Water
·
2023
·Vol. 15
·期 10
·1931
·
IF 3.4
Runjuan Zhou,Kuo Zhang,Ming Zhang
A back-propagation neural network (BPNN) was used to model and optimize the process of hydroxylamine (HA)-enhanced Fe2+activating peroxymonosulfate (PMS). Using HA-enhanced Fe2+to activate PMS is a cost-effective method to degrade orange II (AO7). We investigated the individual and interactive effects of the concentrations of Fe2+, HA, and PMS on the degradation of AO7. TheR2of the BPNN model was 0.99852, and the data were distributed aroundy=x. Sensitivity analysis showed that the relative importance of each factor was as follows: HA > Fe2+> PMS. The optimized results obtained by the genetic algorithm were as follows: the concentration of Fe2+was 35.33 μmol·L−1, HA was 0.46 mmol·L−1, and PMS was 0.93 mmol·L−1. Experiments verified that the AO7 degradation effect within 5 min was 95.7%, whereas the predicted value by the BPNN was 96.2%. The difference between predicted and experimental values is 0.5%. This study provides a new tool (machine learning) to accurately predict the concentrations of HA, Fe2+, and PMS to degrade AO7 under various conditions.Keywords:advanced oxidation process;machine learning;BPNN;sensitivity analysis;genetic algorithm
研究领域:
环境科学
·
化学工程
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 11
·1-10
·
IF 1.702
Laipan Minwang,Fu Haoyang,Zhu Runliang,Rivera Linda,Zhu Gangqiang,Zhu Jianxi,He Hongping
Hexavalent chromium (Cr(VI)) and dyes are of particular environmental concern and need to be removed from water urgently due to their high toxicity. Herein, we explored the possibility of electron transferring from dye Orange II (OII) to Cr(VI) under UV and simulated solar light irradiation, expecting to simultaneously decolorize dyes and reduce Cr(VI). Experimental results show that light irradiation can partially decolorize OII but has no ability to reduce Cr(VI) in solution only with OII or Cr(VI). However, both dyes and Cr(VI) can effectively and simultaneously be decolorized and reduced in the solution containing both OII and Cr(VI) under light irradiation, and a low pH level and high OII/Cr(VI) concentration ratio significantly favor the co-removal. Additionally, insoluble organo–Cr(III) complexes identified by FTIR and XPS characterization were generated during the reaction. These complexes are beneficial to the removal of chromium and total organic carbon from water. The possible degradation pathway of OII is further proposed based on the detection of degraded products by GC-MS analysis. The results of this work offer an approach for simultaneously removing multiple contaminants.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 81
·期 4
·709-719
·
IF 1.638
Liu Zhiqing,Chen Jianxin,Zhu Jianxi,Liu Lizhang,Jiang Zili
Poly-silicate-ferric (PSF) was developed as an heterogeneous UV-Fenton catalyst, which was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), UV-vis diffuse reflectance spectroscopy (DRS), Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM). The catalytic process of PSF and generation mechanism of hydroxyl radical based on photo-Fenton system were studied in detail. In the heterogeneous UV-Fenton system, the k app value of Orange II degradation was as high as 0.268 min −1 , which was 1.5 times compared to that with α -FeOOH as catalyst. As a result, the Orange II decolouration and mineralization rates were as high as 99.9% and 92.5% after 40 min treatment, respectively. Moreover, the hydroxyl radical concentration would increase to a peak value of 13.4 μmol/L at about 15 min. The fundamental cause of the high hydroxyl radical generation lay in the high release ability of iron ions from PSF. The peak concentrations of total iron ions and ferrous ions could increase to 4.53 mg/L and 1.57 mg/L at 20 min and 10 min, respectively. After treatment, the re-adsorption of iron ions on the surface of PSF could avoid the additional pollution caused by iron ions. The results confirmed that PSF was a high activity catalyst for an heterogeneous UV-Fenton system.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Environmental Chemistry Letters
·
2019
·Vol. 17
·期 3
·1435-1439
·
IF 4.617
Chen Yiqun,Tong Yang,Liu Zizheng,Huang Li-Zhi,Yuan Jianping,Xue Yingwen,Fang Zheng
UV-activated persulfate (PS) systems have been widely employed to remove organic contaminants. However, the heavy use of persulfate may lead to secondary pollution. Here we proposed a novel UV/PS/sulfite oxidation process, in which sulfite would not only promote but also partially replace persulfate to produce sulfate radicals. We tested this system using Orange II as a model compound. Results show that the use of sulfite improves the degradation of Orange II. For instance, increasing the molar ratio of sulfite to persulfate in the range of 0.05–0.5 enhanced the removal efficiency by 21.7%. Compared to the UV/PS system, the presence of sulfite can achieve a 33.4% higher performance. We also found that the absence of dissolved oxygen remarkably inhibited the oxidation of Orange II. SO
·− 4
, SO
·− 5
and HO · were identified in the UV/PS/sulfite system, and SO
·− 4
and HO · should be primarily responsible for Orange II removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Changquan He,Lei Shi,Sichao Lou,Bao Liu,Wenqing Zhang,Lingfan Zhang
In this present study, spherical magnetic calcium modified chitosan micro-particles (MG-Ca-CMPs) were synthesized by using embedding/cross-linking method and employed as an efficient adsorbent for Orange II (OII) in single system and coexisted with methylene blue (MB) in binary system. The obtained MG-Ca-CMPs were characterized by fourier transform infrared spectrometer, transmission electron microscopy , scanning electron microscope, X-ray diffraction and magnetic property measurement system analyses, which demonstrated that the MG-Ca-CMPs possessed core-shell structure and excellent superparamagnetic property. The adsorption behaviors for OII in single system and coexisted with MB in binary system were systematically studied. Adsorption experiments data showed that MG-Ca-CMPs presented an excellent high affinity to acid dye OII (q max = 962 mg·g −1 ) in single system, which followed the Langmuir isotherm model and pseudo-second order kinetics model. Interestingly, MB, hardly adsorbed in acidic solution, had effective adsorption performance (increased from 20 mg·g −1 to 350 mg·g −1 ) in binary system by MG-Ca-CMPs. This result was attributed to the synergistic effect caused by the positive and negative charge attraction between OII and MB, forming the positive-negative-positive adsorption mechanism. It is believed that MG-Ca-CMPs could be used as a potential adsorbent for the adsorption and separation of coexisting anionic-cationic dyes from dye wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhenping Liu,Haiyun Zhai,Zuanguang Chen,Qing Zhou,Zhixian Liang,Zihao Su
A novel Fe 2 O 3 nano-materials/oxygen functionalized multi-walled carbon nanotubes/triton X-100 modified carbon paste electrode (Fe 2 O 3 /MWCNTs-COOH/OP/CPE) was prepared to simultaneously detect orange G (Or G) and orange II (Or II) by electrochemical methods. Compared with the bare carbon paste electrode (CPE), Fe 2 O 3 /MWCNTs-COOH/OP/CPE exhibited obvious electrocatalytic activities towards Or G and Or II. Furthermore, the two azo dyes were identified and separated successfully, and were simultaneously determined by the redox peaks in cyclic voltammograms (CVs) and differential pulse voltammogram (DPV) under optimum conditions. In DPV, anodic peak current (Ipa) and concentrations were linearly related well for 0.1-20.0 μM Or G and 0.2-50.0 μM Or II. The limits of detection (S/N = 3) of Or G and Or II were 0.05 μM and 0.1 μM, respectively. Therefore, the electrode is suitable for the determination of Or G and Or II in industrial wastewater due to high sensitivity and selectivity, low detection limit, good reproducibility, as well as easy preparation and regeneration.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Leilei Wu,Hongbin Pu,Lunjie Huang,Da-Wen Sun
Synthetic dyes have been widely applied to food processing, but abuse of colourants in food may pose risks to human health. To analyze new coccine (NC) and orange II (OII) in food, a versatile surface-enhanced Raman scattering (SERS) platform was proposed. A metal-organic framework (MOF, UiO-66(NH 2 )) with octahedral crystal structure was synthesized and gold nanoparticles were grown on the MOF surface to fabricate UiO-66(NH 2 )@Au versatile SERS platform. The UiO-66(NH 2 )@Au displayed much better SERS performance than gold nanoparticles with high R 2 of 0.9684 for NC and 0.9912 for OII and low LOD of 0.4015 mg/L for NC and 0.0546 mg/L for OII. The recoveries of NC and OII in Mirinda soft drink and paprika ranged from 82.92 to 109.63%. This study provided a sensitive and rapid method for determination of NC and OII through UiO-66(NH 2 )@Au, and the proposed SERS platform revealed great potential for analyzing synthetic colourants in food samples.
研究领域:
分析化学
·
食品科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）