Synthesis of MoS2 nanoparticle deposited graphene/mesoporous MnOx nanocomposite for high performance super capacitor application

The present study deal with the fabrication of low cost nanocomposite based electrodes based on Nickel foam binder free substrate for supercapacitor applications. The composition of nanocomposite is molybdenum sulphide nanoparticle/graphene coated on mesoporous manganese oxide. The first step is to involve the preparation of mesoporous manganese oxide by non-ionic surfactant assisted method. In the second stage is to deposit the reduced graphene on mesoporous manganese oxide in the presence of ultrasonic irradiation followed by addition of known quantity of commercial MoS₂ nanopowder (particle size below 90 nm). The manganese oxide based nanocomposite is showing porous architecture with graphene sheet formation together with MoS₂ nanoparticle deposition. N₂ adsorption-desorption Isotherm curves for MoS₂ nanoparticle (NP) modified graphene oxide/meso-MnO₂ and pure meso-MnO₂ displayed type IV isotherm with improved surface area values. The reduced graphene oxide (graphene) and MoS₂ exist in the form of glassy flaky morphology as well as tubular/needle shapes are obtained after the deposition process in the final nanocomposite. The orderly arranged and anchored nano-sized mesoporous manganese oxide nanocomposites are showed increased specific capacitance (up to 527, 727 and 1160 F/g) and continuous cyclic stability.     

沸腾炉混烧硫化氢酸性气的设计与生产实践

介绍了天福公司300 kt/a合成氨项目硫化氢酸性气回收处理的设计及运行情况。将天福公司的硫化氢酸性气送入瓮福集团硫铁矿制酸的沸腾炉直接燃烧。不但可减少H2S气体对环境的污染问题,而且硫资源得以回收利用。项目投资少,社会效益、经济效益可观,且能满足天福公司长周期稳定生产的需要。     

Elimination of hydrogen sulphide from odorous air by a wood bark biofilter

Wood bark, used as biofilter material, gives less back pressure than fibre peat or household compost and is therefore cheaper in variable costs than the other materials. With a filter bed height of 0.9 m and with a surface load of 65 m³ m⁻² h⁻¹, 10 ppm hydrogen sulphide is efficiently eliminated from odorous air by a wood bark biofilter. The most important parameter for a good functioning of the filter is the water content of the filter material. The optimum for wood bark is about 65%. Unnecessarily high back pressures are recorded during sprinkling water on top of the filter. Therefore, it seems preferable to condition the relative humidity of air entering the filter. If absorption and adsorption were the only factors in the biofilter mechanism, hydrogen sulphide would, in the given circumstances, break through after about 7 h. It is shown that hydrogen sulphide is oxidized to sulphate. According to literature data, chemical oxidation is too slow and therefore hydrogen sulphide oxidation in the biofilter is attributed to microbiological action.     

黄单胞菌脱硫的最佳生长条件研究

从某糖厂污泥中分离、提纯到一株异氧型脱硫细菌，并就其生长特性进行研究，利用单因素试验方法确定其脱硫最佳生长条件，以期降低微生物脱硫技术工艺设施的运行费用，并为进一步开发生物脱硫工艺的脱硫能力提供一定的理论基础。     

Biological sulphate removal in an upflow packed bed reactor

Mine waters and industrial effluents with high sulphate concentrations create a disposal problem in terms of excess mineralization of surface waters. Removal of sulphate can be achieved by various processes including biological techniques, all of which involve appreciable costs. The purpose of this investigation was to improve on known biological methods for the removal of sulphate. Good sulphate removal was obtained by providing anaerobic conditions on a solid medium and maintaining a low hydrogen sulphide concentration by recirculating the water through a photosynthetic reactor for sulphur production.     

Restoration of heavily polluted branches of the Shatt Al-Arab river, Iraq

In view of the desire to improve the water quality of the heavily polluted branches of the Shatt al-Arab River at the City of Basrah, it was proposed to maintain effective flushing as well as contracting sewerage system. The present study was conducted in order to examine the water quality of these branches in an attempt to evaluate the effectiveness of the proposed flushing system. It has been found that their waters contained very low levels of dissolved oxygen and relatively high amounts of both COD and BOD₅. The annual average water quality parameters for Basrah Branches were: dissolved oxygen 3.4 ppm; pH 7.67; hydrogen sulphide 1.4 ppm; ammonia 97 μg-at. N l⁻¹; COD 15.9 mg l⁻¹; BOD₅ 12.7 mg l⁻¹; dissolved silicates 202 μg-at. Si l⁻¹; dissolved reactive phosphate 13.4 μg-at. P-PO₄³⁻ l⁻¹; nitrate 10.4 μg-at. N-NO₃⁻ l⁻¹; nitrite 2.1 μg-at. N-NO₂⁻ l⁻¹ and chlorophyll-α 14.3 mg m⁻³. Based on our calculations, it has been concluded that the proposed system is effective, thus within a flushing cycle all of the above mentioned parameters will become within the acceptable values of the Shatt al-Arab water quality. Moreover, this system has no appreciable effect upon the water quality characteristics of the Shatt al-Arab River due to the fact that it discharges a high volume of water annually. However, It has been recommended to dredge the deposited sludge to a minimum depth of 50 cm.     

锍锑试金-电感耦合等离子体质谱法测定矿石中铂族元素

在锍试金配料中加入0.2 g锑粉进行熔炼,由于锑的保护作用,试金扣经水浸泡粉化后用(1+1)盐酸分解时锇不损失。铂族硫化物滤渣加10 mg锑粉保护,用2 mL王水在240℃下密闭消解1.5 h可完全溶解,试液采用ICP-MS测定。方法对铂族元素(钌、铑、钯、锇、铱和铂)检出限在0.03~0.16 ng/g之间,相对标准偏差(RSD,n=6)为3.9%~8.9%,国家标准物质测定值和认定值基本吻合,方法还可实现氧化镍源的提纯和循环使用。     

南岭地区多金属矿床铅同位素组成差异分析

南岭地区是我国多金属矿床重要的基地,为了解该区多金属矿床成矿物质来源特点方面的差异,选择利用铅同位素示踪技术,对区内黄沙坪、宝山、凡口、大宝山、大厂5个不同多金属矿床成矿物质来源特征进行统计分析。结果表明,黄沙坪、宝山、大宝山3个多金属矿床中铅的来源相同且形成于燕山运动第一次成矿期高峰期(180~155 Ma),凡口、大厂2个多金属矿床铅的来源相同,形成于燕山运动第二成矿高峰期(115~90 Ma)。南岭地区多金属矿床形成的构造背景与华南地区中生代处于拉张构造背景一致,多金属矿床的形成是晚中生代以来华南地区岩石圈伸展作用的结果。     

浅析某锌锡硫化矿重选前的工艺改进

从某锌锡硫化矿的原选矿工艺分析入手,分析了其重选前选矿工艺存在的主要问题,提出了改进措施。经分析研究,改进后将获得较好的选别指标及经济效益。