資源描述:
《改性膨脹石墨的制備與性能研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。
1、高倍膨脹石墨的制備工藝條件研究傅修軍】,雷獻(xiàn)超1,嫦娥1,張昆1,王亦寧1,康雨1,王麗琴齊效文2(1?燕山人學(xué)環(huán)境與化學(xué)工程學(xué)院,河北秦皇附066004;2.燕山人學(xué)機(jī)械工程學(xué)院,河北秦皇島066004)摘要:膨脹石墨具有豐富的孔道結(jié)構(gòu)和較大的比表面積,是一種綠色環(huán)保型吸附材料,在處理水面溢汕和染料廢水中得到廣泛應(yīng)用。本文采用化學(xué)氧化法,以濃硫酸為插層劑,雙氧水為氧化劑成功制備膨脹石墨。同吋,通過FE~SEM、XRD等表征方法,研究了膨脹石墨的物理性能。并系統(tǒng)考察了膨脹石墨的較住制備工藝條件及其對(duì)羅丹明B溶液以及汕類的吸附性能。研究結(jié)果表明,蠕蟲狀膨脹石墨具
2、有豐富的網(wǎng)狀孔隙結(jié)構(gòu),存在分級(jí)孔道結(jié)構(gòu)。膨脹石墨的較佳制備工藝條件為:石墨(g):98%濃硫酸(mL):30%H2O2(mL)=6:10:1,插層溫度60°C,插層時(shí)間80min,微波膨化功率420W,膨化時(shí)間15s,該條件下膨脹石墨的膨脹容積為375mL/go二次插層以硝酸為插層劑較佳的制備工藝條件是:石墨(g):98%濃硫酸(mL):30%H2O2(mL):65%硝酸(mL)=6:9:1:2,插層溫度60°C,插層時(shí)間80min,微波膨化功率420W,膨化時(shí)間15so關(guān)鍵詞:膨脹石墨;化學(xué)氧化;膨脹容積;二次插層Abstract:Expandedgraph
3、iteisakindofgreenenvironmentalprotectionadsorptionmaterial,whichiswidelyusedindealingwiththewaterspilledoilandthedyewastewate匚Inthisarticle,chemicaloxidationmethodwaschoosedtoprepareexpandedgraphite,concentratedsulfuricacidwasusedasintercalatingagent,whilehydrogenperoxideasoxidant.M
4、oreover,thephysicalpropertiesoftheexpandedgraphitewerecharacterizedbyusingFE?SEM,XRD,andsoon.Inaddition,theoptimumpreparationconditionsandadsorptionperformanceofRhodamineBandoilofEGweremadeasystematicstudy.Theresearchresultsshowthat:thevermicularexpandedgraphitehasrichmeshporestmctu
5、reandhierarchicalchannelstmcture?TheoptimumpreparationconditionsofEGwentasfollows:m(natureflakegraphite):mL(concentratedsulfuricacid):mL(hydrogenperoxide)=6:10:1,thereactiontemperatureandtimewere60°Cand80minutes,microwavepuffingpowerandswellingtimewere420Wand15s,respectively.Theexpa
6、ndedvolumeofexpandedgraphitecouldreachupto375ml/g.TheoptimumpreparationconditionsofSecondintercalationEGwentasfollows:m(natureflakegraphite):mL(concentratedsulfuricacid):mL(hydrogenperoxide):mL(nitricacid)=6:9:1:2thereactiontemperatureandtimewere60°Cand80minutes,microwavepuffingpowe
7、randswellingtimewere420Wand15s.Keywords:expandedgraphite;chemicaloxidation;expandedvolume;secondintercalation刖言石墨品體是一種層狀結(jié)構(gòu)山,在強(qiáng)氧化劑作用下,石墨層間失去較活潑的兀電子而被氧化,網(wǎng)狀平面大分子轉(zhuǎn)變成帶有正電荷的平面大分子,使具有極性的插入劑(酸、堿、鹵素)分子或離了插入石墨層與碳網(wǎng)'卜而形成石墨層間化合物(GraphiteIntercalationCompounds,簡(jiǎn)稱GICs),即可膨脹石墨[2】??膳蛎浭诩訜岬竭m當(dāng)溫度吋,可瞬間
8、迅速分解,使石墨沿C軸方向膨脹成墻蟲狀