King Abdulaziz City for Science and Technology-KACST, Nuclear Science Research Institute-NSRI, National Center for Irradiation Technology-NCIT, P. O. BOX 6086, Riyadh, 11442, Saudi Arabia; King Abdulaziz City for Science and Technology-KACST, Innovation and Industrialization Affairs, Saudi-Chinese Center for Technology Transfer-SCCTT, P. O. BOX 6086, Riyadh, 11442, Saudi Arabia.
Chemosphere. 2019 Aug;228:769-777. doi: 10.1016/j.chemosphere.2019.04.087. Epub 2019 Apr 26.
As sulfonated aromatic compounds are widely used in industry, they have frequently been detected in aquatic environments. This study evaluated the degradation and mineralization of 2,6-naphthalenedisulfonic acid disodium salt (2,6-NS), sodium 2-naphthalenesulfonate (2-NS), benzenesulfonic acid sodium salt (BS), and 4-vinylbenzene sulfonate sodium (4-VBS) by exposing aqueous solutions of these compounds to Co60 irradiation. The radiolytic degradation of these pollutants was found to follow pseudo-first-order kinetics. The dose required to achieve 90% degradation (D90) of these four sulfonated compounds was 0.480 (2,6-NS), 0.390 (2-NS), 0.194 (BS), and 0.280 kGy (4-VBS). The chemical radiolytic yield (G) decreased as the absorbed dose increased; moreover, the chemical structures of these compounds affected their radiolytic efficacy. No significant reduction in radiolytic degradation was observed in the presence of inorganic anions (SO, Cl). The radiolytic degradation efficiency was higher when hydrogen peroxide (HO, a hydroxyl radical (OH) promoter) was added. The results also showed that combining HO, persulfate anions (SO, a sulfate radical anion (SO) promoter), or NO gas (a OH radical promoter) with the sulfonated compounds enhanced the radiolytic mineralization yield and process by reducing the required irradiation energy. In terms of the Co60/O system, at an absorbed dose of 12 kGy, the total organic carbon (TOC) removal efficiency was almost 70%, resulting in the observed release of SO anions. In addition, the concentration of dissolved oxygen decreased and the pH was lowered. Based on these results, irradiation with Co60 was found to be a useful tool to remedy wastewater containing sulfonated aromatic compounds.
由于磺化芳香族化合物在工业中被广泛应用，因此它们经常在水环境中被检测到。本研究通过 Co60 辐照评估了 2,6-萘二磺酸二钠盐（2,6-NS）、2-萘磺酸钠（2-NS）、苯磺酸钠（BS）和 4-乙烯基苯磺酸钠（4-VBS）的降解和矿化作用。这些污染物的辐射降解遵循准一级动力学。要使这四种磺化化合物达到 90%降解（D90）所需的剂量分别为 0.480（2,6-NS）、0.390（2-NS）、0.194（BS）和 0.280 kGy（4-VBS）。化学辐射产率（G）随着吸收剂量的增加而降低；此外，这些化合物的化学结构影响它们的辐射效率。在存在无机阴离子（SO、Cl）时，没有观察到辐射降解的显著减少。当添加过氧化氢（HO，羟基自由基（OH）促进剂）时，辐射降解效率更高。结果还表明，将 HO、过硫酸盐阴离子（SO，硫酸盐自由基阴离子（SO）促进剂）或 NO 气体（OH 自由基促进剂）与磺化化合物结合，通过降低所需的辐照能，提高了辐射矿化产率和过程。就 Co60/O 体系而言，在吸收剂量为 12 kGy 时，总有机碳（TOC）去除效率几乎达到 70%，导致观察到 SO 阴离子的释放。此外，溶解氧浓度降低，pH 值降低。基于这些结果，发现 Co60 辐照是修复含有磺化芳香族化合物废水的有用工具。
