Venkataraman Sivasankar, Viswanathan Vinitha, Thangaiah Sunitha Ganesan, Omine Kiyoshi, Mylsamy Prabhakaran
Post Graduate and Research Department of Chemistry, Pachaiyappa's College Affiliated to University of Madras, Chennai, Tamil Nadu, 600 030, India.
Department of Civil Engineering, School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki, 852-8521, Japan.
Environ Sci Pollut Res Int. 2023 Oct;30(48):106718-106735. doi: 10.1007/s11356-023-29894-8. Epub 2023 Sep 22.
The present study is devoted to the removal of crystal violet dye using the synthesized barium alginate/carbon composites abbreviated as BA (barium alginate), BAAC (barium alginate/activated carbon), BASC (barium alginate/starch carbon), and BASSC (barium alginate/starch carbon modified with CTAB). The adsorptive removal of crystal violet as a function of contact time, pH of solution, composite dose, initial dye concentration, and temperature was studied. The uptake of crystal violet (CV) dye for the composites was recorded in the range of 36 mg g to 50 mg g at pH 8.03 ± 0.03 for an equilibrium time of 120 min. The adsorption kinetics and isotherms in compliance with the CV sorption onto BA/carbon composites corroborated the utmost fit of pseudo-second-order and Freundlich isotherm models, respectively. The recycling process was achieved using the barium alginate-treated bead carbons for different initial CV dye concentrations of 10-30 mg L with a scope of zero disposal. The practicability of BA/carbon composites in a groundwater sample spiked with 30 mg L of CV was successfully achieved with a removal efficiency of about 65-74%. Characterization studies for the composites using FTIR, SEM (with EDS), XRD, TGA, and BET were carried out and discussed in the paper.
本研究致力于使用合成的海藻酸钡/碳复合材料去除结晶紫染料，这些复合材料简称为BA（海藻酸钡）、BAAC（海藻酸钡/活性炭）、BASC（海藻酸钡/淀粉碳）和BASSC（用十六烷基三甲基溴化铵改性的海藻酸钡/淀粉碳）。研究了结晶紫的吸附去除与接触时间、溶液pH值、复合材料剂量、初始染料浓度和温度的关系。在pH值为8.03±0.03、平衡时间为120分钟的条件下，复合材料对结晶紫（CV）染料的吸附量在36 mg/g至50 mg/g范围内。符合CV在BA/碳复合材料上吸附的吸附动力学和等温线分别证实了伪二级和Freundlich等温线模型的最佳拟合。使用海藻酸钡处理的珠状碳对不同初始CV染料浓度为10 - 30 mg/L的溶液进行循环利用，实现了零排放。在添加了30 mg/L CV的地下水样品中，BA/碳复合材料的实用性得以成功实现，去除效率约为65 - 74%。本文对复合材料进行了傅里叶变换红外光谱（FTIR）、扫描电子显微镜（带能谱仪，SEM（with EDS））、X射线衍射（XRD）、热重分析（TGA）和比表面积分析（BET）等表征研究并进行了讨论。
