Complexation of iron by salicylic acid and its effect on atrazine photodegradation in aqueous solution

The photodegradation of atrazine and the photochemical formation of Fe(II) and H₂O₂ in aqueous solutions containing salicylic acid and Fe(III) were studied under simulated sunlight irradiation. Atrazine photolysis followed first-order reaction kinetics, and the rate constant (k) corresponding to the solution of Fe(III)-salicylic acid complex (Fe(III)-SA) was only 0.0153 h^?1, roughly one eighth of the k observed in the Fe(III) alone solution (0.115 h^?1). Compared with Fe(III) solution, the presence of salicylic acid significantly enhanced the formation of Fe(II) but greatly decreased H₂O₂ generation, and their subsequent product, hydroxyl radical (˙OH), was much less, accounting for the low rate of atrazine photodegradation in Fe(III)-SA solution. The interaction of Fe(III) with salicylic acid was analyzed using Fourier-transform infrared (FTIR) spectroscopy and UV-visible absorption, indicating that Fe(III)-salicylic acid complex could be formed by ligand exchange between the hydrogen ions in salicylic acid and Fe(III) ions.     

Nitrogen-enriched micro-mesoporous carbon derived from polymers organic frameworks for high-performance capacitive deionization

Nitrogenization is an effective method for improving the capacitive deionization（CDI） performance of porous carbon materials. In particular, polymer organic frameworks with heteroatom doping, containing an ordered pore structure and excellent electrochemical stability, are ideal precursors for carbon materials for high-performance CDI. In this study, a nitrogen-enriched micro-mesoporous carbon（NMC） electrode was fabricated by carbonizing a Schiff base network-1 at 500, 600, and 700 °C. Scanning ...     

阿尔泰多拉纳萨依金矿床初探

新疆多拉纳萨依金矿床位于阿尔泰克兰海西褶皱带玛尔卡库里大断裂的西南侧,西与苏联矿区阿尔泰之列宁诺戈尔斯克—孜里亚诺夫斯克构造成矿亚带相接。地层为中泥盆统托克萨雷组浅变质岩,大致呈南北走向的长条状分布在三个斜长花岗岩侵入体之间,并有许多钠长斑岩岩脉穿插。主要构造线方向为北北东,向西倾斜。金矿体赋存在沿断裂带侵入于灰岩中的石英钠长岩(或钠长石化斜长花岗岩)中。蚀变围岩主要为千糜岩化、白云母化的石英钠长岩。石英脉中金的品位虽然较高,但工业储量主要赋存于蚀变围岩中。自然金主要以显微和次显微状独立矿物被包裹于黄铁矿等矿物中,成色很高(932—967),其中的少量元素为银、汞和铋。为与斜长花岗岩有关的岩浆期后高—中温热液充填—交代矿床。     

蕨类植物中的Υ辐射体

报道了对七种蕨类植物作γ能谱分析的结果。铁芒萁及乌毛蕨对~(232)Th放射性系列的辐射子体吸收率很高。铁芒萁的~(223)Ac含量约为附近树叶的20倍,树枝的80倍,草的40倍。计算了芒萁对各γ辐射体的富集比率。铁芒萁和乌毛蕨可作为土壤中钍系含量的指标植物。人们应避免使用干蕨作为燃料。     

基于社会成本下农用化学品最优使用量的探讨

分析了农用化学品使用的现状及其对环境的负面影响，重点探讨了考虑社会总成本时农用化学品最优使用量的确定，介绍了农用化学品使用环境成本的核算方法。     

超声波强化污水生物处理的可行性探讨

通过对超声波空化处理难降解有机废水机理和超声波辐射促进微生物活性作用机制的分析研究，提出将超声波应用于强化污水生物处理的可行性。同时设计了利用超声波空化反应单元作为污水生物处理的前处理工艺，提高污水的可生化性，和在生物处理反应器中直接进行超声波辐射提高生物处理能力的工艺。分析了超声波强化污水生物处理的影响因素，并对未来的研究方向进行了展望。     

北京城区雨水径流水质及其主要影响因素

掌握城区雨水径流水质及其主要的影响因素是有效地利用城区雨水资源和控制城市非点源污染的基础。根据北京 1998— 2 0 0 0年大量的降雨径流水质数据 ,本文分析了城区屋面和道路雨水径流的水质变化规律及其主要影响因素城市雨水径流的水质很差 ,初期径流的污染程度甚至超过城市污水。除了空气质量的影响外 ,最重要的影响因素是屋面材料、道路类型及路面污染状况、气温、降雨强度、降雨量和降雨间隔时间等     

活性炭纤维吸附-催化燃烧装置处理有机废气

介绍一种处理有机废气的吸附－催化燃烧新型装置，以活性炭纤维为吸附剂，结合多单元分流组合式中附床，采用PLC电脑来实现整个系统的连续运行。实验运行结果表明，对于处理大风量，低浓度的有机废气，该技术与其他技术相比具有净化效率高，节能降耗，自动化水平高等优点。     

高羊茅对微牛物强化修复石油污染土壤影响的研究

进行了石油污染土壤在外源微生物菌剂和高羊茅协调作用下的强化修复试验，对外源微生物菌剂在不同植被条件下的去除特征进行了分析。分别进行了没有植物、高羊茅草坪、高羊茅草种新育草坪3种不同情况下的降解试验。结果表明，微生物菌剂对石油污染土壤有着良好的降解效果，去除率为36％-43％，而没有微生物菌剂和植被作用下的对照组的去除率仅为5．74％～6．0％；高羊茅草坪能够提高微生物进一步降解的能力，在直接铺草坪的情况下，去除率可以达到51％～62％；在播种高羊茅草种，形成新嫩草坪的情况下，去除率为48％～54％。结果表明，在直接铺高羊茅草坪条件下，微生物菌剂的强化分解作用可以提高41．6％-44．2％，在新嫩草坪作用下能够提高27．9％-30．6％，可以认为高羊茅草坪对于提高微生物菌剂的强化分解有一定的促进作用。在试验过程中还对不同修复的土壤pH值变化特性进行了分析。     

Novel electricity-saving concept using a radio technique for indoor lighting

This study proposes a novel concept for designing a radio switch that can match workplace characteristics and personal needs by individually controlling the lighting group to save electricity. We use a microcontroller that can achieve the function of timing, turned-on and turn-off by setting the internal program to control the radio switch for convenient use, and electricity saving. As compared with the traditional mechanical switch, the radio switch reduced the electricity consumption by 38.64 kwh/week (86.25% of ideal condition or 1194.62% of practical condition), and the annual CO₂ emission can be reduced by 1032.2 kg/year. Additionally, the cost of the radio switch to replace the traditional mechanical switch can be paid back in 1.72 years.