毛珺,黄河,莫慧敏,陈俊先,黄丹,刘栩彤,张超兰,覃朝科.真空紫外辐照法降解水中丁基黄原酸钾的影响因素及动力学模型[J].环境科学学报,2020,40(9):3233-3240
真空紫外辐照法降解水中丁基黄原酸钾的影响因素及动力学模型
- Influencing factors and kinetic model of the degradation of potassium butyl xanthan in water by vacuum ultraviolet irradiation
- 基金项目：广西重点研发计划项目（No.桂科AB16380278）；"广西特聘专家"专项经费资助项目
- 毛珺
- 广西大学资源环境与材料学院, 南宁 530004
- 黄河
- 广西大学资源环境与材料学院, 南宁 530004
- 莫慧敏
- 广西大学资源环境与材料学院, 南宁 530004
- 陈俊先
- 广西大学资源环境与材料学院, 南宁 530004
- 黄丹
- 广西大学资源环境与材料学院, 南宁 530004
- 刘栩彤
- 广西大学资源环境与材料学院, 南宁 530004
- 张超兰
- 广西大学资源环境与材料学院, 南宁 530004
- 覃朝科
- 中国有色桂林矿产地质研究院有限公司, 桂林 541004
- 摘要：黄原酸盐是常用的有色金属硫化矿浮选剂，进入环境后会造成潜在风险.本文以丁基黄原酸钾（PBX）为目标污染物，在比较真空紫外辐照法（VUV）、曝气（Aeration）、过氧化氢（H2O2）氧化和次氯酸钠（NaClO）氧化处理对PBX降解效果的基础上，深入研究反应温度、初始pH值、初始底物浓度及共存离子对效果最优的VUV法降解PBX的影响，探明影响VUV降解PBX的关键因素并建立动力学模型.结果表明，对初始浓度为20 mg·L-1的PBX进行VUV、NaClO氧化、H2O2氧化和曝气处理60 min后，VUV处理效果最优（PBX降解率为97.49%），随后依次为H2O2氧化、NaClO氧化和曝气处理.在VUV处理过程中，反应温度和初始pH的升高促进了PBX降解，随着PBX初始浓度增加降解速率常数（kC）减小.溶液中共存的CO32-、SiO32-促进了PBX降解，Ca2+则抑制了PBX降解.反应温度和初始pH值是影响PBX降解的关键因素，基于这两个因素建立了PBX降解的模型方程.从经济有效的角度综合考虑，反应温度35℃、pH=8、合适的阴离子（SiO32-、CO32-）及其浓度有利于促进VUV降解PBX.研究结果为选矿废水有机污染物的处理提供了新思路.
- Abstract：Butyl xanthan (PBX) was widely used in the flotation of nonferrous sulfide ore, which posed a potential risk to the surrounding environment. In this study, a laboratory experiment was conducted to evaluate the effects of four methods (Vacuum-UV, Aeration, H2O2 oxidant processes and NaClO oxidant processes) on the degradation of PBX. After 60 min reaction in 20 mg·L-1 PBX solution, the highest degradation rate of PBX was found in VUV treatment (97.49%), followed by H2O2 oxidant processes, Aeration and NaClO oxidant processes. Based on this result, the experimental parameters of reaction temperature, initial pH value, initial substrate concentration and coexisting ions were considered in VUV treatment (the optimal one). And the related kinetic model was also established. The results indicated that the higher temperature and the higher pH were favorable for the degradation of PBX. And the degradation rate constant (kC) decreased with the increased initial concentration of PBX. The presence of CO32- and SiO32- promoted PBX degradation in solution, while Ca2+ inhibited. Moreover, the model equation of PBX degradation was established based on the reaction temperature and the initial pH which were the key factors affecting the degradation of PBX. In conclusion, VUV method can effectively degrade PBX in solution under 35℃ and pH 8 and at the presence of SiO32- and CO32- with appropriate concentration. We present a way to treat organics in mineral processing wastewater.
