Abstract
AbstractA novel porous ceramsite was made of municipal sludge, coal fly ash, and river sediment by sintering process, and the performance of batch and fixed-bed column systems containing this material in the removal of acid red G (ARG) dye from aqueous solutions was assessed in this study. The results of orthogonal test showed that sintering temperature was the most important determinant in the preparation of porous ceramsite, and it possesses developed pore structure and high specific surface area. Batch experiment results indicated that the adsorption process of ARG dye toward porous ceramsite was a spontaneous exothermic reaction, which could be better described with Freundlich–Langmuir isotherm model (R2 > 0.992) and basically followed the pseudo-first-order kinetic equation (R2 > 0.993). Column experiment results showed that when the porous ceramsite was used as packing material, its adsorption capacity was roughly improved by 3.5 times compared with that in batch system, and the breakthrough behavior was simulated well with Yoon–Nelson model, with R2 > 0.954. This study suggested that the novelty man-made porous ceramsite obtained from solid wastes might be processed as a certain cost-effective treatment material fit for the dye removal in aqueous solutions.
Highlights
Ceramsite is a typical porous material, which has many applications in the fields of architecture industry, landscaping area, environmental protection, and so on [1,2,3], mainly because of its high porosity, large pore diameter, good chemical stability, and sufficient mechanical strength [4,5]
A novel porous ceramsite was prepared from solid wastes by sintering process, and its batch and fixed-bed column performances for acid red G (ARG) dye removal from aqueous solutions were studied
Under the optimal condition of preparation (0.1 wt% polyvinyl alcohol (PVA) additive, preheating at 400°C for 30 min, and sintering at 1,150°C for 7 min), the porous ceramsite can be prepared from municipal sludge, coal fly ash, and river sediment, with exhibits developing pore structure and high specific surface area
Summary
Ceramsite is a typical porous material, which has many applications in the fields of architecture industry, landscaping area, environmental protection, and so on [1,2,3], mainly because of its high porosity, large pore diameter, good chemical stability, and sufficient mechanical strength [4,5]. There are two major preparation processes of ceramsite, such as high-temperature sintering method and sintering-free method [6,7]. Among them, the former has attained widespread application, whereas the latter remains in the stage of technical improvement. It is a routine to use irreplaceable objects represented by clay and shale as a key raw material in the production of ceramsite [8,9]. It emphasizes the necessity to apply new raw materials in place of irreplaceable objects
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