A low-cost assay for hydrogen peroxide using sewage sludge-based carbon nanodots†

IF 3.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Environmental Science: Water Research & Technology Pub Date : 2024-05-14 DOI:10.1039/D4EW00197D

Xiaonan Liu, Long Wang, Yuling Ye, Zhicheng Pan, Aijie Wang and Wei Huang

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Abstract

In this work, sewage sludge-based carbon nanodots (ss-CNDs) were prepared by a one-pot hydrothermal strategy using sewage sludge as the only raw material. The ss-CNDs showed high peroxidase-like activity. In the presence of hydrogen peroxide (H₂O₂), ss-CNDs catalyze the decomposition of H₂O₂ to form hydroxyl radicals (·OH), which oxidize colorless 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) into green ABTS radicals (ABTS·⁺). From this, a simple and effective method is developed for sewage sludge resource utilization and low-cost H₂O₂ colorimetric detection. The colorimetric sensing system for H₂O₂ offers a satisfactory determination range from 0.05 mM to 10 mM and a detection limit of 9.5 μM for H₂O₂. In addition, this colorimetric assay allows H₂O₂ as low as 0.2 mM to be distinguished with the bare eye. And the developed colorimetric system has potential application in environmental water samples.

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利用基于污水污泥的碳纳米点进行低成本过氧化氢检测

本研究以污水污泥为唯一原料，采用一锅水热法制备了污水污泥基碳纳米点（ss-CNDs）。ss-CNDs具有很高的过氧化物酶样活性。在过氧化氢（H2O2）存在的情况下，ss-CNDs 可催化 H2O2 分解形成羟基自由基（-OH），从而将无色的 2,2'-偶氮双（3-乙基苯并噻唑啉-6-磺酸）二铵盐（ABTS）氧化成绿色的 ABTS 自由基（ABTS-+）。由此，一种简单有效的污水污泥资源化和低成本 H2O2 比色检测方法应运而生。该 H2O2 比色传感系统的测定范围从 0.05 mM 到 10 mM，H2O2 的检测限为 9.5 μM。此外，这种比色测定法还能通过肉眼分辨出低至 0.2 mM 的 H2O2。所开发的比色系统有望应用于环境水样。

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来源期刊

Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

8.60

自引率

4.00%

发文量

206

期刊介绍： Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.