先進(jìn)材料引論-活性氮化硼

1、六方氮化硼: 新型類碳材料,河北省微納氮化硼重點(diǎn)實(shí)驗(yàn)室“六方氮化硼制備及其應(yīng)用關(guān)鍵技術(shù)”教育部創(chuàng)新團(tuán)隊(duì)河北工業(yè)大學(xué)材料學(xué)院,活性氮化硼及其在環(huán)境治理中的應(yīng)用,,,,國(guó)務(wù)院《大氣污染防治行動(dòng)計(jì)劃》規(guī)定2017年全國(guó)地級(jí)及以上城市可吸入顆粒物的濃度比2013年下降10%以上；京津冀區(qū)域細(xì)顆粒物濃度下降約25%.,,高比表面積、高活性氮化硼材料,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,H2O,,,,,,,,,

2、,,,,,,,,,,,,,,,,,,,,,,,,,,,,,Fog,,H2O,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,H2O,,,SOX-,NOX-,,,,,H3O+,,,,,,,K+,SOX-,NOX-,,K+,,K+,,SOX-,,NOX-,,SOX-,,NOX-,活性炭吸附,氮化硼吸附,方向性,飽和性,共價(jià)鍵,效果不明顯,極性鍵,選擇性,B+-N-,效果顯著,,,H2O,,活性氮化硼強(qiáng)烈的脫硫、脫硝能力在環(huán)保領(lǐng)

3、域的應(yīng)用前景廣闊！,開發(fā)活性氮化硼在脫硫、脫硝方面的應(yīng)用研究,高比表面積、高活性氮化硼材料,One of the greatest problems that the world is facing today. 1.8 million children die every year from diarrhea mainly due to water contamination.,Environmental pollution,5,Ad

4、sorption for effective environmental pollution control:,convenience, easy operation, simplicity of design,幾種環(huán)境污染凈化途徑,6,高比表面積多孔BN的合成,T. Kawasaki, et al, J. Ceram. Soc. Jpn, 104[10](1996)935,Melamine diborate (M ? 2B ) mol

5、ecular crystal: C3N6H6?2H3BO3,Hydrogen-bonded structureLayer-like morphology by the interlinked planar triangular H3BO3 and C3N6H6 molecules,7,Step 1: Boric acid + melamine → M ? 2B precursor (80 ?C for 4 h),Step 2: th

6、e precursor was heated at 1460?C in N2 for 4 h to obtain porous BN,,,C3N6H6?2H3BO3,hBN,8,,Precursor,Porous BN,--Li et al. Nanotech. 24 (2013) 155603,高比表面積多孔BN的合成,High-quality porous BN with uniform hole diameter, high pu

7、rity, high surface area and large-scale yield,BET surface area:1687 m2/gPore volume: 0.99 cm3/gPore sizes: 1.3 nm, 3.9 nm,9,type I isotherm with an H4 type broad hysteresis loop,--Li et al. Nanotech. 24 (2013) 155603,高

8、比表面積多孔BN的合成,High adsorption capacity :~88 wt% of MO was removed within 5 minthe maximum removal capacity: 298.3 mg/g,高比表面積多孔BN對(duì)甲基橙的吸附,,Adsorption isotherms of MO,Adsorption rate of MO,Ce: equilibrium concentration; C

9、0 : initial solution concentration qe: adsorbed amount of pollutant on the equilibrium concentration,10,Initial concentration of 40 mg/L,Adsorption of Methyl orange (MO),- large pore volume- high density structural def

10、ects- high specific surface area,--Li et al. Nanotech. 24 (2013) 155603,The chemical activation reaction takes mainly place on the surface rather than inside.The functional groups and defects were introduced onto the

11、 surface of the resulting BN fibers via chemical activation.,11,--Li et al. J. Mater. Chem. A 5 (2015) 8492,Activating reagent： mixed solution of sulfuric acid and nitric acid Assisted by ultrasonication,B–NH2,B–OH,B–O–

12、N,高比表面積活性BN的合成,BET: From 1045 to 1104 m2/gPore volume:Form 0.57 to 0.63 cm3/g,12,Introduce functional groups onto activated BN,--Li et al. J. Mater. Chem. A 5 (2015) 8492,高比表面積活性BN的合成,活性BN對(duì)亞甲基藍(lán)的吸附,13,Exhibiting great

13、ly improved cationic dye removal performance,--Li et al. J. Mater. Chem. A 5 (2015) 8492,Faster,Higher capacity,14,The great advantages of negatively-charged activated BN adsorbing cationic dye molecules by electrostati

14、c interaction,--Li et al. J. Mater. Chem. A 5 (2015) 8492,活性BN對(duì)多種染料的吸附,15,The removal efficiency of ~ 94 % was still retained even after fifteen adsorption-regeneration cycles.,--Li et al. J. Mater. Chem. A 5 (2015) 8492

15、,吸附之后的活性BN的再生及重復(fù)利用,活性BN過濾膜的制備,16,Activated boron nitride membrane based on the combination of excellent adsorption performance of ABN, unique flow properties of fibrous membrane, and in-plane coupling between 1D BN micro

16、-ribbon and microfibrillated cellulose (MFC).,--Li et al. RSC. Adv. 5 (2015) 71537,17,--Li et al. RSC. Adv. 5 (2015) 71537,Excellent mechanical flexibility and tensile strength,ABN/MFC-70 with higher flexibility,活性BN過濾

17、膜的制備,18,Abundant functional groups,--Li et al. RSC. Adv. 5 (2015) 71537,Good hydrophilicity,活性BN過濾膜的制備,19,--Li et al. RSC. Adv. 5 (2015) 71537,Efficient removal of methylene blue (MB) from wastewater,活性BN過濾膜的對(duì)染料的吸附效果,2