酸碱改性对生物炭吸附Cr(Ⅵ)性能的影响

赵洁; 贺宇宏; 张晓明; 李琦; 杨卫春

doi:10.13205/j.hjgc.202006005

酸碱改性对生物炭吸附Cr(Ⅵ)性能的影响

doi: 10.13205/j.hjgc.202006005

中南大学冶金与环境学院国家重金属污染防治工程技术研究中心, 长沙 410083

基金项目:

国家重点研发计划项目(2018YFC1802204)。

详细信息

作者简介:
赵洁(1994-),女,硕士,主要从事重金属废水及土壤的修复治理研究工作。1403831045@qq.com

通讯作者:
杨卫春(1982-),女,博士,教授,主要从事环境功能材料制备及水污染控制研究。yang220@csu.edu.cn

计量
- 文章访问数: 876
- HTML全文浏览量: 147
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2020-03-24

EFFECT ON Cr(Ⅵ) ADSORPTION PERFORMANCE OF ACID-BASE MODIFIED BIOCHAR

Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, School of Metallurgy and Environment, Central South University, Changsha 410083, China

摘要

摘要: 生物炭因具有原料来源广泛、表面活性官能团含量丰富、性质稳定等特点,近年来,在环保领域作为重金属处理吸附剂受到越来越多的重视。使用松木屑在碳化温度为400 ℃条件下制备生物炭(简称AB400),并使用HNO₃、H₃PO₄、NH₃·H₂O、Ca(OH)₂对生物炭进行改性。借助SEM、FTIR、BET、Boehm滴定法和Zeta电位测定等方法对改性前后AB400表征,并进行Cr(Ⅵ)吸附实验。改性后生物炭结构呈半穿透至穿透状圆形塌陷,存在微孔。酸性改性条件下,HNO₃改性生物炭(简称AB400HNO₃)、H₃PO₄改性生物炭(简称AB400H₃PO₄)中酸性官能团含量均有所升高,且生物炭pH均减小,其对应pH_pzc增大,而碱改性的生物炭则反之。对于Cr(Ⅵ)的吸附,酸性改性生物炭在整体上的吸附效果优于碱性改性生物炭,其中AB400H₃PO₄吸附效果最佳,吸附容量从58.48 mg/g提高至101.82 mg/g。这是因为碱性改性生物炭表面为负电荷,与Cr(Ⅵ)的含氧阴离子相斥;而AB400HNO₃微孔容积较小,圆形塌陷数量甚微,表面虽正电荷,但吸附性能不及AB400H₃PO₄。
- 生物炭 /
- 酸碱改性 /
- Cr(Ⅵ)吸附
Abstract: Biochar attracted more and more attention as a processing adsorbent of heavy metals in the field of environmental protection, due to its wide source of raw materials, abundant active functional groups in surface, and stable physical and chemical properties. In this work, pine sawdust was used to synthesize biochar at a carbonization temperature of 400 ℃(AB400) by using HNO₃, H₃PO₄, NH₃ · H₂O, Ca (OH)₂ as the modification agent of the biochar. SEM, FTIR, Boehm titration method and Zeta potential determination were adopted to characteriza Biochar AB400. And Cr(Ⅵ) adsorption experiment was conducted. After modification, the structure of biochar appeared semi-penetrating to penetrating round collapse with micropores. Under the conditions of acid modification, the content of intermediate acid functional groups of AB400HNO₃ and AB400H₃PO₄ increased, and the pH values of biochar decreased, corresponding to the increase in pH_pzc value. As for the Cr(Ⅵ) adsorption, the overall adsorption performance of the acid modified biochar was better than that of alkaline modified biochar, and AB400H₃PO₄ achieved the best adsorption performance with an adsorption capacity increased from 58.48 mg/g to 101.82 mg/g. This was probably because the surface of alkaline modified biochar was negatively charged and repulsive to the oxygen-containing anions of Cr(Ⅵ). AB400HNO₃ had smaller volume of micropores and a smaller number of round collapses than AB400H₃PO₄. Although the surface of AB400HNO₃ was also positively charged, its adsorption performance was not as good as that of AB400H₃PO₄.
- biochar /
- acidic-alkalic modification /
- Cr (Ⅵ) adsorption

HTML全文

参考文献(31)

ZHU K R, CHEN C L, LU S H, et al. MOFs-induced encapsulation of ultrafine Ni nanoparticles into 3D N-doped grapheme-CNT frameworks as a recyclable catalyst for Cr(Ⅵ) reduction with formic acid[J]. Carbon, 2019, 148: 52-63.

许维通,苑文仪,李培中,等.六价铬污染土壤还原处理后再氧化因素分析综述[J]. 环境工程, 2018, 36(10):130-134

,58.

何忠明,王琼,付宏渊,等. 柚子皮吸附去除水中的六价铬和砷[J]. 环境工程, 2016, 34(增刊1):299-302.

ONOREVOLI B, da SILVA MACIEL G P, MACHADO M E, et al. Characterization of feedstock and biochar from energetic tobacco seed waste pyrolysis and potential application of biochar as an adsorbent[J]. Journal of Environmental Chemical Engineering, 2018, 6: 1279-1287.

MIAN M M, LIU G J. Recent progress in biochar-supported photocatalysts: synthesis, role of biochar, and applications[J]. RSC Advances, 2018, 8(26): 14237-14248.

HUSSAIN M, FAROOQ M, NAWAZ A, et al. Biochar for crop production: potential benefits and risks[J]. Journal of Soils and Sediments, 2017, 17(3): 685-716.

DIAO Z H, DU J J, JIANG D, et al. Insights into the simultaneous removal of Cr⁶⁺ and Pb²⁺ by a novel sewage sludge-derived biochar immobilized nanoscale zero valent iron: coexistence effect and mechanism [J]. Science of the Total Environment, 2018,642: 505-515.

ZHU S S, HUANG X C, WANG D W, et al. Enhanced hexavalent chromium removal performance and stabilization by magnetic iron nanoparticles assisted biochar in aqueous solution: mechanisms and application potential[J]. Chemosphere, 2018,207: 50-59.

HE R Z, PENG Z Y, LV H H, et al. Synthesis and characterization of an iron-impregnated biochar for aqueous arsenic removal[J]. Science of the Total Environment, 2018,612: 1177-1186.

XU Z B, XU X Y, TSANG D C W, et al. Participation of soil active components in the reduction of Cr(Ⅵ) by biochar: differing effects of iron mineral alone and its combination with organic acid[J]. Journal of Hazardous Materials, 2020, 384: 121455.

ZHAO Y L, ZHANG R Y, LIU H B, et al. Green preparation of magnetic biochar for the effective accumulation of Pb(Ⅱ): performance and mechanism[J]. Chemical Engineering Journal, 2019,375: 122011.

TRAKAL L, KOMÁREK M, SZÁKOVÁ J, et al. Biochar application to metal-contaminated soil: evaluating of Cd, Cu, Pb and Zn sorption behavior using single- and multi-element sorption experiment[J]. Plant Soil & Environment, 2011,57:372-380.

TAN X F, LIU Y G, ZENG G M, et al. Application of biochar for the removal of pollutants from aqueous solutions[J]. Chemosphere, 2015,125:70-85.

李蜜. 水生植物基生物炭的酸碱性、碱(土)金属浸出性及对Cu(Ⅱ)的吸附效应[D]. 上海:上海大学, 2014.

林雪原, 荆延德, 巩晨, 等. 生物炭吸附重金属的研究进展[J]. 环境污染与防治, 2014, 36(5):83-87.

杨国栋. 花生壳对水中Cr(Ⅵ)的吸附性能研究[D]. 兰州:兰州理工大学, 2009.

陈素红. 玉米秸秆的改性及其对六价铬离子吸附性能的研究[D]. 济南:山东大学, 2012.

李秋华. 改性蔗髓重金属吸附剂去除水中Cr(Ⅵ)的动力学研究[J]. 广州化学, 2015, 40(4):1-6

,33.

黄增尉,周泽广. 交联壳聚糖处理电镀废水中铬(Ⅵ)的研究[J]. 广西民族大学学报(自然科学版), 2006, 12(4):100-103.

MAHDI Z, YU Q J, EL HANANDEH A. Removal of lead(Ⅱ) from aqueous solution using date seed-derived biochar: batch and column studies[J]. Applied Water Science, 2018, 8(6): 181-181.

LEE M E, JEON P, KIM J G, et al. Adsorption characteristics of arsenic and phosphate onto iron impregnated biochar derived from anaerobic granular sludge[J]. Korean Journal of Chemical Engineering,2018, 35(7): 1409-1413.

姚瑶. 酸改性活性炭的制备及其去除Cr(Ⅵ)的研究[D]. 长沙:湖南大学, 2014.

程琼, 王海芳,卢静. 氨水改性玉米秸秆活性炭处理间苯二酚胶粘剂废水的研究[J]. 中国胶粘剂, 2016, 25(3):21-24.

李立清, 姚小龙,李海龙. 一种乙酸钙修饰的亲水性活性炭及其制备方法:CN201310520733.3[P]. 2014.

朱小涛. 表面改性活性炭对土壤中铅的吸附与稳定性能研究[D]. 武汉:武汉科技大学, 2016.

UCHIMIYA M, CHANG S, KLASSON K T. Screening biochars for heavy metal retention in soil: role of oxygen functional groups[J]. Journal of Hazardous Materials, 2011,190(1/2/3):432-441.

FANG Q L, CHEN B L, LIN Y J, et al. Aromatic and hydrophobic surfaces of wood-derived biochar enhance perchlorate adsorption via hydrogen bonding to oxygen-containing organic groups[J]. Environmental Science & Technology, 2014,48(1):279-288.

WANG H, YANG N C. Adsorption of Cr(Ⅵ) from aqueous solution by biochar-clay derived from clay and peanut shell[J]. 无机材料学报, 2020,35:301-308.

易鹏, 吴国娟,段文炎,等. 生物炭的改性和老化及环境效应的研究进展[J]. 材料导报, 2020, 34(3):37-43.

吴倩芳,张付申. 水热炭化废弃生物质的研究进展[J]. 环境污染与防治, 2012, 34(7):70-75.

DING Z H, HU X, WAN Y S, et al. Removal of lead, copper, cadmium, zinc, and nickel from aqueous solutions by alkali-modified biochar: batch and column tests[J]. Journal of Industrial and Engineering Chemistry, 2016, 33: 239-245.

施引文献

资源附件(0)

访问统计