NaHCO_3处理胶乳生产污泥制备吸附剂对阳离子染料的吸附
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摘要
以胶乳生产厂脱水污泥为原料、1.40mol/L的NaHCO_3作膨胀剂,60℃浸渍并超声处理30min,污泥烘干后再经高温炭化制备吸附剂,将其用于吸附阳离子兰X-GRRL染料溶液,考察炭化温度、炭化时间、吸附剂粒径、吸附剂投加量、吸附时间及溶液pH对吸附效果的影响,并对其吸附动力学和吸附等温线类型进行了探讨。结果表明:污泥在炭化温度700℃、炭化时间120min的条件下,制备的吸附剂(粒径<0.75mm)的比表面积为118.95m~2/g,孔隙结构较为发达,对染料溶液吸附效果最佳;在振荡频率150r/min、吸附温度为25℃±0.10℃、初始染料质量浓度为250mg/L、吸附剂投加量为1.20g/L、溶液pH为5.47、吸附时间为300min时,溶液脱色率可达98.30%,染料吸附量为204.80mg/g;其吸附动力学可用准二级动力学方程进行描述;符合Langmuir型吸附等温线,属于单分子层吸附;吸附剂浸出液及吸附处理后的染料溶液的COD值分别为4.00mg/L和20.00mg/L,不会对水体造成二次污染。
In this paper, a porous carbonaceous adsorbent was prepared by using dewatered sludge from wastewater of latex-producing factory as raw materials and sodium bicarbonate as sweller. The sludge was immersed in a 1.40 mol/L NaHCO_3 solution and sonicated for 30 minutes at 60℃, then dried and carbonized at high temperature. Cationic blue X-GRRL was used to test the adsorption capacities of the obtained adsorbent. The effects of carbonization temperature, carbonization time, adsorbent sizes, dosage of adsorbent, adsorption time and pH of solution on adsorption were investigated. The adsorption kinetics and isotherm type were also studied. The results indicate that the maximum adsorption amount of carbonized sludge was prepared at 700℃ for 120 min.The carbonized sludge with the sizes of less than0.075 mm is mainly mesoporous in nature, with specific surface area reaching 118.95 m2/g. The decolorization rate of the solution was up to 98.30% and the adsorption amount of cationic dye was204.80 mg/g with oscillation frequency of 150 r/min, temperature of 25℃±0.10℃, initial dye concentration of 250 mg/L, adsorbent dosage of 1.20 g/L, pH of 5.47, and time of 300 min. The adsorption kinetic favored pseudo-second-order model, and the equilibrium adsorption data obtained fitted into the Langmuir isotherm suggesting the adsorption was monolayer. The COD values of the adsorbent leaching solution and the dye solution after adsorption were 4.00 mg/L and 20.00 mg/L, respectively, indicating that the adsorbent would not cause secondary pollution to the water body.
In this paper, a porous carbonaceous adsorbent was prepared by using dewatered sludge from wastewater of latex-producing factory as raw materials and sodium bicarbonate as sweller. The sludge was immersed in a 1.40 mol/L NaHCO_3 solution and sonicated for 30 minutes at 60℃, then dried and carbonized at high temperature. Cationic blue X-GRRL was used to test the adsorption capacities of the obtained adsorbent. The effects of carbonization temperature, carbonization time, adsorbent sizes, dosage of adsorbent, adsorption time and pH of solution on adsorption were investigated. The adsorption kinetics and isotherm type were also studied. The results indicate that the maximum adsorption amount of carbonized sludge was prepared at 700℃ for 120 min.The carbonized sludge with the sizes of less than0.075 mm is mainly mesoporous in nature, with specific surface area reaching 118.95 m2/g. The decolorization rate of the solution was up to 98.30% and the adsorption amount of cationic dye was204.80 mg/g with oscillation frequency of 150 r/min, temperature of 25℃±0.10℃, initial dye concentration of 250 mg/L, adsorbent dosage of 1.20 g/L, pH of 5.47, and time of 300 min. The adsorption kinetic favored pseudo-second-order model, and the equilibrium adsorption data obtained fitted into the Langmuir isotherm suggesting the adsorption was monolayer. The COD values of the adsorbent leaching solution and the dye solution after adsorption were 4.00 mg/L and 20.00 mg/L, respectively, indicating that the adsorbent would not cause secondary pollution to the water body.
引文
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[18]黄扬帆,刘会娥,马雁冰,等.乳液法制备石墨烯气凝胶及其吸附水中亚甲基蓝[J].化工进展, 2017, 37(8):3092-3099.HUANG Yangfan, LIU Huie, MA Yanbing, et al. Fabrication of graphene aerogels by emulsion method and their adsorption of methylene blue[J]. Chemical Industry and Engineering Progress, 2017,37(8):3092-3099.
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[20] ABRAMIAN L, ELRASSY H. Adsorption kinetics and thermodynamics of azo-dye OrangeⅡonto highly porous titania aerogel[J]. Chemical Engineering Journal, 2009, 150(2/3):403-410.
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[2]谢学辉,刘娜,朱文祥,等.印染废水脱色生物强化工程菌的构建及应用进展[J].化工进展, 2013, 32(4):869-873.XIE Xuehui, LIU Na, ZHU Wenxiang, et al. Construction of bioaugmentation engineered bacteria and their application on dyeing wastewaterdecolorizing:areview[J].ChemicalIndustryand Engineering Progress, 2013, 32(4):869-873.
[3]张华春,熊国臣.偶氮染料废水处理方法研究进展[J].染料与染色,2016(3):45-51.ZHANG Huachun, XIONG Guochen. Research progress in treatment of azo dye wastewater[J]. Dyestuffs and Coloration, 2016(3):45-51.
[4] MADRAKIAN T, MAHMOOD-KASHANI H, AHMADI M, et al.Adsorption of some cationic and anionic dyes on magnetite nanoparticles-modified activated carbon from aqueous solutions:equilibrium and kinetics study[J]. Journal of the Iranian Chemical Society, 2013, 10(3):481-489.
[5]王家宏,张迪,尹小龙,等.污泥活性炭的制备及其对酸性刚果红G的吸附行为[J].环境工程学报, 2015, 9(1):58-64.WANG Jiahong, ZHANG Di, YIN Xiaolong, et al. Preparation of activated carbon from activated sludge and its adsorption behavior for acid scarlet G[J]. Chinese Journal of Environmental Engineering,2015, 9(1):58-64.
[6]邵瑞华,房平,司全印.污水处理厂污泥制备活性炭的研究[J].安徽农业科学, 2010,38(31):17632-17635.SHAO Ruihua, FANG Ping, SI Quanyin.Research on preparation of activated carbon from sewage sludge[J].Journal of Anhui Agricultural Sciences, 2010,38(31):17632-17635.
[7] LI Xin, WANG Guangzhi, LI Weiguang, et al.Adsorption of acid and basic dyes by sludge-based activated carbon:isotherm and kinetic studies[J].Journal of Central South University, 2015, 22(1):103-113.
[8] XIAO Benyi, DAI Qin, YU Xiao, et al. Effects of sludge thermalalkaline pretreatment on cationic red X-GRL adsorption onto pyrolysis biochar of sewage sludge[J]. Journal of Hazardous Materials, 2018,343:347-355.
[9] KACAN E.Optimum BET surface areas for activated carbon produced from textile sewage sludges and its application as dye removal[J].Journal of Environmental Management,2016,166:116-123.
[10]潘云霞,刘澜,郑怀礼.NaOH改性稻秆对亚甲基蓝染料吸附性能的研究[J].农机化研究, 2012, 34(8):200-203.PAN Yunbin, LIU Lan, ZHENG Huaili.Adsorption of methylene blue from aqueous solution by NaOH-modified rice straw[J]. Journal of Agricultural Mechanization Research, 2012, 34(8):200-203.
[11]马留可,詹福如.活性炭对水中亚甲基蓝的吸附性能研究[J].化学工程, 2016, 44(1):28-32.MA Liuke, ZHAN Furu.Adsorption properties of methylene blue from wastewater by activated carbon[J].Chemical Engineering, 2016,44(1):28-32.
[12] KARHU K, MATTILA T, BERGSTROM I, et al. Biochar addition to agricultural soil increased CH4, uptake and water holding capacityresults from a short-term pilot field study[J].Agriculture Ecosystems&Environment, 2011, 140(1):309-313.
[13]任丹丹,丁文明.改性木屑吸附除亚甲基蓝性能[J].环境工程学报, 2016, 10(4):1823-1828.REN Dandan, DING Wenming. Adsorption of methylene blue from aqueous solution by modified sawdust[J]. Chinese Journal of Environmental Engineering, 2016, 10(4):1823-1828.
[14]廖希凯,满小媛,宁寻安,等.炭化温度对废旧布袋制备活性炭性能的影响及其表征[J].环境科学学报, 2015, 35(11):3775-3780.LIAO Xikai, MAN Xiaoyuan, NING Xunan, et al. Effects of carbonization temperature on characteristics of activated carbon from waste filter bag[J]. Acta Scientiae Circumstantiae, 2015, 35(11):3775-3780.
[15]赵涛.染整工艺与原理[M].北京:中国纺织出版社, 2009:200-201.ZHAO Tao. Dyeing and finishing process and principle[M].Beijing:China Textile&Apparel Press, 2009:200-201.
[16] KAVITHA D, NAMASVAYAM C. Experimental and kinetic studies on methylene blue adsorption by coir pith carbon[J]. Bioresour. Technol.,2007, 98(1):14-21.
[17] SRIVASTAVA V C, SWAMY M M, MALL I D, et al. Adsorptive removal of phenol by bagasse fly ash and activated carbon:equilibrium, kinetics and thermodynamics[J]. Colloids&Surfaces A:Physicochemical&Engineering, 2006, 272(1):89-104.
[18]黄扬帆,刘会娥,马雁冰,等.乳液法制备石墨烯气凝胶及其吸附水中亚甲基蓝[J].化工进展, 2017, 37(8):3092-3099.HUANG Yangfan, LIU Huie, MA Yanbing, et al. Fabrication of graphene aerogels by emulsion method and their adsorption of methylene blue[J]. Chemical Industry and Engineering Progress, 2017,37(8):3092-3099.
[19] TAN Yanqing, CHEN Man, HAO Yongmei. High efficient removal of Pb(Ⅱ)by amino-functionalized Fe3O4magnetic nano-particles[J].Chemical Engineering Journal, 2012, 191:104-111.
[20] ABRAMIAN L, ELRASSY H. Adsorption kinetics and thermodynamics of azo-dye OrangeⅡonto highly porous titania aerogel[J]. Chemical Engineering Journal, 2009, 150(2/3):403-410.
[21] XIAO Guqing, FU Lichun, LI Aimin. Enhanced adsorption of bisphenol A from water by acetylaniline modified hyper-cross-linked polymeric adsorbent:effect of the cross-linked bridge[J]. Chemical Engineering Journal, 2012, 191(19):171-176.
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