酸析—微电解—Fenton试剂氧化联合工艺预处理苯达松废水

采用酸析—微电解—Fenton试剂氧化联合工艺预处理苯达松废水。考察了酸析pH、铸铁粉加入量、微电解时间、双氧水加入量、Fenton试剂氧化时间等因素对废水处理效果的影响。实验结果表明：最佳工艺条件为酸析pH 3.0,铸铁粉加入量1.0 g/L,微电解时间2 h,Fenton试剂氧化时间4 h,双氧水加入量25 mL/L;在最佳工艺条件下处理初始COD为22 500 mg/L、BOD₅/COD为0.08、色度为2 500倍的苯达松废水,总COD去除率为96.2%,出水COD为858 mg/L,出水色度为150倍,BOD₅/COD为0.38;采用微电解—Fenton试剂氧化联合工艺预处理酸析后的苯达松废水,处理效果远高于单独微电解和单独Fenton试剂氧化工艺。     

废弃混凝土再生利用的产业化研究

作为大规模城市化的产物,废弃混凝土引发了一系列的资源和环境问题.废弃混凝土的再生利用技术已经日趋成熟,而市场化推广却遇到成本、制度等方面的一系列难题.引入循环经济的理念,对废弃混凝土与再生混凝土进行成本比较、对产业化的困难和条件进行了剖析,并从技术、产业、经济等各方面提出了政策建议,也可为其它资源再生产业的发展提供一定的借鉴.     

三峡水库地震孕震机理及蓄水地震活动分析

本文从三峡库区区域地质构造、活动断裂及库区水文地质特点建立三峡库区区域地震模型;根据蓄水后岩石的库水与地质相互作用对该区水文地质及构造影响,对该区水库诱发地震进行理论分析,浅释了三峡库区水库地震孕震机理;以三峡遥测台网测震资料及宜昌台地壳形变手段在蓄水前后的监测的地壳动态变化特征为基础,对三峡水库诱发地震作了初步探讨及趋势分析.     

国际环境法对我国环境保护的启示

介绍了国际环境法的内涵、基本原则和发展过程,报告了我国环境保护法律体系立法趋于逐渐完善但滞后性明显的现状,从立法和执法的角度分析了我国现阶段环境保护法存在执行不利的问题,建议以推进国际环境法的实施和完善为契机,制定明细的配套法规,强化执法力度;加强各行政机关间的交流与合作,统筹应对复杂的环保形势;发达地区扶持不发达地区发展环保事业,推进我国环保事业的进步。     

Nb2O5 nanowires in-situ grown on carbon fiber: A high-efficiency material for the photocatalytic reduction of Cr(VI)

Niobium oxide nanowire-deposited carbon fiber (CF) samples were prepared using a hydrothermal method with amorphous Nb₂O₅·nH₂O as precursor. The physical properties of the samples were characterized by means of numerous techniques, including X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), UV–visible spectroscopy (UV–vis), N₂ adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy. The efficiency for the removal of Cr(VI) was determined. Parameters such as pH value and initial Cr(VI) concentration could influence the Cr(VI) removal efficiency or adsorption capacity of the Nb₂O₅/carbon fiber sample obtained after hydrothermal treatment at 160°C for 14 hr. The maximal Cr(VI) adsorption capacity of the Nb₂O₅ nanowire/CF sample was 115 mg/g. This Nb₂O₅/CF sample also showed excellent photocatalytic activity and stability for the reduction of Cr(VI) under UV-light irradiation: the Cr(VI) removal efficiency reached 99.9% after UV-light irradiation for 1 hr and there was no significant decrease in photocatalytic performance after the use of the sample for 10 repeated cycles. Such excellent Cr(VI) adsorption capacity and photocatalytic performance was related to its high surface area, abundant surface hydroxyl groups, and good UV-light absorption ability.     

地下污油罐腐蚀因素分析及防腐措施

地下污油罐是石油炼化行业中的常用储罐,分析了地下土壤或油罐内部介质等因素对其造成的腐蚀,结合实际案例提出了污油罐防腐措施     

Au − Pd/mesoporous Fe2O3: Highly active photocatalysts for the visible-light-driven degradation of acetone

Three-dimensionally ordered mesoporous Fe_2O_3(meso-Fe_2O_3) and its supported Au, Pd,and Au-Pd alloy(xA uP dy/meso-Fe_2O_3; x = 0.08–0.72 wt.%; Pd/Au molar ratio(y) = 1.48–1.85)photocatalysts have been prepared via the KIT-6-templating and polyvinyl alcohol-protected reduction routes, respectively. Physical properties of the samples were characterized, and their photocatalytic activities were evaluated for the photocatalytic oxidation of acetone in the presence of a small amount of H_2O_2 under visible-light illumination. It was found that the meso-Fe_2O_3 was rhombohedral in crystal structure. The as-obtained samples displayed a high surface area of 111.0–140.8 m~2/g and a bandgap energy of 1.98–2.12 eV. The Au, Pd and/or Au–Pd alloy nanoparticles(NPs) with a size of 3–4 nm were uniformly dispersed on the surface of the meso-Fe_2O_3 support. The 0.72 wt.% AuP d1.48/meso-Fe_2O_3 sample performed the best in the presence of 0.06 mol/L H_2O_2 aqueous solution, showing a 100% acetone conversion within4 hr of visible-light illumination. It was concluded that the good performance of 0.72 wt.%AuPd_(1.48)/meso-Fe_2O_3 for photocatalytic acetone oxidation was associated with its ordered mesoporous structure, high adsorbed oxygen species concentration, plasmonic resonance effect between AuPd_(1.48) NPs and meso-Fe_2O_3, and effective separation of the photogenerated charge carriers. In addition, the introduction of H_2O_2 and the involvement of the photo-Fenton process also played important roles in enhancing the photocatalytic activity of 0.72 wt.%AuPd_(1.48)/meso-Fe_2O_3.     

Mesoporous cobalt monoxide-supported platinum nanoparticles: Superior catalysts for the oxidative removal of benzene

Mesoporous Co_3 O_4(meso-Co_3 O_4)-supported Pt(0.53 wt.% Pt/meso-Co304) was synthesized via the KIT-6-templating and polyvinyl alcohol(PVA)-assisted reduction routes.Mesoporous CoO(meso-CoO) was fabricated through in situ reduction of meso-Co304 with glycerol,and the 0.18-0.69 wt.% Pt/meso-CoO samples were generated by the PVA-assisted reduction method.Meso-Co_3 O_4 and meso-CoO were of cubic crystal structure and the Pt nanoparticles(NPs) with a uniform size of ca.2 nm were well distributed on the mesoCo_3 O_4 or meso-CoO surface.The 0.56 wt% Pt/meso-CoO(0.56 Pt/meso-CoO) sample performed the best in benzene combustion(T_(50%)=156℃and T_(90%)=186℃at a space velocity of 80,000 mL/(g h)).Introducing water vapor or C02 with a certain concentration led to partial deactivation of 0.56 Pt/meso-CoO and such a deactivation was reversible.We think that the superior catalytic activity of 0.56 Pt/meso-CoO was intimately related to its good oxygen activation and benzene adsorption ability.     

Studies on relationships between air pollutants and allergenicity of Humulus Scandens pollen collected from different areas of Shanghai

Pollen pollution and allergy are becoming prominent issues in China.However,few studies on pollinosis have been reported.As an allergen in the atmosphere,allergenic Humulus scandens pollen was collected from four districts of Shanghai,including Wusong(WS),Jiading(KD),Xujiahui(XJH) and Songjiang(SJ).The mass concentrations of SO₂,NO₂,O₃,PM₁₀,and PM_2.5(particulate matter with air dynamic diameter less than 10 and 2.5 um,respectively) near the ...     

多花黑麦草对黄金废水净化与富集的研究

多花黑麦草对黄金废水净化与富集的研究戴全裕（中国科学院南京地理与湖泊研究所，南京２１０００８）蔡述伟张秀英（江苏省地质矿产测试应用研究所）关键词黄金废水；多花黑麦草；净化与富集．多花黑麦草（Ｌｏｌｉｕｍｍｕｌｔｉｆｌｏｒｕｍ）是我国从意大利引进的优...