PDF《5 种秸秆生物炭吸附亚甲基蓝及其性能对比研究》

南京农业大学学报 2019?42(2):382-388 http:/ / nauxb.

njau.edu.cn Journal of Nanjing Agricultural University DOI:10.7685/ jnau.201807039 ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 收稿日期:2018-07-18 基金项目:国家大学生创新训练计划项目(201710307098) 作者简介:? 通信作者:何春霞?教授?博导?研究方向为生物质复合材料?E~mail:chunxiahe@ tom.com? 何佳闻?何春霞?郭航言?等.

5 种秸秆生物炭吸附亚甲基蓝及其性能对比研究[J]. 南京农业大学学报?2019?42(2):382-388.

5 种秸秆生物炭吸附亚甲基蓝及其性能对比研究 何佳闻?何春霞? ?郭航言?明丽 (南京农业大学工学院/ 江苏省智能化农业装备重点实验室?江苏 南京 210031) 摘要:[目的]亚甲基蓝广泛用于化学指示剂、染料、生物染色剂和药物等领域并在印染工业生产过程中会产生大量有机染 料废水并带来巨大的环境风险?为此探讨秸秆生物炭对亚甲基蓝的吸附性能? [方法]用限氧控温法在

500 ℃ 下制备

5 种 秸秆(水稻秸秆、玉米秸秆、小麦秸秆、花生秸秆、芦苇秸秆)生物炭?用电镜显微镜扫描、傅里叶红外变换光谱(FTIR)和X射线衍射对

5 种秸秆生物炭微观结构、官能团、元素进行表征?并用

5 种秸秆生物炭对亚甲基蓝溶液进行吸附性试验?对比 和分析

5 种秸秆生物炭吸附亚甲基蓝的性能? [结果]水稻秸秆、小麦秸秆和芦苇秸秆具有圆孔型微孔结构?玉米秸秆和花 生秸秆具有平行壁型微孔结构?

5 种秸秆生物炭的 FTIR 图谱均含有极性基团和芳香性结构? 它们 X 射线衍射图谱的主 峰值均出现在(2θ)介于 20.8° ~28.1°? pH 以及投入量的增加会提高秸秆生物炭吸附能力? 吸附动力学符合拟二级动力学 模型?吸附等温线符合 Langmuir 模型? 小麦秸秆生物炭对亚甲基蓝吸附能力最大?最大理论吸附量为 27.82 mg ? g-1 ?水稻秸 秆生物炭和芦苇秸秆生物炭的最大理论吸附量分别为 27.28 和22.72 mg ? g-1 ?而花生秸秆和玉米秸秆生物炭对亚甲基蓝吸 附能力较差? [结论]在5种秸秆生物炭中?小麦秸秆具有良好的表面特征和吸附亚甲基蓝能力?为有机污染吸附的优选 材料? 关键词:秸秆?生物炭?亚甲基蓝?表征?吸附性 中图分类号:TQ424.3 文献标志码:A 文章编号:1000-2030(2019)02-0382-07 Adsorption of methylene blue by five straw biochars and its performance comparison HE Jiawen?HE Chunxia? ?GUO Hangyan?MING Li (College of Engineering/ Jiangsu Key Laboratory for Intelligent Agricultural Equipment? Nanjing Agricultural University?Nanjing 210031?China) Abstract:[Objectives] Methylene blue is widely used in chemical indicators?dyes?biological dyes and pharmaceuticals. It will produce a large number of organic dye wastewater in the process of printing and dyeing industry and bring huge environmental risks. [Methods]Five kinds of biochar(rice straw?corn straw?wheat straw?peanut straw and reed straw)were prepared at

500 ℃ by the method of oxygen limiting and temperature control. The microstructure?functional group and element of biochar were characterized by scanning electron microscopy? Fourier transform infrared spectroscopy ( FTIR) and X~ray diffraction ( XRD). The adsorption experiments of methylene blue solution by five kinds of straw biochar were carried out?and the properties of five kinds of straw biochar adsorbed methylene blue solution were compared and analyzed. [Results]Rice straw?wheat straw and reed straw had round hole microporous structure?and corn straw and peanut straw had parallel wall microporous structure. The FTIR spectra of five kinds of straw biochar contained polar groups and aromatic structures. The main peak of the XRD patterns was found to be 2θ was between 20.8° and 28.1°?indicating it was an amorphous structure. pH and the increase of straw biochar input enhanced the adsorption capacity. The adsorption kinetics conformed to a pseudo~second~order kinetic model?and the adsorption isotherm accorded with the Langmuir model. The adsorption capacity of methylene blue by wheat straw biochar was the highest?which was 27.82 mg ? g-1 . The maximum theoretical adsorption capacity of rice straw and reed straw biochar were 27.28 mg ? g-1 and 22.72 mg ? g-1 ?respectively. The adsorption capacity of peanut straw and corn straw biochar to methylene blue was poor. [Conclusions]Among the five kinds of straw biochar?the wheat straw had good surface characteristics and the ability to adsorb methylene blue. It is the preferred material for the adsorption organic contaminants. Keywords:straw?biochar?methylene blue?surface features?adsorb~ability 第2期何佳闻?等:5 种秸秆生物炭吸附亚甲基蓝及其性能对比研究 生物炭是生物质在缺氧或无氧条件下裂解成的一种富碳物质[1] ?具有表面官能团丰富、碳含量高以 及孔隙结构多等特性?可作为代替活性炭用于吸附有机污染物的新型吸附剂[2] ? 亚甲基蓝(C16 H18 ClN3S)用 途广泛?主要用于化学指示剂、染料、生物染色剂和药物等领域?在印染工业生产过程中会产生大量的有机 染料废水?带来巨大的环境污染? 研究低成本吸附材料用于治理环境污染成为热门课题[1] ? 作为农产品 废弃物资源化而产生的生物质炭化新技术逐渐被人们关注[3] ? 生物炭对工业废液处理、修复环境污染具 有重要意义? 慈金娜等[4] 通过研究