School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China.
J Hazard Mater. 2019 Dec 15;380:120892. doi: 10.1016/j.jhazmat.2019.120892. Epub 2019 Jul 12.
Alkylation reaction catalyzed by concentrated HSO generates hazardous waste HSO containing a large amount of organic pollutants. This study focused on effective utilization and treatment of the waste HSO for simultaneous consumption of HSO and deep oxidative degradation of the organics. The waste HSO could completely react with magnesium oxide ore to prepare crude MgSO solution, and the organic pollutants in the solution were deeply degraded and mainly mineralized to HO and CO with HO as oxidant and sugarcane bagasse citrate (SBC), a kind of lignocellulose ester, as catalyst. The total amount of acidic groups of SBC significantly affected its catalytic activity, attributing to that these oxygen-containing functional groups adsorbed and immobilized metal ions on SBC to form catalytic active sites, which could activate and catalyze HO to generate •OH and HO• radicals for effective degradation of the organics. The resulting purified MgSO solution with color removal of 93.71% and total organic carbon removal of 85.89% under optimum catalytic reaction conditions was used to produce qualified MgSO∙7HO product. These results highlighted the feasibility of using lignocellulose ester as effective catalyst for deep oxidative degradation of hazardous organic pollutants.
浓 HSO 催化的烷基化反应会生成含有大量有机污染物的危险废物 HSO。本研究着眼于有效利用和处理这种废物 HSO，以实现 HSO 的完全消耗和有机污染物的深度氧化降解。该废物 HSO 可与氧化镁矿石完全反应，制备粗 MgSO 溶液，溶液中的有机污染物被深度降解并主要矿化为 HO 和 CO，HO 用作氧化剂，而以蔗渣柠檬酸酯（SBC）作为催化剂。SBC 的总酸性基团对其催化活性有显著影响，这归因于这些含氧官能团吸附和固定 SBC 上的金属离子，形成催化活性位点，从而可激活和催化 HO 生成•OH 和 HO•自由基，以有效降解有机污染物。在最佳催化反应条件下，得到的纯化 MgSO 溶液的脱色率为 93.71%，总有机碳去除率为 85.89%，可用于生产合格的 MgSO·7HO 产品。这些结果突出了利用木质纤维素酯作为有效催化剂深度氧化降解危险有机污染物的可行性。
