基于BC-BiOI/PMS的光催化体系降解恩诺沙星的研究

doi:10.19965/j.cnki.iwt.2023-0472

摘要/Abstract

摘要：

通过水热法制备生物炭负载碘氧化铋光催化剂（BC-BiOI），并向体系中引入过一硫酸盐（PMS），将光催化和PMS高级氧化技术进行耦合。探讨了光/BC-BiOI/PMS复合体系对恩诺沙星（ENR）的降解效果，考察了反应条件对ENR去除的影响，并深入研究了光/BC-BiOI/PMS复合体系降解ENR的机理。研究表明，光/BC-BiOI/PMS体系对ENR的降解效果良好，在BC-BiOI投加量0.2 g/L、PMS投加量1.0 g/L、pH取7的条件下，ENR降解率可达76%。通过响应面法建模分析pH、BC-BiOI投加量、PMS投加量三因素之间的交互作用，结果表明，各因素对ENR降解的影响顺序为初始pH>PMS投加量>BC-BiOI投加量。根据自由基猝灭实验和电子顺磁共振（EPR）结果可知，体系中的主要活性氧物种为·OH、SO₄ ^·-和¹O₂，三者共同氧化降解ENR。重用性实验中，BC-BiOI光催化复合材料循环使用4次仍能保持65%以上的ENR去除率。

关键词: 光催化, 生物炭, 碘氧化铋, 过一硫酸盐, 恩诺沙星

Abstract:

In this paper, biochar-supported bismuth iodide-oxidized composite catalyst(BC-BiOI) was prepared by hydrothermal method, and persulfate(PMS) was introduced into the system to couple photocatalysis and PMS advanced oxidation technology. The degradation effect of Enrofloxacin(ENR) by the light /BC-BiOI/PMS composite system was investigated, and the effect of reaction conditions on the removal of ENR was examined. The mechanism of ENR degradation in light/BC-BIOI/PMS system was studied. The best degradation effect of typical antibiotic ENR was determined by light /BC-BiOI/PMS system. Under the conditions of BC-BiOI dosage of 0.2 g/L, PMS dosage of 1.0 g/L, pH of 7, the degradation rate of ENR could reach 76%. The interaction among pH, BC-BiOI dosage and PMS dosage was analyzed by response surface methodology. The results indicated that the order of the effect of various factors on ENR degradation was initial pH>PMS dosage>BC-BiOI dosage. According to free radical quenching experiments and electron paramagnetic resonance (EPR), the main active oxidation species in the system were ·OH, SO₄ ^·-, and ¹O₂, which jointly oxidized and degraded ENR. In the reusability test, BC-BiOI photocatalysis composite material could still remain more than 65% removal rate of ENR after four cycles.

Key words: photocatalysis, biochar, bismuth iodide, persulfate, Enrofloxacin

中图分类号:

X703.1

谭斌, 郝慧茹, 向宇桐, 刘宇宁, 张倩. 基于BC-BiOI/PMS的光催化体系降解恩诺沙星的研究[J]. 工业水处理, 2024, 44(6): 143-150.

Bin TAN, Huiru HAO, Yutong XIANG, Yuning LIU, Qian ZHANG. Degradation of Enrofloxacin by photocatalytic system based on BC-BiOI/PMS[J]. Industrial Water Treatment, 2024, 44(6): 143-150.

https://www.iwt.cn/CN/Y2024/V44/I6/143

图/表 9

图1 不同体系中ENR的去除情况

Fig.1 Removal of ENR in different systems

图2 BC-BiOI投加量对光/BC-BiOI/PMS体系降解ENR的影响

Fig.2 Effect of BC-BiOI dosage on ENR degradation in light/BC-BiOI/PMS system

图3 PMS投加量对光/BC-BiOI/PMS体系降解ENR的影响

Fig.3 Effect of PMS dosage on ENR degradation in light/ BC-BiOI/PMS system

图4 pH对光/BC-BiOI/PMS体系降解ENR的影响

Fig.4 Effect of pH on ENR degradation in light/BC-BiOI/PMS system

表1 响应面回归模型方差分析

Table 1 Analysis of variance of response surface regression model

方差来源	平方和	自由度	均方	F值	P值
模型	1 697.312 3	9	188.595 6	22.226 9	<0.000 1
A	1 378.701 2	1	1 378.701 2	162.419 2	<0.000 1
B	44.083 89	1	44.083 6	5.196 4	0.045 9
C	219.785 6	1	219.786 7	25.892 3	0.000 5
AB	0.362 3	1	0.363 1	0.043 67	0.840 7
AC	3.000 0	1	3.000 0	0.352 6	0.565 3
BC	3.000 0	1	3.000 0	0.356 1	0.565 3
A ²	0.222 3	1	0.227 8	0.026 62	0.875 6
B ²	8.344 5	1	8.346 5	0.987 6	0.345 1
C ²	41.533 2	1	41.532 3	4.896 2	0.051 4
残差	84.899 5	7	8.493 7
失拟项	73.212 1	3	14.643 1	1.621 3	0.636 2
纯误差	11.673 8	4	2.336 2
总和	1 782.192 3	16

图5 不同因素交互作用对ENR去除率的响应面图

Fig.5 Response surface of the interaction of different factors on ENR removal rate

图6 自由基猝灭剂对ENR降解率的影响

Fig.6 Effect of free radical quenching agents on the degradation rate of ENR

图7 EPR图谱

Fig.7 EPR spectra

图8 BC-BiOI催化剂用于重复降解ENR的效果

Fig.8 Repeated degradation of ENR by reusing BC-BiOI

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