PAN-DETA 섬유와 TiO-PAN 비드의 비소(As(V)) 흡착 성능 비교: 회분식 및 고정층 칼럼 실험

Comparative Arsenate (As(V)) Adsorption Performance of PAN-DETA Fibers and TiO-PAN Beads: Batch and Fixed-Bed Column Studies

This study compares the As(V) adsorption performance of aminated polyacrylonitrile fiber (PAN-DETA) and TiO2-immobilized PAN(TiO-PAN) beads to evaluate their suitability for continuous-flow water treatment. Batch tests examined the effects of pH, competing ions, adsorption isotherms, and kinetics, while fixed-bed experiments assessed breakthrough behavior and regeneration performance. PAN-DETA fiber maintained stable adsorption at pH 3.5–6.0, whereas TiO2 nanoparticles remained effective across a broader pH range (2.0–7.0). Both materials followed the Langmuir isotherm, with PAN-DETA fiber exhibiting a substantially higher maximum capacity (256.4 mg/g) than TiO2 nanoparticles (43.9 mg/g). Pseudo-second-order kinetics best described the adsorption process, and PAN-DETA showed markedly faster uptake than TiO-PAN beads. Intraparticle diffusion analysis indicated that PAN-DETA fiber adsorption was dominated by surface interaction, while TiO-PAN beads involved both surface and pore diffusion. In fixed-bed systems, PAN-DETA fiber achieved a breakthrough capacity of 189.15 mg/g, far surpassing TiO-PAN beads (11.16 mg/g). Bohart–Adams modeling predicted 960 bed volumes (BV) to meet the 0.01 mg/L standard for PAN-DETA fiber, compared with 77 BV for TiO-PAN beads. Normalized evaluations showed approximately 78-fold higher treatment capacity for PAN-DETA fiber. Regeneration tests further demonstrated its high reversibility (>99%) using small volumes of 0.1 M HCl, whereas TiO-PAN beads required larger volumes of NaOH. Overall, the results demonstrate that PAN-DETA fiber provides superior adsorption capacity, faster kinetics, higher selectivity, and more efficient regeneration compared with TiO2-based adsorbents, indicating its strong potential for practical application in continuous arsenic treatment processes.