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Calcium Peroxide

The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

P V Chuong – 1st expert on this subject based on the ideXlab platform

  • rice seedling establishment as affected by cultivar seed coating with Calcium Peroxide sowing depth and water level
    Field Crops Research, 1995
    Co-Authors: M Yamauchi, P V Chuong

    Abstract:

    Abstract Inconsistent seedling establishment is a constraint to the adoption of direct seeding of lowland rice (Oryza sativa L.) in the tropics. Rice cultivars with superior seedling establishment in flooded soil have been recently identified. The establishment of these tolerant cultivars was compared with a control cultivar with and without Calcium Peroxide-coated seed under various combinations of water level and sowing depth. Water level had little effect on seedling establishment when seed were sown on the soil surface, but establishment was reduced by raising the water level when seed were sown below the soil surface. Calcium Peroxide-coated seed established better than the tolerant cultivars at 13- and 25-mm sowing depths, but their seedlings were shorter and less vigorous than those of tolerant cultivars. Tolerant cultivars and coated seed had longer mesocotyls than controls. Sowing tolerant cultivars beneath a flooded soil surface at less than 13 mm assists achievement of consistent seedling establishment in lowland rice production.

M Yamauchi – 2nd expert on this subject based on the ideXlab platform

  • rice seedling establishment as affected by cultivar seed coating with Calcium Peroxide sowing depth and water level
    Field Crops Research, 1995
    Co-Authors: M Yamauchi, P V Chuong

    Abstract:

    Abstract Inconsistent seedling establishment is a constraint to the adoption of direct seeding of lowland rice (Oryza sativa L.) in the tropics. Rice cultivars with superior seedling establishment in flooded soil have been recently identified. The establishment of these tolerant cultivars was compared with a control cultivar with and without Calcium Peroxide-coated seed under various combinations of water level and sowing depth. Water level had little effect on seedling establishment when seed were sown on the soil surface, but establishment was reduced by raising the water level when seed were sown below the soil surface. Calcium Peroxide-coated seed established better than the tolerant cultivars at 13- and 25-mm sowing depths, but their seedlings were shorter and less vigorous than those of tolerant cultivars. Tolerant cultivars and coated seed had longer mesocotyls than controls. Sowing tolerant cultivars beneath a flooded soil surface at less than 13 mm assists achievement of consistent seedling establishment in lowland rice production.

Xiang Zhang – 3rd expert on this subject based on the ideXlab platform

  • application of ascorbic acid to enhance trichloroethene degradation by fe iii activated Calcium Peroxide
    Chemical Engineering Journal, 2017
    Co-Authors: Xiang Zhang, Shuguang Lu, Mark L Brusseau, Xiaogang Gu, Minhui Xu, Xiaori Fu

    Abstract:

    Abstract The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated Calcium Peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO ) that is responsible for TCE degradation. The generation of Cl − from the degraded TCE was complete in the enhanced CP/Fe(III)/AA system. The investigation of solution matrix effects showed that the TCE degradation rate decreases with the increase in solution pH, while Cl − , SO 4 2− and NO 3 − anions have minor impact. Conversely, HCO 3 − significantly inhibited TCE degradation due to pH elevation and HO scavenging. The results of experiments performed using actual groundwater indicated that an increase in reagent doses are required for effective TCE removal. In summary, the potential effectiveness of the CP/Fe(III)/AA oxidation system for remediation of TCE contaminated groundwater has been demonstrated. Additional research is needed to develop the system for practical implementation.

  • Application of Calcium Peroxide in water and soil treatment: A review
    Journal of Hazardous Materials, 2017
    Co-Authors: Shuguang Lu, Xiang Zhang, Yunfei Xue

    Abstract:

    Calcium Peroxide (CP) has been progressively applied in terms of environmental protection due to its certain physical and chemical properties. This review focuses on the latest progresses in the applications of CP in water and soil treatment, including wastewater treatment, surface water restoration and groundwater and soil remediation. The stability of CP makes it an effective solid phase to supply H2O2 and O2 for aerobic biodegradation and chemical degradation of contaminants in water and soil. CP has exerted great performance in the removal of dyes, chlorinated hydrocarbons, petroleum hydrocarbons, pesticides, heavy metals and various other contaminants. The research progress in the encapsulation technologies of CP with other materials and the preparation of CP nanoparticles were also presented in this review. Based on the summarized research progresses, the perspective of CP application in the future was proposed.

  • the destruction of benzene by Calcium Peroxide activated with fe ii in water
    Chemical Engineering Journal, 2016
    Co-Authors: Xiaogang Gu, Shuguang Lu, Mark L Brusseau, Zhouwei Miao, Minhui Xu, Xiaori Fu, Xiang Zhang

    Abstract:

    Abstract The ability of Fe(II)-activated Calcium Peroxide (CaO 2 ) to remove benzene is examined with a series of batch experiments. The results showed that benzene concentrations were reduced by 20–100% within 30 min. The magnitude of removal was dependent on the CaO 2 /Fe(II)/Benzene molar ratio, with much greater destruction observed for ratios of 4/4/1 or greater. An empirical equation was developed to quantify the destruction rate dependence on reagent composition. The presence of oxidative hydroxyl radicals (HO ) and reductive radicals (primarily O 2 − ) was identified by probe compound testing and electron paramagnetic resonance (EPR) tests. The results of the EPR tests indicated that the application of CaO 2 /Fe(II) enabled the radical intensity to remain steady for a relatively long time. The effect of initial solution pH was also investigated, and CaO 2 /Fe(II) enabled benzene removal over a wide pH range of 3.0–9.0. The results of radical scavenging tests showed that benzene removal occurred primarily by HO oxidation in the CaO 2 /Fe(II) system, although reductive radicals also contributed. The intermediates in benzene destruction were identified to be phenol and biphenyl. The results indicate that Fe(II)-activated CaO 2 is a feasible approach for treatment of benzene in contaminated groundwater remediation.