Synthesis of a faujasite type of zeolite from Paper Sludge Ash and its acetaldehyde adsorption
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In view of recycling and environmental conservation, faujasite type zeolite was synthesized from paper sludge (PS) discharged from a paper-mill as an industrial waste of paper manufacturing processes. Main chemical components of the PS after burning (PS ash) were Al<SUB>2</SUB>O<SUB>3</SUB> (66.1%), SiO<SUB>2</SUB> (14.4%), TiO<SUB>2</SUB> (11.5%) and MgO (7.5%), and talc, anatase, and amorphous aluminum hydroxides were identified. The PS ash (10 g) was mixed with NaOH (12 g) and water (100 g), and kept boiling for 24 h: this process was aimed to dissolve out Al from the PS ash. After cooling, water glass (SiO<SUB>2</SUB>: 28.5%, Na<SUB>2</SUB>O: 9.3%, H<SUB>2</SUB>O: 62.2%) was added and allowed to stand for 24 h (aging process). After aging, the content was again kept boiling for 24 h to obtain faujasite type zeolite. The obtained Na-saturated faujasite (Na-F) had lattice constant of a=24.927 indicating X-type faujasite (SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>=2.62), and the yield was estimated as about 66%. Acetaldehyde adsorption experiment was carried out on Na-F and Ca-F (Ca saturated faujasite): 0.05 g of each faujasite sample was spread to 6.5 cm<SUP>2</SUP> in a 200 mL of closed vessel, and acetaldehyde was introduced to be 1000 ppm. After 80min, acetaldehyde concentration decreased to 444 ppm (Na-F) and 189 ppm (Ca-F), indicating higher adsorption ability of Ca-F than that of Na-F. This shows that calcium ion bound to faujasite has higher bonding force to acetaldehyde than sodium ion bound to faujasite. It was suggested that the zeolites synthesized using from PS ash would have enough ability for the removal of toxic gases in atmospheric environment.
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