Synthesis of surface modified ceramsite from waste material and its application for phosphate removal from aqueous solutions

A novel ceramsite (MMSC) material was synthesised for phosphate removal from Municipal Solid Waste incineration bottom ash (MSWIBA) and Molybdenum tailings (MoT) as precursors with shell powders (SP) an additive. The optimal process conditions important parameters are the mass ratio of MSWIBA to MoT calcination temperature. effects addition SP on composite (MMS) resultant characterised in terms their apparent porosity compressive strength. temperature phosphorus adsorption capacity established MMSC. optimum synthesis MMSC were follows: MMS ratio, 4:6:0.9; preheating temperature, 700°C; time, 30 min; calcining 1040°C; 25 min. MSSC is subjected surface modification treatment Ca(OH)2. surface-modified MMSC, denoted Ca-OC, exhibits a four-fold higher compared virgin (MMSC). Its isotherms generated over 45°C. Langmuir model pseudo-second-order fit sorption adequately, demonstrate chemical monolayer dominated process. Ca-OC prepared under condition, had strength 1.29 MPa, 42.2%, theoretical maximum 7.79 mg/g at X-ray diffraction analysis adsorbed show that reaction between Ca2+ PO43-, which forms hydroxyapatite (Ca5(PO4)3(OH)), main mechanism removal.