Adsorption of methylene blue onto activated carbon produced from tea (Camellia sinensis L.) seed shells: kinetics, equilibrium, and thermodynamics studies     

Jun-jie Gao  Ye-bo Qin  Tao Zhou  Dong-dong Cao  Ping Xu  Danielle Hochstetter  Yue-fei Wang 《Journal of Zhejiang University. Science. B》2013,14(7):650-658

Tea (Camellia sinensis L.) seed shells, the main byproduct of the manufacture of tea seed oil, were used as precursors for the preparation of tea activated carbon (TAC) in the present study. A high yield (44.1%) of TAC was obtained from tea seed shells via a one-step chemical method using ZnCl₂ as an agent. The Brunauer-Emmett-Teller (BET) surface area and the total pore volumes of the obtained TAC were found to be 1 530.67 mg²/g and 0.782 6 cm³/g, respectively. The equilibrium adsorption results were complied with Langmuir isotherm model and its maximum monolayer adsorption capacity was 324.7 mg/g for methylene blue. Adsorption kinetics studies indicated that the pseudo-second-order model yielded the best fit for the kinetic data. An intraparticle diffusion model suggested that the intraparticle diffusion was not the only rate-controlling step. Thermodynamics studies revealed the spontaneous and exothermic nature of the sorption process. These results indicate that tea seed shells could be utilized as a renewable resource to develop activated carbon which is a potential adsorbent for methylene blue.  相似文献   

股票投资的又一个技术分析法   总被引：1，自引：0，他引：1  

陈文略  李亚兰 《黄冈师范学院学报》2000,20(6):8-11

当投资者进行股票投资且所选股票为蓝筹股时,给出一个最优选取的数学模型。  相似文献   

钢琴曲《二泉映月》演奏的艺术处理     

陈东 《衡阳师范学院学报》2000,(4)

钢琴曲《二泉映月》是最纯粹的中国民间曲调与西洋乐器的结合 ,演奏时需要充分发挥钢琴这门乐器的表现力 ,以深沉的艺术感染力、丰富的音色来达到良好的效果  相似文献   

中国山水画漫议     

郑芳 《周口师范学院学报》2001,18(4):90-91

首先提出了为什么要学习山水画.其次,从各个不同的朝代分析了中国山水画的发展过程.希望在继承传统绘画的同时,要弃其糟粕,取其精华.  相似文献   

Copper(II) hydroxide on artefacts: Corrosion,conservation, colourants     

Britta Schmutzler  Gerhard Eggert  Charlotte F. Kuhn-Wawrzinek 《文物保护研究》2017,62(2):61-67

Copper(II) hydroxide (as the rarely occurring mineral spertiniite) is formed under alkaline, oxidising conditions. It has been observed as a naturally occurring corrosion product of brass in sea water. But most occurrences on copper alloys are due to conservation treatments using basic solutions (sodium hydroxide or ammonia) or to intentional patination. Classical brass centrepieces (c. 1800), ‘cleaned’ with ammonia solution, developed a blue spertiniite patina in gaps, where evaporation was hindered. Additional to the danger of stress corrosion cracking this is another reason now outlawing this treatment. Copper pigment layers will transform to copper hydroxide when exposed to bases. The treatment of basic copper salts with bases has been used intentionally in the production of Bremen blue and similar pigments which can be composed of copper hydroxide as well.  相似文献   

蛋白质凝胶电泳及染色方法的几点改进     

陈芳  陈久存 《安康学院学报》2007,19(4):78-80

SDS-聚丙烯酰胺凝胶电泳(SDS-PAGE)及染色技术,是常用测定蛋白质亚基分子量的方法之一,具有设备简单、操作方便和分辨率高等优点.但在操作中,尤其样品较多时,此方法仍然有一些不足之处.通过大量实践,做以下改进:建立根据不同相对分子量的蛋白质快速选择凝胶浓度的方法,并确立解决蛋白质凝胶电泳和染色过程中的常见问题及改进策略.  相似文献   

Re-Discovering a Roman Wall Painting at Harvard: New Research on a Fragment from the Villa at Boscotrecase     

Elizabeth M. Molacek  Katherine Eremin  Lucy J. Cooper  Georgina Rayner 《文物保护研究》2020,65(5):296-311

ABSTRACT

This article presents historical and scientific analysis, as well as the conservation treatment of a newly rediscovered Roman wall painting fragment, now in the collection of the Harvard Art Museums. Although the piece has not previously been published, it was among a group of fragments removed from a Roman villa near Boscotrecase in southern Italy, an area that has been key to the study of Roman wall painting and other decoration. Technical imaging confirms the use of painting techniques consistent with other high-quality paintings in the area. Materials analysis revealed a palette consistent with published findings of Roman wall paintings, including abundant use of Egyptian blue and green earth. Of interest was the use of Egyptian blue as an optical brightener in select white passages. Despite the high quality of the painting, no cinnabar was present, and all red passages were achieved using hematite. Multiple different white minerals were identified including calcite, aragonite, and gypsum. The widespread presence of gypsum is unusual and may point to alteration.  相似文献   

CNT-TiO_2复合光催化降解溴酚蓝溶液的研究     

罗春华  史博  梁亮 《茂名学院学报》2011,21(3):5-7

以钛酸正丁酯为先驱体,乙醇为溶剂,盐酸为催化剂,以溶胶凝胶法制备TiO2溶胶,并将其负载于经纯化处理的碳纳米管上,再经不同温度煅烧获得TiO2复合光催化剂。用红外光谱对TiO2煅烧及负载前后进行结构表征,考察了光照条件下溴酚蓝的降解率。采用溶胶-凝胶及负载方法获得CNT-TiO2光催化剂并且明显提高了TiO2光催化效果。加入光催化剂的溴酚蓝容易在20min时降解率达到89%,远高于未负载前的46%的降解率。经比较,400℃煅烧的CNT-TiO2光催化剂的光降解效果相对较好。  相似文献   

艺术演绎中的文化追求——南通蓝印花布与道家文化     

钟慧敏 《南通职业大学学报》2010,24(3):20-22

作为南通地区传统民间印染工艺之一的南通蓝印花布与中国传统的道家哲学观念有着千丝万缕的联系,道家文化中的＂天人合一＂、＂无为而无不为＂以及＂万物负阳而抱阴＂的思想,在南通蓝印花布中色彩的运用、纹样的设计乃至面料的选择上都有深刻的体现。  相似文献   

关于山东半岛蓝色经济区发展的研究   总被引：4，自引：0，他引：4  

郭先登 《青岛职业技术学院学报》2010,23(1):6-12

建设富有特色和可持续发展的山东半岛蓝色经济区是中华民族走上复兴之路的伟大创造与壮举。建立山东半岛蓝色经济结构,要高度重视建立区域科学与合理的布局结构、产业结构、人才结构,必须紧紧地同＂经济文化强省＂连在一起,通过发展文化产业,进而加快推进建设＂创意型山东＂的步伐,全面提高山东半岛蓝色经济区的创造力水平。蓝色经济全新的经济概念,决定了一种新的商品经济形态的建立,决定了山东半岛蓝色经济区需要建立新的经济发展模式,而新的经济发展模式又需要实施新的科学发展战略。  相似文献