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Acta Physico-Chimica Sinca  2016, Vol. 32 Issue (3): 753-762    DOI: 10.3866/PKU.WHXB201512294
ARTICLE     
Microwave-Assisted Synthesis of Esterified Bacterial Celluloses to Effectively Remove Pb(Ⅱ)
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Abstract  

以细菌纤维素(BC)为原料,通过微波辅助酯化改性的方法制得了两种改性细菌纤维素,细菌纤维素黄原酸酯(XMBC)和细菌纤维素硫酸酯(SMBC)。对所制备的样品进行X射线衍射(XRD)、扫描电镜-电子能谱(SEM-EDS)、傅里叶变换红外(FT-IR)光谱和BET比表面积分析,通过续批式实验考察其对Pb(Ⅱ)的去除效果。研究了pH值、反应时间、温度、污染物初始浓度、离子强度对其吸附能力的影响以及材料再生性能。结果表明,改性细菌纤维素的比表面积和孔容均有上升,其对Pb(Ⅱ)的吸附量随反应温度和离子强度的增加而降低,最优pH值为5.0。巯基的引入增强了细菌纤维素对Pb(Ⅱ)的吸附能力,改性后的吸附剂显示出比原始BC更优异的吸附性能,其中XMBC和SMBC的最大吸附量分别为144.93和126.58 mg·g-1,该吸附过程符合准二级速率方程和Langmuir等温吸附模型。材料对Pb(Ⅱ)的吸附是自发的放热过程,且吸附剂易于再生和重复回收。因此, SMBC和XMBC作为从水中富集分离重金属的新型材料具有及大应用前景。



Key wordsBacterial cellulose      Etherificationmodification      Microwave assistance      Biosorption      Heavymetal     
Received: 20 October 2015      Published: 29 December 2015
MSC2000:  O647  
Fund:  the Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), China(YRWEF201503);Program of Ability Construction in Shanghai Local College, China(13230502300);Program of Supporting Young Teachers in Shanghai College, China(ZZSLG14015);Shanghai Sailing Program, China(14YF1409900)
Cite this article:

. Microwave-Assisted Synthesis of Esterified Bacterial Celluloses to Effectively Remove Pb(Ⅱ). Acta Physico-Chimica Sinca, 2016, 32(3): 753-762.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201512294     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I3/753

 
 
Adsorbent Specific surface area/(m2?g-1) Total pore volume/(cm3?g-1) Pore size/mm
BC 24 0.02 15.0
SMBC 134 0.09 4.3
XMBC 126 0.05 2.8
 
 
 
 
 
Adsorbent qe, exp/(mg?g-1) Pseudo-first-order Pseudo-second-order
qe/(mg?g-1) k1/min-1 R2 qe/(mg?g-1) k2/(g?mg-1?min-1) h/(mg?g-1?min-1) R2
BC 14.54 6.87 2.89×10-2 0.9963 16.39 1.09×10-2 2.92 0.9997
SMBC 15.53 8.047 3.69×10-2 0.9558 17.24 1.88×10-2 5.59 0.9996
XMBC 16.26 12.79 6.45×10-2 0.9489 17.54 2.39×10-2 7.35 0.9998
 
 
Adsorbent Intraparticle diffusion model
kp1/(mg?g-1?h1/2) kp2/(mg?g-1?h1/2) kp3/(mg?g-1?h1/2) C1/(mg?g-1) C2/(mg?g-1) C3/(mg?g-1) (R1)2 (R2)2 (R3)2
BC 1.92 8.48×10-1 1.05×10-1 2.78 8.19 13.75 0.9951 0.9625 0.9276
SMBC 1.99 6.69×10-1 0.47×10-1 5.68 11.76 16.11 0.9961 0.9029 0.9016
XMBC 1.94 4.51×10-1 0.09×10-1 8.03 14.91 18.14 0.9654 0.9797 0.9136
 
 
Adsorbent T/K Langmuir model Freundlich model
qm/(mg?g-1) b/(L?mg-1) R2 Kf/(mg?g-1) n R2
BC 288 76.92 8.02×10-2 0.9996 6.89 1.50 0.9566
298 66.67 6.61×10-2 0.9998 6.55 1.49 0.9479
308 53.76 4.34×10-2 0.9996 5.31 1.47 0.9534
SMBC 288 136.99 9.70×10-2 0.9998 9.82 1.67 0.9598
298 126.58 9.02×10-2 0.9999 8.07 1.66 0.9628
308 107.53 6.76×10-2 0.9998 5.19 1.64 0.9704
XMBC 288 161.29 1.04×10-2 0.9996 13.42 1.95 0.9567
298 144.93 9.10×10-2 0.9997 11.18 1.87 0.9551
308 128.21 8.34×10-2 0.9999 8.27 1.80 0.9638
 
Adsorbent Adsorption capacity/(mg?g-1) Optimum pH T/K Reference
amino-bacterial cellulose 55.65 5.5 298 39
diethylenetriamine-bacterial cellulose 31.41 4.5 298 23
carboxymethylated-bacterial cellulose 60.42 4.5 298 51
ethylenediamine modified cellulose 50.00 6.0 298 52
tiol-cellulose nanofibrous 131.00 5.0 295 40
BC 16.67 5.0 298 this work
SMBC 126.58 5.0 298 this work
XMBC 144.93 5.0 298 this work
 
Adsorbent T/K ΔG0/(kJ?mol-1) ΔH0/(kJ?mol-1) ΔS0/(J?mol-1?K-1)
BC 288 -23.27 -12.02 -234.87
298 -23.31
308 -23.60
SMBC 288 -23.72 -27.17 -292.24
298 -24.37
308 -24.45
XMBC 288 -23.89 -40.25 -338.13
298 -24.39
308 -24.98
 
Cycle number Process Efficiency/%
EDTA solution Acidified thiourea solution
BC SMBC XMBC BC SMBC XMBC
1 desorption 98.78 99.12 99.35 94.02 94.87 95.13
regeneration 97.12 98.35 98.13 90.09 91.43 92.56
2 desorption 97.86 98.65 98.99 91.98 92.33 92.67
regeneration 95.16 97.01 96.44 85.93 87.54 86.43
3 desorption 95.55 96.87 97.33 87.12 89.45 88.67
regeneration 93.42 94.33 95.36 80.32 82.54 82.98
4 desorption 93.34 93.98 94.21 84.14 85.98 85.04
regeneration 91.07 91.98 92.19 75.03 76.34 75.98
5 desorption 92.15 93.23 93.04 80.34 81.65 82.25
regeneration 88.56 87.99 88.67 70.01 71.46 72.87
 
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