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1.
Uptake and concentration of heavy metals in dominant mangrove species from Hainan Island,South China
Wang Junguang Wang Peng Zhao Zhizhong Huo Yanru 《Environmental geochemistry and health》2021,43(4):1703-1714
Environmental Geochemistry and Health - By investigating three dominant mangrove species, namely Aegiceras corniculatum, Kandelia candel, Ceriops tagal and their rhizosediment in Mangrove wetlands... 相似文献
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受全球金融危机的影响及我国新税政的实施,我国再生资源回收产业陷入前所未有的困境。针对当前我国再生资源回收产业所面临的突出问题和实际困难,提出扶持再生资源回收产业发展的若干建议。 相似文献
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Banana peels were employed for the removal of metribuzin from aqueous solution. Sorption in the batch mode was optimized regarding pH, contact time, sorbent dose, initial pesticide concentrations, and temperature. The sorption data were fitted to pseudo-first-order, pseudo-second-order, intraparticle diffusion, Elovich, and liquid film diffusion model, the pseudo-second-order exhibiting best fit (R2 = 0.9803). Of the four most common sorption isotherm models (Langmuir, Freundlich, Tempkin, and Dubinin–Radushkevich), the data followed the Langmuir isotherm with highest correlation. The maximum adsorption capacity was found to be 167 mg g?1. Gibbs free energy, enthalpy, and entropy showed that the sorption was exothermic and spontaneous. 相似文献
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The present study employed ozonation process to treat the bamboo industry wastewater (BIWW). The impact of ozone dosage and initial organic concentration on color, COD and TOC removal rates were studied along with characterization of the major organics in raw and treated wastewater. The results suggested the ozone dosage of 3.15 g h−1 (concentration 52.5 mg L−1) was suitable for the treatment. After 25 min ozonation of 1 L raw wastewater, the color, COD and TOC removal efficiencies were 95%, 56% and 40%, respectively, with an influent COD concentration of 835 mg L−1. The ratio of kg O3 kg−1 COD at 3.15 g h−1 was 2.8 (<3), revealing that ozonation was a cost effective process for tertiary treatment of BIWW. Longer oxidization time was required to achieve similar results for raw wastewater with higher COD concentration. The chromatogram from gel permeation chromatography revealed that ozonation resulted in the breakdown of high molecular weight compounds into lower molecular weight components but could not completely mineralize the organic matter. The majority of these compounds were identified in both raw and ozonated samples via GC-MS analysis. In addition to ester derivatives as the main intermediates of ozonation, 1-chloroctadecane, methyl stearate, benzophenone and α-cyperone were identified as the by-products of ozonation. 相似文献
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Nguyen Duyen Thi Cam Tran Thuan Van Kumar Ponnusamy Senthil Din Azam Taufik Mohd Jalil Aishah Abdul Vo Dai-Viet N. 《Environmental Chemistry Letters》2022,20(2):1421-1451
Environmental Chemistry Letters - Water contamination is an environmental burden for the next generations, calling for advanced methods such as adsorption to remove pollutants. For instance,... 相似文献
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应巴基斯坦政府的请求,第二批中国国际救援队队员,带着祖国人民的重托于2005年10月28日中午12时乘包机飞往巴基斯坦执行以医疗救助为主的救援任务。这时距我们第一批国际救援队队员归来仅仅8天的时间。 10月28日下午三点半,我们抵达伊斯兰堡机场,中国驻巴基斯坦张春祥大使、巴劳工部部长和有关人员在机场迎接我们,随后妥善安排了卸货、人员运送车辆等。我还是负责全体救援队员 相似文献
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