科学研究

银杏叶生物炭对不同染料的吸附作用

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  • 陇东学院化学化工学院,庆阳 745000
张鹏会(1983-),男,讲师,硕士,主要从事水污染控制研究工作。

收稿日期: 2019-05-19

  修回日期: 2020-06-30

  网络出版日期: 2020-10-20

基金资助

国家自然科学基金(21462026);甘肃省应用化学省级重点学科建设项目资助(GSACKS20130113);陇东学院重点学科建设项目资助(LDXYKCD201704);西峰区科技计划项目(XK2018-16);甘肃省高等学校创新能力提升项目(2019B-159);甘肃省工业绿色低碳转型研究课题

Sorption property of different dyes by ginkgo biloba biochar

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  • College of Chemistry and Chemical Engineering,Longdong University,Qingyang 745000

Received date: 2019-05-19

  Revised date: 2020-06-30

  Online published: 2020-10-20

摘要

研究了700℃热解的银杏叶生物炭(GBBC)对罗丹明B(RB)和酸性红1(AR)的吸附作用,同时针对实际染料废水的特点,考察pH、吸附时间、溶液初始浓度和生物炭用量等因素对吸附效果的影响。采用SEM和BET对吸附剂的性质进行探究。实验结果表明,GBBC是一种优良的吸附剂,适用的pH范围宽(2~12)。在初始浓度为150mg/L,吸附时间55min,生物炭投加量0.3g时,对溶液中RB的吸附率达到99.61%,对AR的吸附率为97.81%(初始浓度为100mg/L,吸附时间120min,生物炭投加量0.3g)。RB吸附过程符合Pseudo-second-order动力学模型(R2=0.9534),AR吸附过程符合Elovich动力学模型(R2=0.9655)。吸附等温线拟合发现,Langmuir-Freundlich(R2=0.9888)和Langmuir(R2=0.9923)模型分别能很好地描述RB和AR的吸附行为。由此可见,GBBC是一种高效吸附剂,但对不同染料的吸附性能存在较大差异。

本文引用格式

张鹏会, 李艳春, 胡浩斌, 胡怀生, 盖轲 . 银杏叶生物炭对不同染料的吸附作用[J]. 化工新型材料, 2020 , 48(9) : 212 -217 . DOI: 10.19817/j.cnki.issn 1006-3536.2020.09.046

Abstract

The sorption of two organic dyes,Rhodamine B (RB) and acid red 1 (AR) by Ginkgo biloba biochar (GBBC) at pyrolytic temperature 700℃ were studied.The effective factors such as pH,contact time,initial concentration and adsorbent dosage were also discussed.The properties of samples were characterized by SEM and BET.The results showed that GBBC was an ideal absorbent for RB and AR removal characterized by wide adaption range of pH (from 2 to 12).The removal rate of RB was up to 99.61%,when the condition with an initial RB concentration of 150 mg/L,contact time of 55min and GBBC dosage of 0.3g,then AR removal rate was 97.81% (initial concentration 100mg/L,contact time 120min,biochar dosage 0.3g).The dynamic adsorption behavior of RB was more consistent with the pseudo-secong-order kinetic model (R2=0.9534),and kinetic of AR could be well described by Elovich model (R2=0.9655).The equilibrium sorption data were best described by the Langmuir-Freundlich (R2=0.9888) and Langmuir (R2=0.9923) model for RB and AR,respectively.GBBC was an efficient adsorbent,but the sorption mechanisms of biochar for RB and AR were different.

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