本研究透過合成氮化硼(BN)及以氮化硼作為基板利用異原子摻雜使其在長波長下具有光催化降解水中全氟辛酸(PFOA)之活性，並探討以不同酸活化BN及氯離子添加於加速BN之光催化活性。在中性環境下，利用UVC 254 nm光源，未經酸洗之BN在60分鐘僅降解 10% PFOA ( 10 mg/L)，一階反應速率為0.0018 min-1，利用1 N HCl活化之BN (BN_HCl) 可在60分鐘達成100% PFOA降解率，一階反應速率為0.0337 min-1，利用1 N H2SO4 活化之BN (BN_H2SO4) 則降解PFOA大約90%，一階反應速率為0.0208 min-1此外添加1mM NaCl，可使BN_HCl及BN_H2SO4在30分鐘內達100%PFOA，一階反應速率分別為0.0548 min-1及0.0406 min-1。而硫原子摻雜氮化硼(SSBN及TSBN)則是在酸性環境可以UVA 360 nm光源驅動，在120分鐘內降解25% PFOA，而BN則無反應添加1 mM NaCl，則可提升至35%，而提升至3 mM NaCl，更提升至45%。推測PFOA降解主要是因為電洞 (h+)和超氧自由基( O2•- )的出現，而氯離子加速效應，推測可能是氯離子被生成之自由基氧化為氯自由基，而加速PFOA降解的原因。而硫原子的摻雜可提升BN在長波長下的光催活性可能是因為氮化硼層間距離縮小，進而可以吸收較長波長的光，而造成PFOA的降解。

This study aimed to investigate the heteroatom sulfur doping of boron nitride and the effects of acid activation of BN by HCl versus H2SO4 and the addition of Cl- on the photocatalytic degradation of perfluorooctanoic acid (PFOA) in water.. The results indicate that at neutral pH, as-synthesized BN only photodegraded 10% of PFOA (10 mg/L) in 60 min under UV 254 nm light. The acid activation of BN by 1 N HCl (BN_HCl) achieved~100% PFOA removal in 60 min, while that activated with 1 N H2SO4 (BN_H2SO4) photodegraded approximately 90% of PFOA. Adding 1 mM NaCl significantly increased the photocatalytic efficiency of BN to achieve ~100% PFOA removal in 30 min over BN_HCl and BN_H2SO4. The doping of sulfur heteroatom into BN (SSBN and TSBN) allowed less energetic UVA 360 nm light to drive the 25% photocatalytic degradation of PFOA in 120 min under acidic conditions in contrast to BN that was inactive. Adding 1 mM NaCl increased the photocatalytic degradation of PFOA over S-doped BN to 35% within 120 min, and 3 mM NaCl further increased the removal of PFOA to 45%. We inferred that the photocatalytic degradation of PFOA over BN is primarily driven by valence band holes (h+) and superoxide radicals (O2•-). Chloride ions accelerated the rates, possibly due to the reactive chlorine radicals formed via the oxidation of Cl- by BNs. The doping of sulfur atoms enabled the photocatalysis of PFOA over BN utilizing longer wavelength UVA light, possibly due to the shrunk bandgap.

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