodium hydroxide(NaOH)for 7 different modification methods,to seek out the best modified method,obtained by the different types of modified zeolite.The experimental results show that with hexadecyltrimethylammonium bromide(HDTMA)modified zeolite is the highest removal rate of heavy metal Cd2+,so choose HDTMA as modified agents to prepare modified zeolite and HDTMA modifier solution concentration,zeolite immersion time,solid-liquid ratio(modifier solution volume and the quality of zeolite),calcination temperature influence the quality of the modified zeolite potential factors.Obtains the best modified zeolite adsorbent preparation conditions is:HDTMA solution concentration of 5 g/L,zeolite immersion time for 12 h,HDTMA solid-liquid ratio is 10(mL : g),the optimum calcination temperature of 500℃.
environmental engineeringnatural clinoptilolitemodification methodmodification conditionsheavy metal Cd2+
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