發(fā)布時(shí)間：2018-05-04 22:19

  本文選題：甘蔗渣 + 固相法　； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：論文采用固相法將甲基丙烯酸甲酯(MMA)接枝到堿處理后的甘蔗渣(SCB)表面,得到SCB-g-MMA。首先采用單因素法研究了接枝單體用量、引發(fā)劑用量、水的用量以及反應(yīng)溫度和時(shí)間對(duì)接枝率和接枝效率的影響。通過(guò)紅外光譜(FT-IR)、核磁共振(NMR)、X射線衍射(XRD)、掃描電鏡(SEM)和熱重分析(TG)等方法對(duì)所制備的SCB-g-MMA進(jìn)行表征。測(cè)試結(jié)果表明MMA已成功接枝到SCB上。在單因素實(shí)驗(yàn)基礎(chǔ)上,采用響應(yīng)面法研究接枝單體用量、引發(fā)劑用量、水的用量對(duì)接枝率和接枝效率的影響。結(jié)果表明,固相法接枝改性甘蔗渣實(shí)驗(yàn)以接枝率為響應(yīng)值的最佳工藝為單體用量是SCB的20.10%、引發(fā)劑用量是SCB的12.85%、水的用量為體系50.18%;以接枝效率為響應(yīng)值的最佳工藝為單體用量為SCB的19.61%、引發(fā)劑用量SCB的13.01%、水的用量為體系51.19%。在優(yōu)化工藝條件下制備SCB-g-MMA,作為亞甲基藍(lán)(MB)的吸附劑,通過(guò)紅外光譜(FT-IR)、核磁共振(NMR)和掃描電鏡(SEM)對(duì)吸附劑進(jìn)行表征。對(duì)比SC B與SCB-g-MMA吸附劑對(duì)MB的吸附能力,表明固相接枝改性后的甘蔗渣具有更好的吸附效果。進(jìn)一步考察了吸附劑投加量、吸附時(shí)間、MB初始濃度和溶液p H對(duì)SCB-g-MMA吸附MB的影響。在室溫下,MB初始濃度在25-400mg/L范圍內(nèi),當(dāng)吸附劑投加量大于等于10g/L,溶液p H范圍在6-12,吸附時(shí)間超過(guò)40min,SCB-g-MMA對(duì)MB的去除率達(dá)到99%,對(duì)MB的吸附量可達(dá)97.3mg/g。SCB-g-MMA吸附MB的等溫線吸附符合Freundlich模型,吸附動(dòng)力學(xué)模型符合偽二階動(dòng)力學(xué)方程。在優(yōu)化工藝條件下制備SCB-g-MMA,作為改性劑加入到PVA/淀粉(ST)復(fù)合材料中,通過(guò)紅外光譜(FT-IR)、核磁共振(NMR)和掃描電鏡(SEM)對(duì)改性劑進(jìn)行表征。對(duì)比了SCB和SCB-g-MMA改性PVA/ST復(fù)合材料的效果。SEM測(cè)試表明SCB-g-MMA改性的PVA/ST復(fù)合材料界面模糊,相容性較好。進(jìn)一步研究了SCB-g-MMA的用量對(duì)PVA/ST復(fù)合材料的影響。在SCB-g-MMA含量為7phr時(shí),力學(xué)性能測(cè)試表明SCB-g-MMA改性的PVA/ST復(fù)合材料的拉伸強(qiáng)度和斷裂伸長(zhǎng)率達(dá)到最大,相比于PVA/ST基體分別提升了153.1%和277.5%;當(dāng)用量為10phr時(shí),SCB-g-MMA出現(xiàn)團(tuán)聚現(xiàn)象。
[Abstract]:In this paper, methyl methacrylate (MMA) was grafted onto the surface of alkali treated bagasse (SCB) by solid phase method to obtain SCB-g-MMA. The effects of the amount of graft monomer, initiator, water, reaction temperature and time on grafting rate and grafting efficiency were studied by single factor method. The SCB-g-MMA was characterized by FT-IR, NMR-X ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TG). The test results show that MMA has been successfully grafted onto SCB. On the basis of single factor experiment, the effects of the amount of graft monomer, the amount of initiator, the amount of water and the grafting efficiency were studied by response surface method. The results show that Solid phase grafting modification bagasse experiment with grafting rate as the response value of the optimum process as monomer dosage is SCB 20.1010, initiator dosage is SCB 12.85, water dosage is 50.18; grafting efficiency as the response value of the optimum process as monomer dosage It is 19.61 of SCB, 13.01 of initiator SCB and 51.19 of water. SCB-g-MMAwas prepared under optimized conditions and was used as an adsorbent for methylene blue MB.The adsorbents were characterized by FT-IR, NMR and SEM. Compared with the adsorption ability of SCB and SCB-g-MMA adsorbents, the results showed that bagasse modified by solid phase grafting had better adsorption effect. The effects of adsorbent dosage, adsorption time and initial concentration of MB and solution pH on the adsorption of SCB-g-MMA were further investigated. At room temperature, when the initial concentration of MB is in the range of 25-400mg/L, when the amount of adsorbent is more than 10 g / L, the pH range of solution is 6-12, the adsorption time is more than 40 min, the removal rate of MB is 99%, and the adsorption amount of MB can reach the isotherm of 97.3mg/g.SCB-g-MMA adsorption MB, which accords with the Freundlich model. The adsorption kinetic model accords with pseudo-second order kinetic equation. SCB-g-MMAwas prepared under optimized conditions and was added as modifier to PVA/ starch ST-composite. The modifier was characterized by FT-IR, NMR and SEM. The results of PVA/ST composites modified by SCB and SCB-g-MMA showed that the interface of PVA/ST composites modified by SCB-g-MMA was fuzzy and the compatibility was good. The effect of SCB-g-MMA content on PVA/ST composites was further studied. When SCB-g-MMA content is 7phr, the tensile strength and elongation at break of PVA/ST composites modified by SCB-g-MMA are the highest, which are 153.1% and 277.5% higher than that of PVA/ST matrix, respectively, and the agglomeration of SCB-g-MMA is observed when the content of 10phr is 10phr.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB306

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