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。
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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