关键词: 酸化污泥膨润土颗粒, 硫酸, 酸活化, 活性翠兰, 脱色

Abstract: Taking sludge as pore-forming agent, the optimized conditions for preparation and acidification of bentonite granules were investigated. The effects of calcination temperature, roasting time and sludge content on the porosity of granules were investigated to obtain porous samples with better mechanical strength, which were further treated with sulphuric acid activation. By altering acid type, acid concentration, ratio of liquid to solid, activation temperature and activation time, the acid activated bentonite granular adsorbent with better decoloration properties was obtained and characterized in specific surface area, lost ratio, water absorption and morphology. The results indicate that the optimal preparation conditions of porous bentonite granules are calcination temperature 700℃, calcination time 7 h, and mass ratio of sludge to bentonite 1:3. And the granules are acidized by the sulphuric acid of 6 mol/L to react for 4 h at ambient temperature and ratio of H2SO4 to granules 25 mL/g. The decoloration rate of Turquoise Blue by the prepared granules reaches 47% in 2 h, which is more excellent than that of other three granular adsorbents, irregular carbons, cylindrical carbons and raw material.

Key words: acid sludge-bentonite granule, sulfate acid, acid-activation, Reactive Turquoise Blue, decolorization