Tu Mengxin, Chen Lei, Gu Jianzhong, Mao Chengkai, Ren Yingfei, Wang Hongyong, Xu Gang
School of Environmental and Chemical Engineering, Shanghai University 99 Shangda Road Shanghai 200444 PR China
Shanghai, University, Shanghai Institute Applied Radiation 20 Chengzhong Road Shanghai 200444 PR China.
RSC Adv. 2024 Dec 9;14(52):38815-38826. doi: 10.1039/d4ra04993d. eCollection 2024 Dec 3.
As a common heavy metal complex in industrial wastewater, Pb-EDTA has garnered much attention due to its detrimental impact on both human health and the ecological environment. The degradation of heavy metal complexes by traditional methods requires subsequent treatment to recover heavy metals. This article attempts to find an effective method to simultaneously degrade both organic matter and heavy metal pollutants. Experimental results indicate that 1 mM Pb-EDTA can be effectively removed at 10 kGy with a degradation efficiency of 91.62%. Most lead ions were still in a stable complex state, with a removal rate of 24.42% (10 kGy). When the absorbed dose increased to 80 kGy, the degradation efficiency of Pb-EDTA was 95.24%. At this time, the removal rate of Pb reached 68.82%. Through radical scavenging experiments and further mechanism analysis, it was demonstrated that electron beam irradiation primarily generates ·OH radicals, disrupting the structure of Pb-EDTA, gradually decarboxylating, and ultimately generating formic acid, acetic acid, and NO . The released metal ions were reduced by e and ·H to obtain lead monomers. Residual toxicity analysis indicates that the toxicity of degradation products generated by electron beam irradiation is significantly reduced. Experimental results showed that electron beam irradiation can effectively degrade Pb-EDTA and recover lead ions simultaneously.
作为工业废水中常见的重金属络合物，Pb-EDTA因其对人类健康和生态环境的有害影响而备受关注。传统方法降解重金属络合物后需要后续处理来回收重金属。本文试图找到一种同时降解有机物和重金属污染物的有效方法。实验结果表明，1 mM的Pb-EDTA在10 kGy时可被有效去除，降解效率为91.62%。大多数铅离子仍处于稳定的络合状态，去除率为24.42%（10 kGy）。当吸收剂量增加到80 kGy时，Pb-EDTA的降解效率为95.24%。此时，Pb的去除率达到68.82%。通过自由基清除实验和进一步的机理分析表明，电子束辐照主要产生·OH自由基，破坏Pb-EDTA的结构，逐渐脱羧，最终生成甲酸、乙酸和NO。释放出的金属离子被e 和·H还原得到铅单体。残留毒性分析表明，电子束辐照产生的降解产物毒性显著降低。实验结果表明，电子束辐照可以有效降解Pb-EDTA并同时回收铅离子。
