期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
皮化生产中盐析酸水在制革浸酸中的应用工艺研究
1
作者 王学川 强西怀 +2 位作者 姚柳琴 林小娟 王汉琪 《陕西科技大学学报(自然科学版)》 1994年第3期516-519,544,共5页
本文利用皮革化工厂硫酸化生产中的盐析酸水进行制革浸酸,经过中试及工业化应用表明,盐析酸水用于漫酸可简化制革工艺,制得皮革成品质量稳定。盐析酸水的综合再用不仅具有一定的经济效益,更重要的是大大地减轻了因直接排放而造成的... 本文利用皮革化工厂硫酸化生产中的盐析酸水进行制革浸酸,经过中试及工业化应用表明,盐析酸水用于漫酸可简化制革工艺,制得皮革成品质量稳定。盐析酸水的综合再用不仅具有一定的经济效益,更重要的是大大地减轻了因直接排放而造成的对环境的严重污染,从而体现出明显的社会效益。 展开更多
关键词 盐析酸水 皮革浸
下载PDF
Enhanced photocatalytic hydrogen production activity of highly crystalline carbon nitride synthesized by hydrochloric acid treatment 被引量:3
2
作者 Yang Li Dainan Zhang +1 位作者 Xionghan Feng Quanjun Xiang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第1期21-30,共10页
Crystalline carbon nitride(CCN)prepared by a molten-salt method is attracting increased attention because of its promising properties and excellent photocatalytic activity.In this work,we further improve the crystalli... Crystalline carbon nitride(CCN)prepared by a molten-salt method is attracting increased attention because of its promising properties and excellent photocatalytic activity.In this work,we further improve the crystallinity of CCN through synthesis by the molten-salt method under the action of aqueous hydrochloric acid(HCl)solution.Our results showed that the crystallinity of the as-prepared samples increased with increasing HCl concentration and reached the maximum value at 0.1 mol L^-1.This can be attributed to the removal of some potassium ions(K+)from the terminal amino groups of CCN by the aqueous HCl solution,which results in a release of the polymerization sites.As a result,the crystallinity of the as-prepared samples further increased.Moreover,the obtained 0.1 highly crystalline carbon nitride(0.1HCCN;treated with 0.1 mol L^-1 aqueous HCl solution)exhibited an excellent photocatalytic hydrogen evolution of 683.54μmol h^-1 g^-1 and a quantum efficiency of 6.6%at 420 nm with triethanolamine as the sacrificial agent.This photocatalytic hydrogen evolution was 2 and 10 times higher than those of CCN and bulk carbon nitride,respectively.The enhanced photocatalytic activity was attributed to the improved crystallinity and intercalation of K+into the xHCCN interlayer.The improved crystallinity can decrease the number of surface defects and hydrogen bonds in the as-prepared sample,thereby increasing the mobility of the photoinduced carriers and reducing the recombination sites of the electron-hole pairs.The K+intercalated into the xHCCN interlayer also promoted the transfer of the photoinduced electrons because these ions can increase the electronic delocalization and extend theπ-conjugated systems.This study may provide new insights into the further development of the molten-salt method. 展开更多
关键词 Crystalline carbon nitride Molten-salt method Photocatalytic hydrogen evolution Potassium ions Aqueous hydrochloric acid solution
下载PDF
Phosphate removal from aqueous solution by Donnan dialysis with anion-exchange membrane 被引量:3
3
作者 陈世洋 施周 +2 位作者 宋勇 李学瑞 胡远来 《Journal of Central South University》 SCIE EI CAS 2014年第5期1968-1973,共6页
The removal of phosphate from aqueous solution by Donnan dialysis with anion-exchange membrane was investigated.The results show that phosphate could be removed from aqueous solution without supplying external high pr... The removal of phosphate from aqueous solution by Donnan dialysis with anion-exchange membrane was investigated.The results show that phosphate could be removed from aqueous solution without supplying external high pressure or electrical potential.Under the conditions of influent phosphate of 2.0 mg/L,counterion(Cl-)concentration of 0.1 mol/L,stirring speed of 500 r/min and phase temperature of 298 K,the removal of phosphate achieves 70.0%.Decreasing counterion concentration has little influence on the removal of phosphate,but phosphate amount in anion-exchange membrane increases significantly.With the increase of stirring speed and phase temperature,the removal efficiency of phosphate greatly is improved.Existing forms of phosphate in aqueous solution affected transport of phosphate and only strong acidic pH of feed solution(pH=3.0)decreases the removal of phosphate.Transport of phosphate is also accompanied by change of pH value of feed solution.In consequence,it might be a promise potential process for phosphate advanced wastewater treatment,especially in the area where high salted nature water can be utilized. 展开更多
关键词 anion-exchange membrane COUNTERION Donnan dialysis phosphate removal
下载PDF
Assessment of the Impact of Developmental Activities on the Estuarine Environments of Mandovi and Zuari Rivers of Goa along the West Coast of India
4
作者 U.K. Pradhan P.V. Shirodkar 《Journal of Shipping and Ocean Engineering》 2011年第3期191-206,共16页
Physico-chemical and biological data on water and sediments were collected from Mandovi and Zuari Rivers of Goa along the central west coast of India from 2007 to 2008 to understand the impact of developmental activit... Physico-chemical and biological data on water and sediments were collected from Mandovi and Zuari Rivers of Goa along the central west coast of India from 2007 to 2008 to understand the impact of developmental activities on the riverine environments. Factor analysis of the data segregated over high and low tides indicated a total of 6 factors each explaining 91% of variance during high tide and 84% of variance during low tide in Mandovi River. In Zuari River, a total of 6 factors explained 83% of variance during high tide and 4 factors explained 78% of variance during low tide. Factor analyses showed the dominance of nitrite and nitrate in Mandovi and of lead and mercury in Zuari. Higher inputs of anthropogenic ammonia and phenols associated with some phosphate were found in both these rivers. Water quality index (WQI) studies showed increasing overall index of pollution (OIP) values especially in the upstream of Zuari River, suggesting slightly polluted water. Increasing developmental activities along the banks of these rivers introduce domestic and anthropogenic nutrients and trace metals in their estuarine region, which flush out to the sea as per tidal currents, which otherwise can hamper the natural environments of these two rivers. 展开更多
关键词 Mandovi River Zuari River WQI factor analysis anthropogenic contaminants tide.
下载PDF
Assessment of the Presence of Chlorides in Mortar through the Silver Nitrate Colorimetric Spraying Method
5
作者 Victor Correia de Oliveira Pereira Eliana Cristina Barreto Monteiro 《Journal of Civil Engineering and Architecture》 2015年第6期677-683,共7页
This study aims to evaluate the presence of free chlorides by the silver nitrate colorimetric spraying method in mortars made with Portland cement CP II Z-32. In order to make an assessment beyond the qualitative anal... This study aims to evaluate the presence of free chlorides by the silver nitrate colorimetric spraying method in mortars made with Portland cement CP II Z-32. In order to make an assessment beyond the qualitative analysis, a calculation of the contaminated areas by free chlorides was performed by measuring the regions using a computer image analysis software (IMAGEJ). The experimental part of the research involved samples of 5 cm x 10 cm of mortar and 0.1 M solution of silver nitrate in distilled water. The mortar samples were made with cement CP II Z-32 with the following concentrations of chloride incorporated into the mixing water: 0%0, 0.4%, 0.6%, 0.8%, 1.0% and 2.0%, in relation to the mass of cement, totaling 108 samples. The average of percentage results from the contaminated area of the series of samples was respectively 0%, 14.9694%, 19.7444%, 46.0239%, 62.3311% and 96.0083% in relation to the total area, concluding that the method of silver nitrate spraying is applicable and that the white color indicates the presence of chloride ions and other possible aggressive salts to the structure or the concrete. 展开更多
关键词 Silver nitrate chloride ions CORROSION colorimetric method.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部