グラスルーツグローバリゼーション －草の根・地域からの人類一体化の推進－

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Kinetics and equilibrium adsorption of copper(II) and nickel(II) ions from

使用乙二胺改性的木屑黄原酸盐对水溶液中的Cu(II)、Ni(II)离子进行吸附。在单离子体系中,考虑影响因素(温度、投加量)对Cu(II)、Ni(II)单离子吸附等温线的影响;并计算Cu(II)、Ni(II)离子吸附的热力学参数:吸附吉布斯自由能(?GΘ)、吸附过程的焓变(?HΘ)以及熵变(?SΘ),表明此吸附是一个放热自发的过程。在Cu(II)和Ni(II)双离子体系中,采用修正后的拓展Langmuir模型对体系的吸附情况可以进行很好的预测。在单离子体系和双离子体系中,吸附过程的数据均可通过准二级动力学模型进行描述;计算得到其对Cu(II)和Ni(II)单离子的吸附活化能分别为59.12和55.92 kJ/mol。结果表明,金属离子在改性木屑表面的吸附效果会受到另一离子存在的影响。Abstract: Sawdust xanthate modified with ethanediamine was used for the removal of Cu(II) and Ni(II) from aqueous solution. The influence of various operating parameters such temperature and adsorbent dosage on the adsorption isotherms of modified sawdust was investigated. Thermodynamic parameters, namely Gibbs free energy (ΔGΘ), enthalpy (ΔHΘ) and entropy (ΔSΘ) of Cu(II) and Ni(II) adsorption process were calculated, showing that the adsorption is a spontaneous and exothermic process. The modified extended Langmuir equation approaches provide excellent prediction of the binary adsorption. In single and binary systems, the overall adsorption data were best described by the pseudo-second order kinetic model, then the calculated values of activation energy of Cu(II) and Ni(II) adsorption process were 59.12 and 55.92 kJ/mol respectively. The results show that the affinity of each metal ion onto the modified sawdust surface is influenced by the presence of the other one.Project(41061044)supported by the National Natural Science Foundation of China;Projects(2010GXNSFD013016,2012GXNSFAA053017)supported by the Natural Science Foundation of Guangxi,Chin

Kinetic and Equilibrium Adsorption of Cu~（2＋）,Ni~（2＋） and Cd~（2＋） Ions on Chelating Sawdust Xanthate

采用丙烯酸甲酯、乙二胺对碱化木屑进行接枝反应,然后用二硫化碳黄化,合成了具有酰胺基和氨基的木屑黄原酸盐;并研究了其对重金属离子Cu2+、Ni2+和Cd2+的吸附行为。结果表明,螯合木屑黄原酸盐对Cu2+、Ni2+和Cd2+的平衡吸附量次序为:Cd2+>Cu2+>Ni2+,其值分别是32.873 mg/g、17.328 mg/g和32.982 mg/g。等温吸附过程符合Langmuir方程,说明吸附可能属于单分子层吸附;动力学吸附过程符合准二级动力学模型,吸附过程可能属于化学吸附反应。The containing acylamino and amino chelating sawdust xanthate synthesized by the grafting reaction of sawdust,methyl acrylate,epichlorohydrin and carbon disulfide was used to investigate the adsorptions of Cu2＋,Ni2＋ and Cd2＋ ions.The results showed that the order of the equilibrium adsorption capacity for three metal ions was as follows： Cd2＋ Cu2＋ Ni2＋,the value was calculated to be 32.873 mg/g,17.328 mg/g and 32.982 mg/g respectively.The Langmuir isotherm model could explain the isotherm data,and indicated the process was possible monolayer adsorption.The pseudo second-order rate equation could explain the kinetic experimental data,this suggested the adsorption process is possible chemical adsorption reaction.国家自然科学基金项目(41061044);广西自然科学基金重点项目(2010GXNSFD013016);广西自然科学基金面上项目(2012GXNSFAA053017)资

Visible photocatalytic degradation of wastewater from eosin Y solution using nitrogen-doped TiO2 catalyst

采用溶胶凝胶法制备了氮掺杂二氧化钛光催化剂,用XRD、SEM、FTIR和粒度分析仪对催化剂进行了表征,并且在可见光作用下对曙红Y溶液进行了光催化降解实验。研究了催化剂的投加量、曙红Y的初始浓度、光照时间和pH对曙红Y溶液的光降解效果。结果表明,以可见光作光源,催化剂的投入量为0.4 g,曙红Y溶液的初始浓度为20 mg/L,光照时间为50 min,pH=4条件下,曙红Y溶液的降解率达98.87%。Nitrogen-doped TiO2 were prepared by sol-gel method, and charactered by means of XRD, SEM, IR and particles size analysis. Photoeatalytie degradation of wastewater from eosin solution was also studied by using nitrogen-doped TiO2 as catalyst and visible light as light source. The influences of the dosage of catalyst, concentration of eosin Y, photocatalytic reaction time and pH were investigated. The optimum conditions are found ： the proper dosage of nitrogedoped TiO2 catalyst is 0. 4 g, concentration of eosin Y solution is 20 mg/L, the photocatalytie reaction time is 45 min,pH =4, decolorization rate of eosinY solution is 98.87 %.国家自然科学基金资助项目(41061044);广西自然科学基金重点项目(2010GXNSFD013016);广西自然科学基金面上项目(2012GXNSFAA053017

Research progress on preparation of amino-terminated hyperbranched

在重金属污染日益严重的今天,重金属污染的治理已经越来越受到广泛的关注。纤维素分子含有大量的羟基,但天然纤维素吸附能力并不好,通过化学改性后可成为性能良好的吸附剂。纤维素无污染、易生物降解、且来源广泛价格低廉,对其研究已成为该领域的热点,并已被广泛应用于重金属污染治理领域。超支化聚合物大分子作为一类制备工艺并不繁琐且容易得到树状高分子聚合物,其最大特点就是准球形的分子结构及末端官能团的可控性,其研究愈加受到关注。本文在文献综述的基础上,提出合成一种含有端氨基超支化合物结构的蔗渣改性重金属吸附剂的可行性技术设想。ABSTRACT: On account of the pollution problems caused by heavy metals becoming more and more serious, the technology of heavy metal treatment has received more and more attentions in nowadays. As an effective adsorbent, cellulosic materials were largely developed on industrial purpose being abundant in hydroxyl groups, but the adsorption ability of natural cellulose was still unsatisfactory for its large numbers of internal and interactive hydrogen bonds. Therefore, some modifications should be taken on the surface of cellulose molecular. Because of its unique properties of non-polluting, easily degradable, facile available, and low-cost, modified cellulose as heavy metal absorbent has already been intensively applied in separating and extracting of heavy metal ions from aqueous solution in this decade. Known as a type of dendritic polymers, the preparation processes of hyperbranched polymers are simple, and its torispherical molecular structure and terminal functional groups are controllable. Hence, the technology and development of these hyperbranched polymers are becoming more and more popular to current researchers. This paper reviewed the progress and proposed a feasible idea on synthesis of a containing amino terminated hyperbranched polymer structure of bagasse modification of heavy metal adsorbent.国家自然科学基金项目(41461092,41061044);广西自然科学基金项目(2012GXNSFAA053017

Adsorption of Cu2 + and Ni2 + in dual ion system

利用木屑制备木屑黄原酸盐吸附剂,对其进行FTIR、XRD和BET分析,并考察了对双离子体系中铜镍离子的吸附情况,重点研究了木屑黄原酸盐吸附量的预测和吸附初始速率的计算。结果表明,在铜镍双离子体系中,利用扩展的Langmuir模型能很好地预测木屑黄原酸盐对铜镍离子的吸附;吸附之初,吸附速率很快,并且随着干扰离子的浓度增大,所考察离子的初始速率逐渐减小。吸附情况说明,木屑黄原酸盐是一种具有良好吸附性能的吸附材料。Abstract Sawdust xanthate was prepared from sawdust． And it was characterized by FTIＲ，XＲD and BET． The adsorption of Cu2 + and Ni2 + on sawdust xanthate for the dual ion system，especially adsorption capacity of the adsorbent and the initial adsorbing rate，was investigated． The results showed that extended Langmuir model could predict the adsorption behavior for the Cu-Ni dual ion system． The adsorption rate was very high at the beginning，while the rate decreased with the increase of the concentration of interference ions． The results demonstrated that sawdust xanthate has good affinity for metal ions．国家自然科学基金资助项目(41061044);广西自然科学基金重点资助项目(2010GXNSFD013016);广西自然科学基金面上项目(2012GXNSFAA053017

Photocatalytic Degradation of Cr （Ⅵ） and 2-Naphthol in Water Using Sulfur-doped TiO2 Catalyst

采用自制的S/Ti O2作为光催化剂,在可见光下进行光催化降解2-萘酚和还原Cr（VI）的实验。考察了S/Ti O2投加量、2-萘酚初始浓度和p H值对2-萘酚降解光催化性能的影响及Cr（VI）~2-萘酚混合体系光催化反应的研究。结果表明：S/Ti O2投加量为2.0 g/L,2-萘酚溶液初始浓度18.75 mg/L,p H值为6~7时2-萘酚光催化降解效果最好;混合体系中的2-萘酚的降解率及Cr（VI）还原率均较相应的单一体系高,Cr（VI）的还原与2-萘酚的氧化之间产生了协同效应。Cr（VI）和2-萘酚的光催化反应均为拟一级反应动力学。Photocatalytic degradation of 2-naphthol and reduction of Cr（Ⅵ） was studied by using sulfur-doped TiO2 as photo catalyst and visible light as light source. The influences of the dosage of catalyst, initial concentration of 2-naphthol and pH were investigated and study on visible photocatalytic of Cr（Ⅵ） -2-naphthol compound system. The optimum conditions are found： the proper dosage of sulfur -doped TiO2 catalyst is 2.0 g/L, concentration of 2-naphthol is 18.75 mg/L and pH = 6 - 7. In Cr （Ⅵ） - 2-naphthol compound system, 2-naphthol and Cr （VI） were more efficiently eliminated than in the single 2-naphthol or Cr（VI） system. The reduction of Cr（VI） and the oxidation of 2-naphthol produced a synergistic effect. The photocatalytic reduction of Cr（VI） and oxidation of 2-naphthol followed the pseudo first order reaction kinetics.国家自然科学基金项目(41061044,41461092);广西自然科学基金面上项目(2012GXNSFAA053017);广西林产化学与工程协同创新中心基金项目(2013A10);广西民族大学研究生教育创新计划项目(gxun-chx2014095)资