Degradation of Orange Ⅱ by persulfate activated with nitrogen-doped porous sludge carbon

doi:10.19965/j.cnki.iwt.2023-0144

Abstract

Abstract:

A nitrogen doped porous sludge biochar（NKBC） was prepared using municipal sludge as carbon source，potassium bicarbonate as activator，and urea as nitrogen source. N₂ adsorption-desorption experiments，SEM，XRD and XPS were used to characterize and analyze its specific surface area and surface characteristics. The results showed that NKBC had a large specific surface area. Due to N loading in the pores of NKBC，its surface was wrinkled，with many defects and activation sites. NKBC was used to activate the degradation of Orange Ⅱ by persulfate（PDS），and the performance of the NKBC/PDS system in degrading Orange Ⅱ was investigated. The results showed that after adding PDS 20 minutes，the degradation rate of Orange Ⅱ by the NKBC/PDS system reached 99.7%. This system could function over a wide pH range （3-11） and under common anionic conditions. The results of free radical quenching experiments and EPR spectroscopy indicated that the main active species for the degradation of Orange Ⅱ in the NKBC/PDS system were ·OH，SO₄ ^·- and ¹O₂，with ¹O₂ being the main active specie. The NKBC/PDS system constructed in this research can be applied to the treatment of dye wastewater，achieving the goal of “treating waste with waste”.

Key words: nitrogen-doping, sludge biochar, persulfate, Orange Ⅱ

摘要：

以市政污泥为碳源、碳酸氢钾为活化剂、尿素为氮源，制备了氮掺杂多孔污泥生物炭（NKBC），并采用N₂吸附-脱附实验、SEM、XRD、XPS对其比表面积、表面特征进行了系列表征与分析，结果表明，NKBC具有较大的比表面积，由于N负载于NKBC孔道内，其表面褶皱、缺陷较多，活化位点较多。将NKBC用于活化过二硫酸盐（PDS）降解橙黄Ⅱ，考察NKBC/PDS体系降解橙黄Ⅱ的性能，结果表明，在加入PDS 20 min后，NKBC/PDS体系对橙黄Ⅱ的降解率高达99.7%；该体系可在较宽pH范围（3~11）及常见阴离子存在条件下发挥作用。自由基猝灭实验和EPR光谱结果表明，NKBC/PDS体系降解橙黄Ⅱ的主要活性物种有·OH、SO₄ ^·-和¹O₂，且以¹O₂为主。该研究所构建的NKBC/PDS体系可应用于染料废水的处理，实现“以废治废”的目标。

关键词: 氮掺杂, 污泥生物炭, 过二硫酸盐, 橙黄Ⅱ

CLC Number:

TQ424
X703.1

Wenqi LI, Caigui LUO, Yuting XIONG, Xianping LUO. Degradation of Orange Ⅱ by persulfate activated with nitrogen-doped porous sludge carbon[J]. Industrial Water Treatment, 2024, 44(3): 133-141.

李文奇, 罗才贵, 熊瑜婷, 罗仙平. 氮掺杂多孔污泥炭活化过二硫酸盐降解橙黄Ⅱ[J]. 工业水处理, 2024, 44(3): 133-141.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0144

https://www.iwt.cn/EN/Y2024/V44/I3/133

Figures/Tables 14

Fig.1 Adsorption-desorption curves of BC，KBC and NKBC

Fig.2 SEM images of BC，KBC and NKBC

Fig.3 XRD patterns of BC，KBC and NKBC

Fig.4 XPS spectra of KBC and NKBC

Fig.5 Performances of different systems for degradation of Orange Ⅱ（a） and corresponding pseudo-first order reaction kinetics curves（b）

Fig.6 Effect of NKBC dosage on the degradation of Orange Ⅱ in NKBC/PDS reaction system

Fig.7 Effect of PDS dosage on the degradation of Orange Ⅱ in NKBC/PDS reaction system（a） and corresponding pseudo-first order reaction kinetics curves（b）

Fig.8 Effect of initial pH of solution on the degradation of Orange Ⅱ in NKBC/PDS reaction system

Fig.9 Effect of common anions on degradation of Orange Ⅱ in NKBC/PDS reaction system

Fig.10 Effects of quenchers on NKBC/PDS reaction system

Fig.11 Detection of reactive oxygen species in Orange Ⅱ degraded by NKBC activated PDS

Fig.12 Changes of UV-vis in Orange Ⅱ during the reaction

Fig.13 Degradation effects of NKBC/PDS system on different dyes

Fig.14 Stability evaluation of NKBC

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