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1دورية أكاديمية
المؤلفون: Yiping Guo, Xiao Mi, Guoting Li, Xi Chen
المصدر: Journal of Chemistry, Vol 2017 (2017)
الوصف: Mn-modified diatomite was prepared by wet impregnation and subsequent calcinations processes. It was used as catalyst for sonocatalytic degradation of antibiotics tetracycline. Characterizations by scanning electron microscopy and X-ray diffraction pattern showed that the morphology and crystal structure of the modified diatomite were similar to these of raw diatomite. Despite containing very limited amount of Mn oxides, the Mn-modified diatomite showed much higher sonocatalytic activity than the raw diatomite. The increases in both MnSO4 concentration of the wet impregnation solution and the catalyst dosage could enhance the degradation of antibiotics tetracycline significantly. Kapp values for ultrasonication, catalyst adsorption, and both processes combined (0.10 mol/L MnSO4-modified diatomite) were 1.22 × 10−4, 0.00193, and 0.00453 min−1, respectively, while the corresponding values of R2 were 0.956, 0.986, and 0.953, respectively. These results demonstrated the significant synergetic effect by combining ultrasonication and catalyst adsorption processes. The presence of isopropanol, KBr, and NaN3 quenched a series of reactive oxygen species sharply, indicating the dominant role of reactive oxygen species in the sonocatalytic process. In contrast, the addition of Fe(II) enhanced the degradation due to the generation of more OH∙ radicals in the concurrent Fenton reaction. All the results indicated that Mn-modified diatomite had the great potential for water treatment by sonocatalytic oxidation.
وصف الملف: electronic resource
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2دورية أكاديمية
المؤلفون: Yiping Guo, Weiyong Zhu, Guoting Li, Xiaomin Wang, Lingfeng Zhu
المصدر: Journal of Chemistry, Vol 2016 (2016)
الوصف: The convenient and feasible pretreatment method of alkali treatment is very common in the degradation process of wheat straw. However, its utilization in the pretreatment of wheat straw as alternative adsorbents for aqueous heavy metals remediation is rarely reported. The present study investigated the removal efficiency of Cu(II) ions using wheat straw with alkali pretreatment. The condition of alkali treatment on wheat straw was optimized with the adsorption capacity of Cu(II) as indicator using single-factor experiments. The influences of wheat straw dosages, pH values, contact time, and temperatures on adsorption performance for both untreated wheat straw (UWS) and alkali-treated wheat straw (AWS) were investigated. Results showed that the relatively large removal rate of Cu(II) could be obtained, and chemical behavior occurred during the adsorption process. Characteristic analysis found that the major function of alkali treatment to wheat straw was to introduce the hydroxy group, which resulted in the increase of -C-O- group. Although the adsorption capacity is not as high as the one of ligands supported adsorbents, the method is easy to operate and has a wide range of application; at the same time, it could realize both purposes of treating heavy metal pollution and solid wastes.
وصف الملف: electronic resource
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3
المؤلفون: Xi Chen, Yiping Guo, Guoting Li, Xiao Mi
المصدر: Journal of Chemistry, Vol 2017 (2017)
مصطلحات موضوعية: Chromatography, Article Subject, Scanning electron microscope, Tetracycline, Chemistry, Radical, Sonication, 02 engineering and technology, General Chemistry, 010501 environmental sciences, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, lcsh:Chemistry, Adsorption, lcsh:QD1-999, medicine, Degradation (geology), Water treatment, 0210 nano-technology, 0105 earth and related environmental sciences, Nuclear chemistry, medicine.drug
الوصف: Mn-modified diatomite was prepared by wet impregnation and subsequent calcinations processes. It was used as catalyst for sonocatalytic degradation of antibiotics tetracycline. Characterizations by scanning electron microscopy and X-ray diffraction pattern showed that the morphology and crystal structure of the modified diatomite were similar to these of raw diatomite. Despite containing very limited amount of Mn oxides, the Mn-modified diatomite showed much higher sonocatalytic activity than the raw diatomite. The increases in both MnSO4 concentration of the wet impregnation solution and the catalyst dosage could enhance the degradation of antibiotics tetracycline significantly. Kapp values for ultrasonication, catalyst adsorption, and both processes combined (0.10 mol/L MnSO4-modified diatomite) were 1.22 × 10−4, 0.00193, and 0.00453 min−1, respectively, while the corresponding values of R2 were 0.956, 0.986, and 0.953, respectively. These results demonstrated the significant synergetic effect by combining ultrasonication and catalyst adsorption processes. The presence of isopropanol, KBr, and NaN3 quenched a series of reactive oxygen species sharply, indicating the dominant role of reactive oxygen species in the sonocatalytic process. In contrast, the addition of Fe(II) enhanced the degradation due to the generation of more OH∙ radicals in the concurrent Fenton reaction. All the results indicated that Mn-modified diatomite had the great potential for water treatment by sonocatalytic oxidation.
وصف الملف: text/xhtml
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21aff395780b75e1c417a8d45a54c672Test
https://doaj.org/article/86b8ba8708dd4890b5a54bff0d0f41b7Test -
4
المؤلفون: Xiaomin Wang, Weiyong Zhu, Lingfeng Zhu, Yiping Guo, Guoting Li
المصدر: Journal of Chemistry, Vol 2016 (2016)
مصطلحات موضوعية: Aqueous solution, animal structures, Article Subject, Environmental remediation, Contact time, Chemistry, Hydroxy group, food and beverages, Heavy metals, 02 engineering and technology, General Chemistry, Straw, 010402 general chemistry, 021001 nanoscience & nanotechnology, Alkali metal, 01 natural sciences, 0104 chemical sciences, lcsh:Chemistry, chemistry.chemical_compound, Adsorption, lcsh:QD1-999, Agronomy, 0210 nano-technology, Nuclear chemistry
الوصف: The convenient and feasible pretreatment method of alkali treatment is very common in the degradation process of wheat straw. However, its utilization in the pretreatment of wheat straw as alternative adsorbents for aqueous heavy metals remediation is rarely reported. The present study investigated the removal efficiency of Cu(II) ions using wheat straw with alkali pretreatment. The condition of alkali treatment on wheat straw was optimized with the adsorption capacity of Cu(II) as indicator using single-factor experiments. The influences of wheat straw dosages, pH values, contact time, and temperatures on adsorption performance for both untreated wheat straw (UWS) and alkali-treated wheat straw (AWS) were investigated. Results showed that the relatively large removal rate of Cu(II) could be obtained, and chemical behavior occurred during the adsorption process. Characteristic analysis found that the major function of alkali treatment to wheat straw was to introduce the hydroxy group, which resulted in the increase of -C-O- group. Although the adsorption capacity is not as high as the one of ligands supported adsorbents, the method is easy to operate and has a wide range of application; at the same time, it could realize both purposes of treating heavy metal pollution and solid wastes.
وصف الملف: text/xhtml
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73437911eab22c127a4c98bf0dc19bddTest
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