Abstract
In this work, the efficiency of an adsorption process, in which Moroccan diatomite (ND) is used as a low-cost adsorbent to remove Congo red (CR) dye from contaminated waters in batch and column system, was examined. The influence of experimental conditions (pH, adsorbent dose and temperature) on the adsorption of CR onto the ND adsorbent was studied. A study of the adsorption kinetics for CR revealed that a pseudo-second-order model provided the best fit to the experimental kinetic data, and the equilibrium data were well described by the Langmuir isotherm model with an adsorption capacity of 6.07 mg/g using 15 g/L of ND, pH=6, contact time 3 h and 25 °C. On the other hand, the ND regeneration tests were investigated and showed that the desorption reaches at least 50% when using ethanol as eluent. In addition, the adsorption process in a continuous mode was studied. Breakthrough curves were properly represented by the Yoon — Nelson model. Hence, the adsorption capacity of 5.71 mg/g was reached using 0.114 g of adsorbent, CR concentration of 6 mg/L and a flow of 1 mL/min under 25 °C.
摘要
以摩洛哥硅藻土(ND)为低成本吸附剂,采用批式和柱式吸附法对污染水体中刚果红(CR)染料的去除效率进行研究。考察了实验条件(pH、吸附剂剂量和温度)对ND吸附CR的影响。实验结果表明,在15 g/L ND、pH=6、接触时间为3 h、温度为25 °C的条件下,CR的吸附量为6.07 mg/g,拟二级吸附模型与实验动力学数据吻合较好,Langmuir 等温线模型能较好地描述吸附平衡数据。再生实验结果表明,当以乙醇为洗脱剂时,ND的解吸率达到50%。此外,还研究了连续模式下的吸附过程。用Yoon−Nelson 模型可以很好地解释穿透曲线。在25 °C条件下,当吸附剂用量为0.114 g,CR浓度为6 mg/L,流量为1 mL/min时,吸附量可达5.71 mg/g。
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HADRI Mohamed and HAMDAOUI Mustapha performed the experiments, analyzed and interpreted the data, writing the initial draft of the manuscript. ELMRABET Imane and CHAOUKI Zineb performed the experiments, analyzed and interpreted the data. DRAOUI Khalid analyzed and interpreted the data. DOUHRI Hikmat analyzed and interpreted the data. ZAITAN Hicham supervised, analyzed and interpreted the data, writing review & editing, conceptualization, funding acquisition, resources, validation.
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Hadri, M., El Mrabet, I., Chaouki, Z. et al. Valorization of natural diatomite mineral: Application to removal of anionic dye from aqueous solution in a batch and fixed-bed reactor. J. Cent. South Univ. 29, 2084–2098 (2022). https://doi.org/10.1007/s11771-022-5065-y
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DOI: https://doi.org/10.1007/s11771-022-5065-y