污染控制技术及原理
彭康,胡勇有,王宝娥.预处理烟束曲霉死菌体与Cr的相互作用及机理[J].环境科学学报,2008,28(9):1751-1757
预处理烟束曲霉死菌体与Cr的相互作用及机理
- Mechanism of chromium removal by pretreated dead Aspergillus fumisynnematus biomass
- 基金项目：广州市环境保护局资助项目(穗计[006])
- 作者
- 单位
- 彭康
- 华南理工大学环境科学与工程学院, 广州 510640
- 胡勇有
- 华南理工大学环境科学与工程学院, 广州 510640
- 王宝娥
- 仲恺农业技术学院环境科学与工程系, 广州 510225
- 摘要：采用投加预处理烟束曲霉(Aspergillus fumisynnematus)死菌体的方法去除含铬废水中的Cr(VI).考察了不同溶液初始pH值、Cr(VI)初始浓度、死菌体投加量及温度条件下,CTAB预处理烟束曲霉死菌体对Cr(VI)还原速率和总Cr的平衡吸附率的影响,并根据红外光谱分析初步探讨了CTAB预处理烟束曲霉死菌体与Cr的相互作用机理.结果表明:CTAB预处理烟束曲霉死菌体对总Cr有良好的吸附效果,在30℃,150r·min-1,pH2.0的条件下,在100mL浓度20mg·L-1的Cr(VI)溶液中投加0.5gCTAB预处理烟束曲霉死菌体,2h内总Cr最大吸附率达到了72%,约为原死菌体总Cr吸附率的2倍.但反应达到平衡后的总Cr吸附率下降到30%左右.吸附平衡后的解吸实验结果表明Cr(VI)几乎全部被还原为Cr(III).在实验pH值范围内,pH值越低、Cr(VI)初始浓度越小、预处理死菌体投加量越大以及温度越高,越有利于Cr(VI)的还原;pH值越高、Cr(VI)初始浓度越小、预处理死菌体投加量越大以及温度越低,对总Cr的平衡吸附率越大.预处理死菌体与Cr的相互作用主要是氨基和羧基与不同形态Cr的吸附作用以及菌体对Cr(VI)的还原作用.
- Abstract：Dead Aspergillus fumisynnematus fungal biomass was pretreated with CTABto enhance its chromium removal capacity.The influence of pH,Cr(VI)concentration,biomass dosage and temperature on the Cr(VI)reduction rate and total Cr equilibrium adsorption rate by CTABpretreated biomass were evaluated,and mechanisms for Cr removal are preliminarily discussed according to the experimental data and FTIRanalysis.The results showed that CTAB pretreated biomass has a high adsorption rate for total Cr.Under the conditions of 30 ℃,150 r·min-1,pH2.0,0.5 g biomass dosage and initial Cr(VI)concentration 20 mg·L-1,the maximum adsorption rate for total Cr by CTABpretreated biomass reached 72% within 2 hours-twice the rate of the original biomass.The adsorption rate for total Cr dropped to about 30% when the reaction reached equilibrium.Desorption experiments showed that mainly Cr(III)was bound to the biomass surface after adsorption equilibrium was reached.Under the experimental conditions,the Cr(VI)reduction rate increased with the decrease of pH and initial Cr(VI)concentration,and with the increase of biomass dosage and temperature.The equilibrium adsorption rate for total Cr increased with the increase of pH and biomass dosage,and with the decrease of Cr(VI) concentration and temperature.FTIR analysis indicated that amino and carboxylate groups are the main functional groups in the reaction between pretreated biomass and Cr.
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