based on the breakthrough curves of the adsorbates.

3.6. The Recycle of Disabled Adsorbent {#sec3dot6-polymers-12-00289}
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After treating the simulated textile wastewater, the particle surfaces of the mixture adsorbent composed of CCSP and AC would gather a large amount of starch, PVA, and dyes. It was difficult to be regenerated by the conventional desorption methods. In order to avoid producing solid waste, a chemical activation process was carried out to convert these disabled adsorbents into regenerated activated carbon. The SEM images of the original activated carbon (AC) and the regenerated activated carbon (RAC) that came from the disabled mixture adsorbent composed of CCSP2 and AC (mass ratio of 1:1) are shown in [Figure 8](#polymers-12-00289-f008){ref-type="fig"}. As can be seen from [Figure 8](#polymers-12-00289-f008){ref-type="fig"}, significant differences in the morphology of the RAC and AC were observed. The average particle size of the RAC was obviously smaller than that of the AC, and some honeycomb-shaped porous carbons were developed after carbonization. The Brunauer-Emmett-Teller (BET) data (see [Table 4](#polymers-12-00289-t004){ref-type="table"}) showed that the RAC had a larger surface area and pore volume than that of AC. This result indicated that the starch and PVA in CCSP2 should be converted into biomass carbon and porous carbon after carbonization \[[@B47-polymers-12-00289],[@B48-polymers-12-00289]\]. It is worth mentioning that the adsorption capacity of RAC on the simulated textile wastewater was higher than that of the original activated carbon, no matter whether used alone or in combination with CCSP2 (see [Figure 9](#polymers-12-00289-f009){ref-type="fig"}). This result indicated that the mixture adsorbent composed of CCSP2 and AC exhibited the advantages of a high adsorption capacity, recycling ability, and no solid waste when it was used as the adsorbent of the fixed-bed to treat the simulated textile wastewater.

4. Conclusions {#sec4-poly