高活性氧化铜的制备工艺研究

以硫酸铜、氢氧化钠为主要原料，采用络合沉淀法，通过加入合适的助剂制得高活性氧化铜。研究了助剂种类、络合剂种类等对产品质量的影响，确定了最佳反应条件。XRD、SEM及光学显微等分析结果表明，产品中只存在单一的氧化铜相，产品的分散性较好，呈近似球状颗粒，粒径在1-2μm左右。化学分析结果表明，活性氧化铜的纯度在99％以上、溶解时间为15s左右。

活性氧化铜粉的工艺条件研究

研究开发了一条由纯铜片制备电镀级活性氧化铜粉的工艺方法。以铜片为原料,经过碳酸氢铵和氨水溶铜,常压脱氨,焙烧三阶段得到活性氧化铜粉。用SEM、ICP等方法对所得的活性氧化铜粉的性能进行了表征,结果表明,采用该法得到的活性氧化铜粉纯度达到99%以上,金属杂质含量和溶解速度完全符合电镀级氧化铜粉的要求,可以直接用到线路板的电镀工序。

一种利用酸性蚀刻废液制备活性氧化铜粉的方法

本研究提出了一种利用酸性蚀刻废液制备活性氧化铜粉的方法,主要步骤有除杂、合成碱式氯化铜中间体、氨转生成氢氧化铜、氢氧化铜碱转生成氧化铜、水洗、烘干、煅烧,合成的氧化铜粉的Cu O%大于99.0%,具有较低的杂质含量和较快的溶解速率(小于30 s)。

活性氧化铜的制备研究

以硫酸铜、氢氧化钠为原料,经沉淀转化反应、过滤、洗涤、烘干、研磨处理得到活性氧化铜。研究了硫酸铜溶液浓度、氢氧化钠溶液浓度、反应温度、反应时间、干燥温度、助剂、研磨等因素对产量和质量的影响,并提出了最佳条件。产品质量符合特定要求,1g样品于20m L浓度为20%硫酸溶液中的溶解时间在20~30s之间,再现性好,含量达到99%以上。

活性氧化铜及其制取方法研究进展

介绍了活性氧化铜的主要用途、市场需求,叙述了曾经使用过的该产品活性的主要测试方法及我国新近颁布的该产品行业标准中给出的规范、统一的活性测试方法,评述了直接沉淀法、低温氧化湿法分解法、溶铜-脱氨法、络合沉淀法等活性氧化铜目前主要制取方法的工艺过程、技术特点和产品质量等研究现状,分析了各制取方法的主要优点及尚存在的主要不足。认为活性氧化铜及其制取方法的发展趋势是,对现有溶铜-蒸氨法工艺进行深入研究,提出有效的改进措施,进一步提升产品的活性、流动性等品质,改善其应用性能等。

活性纳米氧化铜的制备

以硫酸铜为原料,通过在反应中引入合适的助剂,采用沉淀转化法制备出活性纳米氧化铜产品。研究了助剂加入量、加碱时间、反应物的质量浓度、反应温度等因素对产品质量的影响,通过实验确定了最佳反应条件。经过产品性能检测,产品粒径达到了60 nm,满足了境外某公司对产品性能的要求。

Buffer anion effects on water oxidation catalysis: The case of Cu(Ⅲ) complex

Water oxidation is the bottleneck of artificial photosynthesis.Since the first ruthenium-based molecular water oxidation catalyst,the blue dimer,was reported by Meyer’ s group in 1982,catalysts based on transition metals have been widely employed to explore the mechanism of water oxidation.Because the oxidation of water requires harsh oxidative conditions,the stability of transition complexes under the relevant catalytic conditions has always been a challenge.In this work,we report the redox properties of a CuⅢ complex(TAML-CuⅢ] with a redox-active macrocyclic ligand(TAML) and its reactivity toward catalytic water oxidation.TAML-CuⅢ displayed a completely different electrochemical behavior from that of the TAML-CoⅢ complex previously reported by our group.TAML-CuⅢ can only be oxidized by one-electron oxidation of the ligand to form TAML·+-CuⅢand cannot achieve water activation through the ligand-centered proton-coupled electron transfer that takes place in the case of TAML-CoⅢ.The generated TAML·+-CuⅢ intermediate can undergo further oxidation and ligand hydrolysis with the assistance of borate anions,triggering the formation of a heterogeneous B/CuOx nanocatalyst Therefore,the choice of the buffer solution has a significant influence on the electrochemical behavior and stability of molecular water oxidation catalysts.

Catalytic ozonation of phenol and oxalic acid with copper-loaded activated carbon

A novel heterogeneous catalytic ozonation process in water treatment was studied, with a copper-loaded activated carbon （Cu/AC） that was prepared by an incipient wetness impregnation method at low temperature and tested as a catalyst in the ozonation of phenol and oxalic acid. Cu/AC was characterized using XRD, BET and SEM techniques. Compared with ozonation alone, the presence of Cu/AC in the ozonation processes significantly improves the degradation of phenol or oxalic acid. With the introduction of the hydroxyl radical scavenger, i.e., turt-butanol alcohol （t-BuOH）, the degradation efficiency of both phenol and oxalic acid in the Cu/AC catalyzed ozonation process decreases by 22% at 30 min. This indicates that Cu/AC accelerates ozone decomposition into certain concentration of hydroxyl radicals. The amount of Cu（II ） produced during the reaction of Cu/AC-catalyzed ozonation of phenol or oxalic acid is very small, which shows that the two processes are both heterogeneous catalytic ozonation reactions.

Synergistic effects of CuO and Au nanodomains on Cu_2O cubes for improving photocatalytic activity and stability

Cu2O is a promising photocatalyst,but it suffers from poor photocatalytic activity and stability,especially for Cu2O cubes.Herein,we report the deposition of CuO and Au nanodomains on Cu2O cubes to form dual surface heterostructures(HCs)to improve photocatalytic activity and stability.The apparent quantum efficiency of Au/CuO/Cu2O HCs was ca.123 times that of pristine Cu2O.In addition,the Au/CuO/Cu2O HCs maintained nearly 80%of its original activity after eight cycles in contrast to five cycles for the Au/Cu2O material.Therefore,CuO and Au domains greatly improved the photocatalytic activity and stability of the Cu2O cubes due to the synergistic effect of the HCs.

Removal of Cu(Ⅱ) from Aqueous Solution Using a Novel Crosslinked Alumina-Chitosan Hybrid Adsorbent

A novel biosorbent was developed by coating chitosan, a naturally and abundantly available biopolymer, on to activated alumina based on oil shale ash via crosslinking. The adsorbent was characterized by various techniques, such as Fourier transform infrared spectroscopy, scarming＇ elec.tron micros cop.y, the rmogravimetric-differentialthermal analysis, and X-ray photoelectron spectroscope. Batch isothermal equilibrium adsorption experiments were condcted to evaluate the adsorbent for the removal of Cu（Ⅱ） from wastewater. The effect of pH and agitation time on the adsorption capacity was also investigated, indicating that the optimum pH was 6.0. The equilibrium adsorp-tion data were correlated with Langmuir and Freundlich models. The maximum monolayer adsorption capacity of chitosan coated alumina sorbent as obtained from Langmuir adsorption isotherm was fotmd to be 315.46 mg.g-1 for Cu（Ⅱ）. The adsorbent loaded with Cu（Ⅱ） was readily regenerated using 0.1 mol.L-1 sodium hydroxide solution. All these indicated that chitosan coated alumina adsorbent not only have high adsorption activity, but also had good stability in the wastewater treatment process.

Combined effects of water temperature and copper ion concentration on catalase activity in Crassostrea ariakensis

A central composite experimental design and response surface method were used to investigate the combined effects of water temperature(18–34℃) and copper ion concentration(0.1–1.5 mg/L) on the catalase(CAT) activity in the digestive gland of C rassostrea ariakensis. The results showed that the linear effects of temperature were significant(P <0.01), the quadratic effects of temperature were significant( P <0.05), the linear effects of copper ion concentration were not significant(P >0.05), and the quadratic effects of copper ion concentration were significant(P <0.05). Additionally, the synergistic effects of temperature and copper ion concentration were not significant(P >0.05), and the effect of temperature was greater than that of copper ion concentration. A model equation of CAT enzyme activity in the digestive gland of C. ariakensis toward the two factors of interest was established, with R 2, Adj. R 2 and Pred. R 2 values as high as 0.943 7, 0.887 3 and 0.838 5, respectively. These findings suggested that the goodness of fit to experimental data and predictive capability of the model were satisfactory, and could be practically applied for prediction under the conditions of the study. Overall, the results suggest that the simultaneous variation of temperature and copper ion concentration alters the activity of the antioxidant enzyme CAT by modulating active oxygen species metabolism, which may be utilized as a biomarker to detect the effects of copper pollution.

氨对Cu/AC脱硫剂的选择性还原再生

通过XRD和EXAFS等表征技术对活性焦担载氧化铜脱硫剂在NH3 气氛中的再生行为进行了表征 ,发现再生过程中NH3 仅将硫化所生成CuSO4 中的SO4 2 -选择性还原为SO2 ,而未与Cu2 +发生反应 ,保持了铜物种在活性焦表面良好的分散性 。

Synthesis and Enhanced Photocatalytic Activity of Regularly Shaped Cu2O Nanowire Polyhedra

A series of unique nanowire superstructures, Cu2O nanowire polyhedra, have been synthesized through a cost-effective hydrothermal route. Three types of nanowire polyhedra, namely octahedra, concave octahedra, and hexapods, were formed in high morphological yields （90%） by reducing cupric acetate with o-anisidine or o-phenetidine in the presence of carboxylic acids. The architectures of these Cu2O nanowire polyhedra were examined by electron microscopy, which revealed ordered, highly aligned CU2O nanowires within the polyhedral outlines. The growth of the Cu2O nanowire polyhedra is controlled by the orientation and growth rates of the nanowire branches which are adjusted by addition of carboxylic acids. Compared to the Cu2O samples reported in the recent literature, the Cu2O nanowire octahedra exhibit notably enhanced photocatalytic activities for dye degradation in the presence of H202 under visible light, probably due to the high-density charge carriers photoexcited from the branched nanowires with their special structures. Additionally, the discussion in the recent literature of the photocatalytic activity of Cu2O in the absence of H2O2 for direct photodegradation of dyes seems questionable.