Kanokwan Darasoon, Supawitch Hoijang, Tanapong Kunakham, Sorapong Janhom, S. Ananta, Gyu Leem, L. Srisombat
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引用次数: 0
摘要
在本研究中,采用氢氧化钠溶液作为蚀刻剂,化学蚀刻固体二氧化硅纳米颗粒(sSiO2 NPs),合成多孔二氧化硅纳米颗粒(pSiO2 NPs)。通过对蚀刻剂用量和蚀刻时间的优化,获得了能有效去除百草枯的最佳蚀刻条件。采用11.1 mL 1.25 M NaOH溶液和12 h的蚀刻工艺,合成的pSiO2 NPs对PQ的去除率达到90%以上。SEM和TEM结果表明,随着蚀刻剂用量的增加和蚀刻时间的延长,pSiO2纳米颗粒的孔隙率逐渐增大。孔隙率的增加提高了pSiO2 NPs的PQ去除效率。FTIR结果表明,在蚀刻过程中,二氧化硅的特征官能团仍然存在。在获得最佳蚀刻条件后,研究了PQ的吸附行为。优化了影响吸附效率的几个关键因素,即初始溶液pH、初始浓度和吸附时间。当PQ溶液浓度为100 mg L-1, pH ~7时,pSiO2纳米吸附剂对PQ的去除率在5 min内达到最大(~98%)。pSiO2 NPs对PQ的最大吸附量(qmax)为65.7 mg g-1。pSiO2纳米吸附剂制备方法简便,吸附过程快速,qmax值与其他PQ吸附剂相当,是去除PQ的有效吸附剂。
Preparation of Porous Silica Nanoparticles by Chemical Etching for Removal of Paraquat from Aqueous Solution
In t his study, solid silica nanoparticles (sSiO2 NPs) were chemically etched using sodium hydroxide solution as an etchant to synthesize porous silica nanoparticles (pSiO2 NPs). Etchant dosage and etching time were optimized to obtain the optimum etching condition providing the effective removal of paraquat (PQ). High removal efficiency of PQ by the synthesized pSiO2 NPs was obtained over 90% using 11.1 mL of 1.25 M NaOH and 12 h for the etching process. SEM and TEM images showed that the porosity of pSiO2 NPs increased with increase of the etchant dosage and etching time. The increment of porosity of pSiO2 NPs enhanced the PQ removal efficiency. FTIR result indicated that the characteristic functionalities of silica remain after the etching process. After optimum condition of etching obtained, the adsorption behavior of PQ was investigated. Several key factors influencing the adsorption efficiency, i.e., initial solution pH, initial concentration, and adsorption time were optimized. The maximum removal efficiency of PQ (~98%) by the pSiO2 nanoadsorbent was obtained using 100 mg L-1 of PQ solution at pH ~7 within 5 minutes. The maximum adsorption capacity (qmax) of the pSiO2 NPs for the PQ removal was 65.7 mg g-1. The pSiO2 nanoadsorbent is effective adsorbent for the PQ removal due to the development of a facile synthetic method for adsorbent preparation, rapid adsorption process, and comparable qmax value with other PQ adsorbents.
期刊介绍:
The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.