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测量应用案例-20210108

2021-01-26 13:48:17

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文献名: Engineering pH-switchable UiO-66 via in-situ amino acid doping for highly selective adsorption of anionic dyes


作者:Ruimeng Wanga; Long Liua; Sidra Subhanb; Yaseen Muhammadb; Yang Hua; Meiyun Huanga; Yi Penga; Zhongxing Zhaoac; Zhenxia Zhaoac 

aSchool of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

bInstitute of Chemical Sciences, University of Peshawar, 25120 KP, Pakistan

cGuangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 520004, China


摘要:The pH-switchable UiO-66 were engineered via in-situ amino acids (AA) doping for the highly selective adsorption of anionic dyes (i.e. sunset yellow FCF (SY)). Three AA doped samples, i.e. UiO-66-V (valine), UiO-66-T (threonine), and UiO-66-Y (tyrosine), have fabricated hierarchical structure and endowed NH2 surface in framework structure concurrently. These AA doped UiO-66s awarded highly selective adsorption and fast diffusivity towards the mentioned anionic dyes. More interestingly, enriched NH2 groups endowed AA doped UiO-66s a significant pH-responsive character for selectivity of anionic/cationic dyes. Textural characterization and adsorption measurement confirmed that high surface areas (>1070 m2/g) with defected pores and NH2 surface significantly enhanced adsorption uptake (352.8 mg/g) and diffusion rate (168 × 103 min1) for SY on AA doped UiO-66s, about 1.9 and 5.9 times respectively as that on pristine UiO-66. The AA doped UiO-66s exhibited one order of magnitude higher selectivity (>390) for SY against MB than that of original UiO-66. More importantly, the alteration in surface charge (NH2-NH3+) endorsed a great variation in the selectivity of AA doped UiO-66s to dyes when adjusting pH from 4 to 8, showing an excellent pH on-off switchable property. Also, it realized a stable self-adsorption/desorption recycling process via pH-switching for 6 consecutive cycles. With these features, the pH-switchable defected UiO-66 realized highly efficiency adsorption and non-thermal separation/regeneration process for anionic dyes.

 


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同位素分析仪-甲醛分析仪-北京世纪朝阳科技发展有限公司 同位素分析仪-甲醛分析仪-北京世纪朝阳科技发展有限公司
同位素分析仪-甲醛分析仪-北京世纪朝阳科技发展有限公司