β-FeOOH/盐酸羟胺/H_2O_2非均相Fenton降解酸性橙Ⅱ

Degradation of acid orange Ⅱ by β-FeOOH/hydroxylamine hydrochloride/H_2O_2 heterogeneous Fenton system

利用水热法合成棒状β-FeOOH,研究了在β-FeOOH/H_2O_2组成的非均相Fenton体系中加入低浓度的盐酸羟胺(HH)对酸性橙Ⅱ(AOⅡ)的去除效果,同时考察了pH值、H_2O_2浓度、HH浓度对其去除率的影响.结果表明:反应体系pH值、H_2O_2浓度、HH浓度对AOⅡ去除效果有较大影响,当反应体系pH值为3.0、c(H_2O_2)和c(HH)分别为2.5,0.5 mmol·L^(-1)时,β-FeOOH对AOⅡ的去除率较高,达到97.82%.该体系由均相和非均相Fenton反应体系共同组成,自由基捕获实验结果表明该体系的活性物为·OH.洗脱实验证明吸附阶段去除的AOII在催化阶段被降解.经4次循环使用之后β-FeOOH仍有较高的催化活性.

The nanorod shaped β-FeOOH products are prepared by hydrothermal method. Degrada tion of acidic orange Ⅱ（AO Ⅱ ） in heterogeneous Fenton system composed of β-FeOOH/H2O2 with a low molar concentration of hydroxylamine hydrochloride （HH） is studied. Futhermore, the effects of pH value, H2O2 molar concentrations and hydroxylamine hydrochloride （HH） molar con centrations on the removal efficiency are investigated. The results show that the removal efficiency of AOⅡ is 97.82% under the optimal conditions of 2.5 mmol·L^-1 H2O2 and 0.5 mmol· L^-1 hydroxylamine hydrochloride （HH） at the initial pH value of 3.0. The system consists of homoge neous and heterogeneous Fenton reaction system, of which the active species is .OH from the free radical capture experimental results. The elution experiments demonstrate that the AO Ⅱ removed during the adsorption stage is degraded during the catalytic stage. The prepared β-FeOOH samples still have high catalytic activity after four cycles.