| UV/Fenton法处理低浓度含镍络合废水研究 |
| Treatment of Wastewater with Low Levels of Complexed Nickel Using a UV/Fenton System |
| 投稿时间：2017-04-05 修订日期：2019-01-22 |
| DOI：10.15928/j.1674-3075.2019.02.012 |
| 中文关键词:UV/Fenton 镍络合物 酒石酸 柠檬酸 乙二胺四乙酸 |
| 英文关键词:UV/Fenton nickel complex tartaric acid citric acid ethylenediaminetetraacetic acid (EDTA) |
| 基金项目:上海重金属污染控制与资源化工程技术研究中心能力提升项目(15DZ2280400) |
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| 中文摘要: |
| 为了有效去除低浓度含镍络合废水中的镍离子（Ni2+），探究影响Ni2+去除效果的因素和方法，通过改变低浓度溶液中沉淀pH值、H2O2与Fe2+摩尔比、H2O2投加量、初始pH值和反应时间，基于UV/Fenton法研究了以上各因素对Ni2+去除效果的影响及机理；同时比较UV/Fenton法与Fenton法对Ni2+的去除效果，自配含有典型络合剂的镀镍模拟废水，酒石酸:柠檬酸:乙二胺四乙酸:镍（摩尔比）为1.5:2:1.5:1，Ni2+含量5 mg/L，pH4.0；光催化实验在光化学反应仪中进行，反应系统由循环水冷却，维持温度在（32±2）℃，光强度为12.7 mW/cm2。50 mL的石英管中依次加入模拟络合镍废水和一定量的Fenton试剂，100 W中压汞灯光照下进行连续磁力搅拌；光照一定时间后，NaOH调节pH至11.0，用离心机离心后取上清液测定镍含量，测定方法采用火焰原子吸收分光光度计。结果显示，UV/Fenton法去除Ni2+的最佳反应条件为初始pH值2.6左右，H2O2:Fe2+（摩尔比）为3:1，H2O2投加量为3 mmol/L，反应时间为1 h，沉淀pH值为11.0，Ni2+去除率可达98%以上。研究表明，增大沉淀pH值、合理控制H2O2浓度、增加反应时间，可提高低浓度镍络合物中Ni2+的去除效果；相较于单一Fenton法，采用UV/Fenton法可更好的去除低浓度镍络合物中的Ni2+。 |
| 英文摘要: |
| To improve removal of Ni2+ in wastewater from nickel-plating operations, we investigated the factors affecting removal efficiency and compared the performance of a UV/Fenton system with the Fenton method. Simulated nickel plating wastewater was prepared using molar ratios of tartaric acid to citric acid to ethylenediaminetetraacetic acid of 1.5:2:1.5:1, containing 5 mg/L of Ni2+ at pH 4.0. The effects of solution pH, n(H2O2):n(Fe2+), H2O2 dosage, initial pH and reaction time on the removal efficiency of Ni2+ were investigated. Photolysis experiments were conducted in a photochemical reactor at 32±2℃, a light intensity of 12.7 mW/cm2 and cooled with circulating water. Simulated nickel wastewater and a specified quantity of Fenton reagent were added to the 50 mL quartz tube with continuous magnetic stirring and illuminated by a 100 W medium-pressure mercury lamp. At a specified reaction time, precipitation was initiated by raising the pH to 11.0 with NaOH and the nickel content of the supernatant was determined by flame atomic absorption spectrophotometry. Optimal conditions for Ni2+ removal were as follows: initial pH 2.6, H2O2 = 3 mmol/L, n(H2O2) : n(Fe2+) = 3:1, reaction time = 1 h, precipitation pH = 11.0. Under optimal conditions, 98% removal of Ni2+ was achieved. The removal efficiency of Ni2+ was improved by increasing the precipitation pH, controlling the concentration of H2O2 and increasing reaction time. The UV/Fenton method displayed better removal efficiency of Ni2+ compared with the single Fenton method. |
| 封敏,袁志军,刘文乾,王兆慧,王英华.2019.UV/Fenton法处理低浓度含镍络合废水研究[J].水生态学杂志,40(2):82-87. |
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