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亚硫酸盐离子对经铜活化的黄铁矿(用黄原酸预处理)影响的表面化学研究
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作者 陈隆玉 《铀矿冶》 CAS 2004年第2期110-111,共2页
关键词 硫酸盐离子 活化 黄铁矿 表面化学 分光法
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钙和硫代硫酸盐离子对镍—铜矿石浮选及选择性的影响
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《铀矿冶》 CAS 2002年第3期167-167,共1页
关键词 硫代硫酸盐离子 镍-铜矿石 浮选 选择性
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金属阳离子硫酸盐对沥青基碳材料的原位掺硫作用
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作者 马桂璇 徐子桐 +1 位作者 宁国庆 魏强 《山东化工》 CAS 2024年第14期60-64,共5页
沥青基碳材料在电化学领域中具有广泛的应用,例如Li^(+),Na^(+)和K^(+)电池领域,是优良的导电和储能材料。多年来,科学家们使用各种金属阳离子硫酸盐作为硫源,成功制备了具有不同硫含量的多功能沥青基碳材料。然而,对这些金属阳离子硫... 沥青基碳材料在电化学领域中具有广泛的应用,例如Li^(+),Na^(+)和K^(+)电池领域,是优良的导电和储能材料。多年来,科学家们使用各种金属阳离子硫酸盐作为硫源,成功制备了具有不同硫含量的多功能沥青基碳材料。然而,对这些金属阳离子硫酸盐掺硫效果的比较却讨论甚少。因此,了解金属阳离子硫酸盐对沥青基碳材料的影响至关重要。本文探究了金属阳离子硫酸盐对沥青基碳材料原位掺硫的影响。通过研究分解温度与掺硫量之间的关系,我们观察到掺硫量与金属阳离子硫酸盐分解温度之间存在线性关系。由此推断出掺硫速率(1.4%每100℃)和掺硫反应发生的起始温度(490.88℃)。掺硫剂的还原性对硫掺杂贡献显著,较高的还原性会导致较高的掺硫量。用MnSO_(4)掺杂的碳材料表面存在S_(8)和MnS杂质,可能在Li-S电池中具有潜在应用。用NiSO_(4)掺杂的材料表面存在Ni_(3)S_(4)杂质,可能在Ni-Zn电池中具有潜在应用。 展开更多
关键词 金属阳离子硫酸盐 石油沥青 原位掺硫 碳材料 电化学储能材料
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高价阳离子硫酸盐对混凝土早期强度的影响 被引量:5
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作者 要秉文 高振国 +1 位作者 梅世刚 姚少巍 《武汉理工大学学报》 CAS CSCD 2004年第11期26-28,45,共4页
研究了单掺高价阳离子硫酸盐对混凝土早期强度的影响 ,结果显示其对水泥、混凝土具有促凝作用 ,使混凝土早期强度降低。正交试验得出高价阳离子硫酸盐掺量为 0 .5 %、缓凝组分羟基羧酸为 0 .0 15 %时 ,混凝土的早期 1d、3d强度分别提高 ... 研究了单掺高价阳离子硫酸盐对混凝土早期强度的影响 ,结果显示其对水泥、混凝土具有促凝作用 ,使混凝土早期强度降低。正交试验得出高价阳离子硫酸盐掺量为 0 .5 %、缓凝组分羟基羧酸为 0 .0 15 %时 ,混凝土的早期 1d、3d强度分别提高 32 %和 17% ,而后期 2 8d强度无降低。机理分析表明 ,单掺高价阳离子硫酸盐能使水泥在水化初期迅速生成大量钙矾石而导致速凝 ,但恰当复合缓凝组分后既能使钙矾石难以过快生成避免速凝 ,从而发挥其有利方面的作用 ;又能因其含有硫酸根和高价离子 ,前者可生成较多的 AFt,后者聚沉作用强 ,加快硅酸盐矿物的水化 ,生成更多的C- S- H,使结构更加密实 。 展开更多
关键词 高价阳离子硫酸盐 早期强度 水化 聚沉
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钠离子对芦苇硫酸盐黑液木素CO_2气化特性的影响 被引量:2
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作者 杨卿 阴秀丽 +2 位作者 吴创之 武书彬 郭大亮 《农业机械学报》 EI CAS CSCD 北大核心 2013年第3期137-141,共5页
为考察钠离子对芦苇硫酸盐黑液木素CO2气化特性的影响,采用热重-红外技术分别对水溶木素(WSL)、水不溶木素(WIL)和硫酸盐黑液(KBL)的失重特性进行了分析。由于钠离子的存在,在整个反应过程中WSL和KBL的热重(TG)曲线相似。虽然WSL和WIL... 为考察钠离子对芦苇硫酸盐黑液木素CO2气化特性的影响,采用热重-红外技术分别对水溶木素(WSL)、水不溶木素(WIL)和硫酸盐黑液(KBL)的失重特性进行了分析。由于钠离子的存在,在整个反应过程中WSL和KBL的热重(TG)曲线相似。虽然WSL和WIL的化学结构相似,但是它们的CO2气化反应性却不同。在WSL的CO2气化过程中,木素化学结构上的钠离子对CO的形成具有控制作用。 展开更多
关键词 离子硫酸盐黑液木素 气化 热重-红外
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阳离子硫酸盐浆对纸张的增强作用
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作者 张学铭 宋先亮 +1 位作者 赵强 吴斌 《纸和造纸》 北大核心 2009年第6期29-31,共3页
就阳离子化改性的硫酸盐浆对纸张的增强作用进行了研究。红外光谱表明,阳离子化改性后丙烯酰胺和甲基丙烯酰氧基乙基三甲基氯化胺(MAETMAC)成功接枝到硫酸盐浆的纤维表面上。添加阳离子硫酸盐浆对纸张的增强效果明显。阳离子硫酸盐... 就阳离子化改性的硫酸盐浆对纸张的增强作用进行了研究。红外光谱表明,阳离子化改性后丙烯酰胺和甲基丙烯酰氧基乙基三甲基氯化胺(MAETMAC)成功接枝到硫酸盐浆的纤维表面上。添加阳离子硫酸盐浆对纸张的增强效果明显。阳离子硫酸盐浆所占比例为25%时,可以使抗张指数提高9.4%。阳离子硫酸盐浆对再生浆的增强作用表明,当阳离子硫酸盐浆所占比例为33%时,可使再生浆的抗张指数和耐破指数分别提高60%和71.9%。采用扫描电镜对其增强机理进行了初步研究。 展开更多
关键词 离子硫酸盐 增干强剂 红外光谱
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新型早强剂对混凝土性能的影响研究 被引量:14
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作者 要秉文 丁庆军 +1 位作者 梅世刚 姚少巍 《混凝土》 CAS CSCD 北大核心 2005年第9期49-54,共6页
以晶种、高价阳离子硫酸盐和羟基羧酸复合制成的新型早强剂,用其拌制的混凝土的工作性好,可以显著提高早期强度,降低坍落度损失和泌水,减少干缩。新型早强剂对水泥的适应性强,在低温下具有很好的早强效果,混凝土中水的冰点下降达2.6℃。... 以晶种、高价阳离子硫酸盐和羟基羧酸复合制成的新型早强剂,用其拌制的混凝土的工作性好,可以显著提高早期强度,降低坍落度损失和泌水,减少干缩。新型早强剂对水泥的适应性强,在低温下具有很好的早强效果,混凝土中水的冰点下降达2.6℃。XRD和SEM显示掺加新型早强剂的混凝土早期水化产物增多,结构密实,其抗渗、抗冻性能提高,耐久性好。 展开更多
关键词 新型早强剂 晶种 高价阳离子硫酸盐 混凝土性能
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低氯低碱新型混凝土早强剂的研究 被引量:6
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作者 要秉文 王彦平 +1 位作者 王庆华 张筠 《混凝土与水泥制品》 2006年第3期1-4,共4页
针对现行氯化物系和硫酸盐系早强剂存在的缺陷,利用晶种、高价阳离子硫酸盐和羟基羧酸为组分制成一种新型早强剂。它可以显著提高混凝土的早期强度,降低其坍损和泌水,以及减少其收缩。此外,新型早强剂对水泥的适应性强,在低温下具有良... 针对现行氯化物系和硫酸盐系早强剂存在的缺陷,利用晶种、高价阳离子硫酸盐和羟基羧酸为组分制成一种新型早强剂。它可以显著提高混凝土的早期强度,降低其坍损和泌水,以及减少其收缩。此外,新型早强剂对水泥的适应性强,在低温下具有良好的早强效果,其混凝土的抗渗、抗冻性能高,耐久性好,Cl-和Na+含量低,无钢筋锈蚀和碱-骨料反应的潜在危害。工程应用表明,这种早强剂具有很好的市场开发前景。 展开更多
关键词 早强剂 晶种 高价阳离子硫酸盐 离子 碱含量
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拜耳——烧结联合法氧化铝生产的中间产品中硫积累的预测
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作者 Н.С.мальц 汪谦益 《轻金属》 1984年第11期12-15,共4页
工业上采用烧结法从高硅铝土矿中制取氧化铝时,会在各种中间产品中积累硫酸盐。在一系列的中间产品中,若硫酸盐的积累达到一定的极限含量,就会恶化生产工艺指标和技术经济指标。
关键词 积累量 拜耳法 烧结法 铝酸钠 铝酸盐 硫酸盐离子 含水铝硅酸盐 中间产品 氧化铝 铝化合物 联合法
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Influence of alkylpyridinium ionic liquids on copper electrodeposition from acidic sulfate electrolyte 被引量:3
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作者 张启波 华一新 +1 位作者 任艳旭 陈立源 《Journal of Central South University》 SCIE EI CAS 2013年第8期2096-2102,共7页
The effect of two alkylpyridinium ionic liquids (py-iLs) including N-butylpyridinium hydrogen sulfate (BpyHSO4) and N-hexylpyridinium hydrogen sulfate (HpyHSO4) on the kinetics of copper electrodeposition from a... The effect of two alkylpyridinium ionic liquids (py-iLs) including N-butylpyridinium hydrogen sulfate (BpyHSO4) and N-hexylpyridinium hydrogen sulfate (HpyHSO4) on the kinetics of copper electrodeposition from acidic sulfate solution was investigated by cyclic voltammetry and potentiodynamic polarization measurements. Results from cyclic voltammetry indicate that these py-iLs have a pronounced inhibiting effect on CuE+ electroreduction and there exists a typical nucleation and growth process. Kinetic parameters such as Tafel slope, transfer coefficient and exchange current density obtained from Tafel plots, lead to the conclusion that py-iLs inhibit the charge transfer by slightly changing the copper electrodeposition mechanism through their adsorption on the cathodic surface. In addition, scanning electron microscope (SEM) and X-ray diffraction analyses reveal that the presence of these additives leads to more leveled and fine-grained cathodic deposits without changing the crystal structure of the electrodeposited copper but strongly affects the crystallographic orientation by significantly inhibiting the growth of (111), (200) and (311) planes. 展开更多
关键词 copper electrodeposition ADDITIVES ionic liquids electrokinetic parameter ADSORPTION
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Effect of Sulfate on Adsorption of Zinc and Cadmium by Variable Charge Soils *1 被引量:13
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作者 ZHANGGANGYA G.W.BRUMMER 《Pedosphere》 SCIE CAS CSCD 1998年第3期245-250,共6页
SO 4 2- and Zn 2+ or Cd 2+ were added to three variable charge soils in different sequences. In one sequence sulfate was added first, and in the other, Zn 2+ or Cd 2+ ... SO 4 2- and Zn 2+ or Cd 2+ were added to three variable charge soils in different sequences. In one sequence sulfate was added first, and in the other, Zn 2+ or Cd 2+ first. The addition of sulfate to the system invariably caused an increase in adsorption of the heavy metal added, with the effect more remarkable when the soil reacted with the sulfate prior to the metal. The shift in pH 50 for both Zn and Cd adsorption was also comparatively larger in the first sequence of reactions. It was suggested that the increase in negative charge density and the resultant negative potential of the soil were the primary cause of the pronounced effect of sulfate on adsorption of Zn or Cd, and the formation of the ternary surface complex S SO 4 M might also play a role in the effect. 展开更多
关键词 ADSORPTION CADMIUM SULFATE variable charge soil zinc
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Sorption Recovery of Gold Thiosulphate Complexes 被引量:1
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作者 A.G.Kholmogorov O.N.Kononova +1 位作者 G.L.Pashkov Y.S.Kononov 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第1期123-127,共5页
The gold sorption from thiosulphate solutions on carbon sorbents and on anion exchangers was studied. It was shown that the anion exchangers AV-17-10P and AP-100 are the most effective and selective at pH=5-8. These a... The gold sorption from thiosulphate solutions on carbon sorbents and on anion exchangers was studied. It was shown that the anion exchangers AV-17-10P and AP-100 are the most effective and selective at pH=5-8. These anion exchangers can be recommended for the gold recovery from the industrial solutions. 展开更多
关键词 GOLD thiosulphate complexes sorption recovery anion exchangers
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Effect of chelating agent on oxidation rate of aniline in ferrous ion activated persulfate system at neutral pH 被引量:12
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作者 张永清 谢晓芳 +1 位作者 黄少斌 梁海云 《Journal of Central South University》 SCIE EI CAS 2014年第4期1441-1447,共7页
In the interest of accelerating aniline degradation, Fe2+ and chelated Fe2+ activated persulfate oxidations were investigated in neutral pH condition. Three kinds of chelating agents were selected including citric aci... In the interest of accelerating aniline degradation, Fe2+ and chelated Fe2+ activated persulfate oxidations were investigated in neutral pH condition. Three kinds of chelating agents were selected including citric acid, oxalic acid and ethylenediamine tetraaceatate(EDTA) to maintain available Fe2+. The results indicate that the concentration of chelating agent and ferrous ion didn't follow a linear relationship with the degradation rate of aniline. A 1/1 ratio of chelating agent/Fe2+ results in a higher degradation rate compared to the results by other ratios. The oxidation enhancement factor using oxalic acid was found to be relatively low. In contrast, citric acid is more suitable chelating agent in the ferrous iron activated persulfate system and aniline exhibits a highest degradation with a persulfate/Fe2+/citric acid/aniline molar ratio of 50/25/25/1 compared to other molar ratios. 展开更多
关键词 chelating agent persulfate aniline ferrous ion
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Acid Release from an Acid Sulfate Soil Sample Under Successive Extractions with Different Extractants 被引量:5
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作者 C.LIN M.M.ISLAM 《Pedosphere》 SCIE CAS CSCD 2000年第3期221-228,共8页
An acid sulfate soil sample was successively extracted with deionized water, 1 mol L-1 KCl and 0.000 5 mol L-l Ca(OH)2 solutions. The results showed that only very small amounts of acidity were extracted by deionized ... An acid sulfate soil sample was successively extracted with deionized water, 1 mol L-1 KCl and 0.000 5 mol L-l Ca(OH)2 solutions. The results showed that only very small amounts of acidity were extracted by deionized water, possibly through slow jarosite hydrolysis. Acid release through jarosite hydrolysis was greatly enhanced by Ca(OH)2 extraction at the expense of the added OH- being neutralized by the acid released. Successive extraction of the sample with KCl removed the largest amounts of acidity from the sample. However, it is likely that the major form of acidity released by KCl extraction was exchangeable acidity. The results also show the occurrence of low or non charged Al and Fe species in water and Ca(OH)2 extracts after first a few extractions. It appears that such a phenomenon was related to a decreasing EC value with increasing number of extractions. 展开更多
关键词 acid release acid sulfate soil successive extractio`
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Biofimls Formation in Nanofiltration Membranes
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作者 Francisca Pessoa de Franca Renata Oliveira da Rocha Calixto +3 位作者 Virginia Carmen Rocha Bezerra Priscila Martins da Rocha Edna Teresa Ruas Bastos Celina Candida Ribeiro Barbosa 《Journal of Chemistry and Chemical Engineering》 2015年第2期113-123,共11页
Technological advances in the past 30 years have boosted the use of PSM (membrane separation processes), important for its efficiency and flexibility of operation. These processes can be used in many types of separa... Technological advances in the past 30 years have boosted the use of PSM (membrane separation processes), important for its efficiency and flexibility of operation. These processes can be used in many types of separation, with some advantages over the usual separation processes. NF (nanofiltration) is a membrane separation technique, which has properties intermediate between reverse osmosis and ultrafiltration in terms of separated species, because the average of the pores is in the range of 1/2 to 10 nm, and the separation occurs in function of load and size of the species. Usually removes species in solution with an effective diameter of about 1 nm or larger and multivalent ions to a greater extent than monovalent ions. The objective was to study the formation of biofouling on the surface of commercial nanofiltration membrane (Osmonics/GE) and surface membrane synthesized in our laboratory. The study was conducted in permeation system with filtration cell with tangential displacement of 15 bar for 8 days flow. DBNPA (2,2-dibromo-3-nitrilopropionamide) was used as a biocide agent, and an anti-fouling, in concentrations of 5 and 300 ppm, respectively, added to the water coming from the Beach Sea Galleon, RJ. The results demonstrated that there was no change in the flow and rejection of sulphate ions, even in the presence of anti-fouling. The count of aerobic, anaerobic and BRS (sulfate reducing bacteria) in seawater before and after using the DBNPA showed efficiency in controlling these groups of microorganisms and biofouling microbial consortium consisting of the existing in seawater. 展开更多
关键词 Nanofiltration membrane BIOFOULING BIOCIDE sulfate reducing bacteria seawater.
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解决羊毛后整理问题 被引量:1
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作者 张裕 《纺织信息周刊》 2004年第16期32-32,共1页
关键词 硫酸氢盐 后整理 永久定形 二硫桥键 还原剂 羊毛织物 处理槽 定形度 酸氢钠 硫酸盐离子
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Degradation of limestone calcined clay cement(LC^(3))mortars under sulfate attack
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作者 Cheng Yu Zhen Li Jiaping Liu 《Low-carbon Materials and Green Construction》 2023年第1期34-47,共14页
Limestone Calcined Clay Cement(LC^(3)) is a newly proposed low-carbon cement,which can effectively reduce energy consumption and carbon emissions of the traditional cement industry without changing the basic mechanica... Limestone Calcined Clay Cement(LC^(3)) is a newly proposed low-carbon cement,which can effectively reduce energy consumption and carbon emissions of the traditional cement industry without changing the basic mechanical properties of cement-based materials.In this study,the degradation process of mortar samples of limestone and calcined clay cementitious material under sulfate attack is studied by both macroscopic and microscopic analysis.The results show that compared with pure Portland cement,the addition of calcined clay and limestone can significantly reduce the expansion rate,loss of dynamic modulus and mass loss of mortar specimens under sulfate attack.The addition of calcined clay and limestone will refine the pore size distribution of mortar specimens,then inhibiting the diffusion of sulfate and formation of corrosive products,therefore leading to a significant improvement of the sulfate resistance. 展开更多
关键词 Limestone Calcined Clay Cement(LC^(3)) Sulfate attack Expansion Sulfate penetration profiles Corrosion product
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