响应曲面优化兰炭基活性炭吸附亚甲基蓝的研究

采用单因素和响应曲面法对兰炭基活性炭制备工艺条件进行优化，分别讨论活化温度、活化时间和浸渍比对活性炭亚甲基蓝吸附值和收率的影响。实验得出活化影响因素由大到小顺序为：活化温度、活化时间、浸渍比。最佳工艺条件为：活化温度850℃、活化时间12h、浸渍比3∶1。最佳条件下亚甲基蓝吸附值1 224.9 mg·g^-1，收率65.89%。     

响应曲面法优化木薯酒精污泥基活性炭制备及对没食子酸的吸附性能

以木薯酒精厂生产过程中产生的脱水污泥为原料,采用响应曲面法Box-Behnken模型优化了木薯酒精污泥基活性炭的制备工艺,同时对最优成品进行一系列表征分析,并将其应用于没食子酸废水的处理研究.活性炭的最优制备条件为活化温度489℃,浸渍时间14h,活化时间51 min,氯化锌浓度21.53％,该条件下样品的碘吸附值达5...     

干熄兰炭基活性炭的制备及其吸附性能

采用物理化学活化法处理干熄兰炭进一步制备活性炭,探究了活化剂选择、碱炭比、活化温度、活化时间对活性炭吸附维生素B12溶液的影响,并且对最优条件下制备的活性炭进行SEM、BET、FIIR分析.研究表明,对比不同活化剂(ZnCl2、H3PO4、KOH)饱和溶液浸渍后得到的活性炭吸附维生素B12吸附量,KOH活化制备活性炭的...     

炭化温度对兰炭基成型活性炭性能的影响

兰炭末加入黏结剂混合成型,经炭化和活化制得成型活性炭.利用TG-DTG对热解过程中成型料的炭化行为进行探讨;测试不同炭化温度的成型活性炭的收率、抗压强度和碘吸附值,采用N2吸附法和红外光谱对450℃炭化成型活性炭的孔结构及表面化学性质进行表征.结果表明,炭化温度越高,成型活性炭的收率越小,抗压强度越小,碘吸附值越大.经450℃炭化、800℃水蒸气活化60 min制得的活性炭表面具有大量的羟基、羰基和烃羟基等活性基团,比表面积为384.53 m2/g,属于中孔隙发达的活性炭.     

竹活性炭碘吸附值对甲醛吸附性能影响的研究

考察了竹活性炭不同碘吸附值及吸附时间对甲醛吸附量的影响。结果表明:随着碘吸附值增加,竹活性炭对甲醛吸附能力也增加,在72 h内碘吸附值最高竹活性炭(744.16mg/g)其甲醛吸附能力为碘吸附值最低竹活性炭(126.83 mg/g) 的2.63倍,通过SPSS软件分析得出,竹活性炭碘吸附值与甲醛吸附成正相关,在72 h内以24 h甲醛吸附量为基准,对每隔24 h甲醛吸附增加值进行比较。结果表明竹活性炭碘吸附值越大,吸附时间越长,竹活性炭对甲醛吸附增加值也越大,且两者之间成正相关。进一步以竹活性炭碘吸附值(X₁)和吸附时间(X₂)为变量进行回归分析,得出回归方程:Y=66.215lnX₁+0.973X₂-286.66,相关系数R²为0.948。     

木质素基活性炭的制备及活化机理研究

采用磷酸活化木质素磺酸钠(Na-Ls)制备活性炭,考查磷酸浓度和活化温度对活性炭碘吸附值及得率的影响,优化制备条件.利用扫描电镜对活性炭进行了形貌表征.结果表明,活性炭制备的最佳条件为:磷酸浓度为34wt％,活化温度800℃.所得活性炭的孔结构呈裂隙状,碘吸附值为1 259.3 mg/g.利用热失重和傅里叶变换红外光谱等方法,研究了磷酸活化木质素的热分解过程和发生的物质变化.结果表明,磷酸在Na-Ls的热分解中涉及交联、催化、氧化反应;磷酸的加入改变Na-Ls热解途径的同时提高了其高温热稳定性;磷酸浓度和活化温度是影响活性炭成孔及吸附性能的重要因素.     

水蒸汽活化工艺对石油焦基活性炭性能的影响

石油焦是易石墨化炭，孔隙率低，因此用水蒸汽法直接活化，吸附性能很差，其碘吸附值小于350mg/g。通过成型法得到了合格的活性炭，并考察了烧失率、活化温度、活化时间、水流量、水炭比等对活性炭吸附性能的影响，以独山子石油焦为原料制得活性炭的碘吸附值与亚甲蓝吸附值分别达871.58，100.67mg/g。     

活性炭碘吸附值测试方法的比较和建议

对现有的几种活性炭碘吸附值的测试方法进行了比较和分析,分别用这些方法测定了一些活性炭的碘吸附值,讨论了这些方法的优缺点,针对GB／T7702．7—1997标准存在的问题,提出了一些看法和建议。     

新疆水西沟煤基活性炭活化工艺条件的优化

在一定炭化条件下,通过正交试验研究了活化温度、活化时间、活化剂用量三因素对新疆水西沟煤基活性炭性能的影响;其中对碘吸附值影响最大的为活化时间,其次为活化温度;实验确定的最优工艺条件为:活化温度900℃、活化时间3 h、活化剂(H2O)用量0.2mL/min。     

竹质活性炭的真空化学法制备及吸附性能研究

以竹质生物质为原料、ZnCl2为活化剂,对其进行真空化学活化。探讨了浸渍比(活化剂和竹粉的质量比)、浸渍时间、活化温度、活化时间等因素对活性炭产物吸附性能的影响。结果表明,真空条件下以ZnCl2为活化剂制备的竹质活性炭碘吸附值和亚甲基蓝吸附值较大,分别为1314.04 mg/g、321.07 mg/g;最佳工艺条件为:浸渍比150%,浸渍时间24 h,活化温度为600℃,活化时间为60 min。     

KOH活化法制备气化稻壳活性炭及其吸附性能

以气化稻壳炭(GRHC)为原料,KOH为活化剂制备活性炭,研究了不同活化温度和碱炭比对活性炭得率、比表面积、孔径分布以及碘值的影响.利用全自动气体吸附分析仪、X射线衍射仪、傅里叶变换红外光谱仪、扫描电镜等仪器对活性炭的理化性质进行表征,并通过吸附等温线、吸附动力学探讨其对甲基橙的吸附机制.结果表明:活化时间为1h时,随...     

Optimization of Activated Carbon Preparation from Pomegranate Peel (Punica granatum Peel) Using RSM

This research involves the optimization of different variables of the operating conditions to prepare activated carbon from pomegranate peels (Punica granatum peel). For this purpose, a statistical method called Response Surface Methodology (RSM) has been adopted to economize the number of experiments and their meaningful interpretation. Activated carbon was produced by chemical activation (H₃PO₄). RSM was used to evaluate the variables considered in the preparation of activated carbon such as impregnation ratio (2–4?g H₃PO₄/g pomegranate peel), temperature (400–600°C), and activation time (30–90?min), experimented using a three-variable Box–Behnken Design (BBD) based on a quadratic model and an RSM tool provided by Design Expert 8.0.4 (STAT-EASE Inc., Minneapolis, USA). The responses analyzed for optimization were the methylene blue number and the iodine number. The factors that are significant influencing the activated carbon preparation have been identified by an analysis of variance (ANOVA). The optimum conditions established were impregnation ratio of 2.78, activation temperature of 575°C, and activation time of 73?min.     

中孔活性碳纤维及其吸附特性

活性碳纤维具有丰富的有效吸附孔,孔径分布窄,吸脱行程短,吸脱速度快,吸附容量大。是,一般活性碳纤维的孔径较小,限制了对大分子的吸附,使其应用受到一定限制,近年来,科学工作者进行了中孔型活性炭纤维的研制,以拓宽其应用领域,本文着重阐述了中孔活性碳纤维的制造方法及其吸附特性。     

表面改性对活性炭吸附性能的影响

采用浓硝酸对活性炭进行表面氧化处理,将得到的样品分别浸渍在银氨、硫酸铜及咪唑溶液中进一步改性,然后采用Boehm滴定法对改性活性炭表面酸性基团的含量进行测定,研究改性对活性炭吸附性能的影响。结果表明：通过上述改性,活性炭表面酸性基团发生了显著变化,特别是羧基含量增加较多,从而活性诙的吸附性能发生了相应的变化。     

蒲草叶基活性炭的制备及性能研究

以蒲草叶（CL）为原料、CO₂为活化剂,采用两步法制备蒲草叶基活性炭（CL-AC）。利用SEM和BET对CL-AC的结构和形貌进行表征。结果表明CL-AC具有发达的孔隙结构。活化温度800℃、活化时间20 min条件下制得的活性炭样品（CL-AC3）的比表面积最高,达到570.03 m²/g。5 000次循环后,CL-AC3的电容保持率为90.56%。当电流密度为0.5 A/g时,比电容达到111 F/g。采用单因素试验对CL-AC3吸附亚甲基蓝的条件进行优化,结果表明,较优吸附条件为吸附剂投加量12.5 mg、溶液初始质量浓度50 mg/L、温度303.15 K、吸附时间300 min,该条件下吸附量达到199.22 mg/g。亚甲基蓝在CAC上的吸附过程遵循准二级动力学模型和Langmuir等温线,吸附过程是自发吸热。     

Preparation of activated carbon from Jatropha hull with microwave heating: Optimization using response surface methodology

Preparation of activated carbon has been attempted using steam as the activating agent by microwave heating from Jatropha hull. The response surface methodology (RSM) technique is utilized to optimize the process conditions. The influences of the three major parameters, activation temperature, activation time and steam flow rate on the properties of activated carbon are investigated using analysis of variance (ANOVA), to identify the significant parameters. The optimum conditions for the preparation of activated carbon has been identified to be an activation temperature of 900 °C, activation time of 19 min and steam flow rate of 5 g/min. The optimum conditions resulted in an activated carbon with an iodine number of 988 mg/g and a yield of 16.56% respectively, while the BET surface area evaluated using nitrogen adsorption isotherm correspond to 1350 m²/g, with the pore volume of 1.07 cm³/g. The activated carbon is hetero porous with the micropore volume contributing to 40.8%.     

Effect of Sonication in the Preparation of Activated Carbon Particles on Adsorption Performance

The impact of acid and base adsorption capacities of activated carbon (AC) particles with activation condition, contact time, specific surface area (SSA), particle size, concentration, and temperature was studied. AC was pre-treated by sonication to improve the surface characteristics and enhance its adsorption capacity. Sonication increased the SSA of AC. SEM imaging showed good dispersion and uniform AC particles with an average diameter of about 0.6 μm. The adsorption results demonstrated that AC surfaces possessed effective interactions with acids and bases, and the greatest adsorption capacity was achieved with CH₃COOH, where data were analyzed by Freundlich and Langmuir isotherms. It was found that the isotherm data correlated well with the Freundlich isotherm. Adsorption of raw AC particles increased under sonication conditions. The adsorption process with sonicated and unsonicated AC particles obeyed pseudo first-order kinetics.