共查询到20条相似文献，搜索用时 171 毫秒
1.
翁晴 《福建工程学院学报》2018,(1):22-27
以笋壳为原材料,经过NaOH活化、碳化后制得笋壳基活性炭,研究了其对重金属及有机污染物的单独和共吸附性能。选取Cu(Ⅱ)和亚甲基蓝（MB）作为复合污染水体的特征污染物,探讨活性炭对两者的单独和共吸附性能,并从动力学角度探讨了吸附机理。结果表明,不同类型的污染物单独存在时,笋壳基活性炭对Cu(Ⅱ)和MB的吸附量分别是6.55 mg/g和 18.26 mg/g;而当上述两种污染物共存时,吸附量均明显下降,这说明Cu(Ⅱ)和MB存在竞争吸附。准二级动力学方程很好地描述了笋壳基活性炭对Cu(Ⅱ)和MB的吸附行为。吸附速率的控制步骤是内扩散,吸附速率还受膜扩散的控制。 相似文献
2.
Elemental mercury capture on heat-treated activated carbon (TAC) was studied using a laboratory-scale fixed bed reactor. The capability of TAC to perform Hg0 capture under both N2 and baseline gas atmospheres was studied and the effects of common acid gas constituents were evaluated individually to avoid complications resulting from the coexistence of multiple components. The results suggest that surface functional groups (SFGs) on activated carbon (AC) are vital to Hg0 capture in the absence of acid gases. Meanwhile, the presence of acid gas components coupled with defective graphitic lattices on TAC plays an important role in effective Hg0 capture. The presence of HCl, NO2, and NO individually in basic gases markedly enhances Hg0 capture on TAC due to the heterogeneous oxidation of Hg0 on acidic sites created on the carbon surface and catalysis by the defective graphitic lattices on TAC. Similarly, the presence of SO2 improves Hg0 capture by about 20%. This improvement likely results from the deposition of sulfur groups on the AC surface and oxidation of the elemental mercury by SO2 due to catalysis on the carbon surface. Furthermore, O2 exhibits a synergistic effect on Hg0 oxidation and capture when acid gases are present in the flue gases. 相似文献
3.
翁晴 《福建工程学院学报》2016,(4):362-366
以笋壳为原料,采用氯化锌为活化剂制备活性炭,通过正交实验研究各影响因素对活性炭性能的影响。通过静态吸附实验研究ZnCl2活化笋壳活性炭对亚甲基蓝的吸附特性,并从动力学角度探讨其吸附机理。结果表明,制备活性炭主要影响因素为活化温度,其次是ZnCl2浓度,活化时间影响最小。制备活性炭的最佳条件是:ZnCl2浓度为3 mol/L,活化温度控制在400 ℃,活化时间2 h。活性炭对亚甲基蓝的吸附符合准二级动力学方程和Elovich方程,吸附速率控制步骤主要为膜扩散控制。等温吸附曲线与Langmuir型和Freundlich型均拟合较好,吸附过程是优惠吸附。 相似文献
4.
废弃茶梗基活性炭对孔雀石绿的吸附研究 总被引：1，自引：0，他引：1
为拓宽茶产业剩余物的开发应用途径,以氯化锌为活化剂制备了废弃茶梗基活性炭,考察了各吸附条件对其吸附孔雀石绿效果的影响,并分析了其吸附动力学行为和等温吸附方程。结果表明：溶液pH等各因素对吸附效果都有一定影响;在染料初始浓度为100mg／L、吸附pH=7、吸附温度25℃、吸附剂投量为2g／L,吸附时间为150min的条件下,活性炭对孔雀石绿吸附量为57.8mg／g,对染料的去除率达到97.5％。活性炭对孔雀石绿的吸附过程是一个物理吸附控制的准二级动力学过程,等温吸附规律更符合Langmuir等温式。 相似文献
5.
利用脐橙皮渣活性炭对水中亚甲基蓝进行吸附.探讨了吸附时间、pH值、初始浓度、活性炭用量等因素对吸附的影响.研究结果表明,脐橙皮渣活性炭对亚甲基蓝具有较好的吸附效果,最大吸附量可达40.0 mg/g.最佳吸附条件为:吸附时间80 mins,pH10.00,初始浓度5.0 mg/L,炭粉投入量0.02 g.亚甲基蓝在脐橙皮渣活性炭上的吸附等温线符合Langmuir等温式. 相似文献
6.
采用氯化钡改性的方法制备氯化钡改性膨润土。研究了振荡时间、废液的pH值、改性膨润土的用量、吸附温度、亚甲基蓝的初始浓度对改性膨润土吸附性能的影响,通过单因素试验和正交试验获得最佳吸附条件。建立了等温吸附模型,考察改性膨润土的再生能力。实验结果表明：当吸附温度为25℃,吸附剂用量为0.5g,吸附时间为20min,亚甲基蓝的浓度为70mg/L,溶液的pH值为7时,钡基改性膨润土对亚甲基蓝的吸附率达到93.25%,吸附符合Langmuir等温吸附模型,热再生率较高。 相似文献
7.
研究介孔炭材料对亚甲基兰的吸附特性,采用紫外分光光度法分别考察了不同时间、温度、浓度、pH时介孔炭材料对亚甲基兰吸附特性的影响．结果表明,亚甲基兰溶液浓度为5mg／L,温度为25℃,吸附时间为8h,pH值在9h吸附效率最高．介孔炭材料对亚甲基兰的吸附符合二级吸附动力学方程,且吸附等温线符合Freundlich式． 相似文献
8.
Adsorption of 2,4-Dichlorophenol from Aqueous Solution onto Microwave Modified Activated Carbon： Kinetics and Equilibrium 总被引：1，自引：0，他引：1
Batch experiments were conducted to investigate the adsorption of 2,4-dichlorophenol (2,4-DCP) onto microwave modified activated carbon (AC) at three different temperatures (303 K, 313 K and 323 K). Adsorption isotherms, kinetics, and thermodynamics of the adsorption process were explored. Equilibrium data were fitted into Langmuir and Freundlich equations, and the result reveals that the Freundlich isotherm model fits better than the Langmuir model. Three simplified kinetic models: pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations were adopted to examine the mechanism of the adsorption process, and the pseudo-second-order kinetic model proved to be the best in describing the adsorption data. The thermodynamic parameters of the adsorption process were estimated, showing that the adsorption of 2,4-DCP was exothermic and spontaneous, and the adsorption studied in this paper can be assigned to a physisorption mechanism. 相似文献
9.
利用以白芍秸秆废料为原料,采用磷酸活化法制备活性炭,研究了磷酸浓度、浸渍时间、炭化温度和炭化时间对白芍秸秆活性炭产品碘吸附值、亚甲基蓝吸附值和收率的影响。在最佳工艺条件下,所制备的活性炭的比表面积达到677.7 m2/g,对碘的吸附值为1098.6 mg/g,亚甲基蓝的吸附值为316.4 mg/g,收率为60.5%。 相似文献
10.
利用锯末半焦的吸附性能对亚甲基蓝溶液进行吸附实验,结果表明,pH为11,投加量为1.5g/L,温度40℃,吸附时间为60min,亚甲基蓝废水的初始浓度为15mg/L为吸附最佳条件.在此条件下锯末半焦具有良好的吸附效果,对亚甲基蓝的吸附行为符合Langmuir等温方程,脱色率可高达96.06％. 相似文献
11.
The copolymerization of CO and styrene catalyzed by Pd/C toward the formation of polyketones(PK)was studied in the N-valeronitrile-N'-methylimidazolium hexafluorophosphate([C4CNmim]+PF-6) medium. The synthesized PK was characterized by Fourier transform infrared(FTIR), elemental analysis, 13C-nuclear magnetic resonance(13C-NMR), differential scanning calorimetry(DSC), thermogravimetric analysis(TGA) and gel permeation chromatography(GPC). The supported ionic liquid film on the surface of Pd/C catalyst can prevent the products from covering the hole of active carbon due to its chemical stability and weak coordination ability with metal ions, and thus efficiently improve the catalytic activity. The effects of different amounts of ionic liquid on the catalytic activity and reusability of the catalyst and the molecular weight of PK were discussed. When the usage of ionic liquid is 10wt%(0.1 g ionic liquid / 1 g active carbon carrier) and the theoretical content of Pd2+ is 5wt%(0.05 g Pd2+/ 1 g active carbon carrier), the highest catalytic activity 2 963.64 gSTCO/(gPd·h) is achieved with the molecular weight and polydispersity index of PK as Mn=9 684, Mw=13 452 and Mw /Mn=1.389. 相似文献
12.
采用水热法,以果壳活性炭为载体,制备活性炭（AC）/二氧化锰（MnO2）纳米线复合材料。采用X射线衍射仪（XRD）、场发射扫描电子显微镜（SEM）、比表面及孔径分析仪、同步热分析仪（TG）以及紫外可见吸收光谱（UV/Vis）对所得材料的组成、形貌和结构进行表征,并对其光催化性能进行研究。结果表明:采用水热法可实现活性炭与MnO2的有效复合。在复合材料中,MnO2纳米线多以无定形态的形式存在且尺寸均一,将活性炭有效胶结在一起,从而使得活性炭比表面积和孔隙率降低,但其孔径大小保持不变。光催化实验结果表明,AC/MnO2复合材料对于有机染料具有明显、高效的降解效果,对亚甲基蓝的降解主要是吸附和光催化两者协同效应的结果。该结果拓展了活性炭在光催化领域的应用。 相似文献
13.
Carbon encapsulated iron nanoparticles(CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature(AIT) of 800 ℃. The results of high resolution transmission electron microscope(HRTEM), energy dispersive X-ray(EDX) spectroscope, X-ray diffraction(XRD), and X-ray photoelectron spectroscope(XPS) characterizations on the product B show that the thickness of the carbon shells of CEINPs in the product B is in the range of ca. 0.5—5.3 nm, i. e., which can be as thin as only two layers of graphite. The average diameter of the CEINPs is about 24. 7 nm. The total content of Fe element in the product B is 77.0 wt%. The saturation magnetization(Ms) and coercivity(Hc) of the product B are 107.4 emu/g and 143 Oe, respectively. The formation of the CEINPs in the product B is discussed briefly. 相似文献
14.
A simple and controllable layer-by-layer (LBL) assembly method was proposed for the construction of reagentless biosensors
based on electrostatic interaction between functional multiwall carbon nanotubes (MWNTs) and enzyme-mediator biocomposites.
The carboxylated MWNTs were wrapped with polycations poly(allylamine hydrochloride) (PAH) and the resulting PAH-MWNTs were
well dispersed and positively charged. As a water-soluble dye methylene blue (MB) could mix well with horseradish peroxidase
(HRP) to form a biocompatible and negativelycharged HRP-MB biocomposite. A (PAH-MWNTs/HRP-MB)
n
bionanomultilayer was then prepared by electrostatic LBL assembly of PAH-MWNTs and HRP-MB on a polyelectrolyte precursor
film-modified Au electrode. Due to the excellent biocompatibility of HRP-MB biocomposite and the uniform LBL assembly, the
immobilized HRP could retain its natural bioactivity and MB could efficiently shuttle electrons between HRP and the electrode.
The incorporation of MWNTs in the bionanomultilayer enhanced the surface coverage concentration of the electroactive enzyme
and increased the catalytic current response of the electrode. The proposed biosensor displayed a fast response (2 s) to hydrogen
peroxide with a low detection limit of 2.0×10−7 mol/L (S/N=3). This work provided a versatile platform in the further development of reagentless biosensors. 相似文献
15.
Kun XIE ;Xiang-xue WANG ;Zheng-jie LIU ;Ahmed ALSAEDI ;Tasawar HAYAT ;Xiang-ke WANG 《浙江大学学报(A卷英文版)》2014,15(8):671-680
研究目的：研究花状氧化铁的制备并探讨其对砷的吸附性能和亚甲基蓝的催化性能。
创新要点：1.合成了花状氧化铁;2.发现Langmuir模型能更好地模拟砷的吸附过程;3.发现花状氧化铁对亚甲基蓝有很好的催化降解性能。
研究方法：1.使用扫描电镜、投射电镜、X射线衍射和BET比表面及孔径分析仪对合成的花状氧化铁进行表征;2.采用静态实验法研究砷的吸附性能及亚甲基蓝的催化行为。
重要结论：1.采用一种低成本的溶剂热法合成了花状氧化铁;2.合成的花状氧化铁有着较大的比表面积并对砷有着很好的吸附性能,并且吸附率随着pH的增加而降低。同时发现Langmuir模型能更好地模拟砷的吸附过程;3.亚甲基蓝的初始浓度和花状氧化铁的用量对催化性能影响较为明显,花状氧化铁有较好的重复利用性;4.合成的花状氧化铁可以应用于大批废水的处理。 相似文献
16.
茶皂素对福寿螺纤维素酶的影响研究 总被引：2，自引：0，他引：2
从苦茶粕中提取茶皂素,用离体的方法测定它对福寿螺中消化酶-纤维素酶活性的影响．结果表明,在所测定的10-150μg／ml的浓度内,茶皂素对内切β-1,4葡聚糖酶（EG）的作用表现为先激活,后抑制;对外切β-1,4葡聚糖纤维二糖水解酶（CBH）的作用表现为激活作用,基本上不表现抑制作用． 相似文献
17.
研究采用机械力化学辅助作用下制备高吸附性能木质活性炭,探讨了研磨时间、浸渍比（磷酸与绝干杉木屑的质量之比,下同）、磷酸浓度对所制备活性炭的碘吸附值和亚甲基蓝吸附值的影响;同时,采用比表面积及孔隙分析仪和傅立叶红外光谱仪（FT-IR）对活性炭的表面官能团、比表面积、孔容及孔径分布等进行了表征.分析显示：经过机械力化学辅助作用处理后,机械力化学激活作用有利于木屑与磷酸之间发生更多的化学反应,同时促进更多纤维素发生热解;此外,机械力化学辅助作用可能降低了纤维素热解过程中聚合及芳构化阶段的温度;通过N2吸附等温线分析表明机械力化学法所制备活性炭具有丰富的微孔结构. 相似文献
18.
马腾飞 《宁德师专学报(自然科学版)》2009,21(4):358-362
以模拟可见光为光源,在自制纳米Cu2O粉末悬浮体系中,以亚甲基蓝溶液光催化降解反应为模型,研究影响亚甲基蓝光催化降解的各种因素．结果表明：对于浓度为10mg／L的亚甲基蓝溶液,当催化剂与亚甲基蓝溶液的固液比为5g／L时,太阳光辐照2h后,降解率能够达到92．46％,且加入H2O2、提高溶液pH值等方法可以显著提高亚甲基蓝的脱色降解速率． 相似文献
19.
以木屑为原料,高温热解制备生物炭。以聚乙烯醇为粘结剂,采用混合法将生物炭与果胶复合,并负载磁性,经烘干定型制备果胶包覆的磁性生物炭材料（果胶@生物炭-Fe3O4）。采用扫描电镜（SEM）、X射线衍射（XRD）及N2吸附-脱附（BET）等方法对果胶@生物炭-Fe3O4进行表征,结合吸附实验分析其对Cu2+的吸附特性。结果表明,当生物炭、果胶、Fe3O4质量比为5：1：1,溶液pH值为6,吸附24 h,果胶@生物炭-Fe3O4对Cu2+吸附效果最好;二级动力学方程能较好地描述果胶@生物炭-Fe3O4对Cu2+的吸附过程,Freundlich模型能较好地拟合其吸附行为;SEM结果显示该材料具有不规则的孔隙结构;XRD分析显示纳米Fe3O4是其主要的晶体结构;BET测得其比表面积为25.654 m2·g-1,平均孔径为20.18 nm。 相似文献
20.
埃洛石纳米管表面修饰及其对次甲基蓝的吸附研究 总被引：2，自引：0，他引：2
采用硅烷偶联剂对埃洛石纳米管(HNTs)进行表面修饰,通过透射电子显微镜(TEM)、红外光谱仪(FTIR)、分光光度计等对HNTs的结构和吸附性能进行了表征。结果表明,硅烷偶联剂通过化学键实现了对HNTs的表面修饰,提高了HNTs在溶液中的分散稳定性;适当提高溶液温度、延长吸附时间及增加溶液pH值有助于提高HNTs对次甲基蓝的吸附量。当溶液温度为303K,吸附时间为90min,溶液pH值为7时,表面修饰HNTs的吸附量可达8.91mg/g,相对于表面未修饰HNTs(同等条件下的吸附量为7.83mg/g)明显提高。吸附后的表面修饰HNTs经过再生处理后,吸附量可达到7.66mg/g。 相似文献