纤维互基磁性聚偕胺肟树脂的研究

研究了纤维素基磁性聚偕胺肟树脂吸附氯铂酸的过程。接触２５ｍｉｎ时，吸附容量达２１７ｍｇＰｔ／ｇ℃Ｒ。吸附速度受控于粒内扩散和化学反应。在Ｈ２ＰｔＣｌ６溶液中添加酸或碱均使吸附容量急剧下降。     

纤维素基磁性聚偕胺肟树脂的研究：树脂对氯钯酸的吸附行为

H2PdCl4在纤维素基磁性聚偕胺肟树脂上的吸附是一个复杂的过程。在生成AO－H2pDcL4络合物时伴随着外加酸的竞争吸附、物理吸附和氧化还原作用等副反应。物理扩散和化学吸附均非吸附速度的控制阶段，表现为快的吸附速度，接触5分钟时，讨论了吸附机理。     

纤维素基磁性聚偕胺肟树脂吸附锂

研究了氯化锂浓度、树脂含量和溶液的ＰＨ对碱式纤维素基磁性聚偕胺肟树脂吸附Ｌｉ＾＋离子能力的影响。在适当条件下，每个偕胺肟基可吸附两个Ｌｉ＾＋离子。     

纤维素基磁性聚偕胺肟树脂的研究──(NH_4)_2IrCl_6在树脂上的吸附

碱式纤维素基磁性聚偕胺肟树脂（ＢＭＡＯ）吸附（ＮＨ４）２ＩｒＣｌ６是快速过程，属超当量吸附。吸附结果生成ＡＯ－Ｉｒ和ＡＯ２－Ｉｒ３络合物，随后Ｉｒ（Ⅳ）被偕胺肟基还原为Ｉｒ（０），聚集成球状晶簇附着在树脂表面。     

纤维素基磁性聚偕胺肟树脂研究：HAuCl4在树脂上的吸附与还原

研究了ＨＡｕＣｌ４在碱式纤维素基磁性聚偕胺肟树脂上的吸附动力学。吸附容量与吸附时间关系在初吸附的３０ｍｉｎ内可表示为Ｑ＝０．６４ｔ＾０．４。粒内扩散是吸附速度的控制阶段。在吸附过程中，同时发生氧化还原反应，Ａｕ（０）以不同聚集态附着在树脂表面。     

锂在纤维素基磁性聚偕胺肟载锰树脂上的吸附

研究了Li+在纤维素基磁性聚偕胺肟载锰树脂（MMAO）上的吸附行为。实验结果表明，每一吸附中心与两个Li+离子结合．吸附容置随LiCl浓度和吸附中心密度的增大相应增大．在合适条件下，吸附容量达58gLi／kgMnO2。     

纤维素基磁性聚偕胺肟树脂的研究：硝酸银在碱式树脂上的吸附

研究了碱式纤维素基磁性聚偕胺肟树脂（BMAO）吸附AgNO3的行为。树脂与AgNO3溶液接触10分钟，Qt／Q∞＝0．93）接近饱和吸附。增大AgNO3浓度或液－固比，吸附容量增幅甚小，但AgNO3浓度的变化对浓集因数的影响十分显著，这一特性有利于树脂从稀溶液中回收银。扫描电镜照片显示出树脂表面上吸着大量银的微粒，表明吸附时Ag（Ⅰ）被还原为Ag（0），则氧化成羧基，进一步吸附Ag 离子。     

纤维素基磁性聚偕胺肟树脂的研究：—PdCl2在树脂上的吸附动力学

ＰｄＣｌ２在碱式纤维素基磁性聚偕胺肟树脂上的吸附行为与Ｈ２ＰｄＣｌ４不同，主要表现在高的超当量吸附。动力学研究表明，Ｈ２ＰｄＣｌ４在碱中和过程中逐步转变为Ｎａ２ＰｄＣｌ４、ＰｄＣｌ２、和［Ｐｄ（ＯＨ）２Ｃｌ２］２，它们被树脂吸附时首先形成ＡＯ－Ｐｄ２和ＡＯ２－Ｐｄ３络合物，随后被还原为单质钯，汇聚成微粒吸着在树脂表面。     

纤维素基磁性聚偕胺肟树脂的研究——循环吸溴中吸附与还原能力的变化

研究了酸式纤维素基磁性聚偕胺肟树脂（ＡＭＡＯ）在循环吸溴过程中吸附容量和还原能力的变化，发现原树脂的吸溴初速和溴的还原率比再生树脂高一倍以上，但第一次和第二次再生树脂的吸附速度和还原效率几乎相同，暗示着树脂吸溴后基本结构已发生了彻底的变化．树脂在循环使用时吸溴容量变化不大而溴的还原量却显著降低，表明ＡＭＡＯ作为吸溴剂有较高的实用价值．     

纤维素基磁性聚偕氨肟树脂吸附Mn（Ⅶ）

用酸处理的纤维素基磁性聚偕氨肟树脂（AMAO）在溶液中吸附KMnO4，发生氧化还原反应的几率在2％以下；用碱处理的树脂（BMAO）作吸附剂，KMnO4还原为Mn（OH）4的比例剧增，达到或超过10％，并且与溶液的pH有关。但是，Mn（Ⅶ）被还原为Mn（Ⅳ）的量基本上不受KMnO4起始浓度、吸附剂添加量和吸附时间变化的影响。BMAO树脂吸附KMnO4的量是树脂偕氨肟基含量的5倍以上。超当量吸附现象反映了物理吸附的本质。     

纤维素基磁性聚偕胺肟树脂的研究——溴在树脂上的氧化还原反应

用羟胺作模拟物与溴反应，测定了吸溴前后的酸式纤维素基磁性聚偕胺肟树脂的红外光谱，结合Ｆｒｅｕｎｄｌｉｃｈ及Ｌａｎｇｍｕｉｒ等温吸附方程的分析和吸溴前后树脂重量变化的测定，证明纤维素基磁性聚偕胺肟树脂吸溴后随即发生氧化还原反应，偕胺肟基被氧化为羧基，溴则被还原为溴离子，在溴浓度较高时，纤维素葡萄糖单元上的羟基被溴代或被氧化成羰酸，若葡萄糖苷键氧化断裂，将导致大分子降解。     

笼形聚偕胺肟树脂的研究贵金属在RCO2H／ACAO树脂上的交换吸附

用羧酸处理的笼形聚偕胺肟树脂（ＲＣＯ２Ｈ／ＡＣＡＯ）吸附Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）、Ｐｔ（Ⅳ）、Ａｇ（Ⅰ）、Ａｕ（Ⅲ）离子的能力与羧酸性质有关，巯其乙酸／ＡＣＡＯ树脂对Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）和Ａｕ（Ⅲ）吸附容量较高，乙二酸／ＡＣＡＯ树脂则对Ａｇ（Ⅰ）和Ｐｔ（Ⅳ）离子有稍强的吸附能力。除Ｐｄ（Ⅱ）外，ＲＣＯ２Ｈ／ＡＣＡＯ树脂吸附贵金属离子的能力低于笼形聚偕胺肟树脂（ＣＡＯ）和碱处理笼形聚偕胺肟树脂（ＢＣ     

Humic Acid Removal by Combining the Magnetic Property of Maghemite with the Adsorption Property of Nanosized Hydroxyapatite

Maghemite incorporated hydroxyapatite (HAP) nanocomposite was prepared by in situ precipitation of the calcium phosphate phase in an iron oxide colloidal suspension. The resultant nanocomposite was characterized by x-ray diffraction, Fourier transform infrared spectrometer, transmission electron microscope, N₂ adsorption analysis, and vibrating sample magnetometry. The potential of HAP/γ-Fe₂O₃ nanocomposite for HA adsorption from aqueous solution was evaluated by batch experiments and adsorption kinetic tests. HA adsorption amount on the adsorbent decreased with increasing solution pH and the presence of KNO₃ and alkali-earth metal ions resulted in enhanced HA adsorption. HA adsorption onto HAP/γ-Fe₂O₃ nanocomposite could be well described by Freundlich and Sips models, while HA adsorption process on the adsorbent obeyed pseudo-second-order kinetics and the adsorption rates decreased with increasing initial HA concentration. This study showed that the HAP/γ-Fe₂O₃ nanocomposite could be used as an efficient and magnetically separable adsorbent for the removal of HA from aqueous solution. Subsequent studies demonstrated that the HA-loaded HAP/γ-Fe₂O₃ nanocomposite could be further applied for the highly efficient adsorption of methylene blue (MB) and separated from the medium by a simple magnetic process.     

大孔吸附剂对洋地黄强心甙吸附性能的研究

从７种大孔吸附树脂中筛选出ＨＡ－２型和ＨＡ－３型２种吸附剂，考察它们对洋地黄强心甙－地高辛具有较好的吸附性能。测定了该２种大孔吸附剂的比表面积、孔容及平均孔径，讨论了地高辛溶液的浓度、ｐＨ值等条件对吸附容量和吸附率的影响。     

Trichloroacetic Acid Removal by a Reductive Spherical Cellulose Adsorbent

A novel spherical cellulose adsorbent with amide and sulphinate groups was used for a first reduction of trichloroacetic acid(TCAA) and a subsequent adsorption of generated species, haloacetic acids. The removal mechanism involved TCAA reduction by sulphinate groups and the adsorption of the haloacetic acids through electrostatic interaction with amide group. Investigation of product formation and subsequent disappearance reveals that the reduction reactions proceed via sequential hydrogenolysis, and transform to acetate ultimately. Adsorption of haloacetic acids was ascertained by low chloride mass balances(89.3%) and carbon mass balances(75.1%) in solution. The pseudo-first-order rate constant for TCAA degradation was (0.93±0.12) h^-1. Batch experiments were conducted to investigate the effect of pH value on the reduction and adsorption process. The results show that the reduction of TCAA by sulphinate groups requires higher pH values while the electrostatic attraction of haloacetic acids by amino group is favorable in more acidic media.     

Binding and Sulfonation of Poly(acrylic acid) on Iron Oxide Nanoparticles: a Novel,Magnetic, Strong Acid Cation Nano‐Adsorbent

Summary: A novel, magnetic, strong acid cation nano‐adsorbent has been developed by the covalent binding of poly(acrylic acid) on the surface of Fe₃O₄ nanoparticles followed by sulfonation using sulfanilic acid via carbodiimide activation. The nano‐absorbent can be easily recovered or manipulated with an external magnetic field and shows a good capacity for the rapid and efficient adsorption of multivalent metal cations from aqueous solutions.

An illustration for the binding and sulfonation of PAA on Fe₃O₄ nanoparticles to produce a magnetic, strong acid cation nano‐adsorbent.