期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Chemically Modified Chitosan Beads as Molecularly Imprinted Polymer Matrix for Adsorptive Separation of Proteins 被引量:1
1
作者 TianYingGUO YongQingXIA GuangJieHAO BangHuaZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第11期1339-1341,共3页
In a phosphate buffer, a hemoglobin (Hb)-imprinted polymer complex was prepared using maleic anhydride (MAH) modified chitosan beads as matrix, acrylamide (AM) as functional monomer, N,N-methylenebisacrylamide (MBA) a... In a phosphate buffer, a hemoglobin (Hb)-imprinted polymer complex was prepared using maleic anhydride (MAH) modified chitosan beads as matrix, acrylamide (AM) as functional monomer, N,N-methylenebisacrylamide (MBA) as cross-linker and potassiumpersulfate (KPS) / sodium hydrogen sulfite (NaHSO3) as initiators. Langmuir analysis showed that an equal class of adsorption was formed in the molecular imprinting polymer (MIP), and the MIP has high adsorption capacity and selectivity for the imprinted molecule. The MIP can be reused and the recovery was approximately 100% at low concentration. 展开更多
关键词 Chemically modified chitosan beads POLYACRYLAMIDE protein imprinting.
下载PDF
Selective adsorption behavior of ion-imprinted magnetic chitosan beads for removal of Cu(Ⅱ) ions from aqueous solution
2
作者 Licheng Ma Qi Zheng 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第11期103-111,共9页
Heavy metal ion is one of the major environmental pollutants.In this study,a Cu(Ⅱ)ions imprinted magnetic chitosan beads are prepared to use chitosan as functional monomer,Cu(Ⅱ)ions as template,Fe_(3)O_(4) as magnet... Heavy metal ion is one of the major environmental pollutants.In this study,a Cu(Ⅱ)ions imprinted magnetic chitosan beads are prepared to use chitosan as functional monomer,Cu(Ⅱ)ions as template,Fe_(3)O_(4) as magnetic core and epichlorohydrin and glutaraldehyde as crosslinker,which can be used for removal Cu(Ⅱ)ions from wastewater.The kinetic study shows that the adsorption process follows the pseudosecond-order kinetic equations.The adsorption isotherm study shows that the Langmuir isotherm equation best fits for the monolayer adsorption processes.The selective adsorption properties are performed in Cu(Ⅱ)/Zn(Ⅱ),Cu(Ⅱ)/Ni(Ⅱ),and Cu(Ⅱ)/Co(Ⅱ)binary systems.The results shows that the ⅡMCD has a high selectivity for Cu(Ⅱ)ions in binary systems.The mechanism of ⅡMCD recognition Cu(Ⅱ)ions is also discussed.The results show that the ⅡMCD adsorption Cu(Ⅱ)ions is an enthalpy controlled process.The absolute value of DH(Cu(Ⅱ))and DS(Cu(Ⅱ))is greater than DH(Zn(Ⅱ),Ni(Ⅱ),Co(Ⅱ))and DS(Zn(Ⅱ),Ni(Ⅱ),Co(Ⅱ)),respectively,this indicates that the Cu(Ⅱ)ions have a good spatial matching with imprinted holes on ⅡMCD.The FTIR and XPS also demonstrates the strongly combination of function groups on imprinted holes in the suitable space position.Finally,the ⅡMCD can be regenerated and reused for 10 times without a significantly decreasing in adsorption capacity.This information can be used for further application in the selective removal of Cu(Ⅱ)ions from industrial wastewater. 展开更多
关键词 Ion imprinted techniques Selective recognition Ion-imprinted magnetic chitosan beads KINETIC THERMODYNAMICS
下载PDF
Adsorption of Cr(III) from an Aqueous Solution by Chitosan Beads Modified with Sodium Dodecyl Sulfate (SDS)
3
作者 Munkhpurev Bat-Amgalan Zoltuya Khashbaatar +5 位作者 David Eva Vanessa Anak Muhammad Nabil Md Sari Naoto Miyamoto Naoki Kano Hee-Joon Kim Ganchimeg Yunden 《Journal of Environmental Protection》 2021年第11期939-960,共22页
This study is to prepare chitosan beads modified with sodium dodecyl sulfate (SDS) to effectively remove Cr(III) from an aqueous solution. The characterizations of SDS-chitosan by scanning electron microscopy-energy d... This study is to prepare chitosan beads modified with sodium dodecyl sulfate (SDS) to effectively remove Cr(III) from an aqueous solution. The characterizations of SDS-chitosan by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) proved the successful synthesis of the adsorbent. The adsorption of Cr(III) on the SDS material was investigated by varying experimental conditions such as pH, contact time and adsorbent dosage. The maximum adsorption capacity of SDS-chitosan for Cr(III) was estimated to be 3.42 mg?g<sup>-1</sup>. The results of adsorption kinetics and isothermal models show that the adsorption process conforms to the pseudo-second-order and Langmuir isotherm models, indicating that the adsorption is single-layer chemical adsorption. Thermodynamic analyses indicate that the adsorption of Cr(III) is an endothermic reaction. These results show that the new adsorbent has obvious application prospect to eliminate Cr(III). 展开更多
关键词 chitosan beads Sodium Dodecyl Sulfate (SDS) Trivalent Chromium Ions (Cr(III)) ADSORPTION Adsorption Isotherms Adsorption Kinetics
下载PDF
La(Ⅲ)-loaded bentonite/chitosan beads for defluoridation from aqueous solution 被引量:1
4
作者 张艺 徐莹 +4 位作者 崔昊 刘炳杰 高翔 汪东风 梁鹏 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第5期458-466,共9页
Developing low-cost and effective materials for excess fluoride removal is important for providing safe water. A novel ad- sorbent, La(IlI)-loaded bentonite/chitosan beads (La-BCB) was prepared for defluoridation ... Developing low-cost and effective materials for excess fluoride removal is important for providing safe water. A novel ad- sorbent, La(IlI)-loaded bentonite/chitosan beads (La-BCB) was prepared for defluoridation from aqueous solution. The effects of various parameters such as dosage of La(III), pH, temperature, contact time, initial fluoride concentration and presence of co-existing anions were investigated to examine the defluoridation behavior. The maximum defluoridation capacity of La-BCB was 2.87 mg/g at pH 5, 30 ℃. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and Fourier transform infrared spectros- copy (FTIR) were employed to analyze the characteristics of La-BCB. The equilibrium fluoride adsorption data fitted well with both Langmuir and Freundlich isotherm models. The RL value revealed that the defluoridation process using La-BCB was favorable. The adsorption kinetics followed pseudo-second order kinetic as well as particle and intraparticle diffusion models. The presence of car- bonate and bicarbonate reduced defluoridation capacity of La-BCB while sulphate, nitrate and chloride showed slight effect. The ex- hausted La-BCB was regenerated using sodium hydroxide with only 17% loss. The reasonable defluoridation mechanism could be interpreted as adsorption and ion exchange. 展开更多
关键词 La(III) BENTONITE chitosan beads DEFLUORIDATION adsorption FLUORIDE rare earths
原文传递
Pb(Ⅱ) biosorption using chitosan and chitosan derivatives beads: Equilibrium, ion exchange and mechanism studies 被引量:20
5
作者 W. S. Wan Ngah S. Fatinathan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2010年第3期338-346,共9页
The study examined the adsorption of Pb(II) ions from aqueous solution onto chitosan, chitosan-GLA and chitosan-alginate beads. Several important parameters influencing the adsorption of Pb(II) ions such as initia... The study examined the adsorption of Pb(II) ions from aqueous solution onto chitosan, chitosan-GLA and chitosan-alginate beads. Several important parameters influencing the adsorption of Pb(II) ions such as initial pH, adsorbent dosage and different initial concentration of Pb(II) ions were evaluated. The mechanism involved during the adsorption process was explored based on ion exchange study and using spectroscopic techniques. The adsorption capacities obtained based on non–linear Langmuir isotherm for chitosan, chitosan-GLA and chitosan-alginate beads in single metal system were 34.98, 14.24 and 60.27 mg/g, respectively. However, the adsorption capacity of Pb(II) ions were reduced in the binary metal system due to the competitive adsorption between Pb(II) and Cu(II) ions. Based on the ion exchange study, the release of Ca2+, Mg2+, K+ and Na+ ions played an important role in the adsorption of Pb(II) ions by all three adsorbents but only at lower concentrations of Pb(II) ions. Infrared spectra showed that the binding between Pb(II) ions and the adsorbents involved mostly the nitrogen and oxygen atoms. All three adsorbents showed satisfactory adsorption capacities and can be considered as an efficient adsorbent for the removal of Pb(II) ions from aqueous solutions. 展开更多
关键词 chitosan and chitosan derivatives beads ion exchange MECHANISM
下载PDF
Preparation and Characterization of AlginateHyaluronic Acid-chitosan based Composite Gel Beads
6
作者 胡燕 ZHENG Mengzhu +3 位作者 DONG Xiaoying ZHAO Dan 程寒 XIAO Xincai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1297-1303,共7页
The aim of this study was to fabricate composite gel beads based on natural polysaccharides. Hyaluronic acid(HA) and Chitosan(CS) were successfully admixed with Ca^2+/alginate(SA) gel system to produce SA/HA/CS... The aim of this study was to fabricate composite gel beads based on natural polysaccharides. Hyaluronic acid(HA) and Chitosan(CS) were successfully admixed with Ca^2+/alginate(SA) gel system to produce SA/HA/CS gel beads by dual crosslinking: the ionic gelation and the polyelectrolyte complexation. The preparation procedure was that the weight ratio of SA(2%, m/v) to HA(2%, m/v) was kept at 2:1, then the mixture was dripped into the Ca^2+ solution for ion-crosslinking, and finally polyelectrolyte crosslinked with 2% low molecular weight CS(LMW-CS) for 1.5 hours. The optimal formulation was achieved by adjusting the concentration and the weight ratio of SA, HA and LMW-CS. Due to the incorporation of HA and LMWCS, the swelling ratio of the beads at pH 7.4 was increased up to 120, and the time for the maximum swelling degree was prolonged to 7.5 h. The swelling behavior was obviously improved compared to the pure SA/Ca^2+ system. The preliminary results clearly suggest that the SA/HA/CS gel beads may be a potential candidate for biomedical delivery vehicles. 展开更多
关键词 gel beads hyaluronic acid low molecular weight chitosan alginate
下载PDF
A Modified Chitosan Adsorbent for Selective Removal of Low Density Lipoprotein 被引量:3
7
作者 GuoQiFU KeYuSHI +5 位作者 ZhiYUAN WenQiangNIU BingLinHE BinLIU BinSHEN YanLIU 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第3期347-349,共3页
A modified chitosan adsorbent was synthesized through a simple preparation procedure, and it demonstrated good adsorption performance for selective removal of low density lipoprotein in human plasma. Phase inversion ... A modified chitosan adsorbent was synthesized through a simple preparation procedure, and it demonstrated good adsorption performance for selective removal of low density lipoprotein in human plasma. Phase inversion technique was employed to form chitosan beads, to which epoxy groups were then introduced by reacting with ethyleneglycol diglycidylether, and tryptophan was subsequently coupled to the epoxy-activated beads. 展开更多
关键词 chitosan bead low density lipoprotein CHOLESTEROL ADSORPTION tryptophan.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部