Fenton-Like Oxidation of Acid Yellow 23 in the Presence of Iron Rich Soil

Treatment of yellow dye 23 by heterogeneous Fenton-like process was studied using iron rich soil as an iron source. The iron rich soil sample was characterized by XRD, SEM and BET analysis. XRD pattern indicates that the iron rich soil is made of goethite and hematite. The reaction was systematically investigated under various experimental conditions such as pH, iron rich soil dosage, oxidant and dye concentrations. The result revealed that using iron rich soil as catalyst led to high discoloration efficiency (97.71% for 140 min of treatment) at pH = 2.5, 2 g/L iron rich soil and 16 m·mol/L H2O2. The degradation kinetics of acid yellow 23 can be described by a pseudo-first-order reaction following the Langmuir-Hinshelwood mechanism. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers.

旋转填充床中O_3/Fenton工艺处理酸性黄23印染废水的研究

以超重力旋转填充床(RPB)为反应装置,结合Fenton试剂,研究了臭氧高级氧化技术处理酸性黄23印染废水的效果。考察了初始pH值、Fe^(2+)离子浓度、H_2O_2浓度、臭氧质量浓度、旋转填充床转速、NaCl质量浓度、KH_2PO_4质量浓度、Na_2SO_4质量浓度等因素对脱色率和COD去除率的影响。实验结果表明,当转速为1000 r/min、pH=4、Fe^(2+)浓度为0.6 mmol/L、H_2O_2浓度为1.5 mmol/L、O_3质量浓度为40 mg/L、液体流量为30 L/h时,酸性黄23的脱色率可达到90%以上,溶液COD去除率可达到33%;随着NaCl、KH_2PO_4质量浓度的增加,酸性黄23脱色率与溶液COD去除率不断减小;改变Na_2SO_4质量浓度,酸性黄23脱色率与溶液COD去除率变化不大。