Increasing phosphate sorption on barium slag by adding phosphogypsum for non-hazardous treatment.

摘要: Abstract Barium slag (BS) is a waste residue in the barium salt industrial procedure. Due to its high leaching concentration of Ba2+, BS classified as kind hazardous waste. Industrial phosphogypsum (PG) effective immobilize ion owing slightly soluble sulfate included. In this study, two different proportions PG were selected for mixing with solidify ion. The non-hazardous samples treated (BS-PG1, BS-PG3) then functionally used phosphate removal solution. Batch experiments performed evaluate adsorption efficiency BS-PG1 and BS-PG3. effect various factors such contact time, initial pH, reaction temperature on sorption performance was investigated. BS-PG3 reached equilibrium approximately 3h at 15 mg/L, exhibited capacity 12.47 mg P/g, higher than that (11.49 mg P/g) under condition solid:liquid, 1g:1L, 25 °C, natural pH. results show processes phosphates ions onto both fitted well pseudo-second-order kinetic model. Langmuir isothermal model considered appropriate equation experimental data, showing maximum up 13.67 mg P/g 11.59 mg P/g comparison other adsorbents, could be efficient materials phosphate.