Degradation of sulfamethoxazole with peroxyacetic acid activated by alkali-modified sludge biochar

doi:10.19965/j.cnki.iwt.2023-0987

Abstract

Abstract:

Sludge biochar was prepared from municipal sewage sludge by oxygen-limited pyrolysis at 800 ℃, and modified with sodium hydroxide to obtain alkali-modified sludge biochar (N-SDBC) as a catalyst to activate peroxyacetic acid (PAA) for the degradation of sulfamethoxazole (SMX). The catalyst was characterized by SEM, FTIR, BET, and acid-base potential methods. The effects of oxidant concentration, catalyst dosage, initial pH, common anions in water, and humic acid on the degradation performance of SMX were investigated. The results showed that the degradation rate of SMX reached 83.8% in 90 minutes under the conditions of N-SDBC mass concentration of 1.5 g/L, PAA concentration of 1.0 mmol/L, and initial pH of 3.0. The coexisting anions and humic acids in the water body inhibited the degradation of SMX to different degrees. The results of the bursting experiments and electrochemical tests showed that ·OH and ¹O₂ were the main reactive oxygen species in the system, and there was an electron transfer mechanism in the N-SDBC/PAA system for the degradation of SMX. After four reused tests, the removal rate of SMX was maintained above 70%, indicating that N-SDBC had good stability.

Key words: peroxyacetic acid, sludge biochar, alkali modification, sulfamethoxazole

摘要：

以城市污水厂污泥为原料，在800 ℃下限氧热解制备污泥生物炭，使用氢氧化钠改性得到碱改性污泥生物炭（N-SDBC），并作为催化剂活化过氧乙酸（PAA）降解磺胺甲唑（SMX）。通过SEM、FTIR、BET以及酸碱电位法对催化剂进行表征，并考察了氧化剂浓度、催化剂投加量、初始pH、水体中常见阴离子和腐殖酸对SMX降解性能的影响。结果表明，在PAA浓度为1.0 mmol/L，N-SDBC质量浓度为1.5 g/L，初始pH为3.0的条件下，90 min内SMX的降解率达到83.8%；水体中的共存阴离子和腐殖酸对SMX降解有不同程度的抑制作用。猝灭实验和电化学测试结果表明，·OH和¹O₂是体系中主要的活性氧物种，且N-SDBC/PAA体系在降解SMX时存在电子转移机制。经过4次再生循环实验，N-SDBC活化PAA降解SMX的去除率保持在70%以上，说明N-SDBC具有较好的稳定性。

关键词: 过氧乙酸, 污泥生物炭, 碱改性, 磺胺甲唑

CLC Number:

X703

Luyao GAO, Banghai LIU, Xin DAI, Jingguang CHEN, Chunji JIN. Degradation of sulfamethoxazole with peroxyacetic acid activated by alkali-modified sludge biochar[J]. Industrial Water Treatment, 2024, 44(11): 132-141.

高璐瑶, 刘邦海, 代鑫, 陈景光, 金春姬. 碱改性污泥生物炭活化过氧乙酸降解磺胺甲唑[J]. 工业水处理, 2024, 44(11): 132-141.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0987

https://www.iwt.cn/EN/Y2024/V44/I11/132

Figures/Tables 14

Fig.1 Removal rate of SMX（a） and simulation curve of reaction kinetics model（b） in different system

Fig.2 SEM of SDBC（a） and N-SDBC（b）

Fig.3 FTIR of SDBC（a） and N-SDBC（b）

Fig.4 XPS spectra of C 1s，O 1s and Fe 2p of different sludge biochars

Fig.5 N₂ adsorption curves of SDBC（a） and N-SDBC（b）

Table 1 BET analysis of SDBC and N-SDBC

	BET比表面积/（m²·g^-1）	孔体积/（cm³·g^-1）	孔径/nm
SDBC	35.03	0.150	17.07
N-SDBC	39.54	0.064	6.46

Fig.6 Zero charge point of N-SDBC

Fig.7 Effects of initial PAA concentration on SMX removal rates

Fig.8 Effects of catalyst dosage on SMX removal rates

Fig.9 Effects of initial pH on SMX removal rates

Fig.10 Effects of Cl^-（a），HCO₃ ^-（b），SO₄ ^2-（c），NO₃ ^-（d），and HA（e） on SMX removal rates

Fig.11 Effects of free radical quencher on SMX removal rates

Fig.12 Linear scanning voltammetry curves analysis of different systems

Fig.13 Cyclic repetition test of N-SDBC

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