Flotation of quartz using N-(2-aminoethyl)-octadecanamide as collector

The flotation behavior of quartz using N-(2-aminoethyl)-octadecanamide (AEOA ) as a collector was investigated.Zeta potential and infrared spectra were conducted to investigate the mechanism of the interaction of the quartz surface with the collector molecules. The results show that electrostatic force and hydrogen bond play an important role in governing the mechanism of flotation in acidic and alkaline media. The recoveries of quartz are (99.0%)-99.8% in the pH range of 3-11. The recovery of quartz is less dependent on AEOA concentration, mainly due to the formation of micellae in aqueous solution,and the adsorption density of AEOA on the quartz surface nearly remains constant.

SYNTHESIS OF 1－（2－AMINOETHYL） PIPERAZINE RESIN AND ITS ADSORBABILITYFOR NOBLE METALLIC IONS

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Synthesis and Structure of [Cu_2(μ-NO_2)(aepy)_4](ClO_4)_3 (aepy = 2-(2-Aminoethyl)pyridine)

The title compound [Cu2(m-NO2)(aepy)4](ClO4)3 (Cu2C28H40N9Cl3O14, Mr = 960.12, aepy = 2-(2-aminoethyl)pyridine) was synthesized and its crystal structure was determined by X-ray diffraction method. It crystallizes in monoclinic, space group C2/c with cell parameters: a = 21.958(3), b = 12.205(2), c = 15.180(3) ? b = 106.06(1), V = 3909.5(12) ?, Z = 4, Dc = 1.631 g/cm3, F(000) = 1968 and m(MoKa) = 1.368 mm-1. The structure was solved by direct methods and refined by full-matrix least-squares techniques. The final R = 0.0734 and wR = 0.1954 for 1606 observed reflections with I ≥2.0s(I). The crystal structure revealed that the [Cu2(m-NO2)(aepy)4]3+ cation consists of two square-based pyramidal copper (Ⅱ) atoms bridged by one nitrate anion. The distance between the two copper atoms (Cu(1)…Cu(1A)) is 5.373 (2) ?

A New Thionine Modified Electrode by Anchorage to Bi-(2-aminoethyl)-aminodithiocarboxyl Acid Self-assembled Monolayers through Coordination with Cu^(2+#)

A new method for preparing chemically modified gold electrode by anchoring thionine to self-assembled bi - (2 -aminoethyl) -aminodithiocarboxyl acid(BANTC) monolayers through coordination with Cu2+ is described. This thionine modified electrode exhibits two-new redox couples.Two protons were involved in the electrochemical process undergone by the couple I in the pH range of 5.0-10.0. The apparent surface electron transfer rate constant is about 0.050s-1.

Synthesis and Crystal Structure of a [Cu(HTren)Cl_2]ClO_4·H_2O Complex (Tren = Tris(2-aminoethyl)amine)

The title complex [Cu（HTren）Cl2]ClO4·H2O （Tren = tris（2-aminoethyl）amine） was synthesized by the reaction of Cu（ClO4）2·6H2O with Tren.3HCl in water and methyl alcohol. The crystal （CuC6H21Cl3N4O5） is of triclinic, space group P1, with a = 8.2689（2）, b = 8.4503（3）, c = 11.6801（4） A, α= 96.9350（10）, β= 108.2440（10）, y = 90.7550（10）°, V= 768.32（4）A^3, Z = 2, Mr= 399.16, D,.= 1.725 g/cm^3,μ= 1.962 mm^-1, F（000） = 410, T= 293（2） K, the final R = 0.0479 and wR = 0.1339 for 2659 observed reflections with I 〉 2σ（I）. X-ray single-crystal structure analysis reveals that the copper（Ⅱ） atom adopts a slightly distorted square-pyramidal geometry. The distances between Cu and N atoms （N（1）, N（2）, N（3）） range from 1.975（4） to 2.116（3）A,. The bond lengths of Cu-Cl（1） and Cu-Cl（2） are 2.309（10） and 2.591（10） A, respectively. The whole crystal presents a three-dimensional network structure by hydrogen bonds.

Low-temperature heat capacities and standard molar enthalpy of formation of 4-(2-aminoethyl)-phenol (C_8H_(11)NO)

This paper reports that low-temperature heat capacities of 4-（2-aminoethyl）-phenol （C8H11NO） are measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. A polynomial equation of heat capacities as a function of the temperature was fitted by the least square method. Based on the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15K were calculated and tabulated at the interval of 5K. The energy equivalent, εcalor, of the oxygen-bomb combustion calorimeter has been determined from 0.68g of NIST 39i benzoic acid to be εcalor=（14674.69±17.49）J·K^-1. The constant-volume energy of combustion of the compound at T=298.15 K was measured by a precision oxygen-bomb combustion calorimeter to be ΔcU=-（32374.25±12.93）J·g^-1. The standard molar enthalpy of combustion for the compound was calculated to be ΔcHm = -（4445.47 ± 1.77） kJ·mol^-1 according to the definition of enthalpy of combustion and other thermodynamic principles. Finally, the standard molar enthalpy of formation of the compound was derived to be ΔfHm（C8H11NO, s）=-（274.68 ±2.06） kJ·mol^-1, in accordance with Hess law.

Hexavalent Chromium Removal and Reduction to Cr (III) by Polystyrene Tris(2-aminoethyl)amine

A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) concentration on adsorption was studied. The optimum pH for the removal of Cr (VI) was at pH 5, while optimum contact time and adsorbent dosage were 120 minutes and 10 g/L, respectively. Total chromium and Cr (VI) concentrations were analyzed by ICP-MS and UV-Visible. Adsorption isotherms using Langmuir and Freundlich isotherm models revealed that the data fitted Langmuir isotherm model better than Freundlich with a maximum adsorption capacity of 312.27 mg/g. FTIR spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analyses were performed on the adsorbent before and after binding Cr (VI). All analyses confirmed the complexation of Cr (VI) to the adsorbent. Desorption experiments using KCl solution indicated 89.3% release of chromium, rendering this method of high potential for adsorbent regeneration.

Removal of Lead Ions from Wastewater Using Functionalized Multiwalled Carbon Nanotubes with Tris(2-Aminoethyl)Amine

Recently, many attempts have been made to use carbon nanotubes in analytical chemistry, especially in adsorption of heavy metal ions from water. In this study, multiwalled carbon nanotubes (MWCNTs) were functionalized with tris(2-aminoethyl) amine. The functionalized nanoparticles were characterized using Fourier transform infrared (FTIR), thermal gravimetric analyzer (TGA), elemental analysis, and Raman spectroscopy. The results revealed that the functionalization reaction was successfully accomplished. Lead adsorption from water was carried out using functionalized MWCNTs and measured by flame atomic absorption spectrometry (FAAS). The effects of pH, shaking time, initial metal ion concentration, and adsorbent dosage on the adsorption process were studied via batch method. The results obtained showed that removal of lead ions strongly depended on the pH. Desorption study revealed that lead ions adsorbed on the functionalized MWCNTs could be desorbed at pH 3 due to breakage of complexes formed on the sorbent surface. Maximum adsorption capacity of the sorbent under the optimal conditions was 43 mg/g. This favorable adsorption capacity suggests that functionalized carbon nanotubes can be applied for removal of lead from water solutions. The data obtained were fitted with the Langmuir and Freundlich isotherm adsorption models and Langmuir model showed better agreement with the experimental data.

Response Surface Methodology as an Approach for Optimization of the Synthesis of 1-(2-Aminoethyl)-2-imidazolidone

Ruthenium loaded on activated carbon pre-treated by HNO3 was used to catalyze the reaction of 1-(2-Aminoethyl)-2-imidazolidone (AEI) synthesized from ethylenediamine, ethanolamine and CO2. Response surface methodology (RSM) based on Box-Behnken design (BBD) was employed to optimize the synthesis of AEI. The statistical analysis results showed that the yield of AEI was significantly affected by the CO2 pressure, reaction temperature and reaction time. According to the results of variance analysis, the value of the determination coefficient of 0.9854 was in reasonable agreement with the “Adj R-Squared” of 0.9666, which means this model can predict the yield of AEI well and can be used to optimize reaction conditions for higher AEI yield. The optimal values of AEI yield predicted by RSM was 84.9% under temperature 206.51?C, CO2 pressure 9.35 Mpa, reaction time 10.11 h, and the verification experiment yield of AEI was 83.1%.

叶面喷施胺鲜酯及其与油菜素内酯复配液对油用牡丹生理特性及产量的影响

为筛选出适合油用牡丹高产高效栽培中的植物生长调节剂应用技术,本试验以凤丹为材料,分别于盛花期(4月7日)、籽粒形成期(4月18日)、果荚与籽粒快速生长期(5月10日)叶面喷施不同质量浓度的胺鲜酯(D1、D2和D3)及其与油菜素内酯复配液(BD1、BD2和BD3),研究其对植株生理特性、籽粒产量指标(百粒重、单果籽粒重、单株籽粒重及籽粒产量)的影响。结果表明,与对照组相比,喷施植物生长调节剂处理的牡丹叶片生理特性和籽粒产量关键参数均有明显提高:7月3日时,BD2处理叶片SOD活性较对照显著提高5.24%;5月19日和7月3日时,所有处理叶片MDA含量均较对照显著降低;7月3日时,所有处理叶片可溶性糖含量与对照均有显著性差异,其中BD2处理最高,较对照增加33.84%;6月10日时,所有处理叶片总叶绿素含量均显著高于对照,其中BD3处理增幅最大,为98.11%;3个测定时期,除6月10日的BD3处理外其他处理叶片净光合速率均显著高于对照,且随着胺鲜酯质量浓度的提高呈现先增加后降低趋势。所有处理单株籽粒重及籽粒产量均显著高于对照,其中BD3增幅均最大,分别为10.45%与10.44%。相关性分析表明,SOD活性与Chl a、Chl b、Car、总叶绿素含量和净光合速率呈极显著正相关,与可溶性糖含量呈显著正相关,与MDA含量呈极显著负相关;总叶绿素含量与净光合速率呈极显著正相关,净光合速率与单果籽粒重、单株籽粒重和籽粒产量呈显著正相关。综之,12、16 mg/L胺鲜酯与0.05 mg/L油菜素内酯复配喷施油用牡丹植株的生理特性表现优异,并可获得较高籽粒产量。

1,3-二(2′-氨基亚乙基)-2-甲基咪唑溴盐与环氧树脂E-51的固化工艺

通过咪唑环上的季铵化反应,制备一种适用于环氧树脂的双氨基咪唑类离子液体固化剂1,3-二(2′-氨基亚乙基)-2-甲基咪唑溴盐(DAIL)。以环氧树脂E-51作为基体树脂,深入研究DAIL作为固化剂的固化工艺条件和固化物的性能。结果表明,DAIL可作为环氧树脂E-51的中温固化剂使用,二者的最佳质量比为DAIL∶E-51=20∶100,最佳固化温度范围为74~105℃,后固化温度为162℃,固化后的浇注体样条抗拉强度为159 MPa,弹性模量为2281 MPa,断裂伸长率为12.8%,热分解温度为424.4℃。DMA分析表明DAIL/E-51浇注体最大损耗因子tanδ为0.56,玻璃转化温度θg为83℃,对应的贮存模量E为290 MPa,交联密度为30149 mol·m^(-3)。该结果为高力学性能中温环氧树脂固化剂的使用提供了重要实验依据。

用于玻纤布表面处理的一种苯乙烯基氨基硅烷偶联剂的合成与表征

以N-(2-氨乙基)-3-氨丙基三甲氧基硅烷和对氯甲基苯乙烯为原料进行亲核取代反应,成功合成了3-(N-苯乙烯基甲基-2-氨基乙基氨基)丙基三甲氧基硅烷偶联剂,并通过核磁氢谱、气相色谱质谱联用仪、高效液相色谱和傅立叶红外光谱进行表征。考察了物料比、反应温度、不同阻聚剂和缚酸剂的种类对反应的影响以及溶剂的选择对产品外观的影响。最优反应条件为:N-(2-氨乙基)-3-氨丙基三甲氧基硅烷与对氯甲基苯乙烯的物质的量之比为1.0∶1,反应温度为80℃,对苯二酚作阻聚剂,三乙胺作缚酸剂,甲苯或苯作溶剂。在最优反应条件下,反应转化率达到100%,产品透明度较好。

胺鲜酯与氯化钙配施对烤烟育苗的影响

以云烟87为材料,研究8%胺鲜酯(DA-6)(质量浓度15.0、10.0、5.0μg/L)与10.0 mmol/L氯化钙配施对烤烟育苗的影响。结果表明:与清水对照相比,播种7d和15d后配施处理的烤烟出苗率分别提高4.50%~10.40%、2.74%~8.33%,成苗率提高3.19%~8.81%;成苗期的苗高、茎基宽、最大叶叶面积分别提高了5.99%~17.66%、1.29%~5.47%、21.1%~73.6%;根、茎、叶、全苗干物质积累量分别提高了25.0%~55.0%、16.7%~33.3%、14.1%~33.8%、16.5%~36.9%,根冠比提高了9.1%~17.0%;配施处理的叶片叶绿素(叶绿素a+叶绿素b)含量增加26.0%~64.9%;配施处理硝酸还原酶活性提高了52.1%~95.9%;过氧化氢酶(CAT)活性、过氧化物酶(POD)活性、超氧化物歧化酶(SOD)活性及丙二醛(MDA)含量分别降低了41.5%~59.3%、27.9%~62.9%、30.3%~81.1%和34.0%~63.7%,表明用10μg/L DA-6+10 mmol/L氯化钙配施浸种效果最佳。

Highly Selective Salicylate Membrane Electrode Based on N,N＇- （Aminoethyl）ethylenediamide Bis（2-salicylideneimine） Binuclear Copper（Ⅱ） Complex as Neutral Carrier

A new ion selective electrode for salicylate based on N,N＇-（aminoethyl）ethylenediamide bis（2-salicylideneimine） binuclear copper（Ⅱ） complex [Cu（Ⅱ）2-AEBS] as an ionophore was developed. The electrode has a linear range from 1.0 × 10^-1 to 5.0 ×10^-7 mol·L^- 1 with a near-Nemstian slope of （ - 55 ±1 ） mV/decade and a detection limit of 2.0 × 10-7 mol·L^-1 in phosphorate buffer solution of pH 5.0 at 25 ℃. It shows good selectivity for Sal^- and displays anti-Hofmeister selectivity sequence： Sal^-〉SCN^-〉 ClO4^- 〉I^-〉 NO2^- 〉Br^-〉 NO3^- 〉Cl^-〉 SO3^2- 〉 SO4^2- The proposed sensor based on binuclear copper（Ⅱ）complex has a fast response time of 5-10 s and can be used for at least 2 months without any major deviation. The response mechanism is discussed in view of the alternating current （AC） impedance technique and the UV-vis spectroscopy technique. The effect of the electrode membrane compositions and the experimental conditions were studied. The electrode has been successfully used for the determination of salicylate ion in drug pharmaceutical preparations.

GC-MS/MS法测定大米、砀山梨及娃娃菜中胺鲜酯的残留量

建立了一种适用于气相色谱-串联质谱联用仪测定蔬菜、水果、粮谷中胺鲜酯残留量的分析方法。试样经过乙腈提取,QuEChERS dSPE EMR-Lipid(大米试样)、PSA、C_(18)及GCB(砀山梨和娃娃菜试样)净化后,以HP-5MS色谱柱进行分离,在电子轰击离子源、多反应监测模式下检测大米、砀山梨和娃娃菜中胺鲜酯的残留量,基质外标法定量。结果表明,胺鲜酯浓度在2~200 ng·mL^(-1)时,线性关系良好,相关系数(r)均在0.9999以上,在3个不同浓度添加水平下,大米胺鲜酯的回收率为92.4%~105.0%,砀山梨胺鲜酯的回收率为84.0%~90.0%,娃娃菜胺鲜酯的回收率为93.6%~112.0%,大米的方法检出限为0.002 mg·kg^(-1),定量限为0.004 mg·kg^(-1);砀山梨和娃娃菜的检出限为0.001 mg·kg^(-1),定量限为0.002 mg·kg^(-1)。方法精密度试验的相对标准偏差在5%以内。该方法适用于蔬菜、水果、粮谷中胺鲜酯的定性和定量测定。

胺鲜酯对树番茄幼苗养分吸收和生理指标的影响

【目的】探究不同质量浓度胺鲜酯对树番茄幼苗养分吸收与生理指标的影响,以筛选利于树番茄幼苗养分吸收及生理调节的最适胺鲜酯质量浓度。【方法】以树番茄幼苗为材料,喷施不同质量浓度的胺鲜酯(10、20、30和40 mg/L),分析其对树番茄幼苗养分吸收及生理指标的影响。【结果】不同质量浓度的胺鲜酯可显著提高树番茄幼苗的全氮和全磷含量,20和30 mg/L胺鲜酯可显著提高其全钾含量;30 mg/L胺鲜酯处理下,树番茄幼苗根系全氮、全磷和全钾的含量分别较对照提高50.19%、44.76%和18.61%,地上部分全氮、全磷和全钾的含量分别较对照提高43.12%、30.11%和39.08%。与对照相比,30 mg/L胺鲜酯处理时,树番茄幼苗根系及地上部分的单株生物量均达到最大,分别为0.216和0.847 g;光合色素含量、SOD和CAT活性以及可溶性蛋白含量均显著升高,POD活性则显著降低61.82%。【结论】胺鲜酯能够促进树番茄幼苗的养分吸收与生理调节,且最适胺鲜酯质量浓度为30 mg/L。

胺鲜酯和2,4-二氯苯氧乙酸协同诱导裂殖壶菌积累DHA

目前添加植物生长调节剂是一种促进裂殖壶菌中二十二碳六烯酸(DHA)积累以及提高其产量很有潜力的策略。添加单一植物生长调节剂促进裂殖壶菌DHA积累已有报道,但同时添加两种植物生长调节剂协同促进裂殖壶菌中DHA积累鲜见报道。本工作采用合成植物生长调节剂胺鲜酯(DA-6)和2,4-二氯苯氧乙酸(2,4-D)协同诱导裂殖壶菌积累DHA,提高DHA含量和产量,以DHA为指标优化了DA-6和2,4-D的最佳协同浓度。结果表明:0.05mg/L DA-6和0.5mg/L 2,4-D协同处理裂殖壶菌,裂殖壶菌生物量和油脂含量没显著增加,但DHA含量和产量显著增加,分别达到58.32%和5.17g/L,相比于单独添加DA-6分别增加17%和23%,相比于未添加植物生长调节剂的空白对照组分别增加了48%和48%。本研究表明适宜浓度的合成植物生长调节剂可协同诱导裂殖壶菌中DHA的积累,提高DHA产量,为大规模工业化生产DHA提供新的思路和策略。

采前喷施胺鲜酯对采后‘巨峰’葡萄果实品质和活性氧代谢的影响

‘巨峰’葡萄果实采后活性氧(reactive oxygen species,ROS)代谢旺盛,导致其贮藏期缩短,商业价值降低。本研究使用不同质量浓度(0(对照)、10、30、50、70 mg/L)胺鲜酯(diethyl aminoethyl hexanoate,DA-6)对转色期葡萄进行喷施处理,探讨DA-6处理对采后‘巨峰’葡萄果实品质和ROS代谢的影响。通过测定与品质相关的生理指标,发现DA-6处理明显降低了葡萄果实质量损失,并延缓了葡萄果实硬度、可溶性固形物含量的下降,其中质量浓度50 mg/L DA-6处理效果最佳;与对照组相比,50 mg/L DA-6处理可明显提升果实中超氧化物歧化酶、抗坏血酸过氧化物酶、过氧化氢酶、谷胱甘肽还原酶活力以及1,1-二苯基-2-三硝基苯肼自由基清除率和总还原能力,同时也能够抑制还原型抗坏血酸、还原型谷胱甘肽含量下降,降低超阴氧离子自由基产生速率和丙二醛含量。综上所述,采前喷施DA-6维持了采后葡萄果实ROS清除系统的稳定性,将ROS代谢维持在一个相对平衡的状态,减轻了氧化损伤,延缓了果实衰老,延长了‘巨峰’葡萄果实的货架期。

原位化学诱导相转化法聚氯乙烯超滤膜的研制

针对超滤膜亲水性不足、渗透性和选择性不能平衡的问题,设计了简便高效的原位化学诱导相转化法,在铸膜液中加入可与聚氯乙烯(PVC)的C-Cl键反应的含-NH2的改性剂N-β-氨乙基-γ-氨丙基三甲氧基硅烷(KH792),制备了PVC超滤膜.探究了KH792含量对PVC膜结构和性能的影响,结果表明,随着KH792质量分数从0%增加到12%,PVC膜的平均孔径由56.84 nm增加到86.33 nm,孔径分布相对原膜更加均一;孔隙率由62%提高到88%;初始接触角由87.5°降到70.68°,120 s内动态接触角下降范围由8°增加到20°,亲水性得到提升;在保证牛血清白蛋白(BSA)截留率为95%左右的同时,纯水通量由46 L/(m^(2)·h)增加到539L/(m^(2)·h).

采前喷施胺鲜酯对葡萄果实贮藏期间膜脂代谢的影响

为探讨采前喷施胺鲜酯对采后‘巨峰’葡萄果实贮藏期间膜脂质代谢的影响,分别使用蒸馏水(对照)和50mg/L胺鲜酯(diethyl aminoethyl hexanoate,DA-6)对转色期的‘巨峰’葡萄进行喷施处理,成熟后,将葡萄于(0±1)℃、相对湿度65%~70%条件下贮藏,并在贮藏的第0、20、30、40、50、60天采集葡萄果皮进行细胞膜相关指标测定。结果显示,与对照组相比,DA-6处理可有效抑制采后果实贮藏期间果皮细胞膜相对渗透率上升;较好地维持果皮脂质氧合酶(lipoxygense,LOX)、脂酶和磷脂酶D(phospolipaseD,PLD)活力;抑制果皮磷脂酰胆碱、磷脂酰肌醇含量的下降和磷脂酸含量的升高;保持较高的亚油酸和亚麻酸等不饱和酸的相对含量和硬脂酸、山嵛酸、花生酸和棕榈油酸等饱和脂肪酸的相对含量,将果皮中脂肪酸不饱和度维持在较高水平;抑制LOX、Lipase和PLD基因的表达。综上,采前喷施50mg/LDA-6处理可通过有效延缓贮藏期‘巨峰’葡萄果实细胞膜脂质代谢,延缓果实的衰老,并延长其贮藏期,为葡萄贮藏保鲜提供了参考。