摘要：

以传统活性炭（AC）粒子电极为载体，采用溶胶-凝胶法制备TiO₂/AC粒子电极以及掺N、掺Mn、N-Mn共掺杂改性的TiO₂/AC粒子电极，并将几种粒子电极应用于三维光电系统，考察其对实际印染废水的处理性能。XRD表征结果表明，TiO₂成功负载于AC表面且以锐钛矿晶型为主，N元素并未取代晶格氧，而是进入TiO₂晶格间隙，加快了电荷转移，Mn元素则以间隙掺杂形式进入TiO₂晶格，加快了光生空穴（h⁺）的转移；SEM、EDS和FT-IR结果显示，相比TiO₂/AC粒子电极，N-Mn-TiO₂/AC粒子电极比表面积显著增大，含氧官能团明显增加；印染废水降解实验结果表明，当实际印染废水中COD、NH₄ ⁺-N、TN分别为1 600~1 800、25~40、40~60 mg/L时，N-Mn-TiO₂/AC三维光电体系对COD、NH₄ ⁺-N、TN的去除率分别为82.9%、93.7%、89.5%，废水处理能耗11.92 kW·h/m³；与TiO₂/AC、N-TiO₂/AC、Mn-TiO₂/AC光电体系相比，N-Mn-TiO₂/AC光电体系对COD的去除率分别提高了72.0%、19.8%、12.2%，对NH₄ ⁺-N的去除率分别提高了79.2%、18.2%、7.2%，对TN的去除率分别提高了83%、17.9%、8.4%，而体系能耗分别降低了65.4%、61.5%、41.1%。

关键词: 活性炭, 粒子电极, 掺杂TiO₂, 三维光电体系, 印染废水

Abstract:

TiO₂/AC particle electrode and N-doped，Mn-doped and N-Mn co-doped TiO₂/AC particle electrodes were prepared by sol-gel method using the traditional activated carbon（AC） particle electrode carrier. Several particle electrodes were applied to the three-dimensional photoelectric system to investigate their treatment performance on actual printing and dyeing wastewater. XRD results showed that TiO₂ was successfully supported on the surface of AC and was mainly anatase crystal type. N element didnʼt replace lattice oxygen，but entered the TiO₂ lattice gap，speeding up the charge transfer. Mn element entered the TiO₂ lattice in the form of gap doping，speeding up the transfer of photogenerated holes（h⁺）. SEM，EDS and FT-IR results showed that compared with TiO₂/AC particle electrode，the specific surface area of N-Mn-TiO₂/AC particle electrode was significantly increased，and the oxygen-containing functional group was significantly increased. The experimental results showed that when the COD_Cr，NH₄ ⁺-N and TN in the actual printing and dyeing wastewater were 1 600-1 800，25-40 and 40-60 mg/L respectively，the removal rates of COD，NH₄ ⁺-N and TN in the N-Mn-TiO₂/AC three-dimensional photoelectric system were 82.9%，93.7% and 89.5%，respectively and the energy consumption was 11.92 kW·h/m³. Compared with the TiO₂/AC，N-TiO₂/AC and Mn-TiO₂/AC photoelectric systems，N-Mn-TiO₂/AC photoelectric system increased COD removal rate by 72.0%，19.8% and 12.2%，NH₄ ⁺-N removal rate by 79.2%，18.2% and 7.2% and TN removal rate by 83%，17.9% and 8.4%，respectively. The energy consumption of the system was reduced by 65.4%，61.5% and 41.1%，respectively.

Key words: activated carbon, particle electrode, doped TiO₂, three dimensional photoelectric system, printing and dyeing wastewater

中图分类号: 

• TQ028.8

• X703.1