本文關(guān)鍵詞：高強(qiáng)度生物質(zhì)活性炭纖維制備研究　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 活性炭纖維 抗壓強(qiáng)度 DCB 吸附

【摘要】：本文以絲瓜絡(luò)纖維為原材料,水溶性酚醛樹脂作為浸漬劑來制備活性炭纖維,研究了高強(qiáng)度生物質(zhì)活性炭纖維的制備、其表面物理化學(xué)性質(zhì)的表征及其應(yīng)用于吸附DCB廢水。根據(jù)升溫速率,預(yù)氧化溫度,預(yù)氧化時(shí)間,活化溫度,活化時(shí)間來進(jìn)行正交試驗(yàn),得出了最佳的制備條件。最佳制備條件為升溫速率為8℃/min,預(yù)氧化溫度為200℃,預(yù)氧化時(shí)間為2 h,活化溫度為850℃,活化時(shí)間為90 min。制備出最佳制備條件下的高強(qiáng)度生物質(zhì)活性炭纖維(HP-ACF)。利用熱重分析研究了絲瓜絡(luò)纖維,水溶性酚醛樹脂,浸漬水溶性酚醛樹脂絲瓜絡(luò)纖維的熱解機(jī)理,分析了水溶性酚醛樹脂與絲瓜絡(luò)纖維可能存在的反應(yīng)。選取正交試驗(yàn)的部分樣品與HP-ACF,對(duì)其進(jìn)行表面物理化學(xué)性質(zhì)表征。應(yīng)用掃描電鏡(SEM)、N2吸附-脫附等溫曲線、X射線衍射(XRD)對(duì)其表面物理性質(zhì)進(jìn)行表征;應(yīng)用傅里葉紅外光譜(FTIR)對(duì)其表面化學(xué)性質(zhì)進(jìn)行表征。結(jié)果表明,通過掃描電鏡觀察,制備出的ACF表面已經(jīng)發(fā)育生成類石墨片層結(jié)構(gòu);ACFs的N2吸附-脫附等溫曲線形狀大致相同,都屬于IUPAC分類法中的Ⅰ型吸附等溫線,以微孔為主,同時(shí)存在著少量的中孔,最終制得的最優(yōu)條件下產(chǎn)品HP-ACF,比表面積為422.47 m2/g,平均孔徑為1.820 nm,孔容為0.192 cm3/g;FTIR證明了高強(qiáng)度生物質(zhì)ACF表面含有羧基、羥基,并且證明絲瓜絡(luò)纖維在炭化活化過程形成了芳環(huán)化結(jié)構(gòu)。XRD分析表明絲瓜絡(luò)中纖維素,木質(zhì)素等的結(jié)構(gòu)被破壞,內(nèi)部分子發(fā)生重排,最終得到無定形碳材料;通過萬能試驗(yàn)機(jī)對(duì)高強(qiáng)度生物質(zhì)ACF進(jìn)行抗壓強(qiáng)度的測(cè)試,抗壓強(qiáng)度可達(dá)0.246 MPa,可見高強(qiáng)度生物質(zhì)ACF具有一定抗壓能力。選用最佳制備條件下制備的產(chǎn)品HP-ACF應(yīng)用于吸附DCB廢水。研究了溫度,pH,投加量對(duì)高強(qiáng)度生物質(zhì)ACF吸附DCB廢水的影響,結(jié)果表明:高強(qiáng)度生物質(zhì)ACF的吸附反應(yīng)為放熱反應(yīng),最佳吸附溫度為25℃;當(dāng)pH≤5時(shí),HP-ACF對(duì)DCB的去除率比較理想,當(dāng)pH5時(shí),HP-ACF對(duì)DCB的去除率急速下降;在吸附20 mg/L的DCB溶液時(shí),當(dāng)ACF投加量為1 g/L時(shí),高強(qiáng)度生物質(zhì)活性炭纖維對(duì)DCB的去除率趨向于最大值,去除率達(dá)到98.29%;分別用Langmuir吸附等溫模型與Freundlich吸附等溫模型來擬合ACF吸附DCB廢水的吸附等溫線,相關(guān)度R2都大于0.95,采用Langmuir吸附等溫模型擬合結(jié)果更加吻合;采用偽一級(jí)吸附動(dòng)力學(xué)模型和偽二級(jí)吸附動(dòng)力學(xué)模型來擬合實(shí)驗(yàn)數(shù)據(jù),偽二級(jí)吸附模型擬合的相關(guān)系數(shù)為0.9821,偽一級(jí)吸附模型擬合的相關(guān)系數(shù)為0.9534;偽二級(jí)吸附模型對(duì)高強(qiáng)度生物質(zhì)ACF吸附DCB廢水能更好的描述;吸附后高強(qiáng)度生物質(zhì)活性炭纖維采用NaOH溶液加熱再生法進(jìn)行再生,再生次數(shù)越多,ACF的平衡時(shí)的吸附容量與其再生效率都是略降的,再生四次過后,ACF的吸附容量仍然在70%以上,可見高強(qiáng)度生物質(zhì)ACF具有較好的再生效果。
[Abstract]:In this paper, loofah fiber as raw material, water soluble phenolic resin as impregnating agent to prepare activated carbon fiber, high strength of biomass activated carbon fiber preparation, characterization of the surface physical and chemical properties and its application in adsorption of DCB wastewater. According to the heating rate, pre oxidation temperature, oxidation time, activation temperature the activation time for, orthogonal test, the optimum preparation conditions. The optimum preparation conditions for the heating rate is 8 DEG /min, pre oxidation temperature of 200 DEG C, pre oxidation time was 2 h, activation temperature is 850 DEG C, the activation time of 90 min. was prepared by the best preparation of high strength biomass activated carbon under the condition of the fiber (HP-ACF). The study of Luffa fibers by thermogravimetric analysis, water soluble phenolic resin impregnation, pyrolysis mechanism of water soluble phenolic resin fiber loofah, analysis of water soluble phenolic resin with Loofah fiber possible reaction Some samples with HP-ACF. Select the orthogonal test of surface physical and chemical properties. Its properties by scanning electron microscopy (SEM), N2 adsorption desorption isotherms, X ray diffraction (XRD) were used to characterize the surface physical properties; application of Fourier transform infrared spectroscopy (FTIR) to characterize the surface chemical properties. Show that by scanning electron microscopy, ACF surface preparation has developed to generate layer structure of graphite sheet; N2 adsorption - desorption isothermal ACFs curves are roughly the same, all belong to the type of adsorption isotherms of IUPAC classification, the micropores exist in a small hole, the final optimal conditions the products of HP-ACF, specific surface area is 422.47 m2/g, the average pore size is 1.820 nm, Kong Rong 0.192 cm3/g; FTIR proved that high strength ACF biomass with carboxyl, hydroxyl, and loofah fiber in carbonization and activation process to form a Fang Ring structure.XRD analysis showed that the cellulose loofah, and wooden structure was destroyed, the internal molecular rearrangement, resulting in amorphous carbon materials; through the universal testing machine on the compressive strength of high strength ACF biomass test, the compressive strength can reach 0.246 MPa, can see the high strength ACF biomass has certain compressive capacity selection the best preparation conditions for preparation of HP-ACF products applied to the adsorption of DCB wastewater. The effects of temperature, pH, dosage of high strength ACF biomass adsorption of DCB wastewater the results showed that the adsorption of high strength ACF biomass reaction is an exothermic reaction, the optimum adsorption temperature is 25 DEG C; when pH is less than or equal to 5. HP-ACF on the removal rate of DCB is relatively ideal, when pH5 HP-ACF, the removal rate of DCB decreased rapidly; in the solution of DCB adsorption at 20 mg/L, when the ACF dosage is 1 g/L, the high strength biomass activated carbon fiber on the removal rate of DCB tends to The maximum removal rate reached 98.29%; respectively by Langmuir adsorption isothermal adsorption isotherm model and Freundlich isotherm model to fit the ACF adsorption of DCB wastewater, the related degree of R2 is greater than 0.95, the fitting results of Langmuir adsorption isotherm model is more consistent; using pseudo first-order adsorption kinetics model and pseudo two adsorption kinetic model to fit the experiment the data, correlation coefficient of the pseudo two adsorption model was 0.9821 and the correlation coefficient of the pseudo first-order adsorption model fitting is 0.9534; the pseudo two adsorption model is better for high strength ACF adsorption of DCB wastewater of biomass; biomass activated carbon after adsorption of high strength fiber with NaOH solution and heating regeneration method for regeneration, regeneration times more the equilibrium adsorption capacity of ACF, and the regeneration efficiency is decreased slightly, after four times of regeneration, the adsorption capacity of ACF is still visible in more than 70%, high intensity of biomass ACF has good regeneration effect.

【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ424.1;X703

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