JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jiaolong Qin,Daniel J. Ashworth,Scott R. Yates,Guoqing Shen
Reducing the emissions of soil fumigants such as 1,3-dichloropropene (1,3-D) is essential to protecting air quality. Although biochar is useful in reducing such emissions, biochar-adsorbed fumigants may desorb and cause secondary air pollution. This study investigated the degradation of 1,3-D on iron (Fe)-impregnated biochar (FBC) amended with urea-hydrogen peroxide (UHP). The results indicated the degradation rate of trans -1,3-D on FBC-UHP was 54-fold higher than that on pristine biochar (PBC). Electron paramagnetic resonance (EPR) combined with other characterization methods revealed that the presence of semiquinone-type radicals in FBC effectively accelerated the Fe(III)/Fe(II) cycleto maintain enough Fe(IIII) for UHP activation and ·OH generation. ·OH, rather than ·O 2 - , was the dominant active oxidant. Soil column tests showed that application of FBC to the soil surface reduced cumulative 1,3-D emissions from 34.80 % (bare soil) to 0.81%. After the column experiment, the mixing of the FBC with UHP resulted in the residual cis -isomers decreasing from 32.5% to 10.5%. Greenhouse bioassays showed that mixing post-1,3-D degradation FBC-UHP with soil significantly promoted lettuce growth relative to PBC. The findings of this study provide a new approach for biochar application, especially for the emission reduction of hazardous volatile organic compounds from soil.
研究领域:
环境科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 6
·6980-6989
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IF 3.056
Yan Lili,Guo Xin,Rao Pinhua,Huang Lu,Sun Mingxing,Li Liang,Shen Guoqing
Soil fumigation using 1,3-dichloropropene (1,3-D) and chloropicrin (CP) is an important strategy for agriculture production; however, excessive emissions can cause air pollution and possible human exposure. In this study, solar light-driven CuInS 2 /ZnS:Al-TiO 2 photocatalytic film was prepared through spin-coating on the flexible polyethylene terephthalate (PET) substrate of 0.1 mm. Using the photocatalytic film, degradation of 1,3-D was inhibited in the Pci-clor 60 formulation of 1,3-D and CP. However, the degradation of CP was accelerated in this formulation, and the half-life was shortened from 0.66 to 0.40 h. Emissions of 1,3-D from soil to the air were reduced by 97.30%, 97.17%, 47.10%, and 7.88%, for treatments of D + Film, D + C + Film, D + PET, and D, respectively. The efficiencies for reducing 1,3-D emission were significantly improved by about 1.1 and 11.3 times using the film, compared with using the PET alone and no film, respectively. Furthermore, fumigation effects on nematodes could still achieve higher than 90%. The findings provided a basis for the practical application of quantum dot films to reduce soil fumigants emissions by photocatalytic degradation.
研究领域:
环境科学
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农业化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 81
·77777-77785
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IF 3.289
Lili Yan,Jiaolong Qin,Long Kong,Huibo Zhi,Mingxing Sun,Guoqing Shen,Liang Li
A novel and improved protocol was developed to prepare CuInS2/ZnS:Al-sensitized TiO2 (CIS/ZnS:Al–TiO2) nanocomposites for 1,3-dichloropropene (1,3-D) photodegradation. Response surface methodology was employed to model and optimize the operational parameters of this protocol. The CIS/ZnS:Al quantum dot (QDs) content, ZnS:Al coating time, and TGA/TiO2 molar ratio were chosen as independent variables at three levels by using the Box–Behnken design; their combined effects on the 1,3-D degradation efficiency were investigated. The synthesized CIS/ZnS:Al QDs and CIS/ZnS:Al–TiO2 nanocomposites were characterized by their photoluminescence intensity, UV-vis absorption spectra, X-ray diffraction, and transmission electron microscopy. Based on the experimental results, an empirical expression was established and subsequently applied to predict the 1,3-D degradation efficiency with the prepared photocatalysts. The predicted degradation efficiencies matched well with the experimental values (R2, 0.9874). The ANOVA results showed that the significance of the parameters was ZnS:Al coating time > QDs content > TGA/TiO2 molar ratio. The 3D response surface plots indicated that the optimum synthesis parameters were a CIS/ZnS:Al QDs content of 23%, a coating time of 418 min, and a molar ratio of 1.6. The 1,3-D degradation efficiency with the optimized photocatalyst reached 92% under an irradiation time of 5 h. The photodegradation kinetics of 1,3-D was well fitted with a pseudo-first-order kinetic equation. The experimental design and theoretical prediction methods in this work are of great significance in the design and development of high-performance CIS/ZnS:Al–TiO2 nanocomposites.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）