Oxidative decomposition of organic pollutants by using persulfate with ferrous hydroxide colloids as efficient heterogeneous activator
Oxidative decomposition of organic pollutants by using persulfate with ferrous hydroxide colloids as efficient heterogeneous activator
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DOI：
10.1016/j.seppur.2012.12.012
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发表时间：
2013-03
影响因子：
8.6
通讯作者：
Jingchun Yan;Lihua Zhu;Zhihong Luo;Yanfei Huang;Heqing Tang;Mengfang Chen
中科院分区：
文献类型：
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作者：
Jingchun Yan;Lihua Zhu;Zhihong Luo;Yanfei Huang;Heqing Tang;Mengfang Chen
以过硫酸盐为氧化剂，氢氧化亚铁胶体为非均相活化剂，对有机污染物进行了降解研究。在pH为3.0时，在过硫酸盐（1.2mM）和氢氧化亚铁胶体（1.2mM）存在下，磺胺间甲氧嘧啶（SMM，0.06mM）在1 min内完全降解，表观速率常数高达2.21min-1，是Fe 2+离子（0.42min-1）的5.3倍。胶体活化剂也远远上级Fe 3 O 4纳米颗粒，后者被报道为过硫酸盐的良好活化剂，在类似条件下提供1.09min− 1的表观速率常数。过硫酸盐和亚铁氢氧化物胶体的组合也引起罗丹明B和4-硝基苯酚的有效降解，具有高的总有机碳（TOC）去除。胶体的高效活化作用归因于胶体颗粒具有大比表面积的固有性质，这同时增加了过硫酸盐的化学侵蚀可能性和有机污染物在胶体表面的吸附。该胶体具有高效的活化效果、制备和使用方便等优点，在过硫酸盐作为绿色氧化剂去除难降解有机污染物方面具有广阔的应用前景。
The degradation of organic pollutants was conducted by using persulfate as the oxidizing agent and ferrous hydroxide colloids as a heterogeneous activator. Complete degradation of sulfamonomethoxine (SMM, 0.06mM) was achieved within 1min in the presence of persulfate (1.2mM) and ferrous hydroxide colloids (1.2mM), and the apparent rate constant in this system was as high as 2.21min−1, being 5.3 times of that using Fe2+ion (0.42min−1) as the homogeneous activator at pH 3.0. The colloidal activator was also much superior to Fe3O4nanoparticles, which were reported as good activator of persulfate and provided an apparent rate constant of 1.09min−1under similar conditions. The combination of persulfate and ferrous hydroxide colloids also caused efficient degradation of Rhodamine B and 4-nitrophenol with high total organic carbon (TOC) removal. The highly efficient activation effect of the colloids is attributed to the intrinsic nature of colloid particles with large specific surface area, which simultaneously increase the chemical attack possibility of persulfate and the adsorption of organic pollutants on the colloidal surface. The highly efficient activation effect, easy preparation and use allow promising applications of the ferrous hydroxide colloids in removing recalcitrant organic pollutants with persulfate as green oxidizing agent.