Gode Fethiye, Atalay Elif Dincturk, Pehlivan Erol
Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Turkey.
J Hazard Mater. 2008 Apr 15;152(3):1201-7. doi: 10.1016/j.jhazmat.2007.07.104. Epub 2007 Aug 6.
The adsorption of Cr(VI) from aqueous solutions on sawdust (SD), base extracted sawdust (BESD) and tartaric acid modified sawdust (TASD) of Turkish red pine tree (Pinus nigra), a timber industry waste, was studied at varying Cr(VI) concentrations, adsorbent dose, modifier concentration and pH. Batch adsorption studies have been carried out. Sawdust was collected from waste timber industry and modified with various amount of tartaric acid (TA) (0.1-1.5M). The batch sorption kinetics has been tested and the applicability of the Langmuir and Freundlich adsorption isotherms for the present system has been tested at 25+/-2 degrees C. Under observed test conditions, the equilibrium adsorption data fits the linear Freundlich isotherms. An initial pH of 3.0 was most favorable for Cr(VI) removal by all adsorbents. Maximum Cr(VI) was sequestered from the solution within 120 min after the beginning for every experiment. The experimental result inferred that chelation and ion exchange is one of the major adsorption mechanisms for binding metal ions to the SD. Percentage removal of Cr(VI) was maximum at the initial pH of 3.0 (87.7, 70.6 and 55.2% by TASD, BESD, and SD, respectively). Adsorption capacities range from 8.3 to 22.6 mg/g for SD samples.
研究了土耳其赤松（Pinus nigra）木材工业废料锯末（SD）、碱提取锯末（BESD）和酒石酸改性锯末（TASD）对水溶液中Cr(VI)的吸附，考察了不同Cr(VI)浓度、吸附剂用量、改性剂浓度和pH值的影响。进行了批量吸附研究。锯末取自木材工业废料，并用不同量的酒石酸（TA）（0.1 - 1.5M）进行改性。测试了批量吸附动力学，并在25±2℃下测试了Langmuir和Freundlich吸附等温线对本体系的适用性。在观察到的试验条件下，平衡吸附数据符合线性Freundlich等温线。初始pH值为3.0对所有吸附剂去除Cr(VI)最为有利。每次实验开始后120分钟内，溶液中的Cr(VI)被最大程度地螯合。实验结果表明，螯合和离子交换是金属离子与SD结合的主要吸附机制之一。在初始pH值为3.0时，Cr(VI)的去除率最高（TASD、BESD和SD分别为87.7%、70.6%和55.2%）。SD样品的吸附容量范围为8.3至22.6 mg/g。
