甘肃中医药大学药学院,兰州 730000
College of Pharmacy, Gansun University of Chinese Medicine, Lanzhou 730000, China
为拓展小麦加工副产物麦麸蛋白(WG)在印染废水处理工业中的应用,以其中的醇溶蛋白稳定的O/W型Pickering乳液为孔模板,WG与AA原位自由基接枝聚合,制备了多孔小麦麸质蛋白-g-聚丙烯酸钠(WG-g-PNaA)水凝胶。通过FT-IR、FESEM表征手段对合成的水凝胶进行结构和表面形貌表征,考察了其对水体中亚甲基蓝(MB)的去除性能。结果表明:WG与PAA链成功接枝聚合,Pickering乳液滴被洗除后在WG-g-PNaA水凝胶网络中留下规整的连续孔隙,BET比表面积为18.04 m
;吸附热力学研究结果表明:温度对吸附影响较小,吸附动力学数据符合准二级动力学模型,物理化学静电吸附为速率控制步骤;但吸附初期Pickering乳液致孔凝胶的粒子内扩散模型的
(12.89),这说明凝胶网络中的孔隙在吸附初期有利于MB分子扩散传质,提高吸附速率。研究结果可为WG在印染废水处理中的应用提供参考。
To expand the application of wheat gluten (WG), a byproducts from wheat process, in dyeing wastewater treatment industry, gliadin stabilized O/W-Pickering emulsion was taken as template, the in situ free radical grafted polymerization of WG and AA was conducted to prepare a novel porous hydrogel, named as wheat gluten-graft-sodium polyacrylate (WG-g-PNaA) hydrogel. The structure and morphology of the porous WG-g-PNaA hydrogel was characterized by FT-IR and FESEM, and the performance on methylene blue removal by the WG-g-PNaA hydrogel was studied. The results showed that a successful grafted polymerization between WG and PAA chain, the regular and continuous pores left in WG-g-PNaA hydrogel network after removing Pickering emulsion drops by washing. The BET specific surface area was 18.04 m
. At the initial pH 9.0 and MB initial concentration not higher than 300 mg·L
, the MB removal rate could reach over 98.5% by porous WG-g-PNaA hydrogel. The adsorption process accorded with Langmuir single-layer adsorption model, the corresponding saturated adsorption amount was 2 144.2 mg·g
. The adsorption thermodynamics indicated that temperature had slight effect on adsorption. Adsorption kinetics followed the pseudo-second-order kinetic model, the rate control step was physicochemical electrostatic adsorption. However, the intra-particle diffusion model coefficient
(28.59) of the Pickering emulsion pore hydrogel at the initial adsorption stage was much higher than that of the non-Pickering emulsion pore hydrogel(12.89). This result indicated that the pores in the hydrogel network were benefited for the diffusion of MB molecules and improving the initial adsorption rate at the initial adsorption stage. This can provide reference for expand the application of wheat processing by-product in dyeing wastewater treatment.
.
Pickering乳液模板多孔WG-g-PNaA水凝胶三维网络形成过程示意图
Schematic representation of the preparation of porous WG-g-PNaA hydrogel by WG-stabilized Pickering emulsion template
WG、PNaA凝胶、WG-g-PNaA水凝胶的FT-IR图谱
FT-IR spectra of WG, PNaA hydrogel and WG-g-PNaA hydrogel
FESEM images of the samples
不同MB起始浓度下溶液pH对多孔WG-g-PNaA水凝胶平衡吸附量的影响
Effect of the solution pH on the equilibrium absorption capacity of porous WG-g-PNaA hydrogel at different initial concentration of MB
多孔WG-g-PNaA水凝胶对不同起始浓度MB的等温吸附曲线和去除率
Adsorption isotherm curves and removal rate of MB by porous WG-g-PNaA hydrogel
WG-g-PNaA水凝胶吸附MB的动力学曲线及粒子内扩散曲线
Kinetic adsorption curves and intra-particle diffusion curve for MB adsorption by WG-g-PNaA hydrogels
多孔WG-g-PNaA水凝胶对MB的吸附-脱附循环效果
Recycle adsorption-desorption results of porous WG-g-PNaA hydrogel toward MB
Parameters of pseudo-second-order model and intra-particle diffusion model for MB adsorption by WG-g-PNaA hydrogel at 25 ℃
[1] | YANG Z H, LI M, YU M D, et al. A novel approach for methylene blue removal by calcium dodecyl sulfate enhanced precipitation and microbial flocculant GA1 flocculation[J]. Chemical Engineering Journal, 2016, 303: 1-13. doi: 10.1016/j.cej.2016.05.101 |
[2] | BHARTI V, VIKRANT K, GOSWAMI M, et al. Biodegradation of methylene blue dye in a batch and continuous mode using biochar as packing media[J]. Environmental Research, 2019, 171: 356-364. doi: 10.1016/j.envres.2019.01.051 |
[3] | GADADE P R, SARDARE M D, CHAVAN A R. Studies of extraction of methylene blue from synthetic wastewater using liquid emulsion membrane technology[J]. Canadian Journal of Chemical Engineering, 2012, 91(1): 84-89. |
[4] | EL-MOSELHY M M, KAMAL S M. Selective removal and preconcentration of methylene blue from polluted water using cation exchange polymeric material[J]. Groundwater for Sustainable Development, 2018, 6: 6-13. doi: 10.1016/j.gsd.2017.10.001 |
[5] | LU J, BATJIKH I, HURH J, et al. Photocatalytic degradation of methylene blue using biosynthesized zinc oxide nanoparticles from bark extract of Kalopanax septemlobus[J]. Optik, 2019, 182: 980-985. doi: 10.1016/j.ijleo.2018.12.016 |
[6] | GE H Y, WANG C C, LIU S S, et al. Synthesis of citric acid functionalized magnetic graphene oxide coated corn straw for methylene blue adsorption[J]. Bioresource Technology, 2016, 221: 419-429. doi: 10.1016/j.biortech.2016.09.060 |
[7] | GONG J, LIU J, JIANG Z W, et al. A facile approach to prepare porous cup-stacked carbon nanotube with high performance in adsorption of methylene blue[J]. Journal of Colloid and Interface Science, 2015, 445: 195-204. doi: 10.1016/j.jcis.2014.12.078 |
[8] | PENG S C, WANG S S, CHEN T H, et al. Adsorption kinetics of methylene blue from aqueous solutions onto palygorskite[J]. Acta Geologica Sinica, 2010, 80(2): 236-242. doi: 10.1111/j.1755-6724.2006.tb00236.x |
[9] | 李丹阳, 杨蕊嘉, 罗海艳, 等. 十六烷基三甲基溴化铵改性生物炭对水中镉离子吸附性能的影响[J]. 环境工程学报, 2019, 13(8): 1809-1821. doi: 10.12030/j.cjee.201811145 |
[10] | DAI H J, HUANG Y, HUANG H H. Eco-friendly polyvinyl alcohol/carboxymethyl cellulose hydrogels reinforced with graphene oxide and bentonite for enhanced adsorption of methylene blue[J]. Carbohydrate Polymers, 2018, 185: 1-11. doi: 10.1016/j.carbpol.2017.12.073 |
[11] | WANG W, ZHAO Y L, BAI H Y, et al. Methylene blue removal from water using the hydrogel beads of poly(vinyl alcohol)-sodium alginate-chitosan-montmorillonite[J]. Carbohydrate Polymers, 2018, 198: 518-528. doi: 10.1016/j.carbpol.2018.06.124 |
[12] | MAKHADO E, PANDEY S, NOMNGONGO P N, et al. Fast microwave-assisted green synthesis of xanthan gum grafted acrylic acid for enhanced methylene blue dye removal from aqueous solution[J]. Carbohydrate Polymers, 2017, 176: 315-326. doi: 10.1016/j.carbpol.2017.08.093 |
[13] | JIANG J X, ZHANG Q H, ZHAN X L, et al. A multifunctional gelatin-based aerogel with superior pollutants adsorption oil/water separation and photocatalytic properties[J]. Chemical Engineering Journal, 2019, 358: 1539-1551. doi: 10.1016/j.cej.2018.10.144 |
[14] | 安连财, 韩久放, 章应辉, 等. 多孔有机聚合物吸附分离水体中有机污染物研究和应用进展[J]. 应用化学, 2018, 35(9): 1019-1025. doi: 10.11944/j.issn.1000-0518.2018.09.180184 |
[15] | KIM Y J, KIM I, LEE T S, et al. Porous hydrogel containing Prussian blue nanoparticles for effective cesium ion adsorption in aqueous media[J]. Journal of Industrial and Engineering Chemistry, 2018, 60: 465-474. doi: 10.1016/j.jiec.2017.11.034 |
[16] | 卢国冬, 燕青芝, 宿新泰, 等. 多孔水凝胶研究进展[J]. 化学进展, 2007, 19(4): 485-493. doi: 10.3321/j.issn:1005-281X.2007.04.006 |
[17] | 王振有, 刘会娥, 朱佳梦, 等. 乳液法制备聚乙烯醇-石墨烯气凝胶及其对纯有机物的吸附[J]. 化工学报, 2019, 70(3): 1152-1162. |
[18] | ZHU Y F, WANG W B, YU H, et al. Preparation of porous adsorbent via Pickering emulsion template for water treatment: A review[J]. Journal of Environmental Sciences, 2020, 88: 217-236. doi: 10.1016/j.jes.2019.09.001 |
[19] | ERREZMA M, MABROYK A B, MAGNIN A, et al. Surfactant-free emulsion Pickering polymerization stabilized by aldehyde-functionalized cellulose nanocrystals[J]. Carbohydrate Polymers, 2018, 202: 621-630. doi: 10.1016/j.carbpol.2018.09.018 |
[20] | KAVOUSI F, NIKFARJAM N. Highly interconnected macroporous structures made from starch nanoparticle-stabilized medium internal phase emulsion polymerization for use in cell culture[J]. Polymer, 2019, 180: 121744-121753. doi: 10.1016/j.polymer.2019.121744 |
[21] | LI J, XU X, CHEN Z X, et al. Zein/gum Arabic nanoparticle-stabilized Pickering emulsion with thymol as an antibacterial delivery system[J]. Carbohydrate Polymers, 2018, 200: 416-426. doi: 10.1016/j.carbpol.2018.08.025 |
[22] | HU Y, MA S S, YANG Z H, et al. Facile fabrication of poly(L-lactic acid) microsphere-incorporated calcium alginate/hydroxyapatite porous scaffolds based on Pickering emulsion templates[J]. Colloids and Surfaces B: Biointerfaces, 2016, 140: 382-391. doi: 10.1016/j.colsurfb.2016.01.005 |
[23] | JIANG X Y, FALCO C Y, DALBY K N, et al. Surface engineered bacteria as Pickering stabilizers for foams and emulsions[J]. Food Hydrocolloids, 2019, 89: 224-233. doi: 10.1016/j.foodhyd.2018.10.044 |
[24] | LI Z F, XIAO M D, WANG J F, et al. Pure protein scaffolds from pickering high internal phase emulsion template[J]. Macromolecular Rapid Communications, 2013, 34(2): 169-174. doi: 10.1002/marc.201200553 |
[25] | CAPRON I, CATHALA B. Surfactant-free high internal phase emulsions stabilized by cellulose nanocrystals[J]. Biomacromolecules, 2013, 14(2): 291-296. doi: 10.1021/bm301871k |
[26] | LIU H, WANG C Y. Chitosan scaffolds for recyclable adsorption of Cu(II) ions[J]. RSC Advances, 2014, 4(8): 3864-3872. doi: 10.1039/C3RA45088K |
[27] | ZHU Y F, ZHANG H F, WANG W B, et al. Fabrication of a magnetic porous hydrogel sphere for efficient enrichment of Rb+ and Cs+ from aqueous solution[J]. Chemical Engineering Research and Design, 2017, 125: 214-225. doi: 10.1016/j.cherd.2017.07.021 |
[28] | PIETSCH V L, KARBSTEIN H P, EMIN M. A Kinetics of wheat gluten polymerization at extrusion-like conditions relevant for the production of meat analog products[J]. Food Hydrocolloids, 2018, 85: 102-109. doi: 10.1016/j.foodhyd.2018.07.008 |
[29] | FU D W, DENG S M, MCCLEMENTS D J, et al. Encapsulation of β-carotene in wheat gluten nanoparticle-xanthan gum-stabilized Pickering emulsions: Enhancement of carotenoid stability and bioaccessibility[J]. Food Hydrocolloids, 2019, 89: 80-89. doi: 10.1016/j.foodhyd.2018.10.032 |
[30] | LIU X, GUO J, WAN Z L, et al. Wheat gluten-stabilized high internal phase emulsions as mayonnaise replacers[J]. Food Hydrocolloids, 2018, 77: 168-175. doi: 10.1016/j.foodhyd.2017.09.032 |
[31] | CHIOU B S, JAFRI H, CAO T, et al. Modification of wheat gluten with citric acid to produce superabsorbent materials[J]. Journal of Applied Polymer Science, 2013, 129(6): 3192-3197. doi: 10.1002/app.39044 |
[32] | SALIBY I E, ERDEI L, KIM J H, et al. Adsorption and photocatalytic degradation of methylene blue over hydrogen-titanate nanofibers produced by a peroxide method[J]. Water Research, 2013, 47: 4115-4125. doi: 10.1016/j.watres.2012.12.045 |
[33] | 施小宁, 陈晖, 张浩波, 等. 基于酵母发酵致孔的小麦麸质蛋白/聚丙烯酸钠复合多孔水凝胶的合成及溶胀性能[J]. 复合材料学报, 2018, 35(6): 1386-1394. |