天然气和氧偶联制环氧乙烷催化剂的反应性能

研制了天然气和氧经偶联反应制环氧乙烷的Ａｇ－Ｂａ－Ｃｓ／Ａｌ２Ｏ３催化剂（ＮＥＯ－１）。用Ｎ２＋Ｏ２＋Ｃ２Ｈ４和偶联产物气加氧作原料气，在２５０℃，空速２５００ｈ＾－１时，乙烯转化率和ＥＯ选择性分别达到了３０％和８０％，ＮＥＯ－１催化具有适宜的比表面和孔结构，用ＸＰＳ分析发现，与新鲜的催化相比，经活化和反应后的催化剂表面的Ｂａ，Ｃｓ原子浓度增高，并具有较多的吸附氧物种。     

HIGH ACTIVITY FUSED IRON CATALYST FOR CO HYDROGENATION TO HIGHER ALCOHOLS

ＨＩＧＨＡＣＴＩＶＩＴＹＦＵＳＥＤＩＲＯＮＣＡＴＡＬＹＳＴＦＯＲＣＯＨＹＤＲＯＧＥＮＡＴＩＯＮＴＯＨＩＧＨＥＲＡＬＣＯＨＯＬＳＳｕＹｕｎｌａｉ，ＧｕｏＹｉｑｕｎ，ＷａｎｇＷｅｎｘｉａｎｇ，ＺｈａｎｇＹｕａｎｚｈｅｎ（ＣａｔａｌｙｓｉｓＲｅｓｅａｒｃｈ...     

SYNTHESIS AND CHARACTERIZATION OF (PPh_3)_3Co(μ-CO)_2 V(CO)_2Cp AND (PPh_3)

ＳＹＮＴＨＥＳＩＳＡＮＤＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦ（ＰＰｈ_３）_３Ｃｏ（μ－ＣＯ）_２Ｖ（ＣＯ）_２ＣｐＡＮＤ（ＰＰｈ_３）ＨＰｔ（μ－ＣＯ）（μ－ＰＰｈ_２）Ｖ（ＣＯ）_２ＣｐＣｈａｎｇＰｉｎｇＳＨＡＯ（ＤａｌｉａｎＩｎｓｔｉｔｕｔｅｏｆＣｈ?..     

A NEW N－FORMYL C_（19）－DITERPENOID ALKALOID， ALDOHYPACONITINE， FROM CULTIVATED ACONITUM CARMICHAELI， DEBX．

ＡＮＥＷＮ－ＦＯＲＭＹＬＣ_（１９）－ＤＩＴＥＲＰＥＮＯＩＤＡＬＫＡＬＯＩＤ，ＡＬＤＯＨＹＰＡＣＯＮＩＴＩＮＥ，ＦＲＯＭＣＵＬＴＩＶＡＴＥＤＡＣＯＮＩＴＵＭＣＡＲＭＩＣＨＡＥＬＩ，ＤＥＢＸ．￥ＸｉａｎＫａｉＷＡＮＧ；ＴｏｎｇＦａｎｇＺＨＡＯａｎｄＳｈ?..     

STATE OF WATER SORBED ON ION EXCHANGERS

ＳＴＡＴＥＯＦＷＡＴＥＲＳＯＲＢＥＤＯＮＩＯＮＥＸＣＨＡＮＧＥＲＳＶｅｎｋａｔａｒａｍａｎｉＢ．（ＣｈｅｍｉｓｔｒｙＤｉｖｉｓｉｏｎＢｈａｂｈａＡｔｏｍｉｃＲｅｓｅａｃｈＣｅｎｔｒｅＴｏｍｂａｙ，Ｂｏｍｂａｙ４０００８５Ｉｎｄｉａ）Ａｂｓｔｒａｃｔ：...     

双模板剂法控制SAPO－34分子筛的晶粒尺寸

分别在ＮＥｔ＿３，ＴＥＡＯＨ和ＴＥＡＯＨ－ＮＥｔ＿３双模板剂存在下合成了磷酸硅铝分子筛ＳＡＰＯ－３４．考察了模板剂的组成对ＳＡＰＯ－３４的晶粒尺寸、比表面、热稳定性和对甲醇转化反应催化性能的影响。实验表明，采用ＴＥＡＯＨ－ＮＥｔ＿３双模板剂法，能有效地控制ＳＡＰＯ－３４的晶粒尺寸，以微量的ＴＥＡＯＨ与ＮＥｔ＿３为双模板剂合成的大晶粒ＳＡＰＯ－３４分子筛，对甲醇转化产物和烯烃的选择性有显著提高     

CHINESE JOURNAL OF CHEMISTRY

Ｖｏｌ.2 0　Ｎｏ .9　Ｓｅｐｔｅｍｂｅｒ 2 0 0 2ＡＵＴＨＯＲ　ＩＮＤＥＸＡＮ ,Ｌｉ Ｎａ 917…………………ＢＡＩ,Ｆｅｎｇ Ｌｉａｎ 917……………ＣＡＩ,Ｚｈｅｎｇ Ｈｏｎｇ 90 9…………ＣＨＥＮ ,Ｃｈｕａｎ Ｆｅｎｇ 917………ＣＨＥＮ ,Ｊｉｅ Ｓｈｅｎｇ 85 8…………ＣＨＥＮ ,Ｊｉ Ｆｅｎｇ 92 1……………ＣＨＥＮ ,Ｗｅｉ 85 8………………ＤＡＩ ,Ｌｉ Ｘｉｎ 816………………ＤＩＮＧ ,Ｈｏｎｇ 85 1………………ＤＵ ,Ｃｈｅｎ Ｘｉａ 86 5……………ＤＵＡＮ ,Ｊｉｎ Ｘｉａ 90 4……………ＦＡＮ ,Ｊｕｎ 90 9…………     

作者索引

ＡＡ·ＺＡＫＡＲＩＡ1 :89ＢＢＡＩＹｉｎｇ白　莹 4 :50 1ＢＡＯＹｕｅ包　烨 3:2 76ＢＩＫｅ＿ｗａｎ毕可万 2 :2 38ＣＣＴＯｕｎｇ翁继志 2 :1 95ＣＡＯＰｅｉ ｇｅｎ曹佩根 1 :6 5ＣＡＯＷｅｉ ｍｉｎ曹为民 1 :89ＣＡＯＸｉａｏ Ｗｅｉ曹晓卫 1 :54;1 :73ＣＨＡＮＧＹｉｎ ｃｈｉｅ张英杰 3:332ＣＨＡＯＨｕｉ巢　晖 2 :1 6 7ＣＨＥＮＤｏｎｇ ｍｉｎｇ陈东明 1 :6 2ＣＨＥＮＧｕａｎｇ＿ｚｈａｎｇ陈光章 3:372ＣＨＥＮＧｕｏ ｌｉａｎｇ陈国良 4 :4 52 ;1 :96ＣＨＥＮＨｏｎｇ＿ｊｕｎ陈红军 3:31 0ＣＨＥＮＬｉ＿ｋａｎｇ陈利康 2 …     

RECOVERY OF EUROPIUM FROM CROWN ETHER COMPLEX SOLUTIONS BY THE ELECTROCHEMICAL METHOD

ＲＥＣＯＶＥＲＹＯＦＥＵＲＯＰＩＵＭＦＲＯＭＣＲＯＷＮＥＴＨＥＲＣＯＭＰＬＥＸＳＯＬＵＴＩＯＮＳＢＹＴＨＥＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＭＥＴＨＯＤ￥ＦａｎＱｉＫＯＮＧ；ＺｈａｎｇＹｕＹＵ；ＫｅＱｉａｎｇＧＵ；ＸｉｎｇＨｕＸＵ；ＭｅｉＱＩＮａｎｄＳｈ...     

作者索引

ＡＡＮＴａｉ＿ｃｈｅｎｇ安太成 3:32 7ＣＣＡＩＳｈｅｎｇ＿ｍｉｎ蔡生民 1 :8;1 :9;1 :2 7ＣＡＯＧｕａｎｇ＿ｙｉ曹广益 4:46 3ＣＡＯＷｅｉ＿ｍｉｎ曹为民 2 :2 2 8ＣＨＡＮＧＳｈｏｕ＿ｗｅｎ常守文 3:2 57ＣＨＡＮＧＴｉａｎ＿ｙｉ常天义 3:34 3ＣＨＥＮＦａｎ＿ｃａｉ陈范才 3:2 95ＣＨＥＮＦｅｉ陈　菲 3:2 88ＣＨＥＮＧｕａｎｇ＿ｚｈａｎｇ陈光章 1 :6 6 ;2 :1 72 ;4:439ＣＨＥＮＨｕｉ陈　惠 1 :54ＣＨＥＮＬｉ＿ｋａｎｇ陈利康 1 :1 0 5ＣＨＥＮＭａｏ＿ｈｕｉ陈茂惠 4:381ＣＨＥＮＲｏｎｇ陈　蓉 3:32 1ＣＨＥＮＷｅｉ陈　伟 …     

巯基树脂对重金属离子的吸附性能

研究了自合成的巯基树脂对重金属离子Pb^2 、Cu^2 、Cd^2 ．Ni^2 、Co^2 的吸附容量、吸附动力学、等温吸附过程等静态吸附性能，同时研究了影响吸附的因素和吸附机理．结果表明，该树脂对软酸型重金属离子吸附容量高．pH=5．0-5．7，低温有利于吸附，树脂对各重金属离子等温吸附在实验浓度范围内均符合Langmuir和Freundnch方程．吸附机理研究表明，巯基与重金属离子发生了离子交换和配位反应，化学吸附起支配作用。     

Effect of operating conditions on the removal of Pb2+ by microporous titanosilicate ETS-10 in a fixed-bed column

The breakthrough behavior of Pb2+ in an ETS-10 fixed bed was experimentally examined at various operating conditions. Results showed that the adsorption amount of Pb2+ ions per unit mass of ETS-10 particles in a column is about 1.68 mmol/g under the experimental conditions. This amount was not markedly affected by the operating conditions because of the rapid adsorption rate of Pb2+ ions on ETS-10. In the presence of competitive metal ions, the amount of Pb2+ adsorbed on ETS-10 was slightly reduced. An overshoot of the effluent concentrations of competitive metal ions Cu2+ and Cd2+ was observed in the adsorption systems of binary and ternary solutions. This is ascribed to the replacement of pre-adsorbed Cu2+ and Cd2+ ions by Pb2+ ions. The ETS-10 column broken up by Pb2+ ions can be regenerated by using an EDTA-Na2 solution and the regenerated column can be reused.     

CMC-Na/DETA-B62型蛇笼树脂对金属离子的吸附性能

本文研究了自合成的蛇笼型螯合树脂-二乙烯三胺交联甘油环氧树脂/羰甲基纤维素体系对Cd^2 ,Pb^2 ,Fe^2 的吸附量，吸附动力学，等温吸附过程等静态吸附性能，同时研究了pH值等因素对吸附性能的影响。实验结果表明，该树脂对Cd^2 具有较强的吸附选择性，能在Cd^2 ,Pb^2 ,Fe^2 3种离子共存时选择吸附Cd^2 ，其选择性系数分别为Kcd^2 /pb^2 =3.77,Kcd^2 /Fe^2 =9.61。该树脂对上述3种离子的吸附量可分别达4.00,1.06,0.42mmol/g。该类树脂可用于含重金属离子污水的处理和金属离子的分离等方面。     

在多孔有机聚合物中构筑广谱性重金属离子吸附活性位

以三维刚性结构的三蝶烯为单体, 通过简单的Friedel-Crafts烷基化反应制备得到高比表面积的三蝶烯基多孔有机聚合物(TPOP), 在TPOP中接枝乙二胺和氯乙酸钠, 构建了广谱重金属离子吸附剂(TPOP-CH₂EDTA). 获得的TPOP-CH₂EDTA具有微孔/介孔结构, 其微孔尺寸为1.6 nm, BET比表面积为634 m²/g, 利于重金属离子传递和配位作用的强化. TPOP-CH₂EDTA对重金属离子具有吸附广谱性, 其对Ag(Ⅰ), Cu(Ⅱ), Ni(Ⅱ), Zn(Ⅱ), Co(Ⅱ), Sn(Ⅳ), Pb(Ⅱ), Cd(Ⅱ), Fe(Ⅲ)和Cr(Ⅲ)等10种重金属离子的去除率均高于98%. 以Pb(Ⅱ)为典型的重金属污染物, 通过Langmuir模型计算得到Pb(Ⅱ)的最大吸附容量高达184.5 mg/g; 具有拟二级吸附动力学特征, 吸附速率快, 动力学常数k₂为0.0173 g·mg^?1·min^?1; 经过5次循环使用后, Pb(Ⅱ)的去除效率仍高达95.8%. TPOP-CH₂EDTA对混合溶液中Pb(Ⅱ)和Cu(Ⅱ)的去除率均高于99%, 且对含有大量无机盐[如Ca(Ⅱ), Mg(Ⅱ), K(Ⅰ)和Na(Ⅰ)离子]和有机化合物的复杂真实水体系, Pb(Ⅱ)和Cu(Ⅱ)的去除效率仍高于90%. 因此, 通过调控多孔有机聚合物微观结构(如比表面积、 孔径和吸附位点密度)而构筑的广谱性重金属吸附材料, 为协同去除复杂水系统中混合重金属离子提供了方案.     

Adsorption of some bivalent heavy metal ions from aqueous solutions by manganese nodule leached residues

The leached residue, generated after selective extraction of Cu, Ni, and Co in sulfur dioxide-ammonia leaching of manganese nodules, was characterized and batch isothermal adsorption experiments were conducted at ambient temperature to evaluate the effectiveness of the water-washed leached residue for removal of different bivalent metal ions from aqueous synthetic solutions. The effects of pH, initial metal ion concentrations, amount of adsorbent, interfering ions, and heat treatment were also investigated. The uptake of metal ions increased with increasing pH. Under identical conditions the adsorption capacity increased in the order Cd(2+)相似文献   

介孔α-Fe2O3表面配合反应平衡常数测定

采用十二胺为模板剂、氨水做沉淀剂成功制备了介孔α-Fe2O3,通过粉末X射线衍射(XRD)、透射电镜(TEM)、N2吸附/脱附技术对样品晶相、形貌和比表面积进行了表征.根据介孔α-Fe2O3悬浮液的酸碱滴定数据,使用FITEQL软件,采用双电层恒电容模型计算得出了介孔α-Fe2O3的表面酸碱反应平衡常数.在此基础上研究了Cu2+,Pb2+,Zn2+在介孔氧化铁表面的吸附行为,使用WinSGW软件模拟得出了相应的表面配合反应平衡常数并讨论了其吸附机理.     

Kinetic parameters of urease immobilized on modified acrylonitrile copolymer membranes in the presence and absence of Cu(II) ions

Poly(acrylonitrile-methylmethacrylate-sodium vinylsulfonate) membranes were subjected to seven different chemical modifications and the amount of the newly formed groups was measured for each membrane. Urease was then covalently immobilized onto the modified membranes and the amount of bound protein was determined. The kinetic parameters V(max) and K(m) of the immobilized urease were studied under static and dynamic conditions. Results showed that the rate of the enzyme reaction was higher for the membranes modified with NH(2)OH . H(2)SO(4), NH(2)NH(2) . H(2)SO(4), NaOH + EDA and NaOH + GA + EDA. It was confirmed that the reaction rate, measured under dynamic conditions, was higher than that one determined under static conditions. The influence of Cu(II) ions, as inhibitors, on the enzyme reaction kinetics (V(i) and K(i)) was also investigated. It turned out that the most sensitive membranes towards Cu(II) were those modified with NH(2)NH(2) . H(2)SO(4), NaOH + EDA and H(2)O(2). The results initiated further investigations on the influence of other heavy metal ions (Cd(II), Zn(II), Ni(II) and Pb(II)) over urease bound to a NH(2)OH . H(2)SO(4)-modified membrane. It was found that the inhibition effect of the heavy metal ions over immobilized urease decreases in the order: Cu(II) > Cd(II) > Zn(II) > Ni(II) > Pb(II). [Diagram: see text]     

THE THEORETICAL STUDY OF ADSORPTION OF METAL IONS ON CHITOSAN

The interactions between metal ions such as Zn2+, Pb2+, Mn2+, Hg2+, Cd2+, Ni2+ and chitosan have been investigated using the model cluster model method and density functional method. Full optimization and frequency analysis of all cluster models have been performed employing B3LYP hybrid method at 3-21G basis set level except metal ions which were invoked to use effective core potential (ECP) method. The energy changes, and the main structural parameters have been obtained during the theoretical study of the adsorption of metal ions on the chitosan. The calculations showed that the coordination modes of metal ions with chitosan models were different, the geometries of Mn2+, Zn2+, Cd2+, Hg2+, Pb2+ ions coordinated with two nitrogen atoms and two oxygen atoms were distorted tetrahedral, while the square planar structure of Ni2+ coordinated two nitrogen atoms and two oxygen atoms was observed. The heat of reaction between six metal ions and chitosan models showed the order: Mn2+ ＞Ni2+ ＞Zn2+ ＞Pb2+ ＞Hg2+ ＞Cd2+, this suggested that the coordination strength of Mn2+ ＞Ni2+ ＞Zn2+ ＞Pb2+ ＞Hg2+ ＞Cd2+.     

大孔型腐植酸树脂的合成及其对重金属离子的螯合性

交联的聚苯乙烯(PS)通过偶氮键—N=N—或酯、醚键与腐植酸(HA)相连接枝得珠状大孔型腐植酸树脂(HAR)。当HA/PSNH_2的重量比为0.7—1.0,PSN_2~+Cl~-偶联PH13时制得的偶氮型腐植酸树脂(AHAR)对重金属离子有优良的吸附性。延长PSCH_2Cl与HA的反应时间可提高酯醚型腐植酸树脂(EHAR)对Cu~(2+)的吸附量。红外光谱探讨了HAR的结构。AHAR的吸附容量为1.01mmol~(2+)Cd/g树脂,对Ni~(2+)、Mn~(2+)、Cu~(2+)、Co~(3+)、Zn~(2+)为0.6—0.53mmol离子/g树脂。重金属离子在AHAR上的分配系数为 Cu~(2+)(8.7×10~3)>Cd~(2+)(3.8×10~2)>Zn~(2+)(2.4×10~2)>Ni~(2+)(1.8×10~2)>Mn~(2+)(4.9×10)。 pH6.5时AHAR能定量吸附Cu~(2+)、Cd~(2+)、Ni~(2+)、Mn~(2+),并能用INHNO_3定量洗脱。AHAR可再生,重复使用,分析了四种天然水、自来水中痕量上述金属离子的浓度。     

Effects of heavy metals and oxalate on the zeta potential of magnetite

Zeta potential is a function of surface coverage by charged species at a given pH, and it is theoretically determined by the activity of the species in solution. The zeta potentials of particles occurring in soils, such as clay and iron oxide minerals, directly affect the efficiency of the electrokinetic soil remediation. In this study, zeta potential of natural magnetite was studied by conducting electrophoretic mobility measurements in single and binary solution systems. It was shown that adsorption of charged species of Co(2+), Ni(2+), Cu(2+), Zn(2+), Pb(2+), and Cd(2+) and precipitation of their hydroxides at the mineral surface are dominant processes in the charging of the surface in high alkaline suspensions. Taking Pb(2+) as an example, three different mechanisms were proposed for its effect on the surface charge: if pH<5, competitive adsorption with H(3)O(+); if 56, precipitation of heavy metal hydroxides prevails. Oxalate anion changed the associated surface charge by neutralizing surface positive charges by complexing with iron at the surface, and ultimately reversed the surface to a negative zeta potential. Therefore the adsorption ability of heavy metal ions ultimately changed in the presence of oxalate ion. The changes in the zeta potentials of the magnetite suspensions with solution pH before and after adsorption were utilized to estimate the adsorption ability of heavy metal ions. The mechanisms for heavy metals and oxalate adsorption on magnetite were discussed in the view of the experimental results and published data.