KEY ENGINEERING MATERIALS
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2022
·
IF 0
Shariena Shamsul Bahari,Yuen Mei Lian,Ros Azlinawati Ramli,Lee Siew Ling
Textile dyeing often employs reactive dyes. The dye wastewater contains hazardous materials and is toxic to humans and the environment. Photodegradation using a semiconductor photocatalyst is a promising alternative approach for water purification and wastewater treatment. However, the photocatalyst’s low adsorption ability is a problem in the photocatalysis process. To compensate for this shortcoming, photocatalyst content must be combined with an adsorbent. Raw corn cob and titanium dioxide (TiO2) were used in this photocatalysis. Due to a synergistic impact, raw corn cob’s ability to adsorb and titanium dioxide’s ability to photodegrade organic pollutants from water bodies is expected to boost the removal performance. The degradation of Reactive Blue 4 (RB4) as a targeted dye was carried out in this research using a suspended mixture of commercial anatase TiO2 and raw corn cob under UV light. The effect of initial pH solution, initial dye concentration and contact time, TiO2-corn cob dosages, and the influence of other pollutants were investigated as factors influencing photodegradation-adsorption of RB4. The high removal rate of RB4 was obtained at a low pH of 2 and RB4 concentration of 40 ppm. The increased dose of TiO2-corn cob improved the RB4 dye removal performance. In conclusion, combining photodegradation and adsorption systems as a hybrid treatment method resulted in a synergistic increase in the efficiency of RB4 removal.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Shen,Yunli Wang,Kaixia Fan
ABSTRACT Acid turquoise blue A (ATBA) is treated by the combined dielectric barrier discharge (DBD) plasma and AC supported CuO (CuO/AC). CuO/AC is prepared by incipient wetness impregnation method. X-ray diffraction, N 2 adsorption/desorption isotherm, and scanning electron microscope are used to characterize the CuO/AC. Interactive effects of initial pH, conductivity value, input power, and CuO/AC dosage on the decolorization rate of ATBA are investigated. The predicted decolorization rate of ATBA reaches to 97.12% under the optimal condition, only have 1.95% error compared with the experimental value (95.87%). The possible coupling mechanisms of combined DBD plasma and CuO/AC are proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 11
·1814
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IF 5.719
Caizhen Liang,Qingshan Shi,Jin Feng,Junwei Yao,Hui Huang,Xiaobao Xie
In this work, an innovative nano-carbon material (N-CM) adsorbent was reported for exploring its adsorption behaviors toward cationic methylene blue (MB) and anionic reactive blue 19 (RB19) pollutants. The proposed N-CM was synthesized by a one-step solvothermal treatment of citric acid and zinc gluconate small precursors. N-CM consists of nanosheets that have an advantageous specific surface area, large sp2/sp3hybridized domains, and abundant nitrogen/oxygen-containing surface functional groups. The synergistic effects of these features are conducive to the MB and RB19 adsorption. Different from anionic RB19 adsorption (79.54 mg/g) by the cooperative π-π stacking and hydrogen bonding, cationic MB adsorbed onto N-CM mainly by the electrostatic attraction at the natural pH solution (> pHpzc), with an adsorption capacity up to 118.98 mg/g. Interestingly, both MB and RB19 adsorption conformed to the pseudo-second order kinetic (R2≥ 0.995) and Langmuir isothermal (R2≥ 0.990) models, accompanied by similar maximum monolayer adsorption capacities of 120.77 and 116.01 mg/g, respectively. Their adsorption processes exhibited spontaneously endothermic characteristics. Moreover, N-CM showed superior selective capability toward MB in different mixed dye systems, with high removal efficiencies of 73–89%. These results demonstrate that the high-performance carbon adsorbent prepared from small precursors via low-temperature carbonization shows great potentials in wastewater treatment.Keywords:nano-carbon adsorbent;small precursors;adsorption;methylene blue;reactive blue 19;selective capability
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zhujian Huang,Pingxiao Wu,Beini Gong,Shanshan Yang,Hailing Li,Ziao Zhu,Lihua Cui
To further enhance the visible light responsive property and the chemical stability of Fe/clay mineral catalysts, glutamic acid-iron chelate intercalated montmorillonite (G–Fe–Mt) was developed. The physiochemical properties of G–Fe–Mt were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), etc. The results showed that glutamic acid-iron chelates were successfully intercalated into the gallery of montmorillonite and the intercalated glutamic acid-iron chelate molecules were well preserved. The product G–Fe–Mt displayed excellent catalytic performance in heterogeneous photo-Fenton reaction under sunlight irradiation at acidic and neutral pH values. The chelation and the visible light responsiveness of glutamic acid produce a synergistic effect leading to greatly enhanced sunlight-Fenton reaction catalyzed by the heterogeneous G–Fe–Mt under neutral pH. G–Fe–Mt is a promising catalyst for advanced oxidation processes .
研究领域:
环境化学
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材料科学
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催化化学
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环境污染治理
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光化学
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土壤与环境矿物学
✓ 已验证
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2024
·Vol. 47
·期 3
·355-366
·
IF 3.5
Duan Xiaoyan,Pi Qian,Tang Lei
Dyes in wastewater have adverse effects on the environment and human health. Dye-decolorizing peroxidase (DyP) is a promising biocatalyst to dyes degradation, but the decolorization rates varied greatly which influencing factors and mechanisms remain to be fully disclosed. To explore an effective decolorizing approach, we have studied a DyP from Rhodococcus jostii ( Rh DyPB) which was overexpressed in Escherichia coli to decolorize four kinds of dyes, Reactive blue 19, Eosin Y, Indigo carmine, and Malachite green. We found the decolorization rates of the dyes by purified Rh DyPB were all pH-dependent and the highest one was 94.4% of Malachite green at pH 6.0. ESI–MS analysis of intermediates in the decolorization process of Reactive blue 19 proved the degradation was due to peroxidase catalysis. Molecular docking predicated the interaction of Rh DyPB with dyes, and a radical transfer reaction. In addition, we performed decolorization of dyes with whole E. coli cell with and without expressing Rh DyPB. It was found that decolorization of dyes by E. coli cell was due to both cell absorption and degradation, and Rh DyPB expression improved the degradation rates towards Reactive blue 19, Indigo carmine and Malachite green. The effective decolorization of Malachite green and the successful application of whole DyP-overexpressed cells in dye decolorization is conducive to the bioremediation of dye-containing wastewaters by DyPs. Graphical abstract
研究领域:
环境生物技术
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酶催化
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生物修复
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蛋白质工程
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废水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）