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81.
Yuan Zhengqiu Yang Huizhi Xu Pan Li Chengfeng Jian Jian Zeng Jianxian Zeng Lingwei Sui Yuguang Zhou Hu 《Environmental science and pollution research international》2021,28(6):6411-6421
Environmental Science and Pollution Research - In this work, various photocatalysts were synthesized with an impregnation-precipitation process to in situ decorate Ag-based nanoparticles (NPs,... 相似文献
82.
Bottom ash is the major by-product of municipal solid waste incineration(MSWI), and is often reused as an engineering material, such as road-base aggregate. However, some metals(especially aluminum) in bottom ash can react with water and generate gas that could cause expansion and failure of products containing the ash; these metals must be removed before the ash is utilized. The size distribution and the chemical speciation of metals in the bottom ash from two Chinese MSWI plants were examined in this study, and the recovery potential of metals from the ash was evaluated. The metal concentrations in these bottom ashes were lower than that generated in other developed countries. Specifically, the contents of Al,Fe, Cu and Zn were 18.9–29.2, 25.5–32.3, 0.7–1.0 and 1.6–2.5 g/kg, respectively. Moreover,44.9–57.0 wt.% of Al and 55.6–75.4 wt.% of Fe were distributed in bottom ash particles smaller than 5 mm. Similarly, 46.6–79.7 wt.% of Cu and 42.9–74.2 wt.% of Zn were concentrated in particles smaller than 3 mm. The Fe in the bottom ash mainly existed as hematite, and its chemical speciation was considered to limit the recovery efficiency of magnetic separation. 相似文献
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运用基于非期望产出、非径向、非角度的SBM-DEA模型,对2005年-2014年福建省工业35个行业CO2排放效率进行评价,然后通过行业效率值动态聚类深入揭示福建省工业行业CO2排放特质,最后提出福建省工业低碳发展的建议.研究表明:福建省工业存在较大的节能减排空间,高效率行业具有技术进步显著的优势,中效率行业效率值受贸易结构影响,低效率行业普遍存在产能过剩的问题.因此,福建省工业低碳转型需要调整能源消费结构、推进低碳技术进步、优化贸易结构、消化过剩产能. 相似文献
85.
过硫酸钠原位修复三氯乙烯污染土壤的模拟研究 总被引:1,自引:0,他引:1
以过硫酸钠(Na2S2O8)为氧化剂,柠檬酸(CA)螯合Fe(Ⅱ)溶液作为活化剂,建立箱体模型模拟场地三氯乙烯(TCE)污染土壤的原位化学氧化修复.结果表明,经CA螯合Fe(Ⅱ)活化的Na2S2O8能较好的修复TCE污染土壤,持续氧化27 d后TCE浓度降到10 mg·kg-1以下;采用抽出氧化、循环再用的方式,地下水TCE浓度到45 d时降到21.4 μg·L-1.同时,氧化过程中过硫酸钠会产生SO42-,使土壤和地下水的pH降低;土壤有机质含量下降约10.1%. 相似文献
86.
The sorption of 17α-ethinyl estradiol(EE2),bisphenol A(BPA),and 4-n-nonylphenol(NP) in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils.Results showed that all sorption isotherms were nonlinear and fit the Freundlich model.The degree of nonlinearity was in the order BPA(0.537-0.686) > EE2(0.705-0.858) > NP(0.875-0.0.951) in single systems.The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam,Silt Loam and Silt increased from 0.758,0.705 and 0.858,to 0.889,0.910 and 0.969,respectively,when BPA concentration increased from 0 to 1000 μg/L,but the effect of NP was comparably minimal.Additionally,EE2 significantly suppressed the sorption of BPA,but insignificantly suppressed that of NP.These findings can be attributed to the difference of sorption affinity of EE2,NP and BPA on the hard carbon(e.g.,black carbon) of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals(EDCs).Competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes. 相似文献
87.
Xiangyun Zhong Shiyong Wu Yang Liu Zhenning Zhao Yaru Zhang Jinfeng Bai Jun Xu Bai Xi 《环境科学学报(英文版)》2013
The evolvement of morphology and structure of the coal with different metamorphic degrees during coking process in the vertical furnace was investigated by infrared Image detector. Moreover, the temperature distribution in the radial direction and the crack formation were also studied in heating process. The results show that the amount of crack and the shrinkage level of char decrease with the coal rank rising. In addition, the initial temperature of crack formation for char increases with the coal rank rising. 相似文献
88.
采用差速离心法和逐步提取法,分析Cd超积累植物小飞扬草根、茎、叶中Cd的亚细胞分布和化学形态。培养液中Cd浓度5mg/L和10mg/L条件下,在小飞扬草根、茎、叶中,细胞壁和细胞膜是Cd主要的结合场所,含量分别占总量的47.1%~49.0%、39.7%~41.4%、42.9%~56.2%,其次是胞液组分,含量分别占37.5%~41.4%、28.2%~40.7%、35.2%~46.8%,细胞器组分中Cd含量较少。Cd在小飞扬草根、茎、叶中均以氯化钠提取态为主,含量分别占70.5%~84.8%、72.4%~83.0%、50.0%~74.8%。根部各提取态含量依次为CNaCl>CHAC>CEtOH>CHCl>CW>CR,茎、叶中各提取态含量依次为CNaCl>CHCl>CHAC>CEtOH>CW>CR。在小飞扬草中,Cd与细胞壁和细胞膜中的果胶酸和蛋白质等物质结合固定,而进入细胞的Cd大部分与有机酸络合而隔离于液泡内,这可能是小飞扬草忍耐并超积累Cd的机制。 相似文献
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