State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering , Harbin Institute of Technology , Harbin 150090 , China.
Technology R & D Center for Environmental Engineering , Dongguan University of Technology , Dongguan 523808 , China.
Environ Sci Technol. 2018 Nov 20;52(22):13325-13335. doi: 10.1021/acs.est.8b01718. Epub 2018 Nov 5.
Many investigations focused on the capacity of ferrate for the oxidation of organic pollutant or adsorption of hazardous species, while little attention has been paid on the effect of ferrate resultant nanoparticles for the removal of organics. Removing organics could improve microbiological stability of treated water and control the formation of disinfection byproducts in following treatment procedures. Herein, we studied ferrate oxidation of p-arsanilic acid ( p-ASA), an extensively used organoarsenic feed additive. p-ASA was oxidized into As(V), p-aminophenol ( p-AP), and nitarsone in the reaction process. The released As(V) could be eliminated by in situ formed ferric (oxyhydr) oxides through surface adsorption, while p-AP can be further oxidized into 4,4'-(diazene-1,2-diyl) diphenol, p-nitrophenol, and NO. Nitarsone is resistant to ferrate oxidation, but mostly adsorbed (>85%) by ferrate resultant ferric (oxyhydr) oxides. Ferrate oxidation (ferrate/ p-ASA = 20:1) eliminated 18% of total organic carbon (TOC), while ferrate resultant particles removed 40% of TOC in the system. TOC removal efficiency is 1.6 to 38 times higher in ferrate treatment group than those in O, HClO, and permanganate treatment groups. Besides ferrate oxidation, adsorption of organic pollutants with ferrate resultant nanoparticles could also be an effective method for water treatment and environmental remediation.
许多研究都集中在高铁酸盐氧化有机污染物或吸附有害物种的能力上，而很少关注高铁酸盐生成的纳米颗粒对去除有机物的影响。去除有机物可以提高处理水的微生物稳定性，并控制后续处理过程中消毒副产物的形成。在此，我们研究了高铁酸盐氧化对氨基苯砷酸（p-ASA）的作用，p-ASA 是一种广泛使用的有机胂饲料添加剂。在反应过程中，p-ASA 被氧化成 As(V)、对氨基酚（p-AP）和硝砜。释放的 As(V) 可以通过原位形成的铁（氧）氢氧化物通过表面吸附去除，而 p-AP 可以进一步氧化成 4,4'-(二氮烯-1,2-二基)二苯酚、对硝基苯酚和 NO。硝砜对高铁酸盐氧化具有抗性，但主要被高铁酸盐生成的铁（氧）氢氧化物吸附（>85%）。高铁酸盐氧化（高铁酸盐/ p-ASA = 20:1）去除了 18%的总有机碳（TOC），而高铁酸盐生成的颗粒在系统中去除了 40%的 TOC。与 O、HClO 和高锰酸盐处理组相比，高铁酸盐处理组的 TOC 去除效率高 1.6 到 38 倍。除了高铁酸盐氧化，用高铁酸盐生成的纳米颗粒吸附有机污染物也是水处理和环境修复的有效方法。
