Department of Biochemistry, Periyar University, Salem, Tamil Nadu, India.
J Hazard Mater. 2011 Feb 15;186(1):827-34. doi: 10.1016/j.jhazmat.2010.11.067. Epub 2010 Nov 24.
Thespesia populnea is a large tree found in the tropical regions and coastal forests of India. Its pods were used as a raw material for the preparation of activated carbon. The prepared activated carbon was used for the adsorptive removal of Orange G dye from aqueous system. The effects of various parameters such as agitation time, initial dye concentration and adsorbent dosage were studied using response surface methodology (RSM). RSM results show that 0.54 g of activated carbon was required for the maximum adsorption of Orange G dye (17.6 mg L(-1)) within a time period of 4.03 h. Adsorption data were modeled using Freundlich and Langmuir adsorption isotherms. The adsorption of Orange G dye by activated carbon obeyed both Fruendlich and Langmuir isotherm. Adsorption kinetic data were tested using pseudo-zero, first, second-order and intraparticle diffusion models. Kinetic studies revealed that the adsorption followed pseudo-second-order reaction with regard to the intraparticle diffusion. FTIR spectral result indicated all the functional group except primary amines (3417 cm(-1)) and CN (1618 cm(-1)) were involved in the adsorption process. XRD data showed that Orange G dye adsorbed activated carbon might not induce the bulk phase changes. SEM results showed that the surface of the activated carbon was turned from dark to light color after dye adsorption.
木槿是一种生长在印度热带地区和沿海森林中的大树。它的豆荚曾被用作制备活性炭的原料。所制备的活性炭被用于从水溶液中吸附去除橙 G 染料。通过响应面法（RSM）研究了各种参数的影响，如搅拌时间、初始染料浓度和吸附剂用量。RSM 结果表明，在 4.03 小时的时间内，需要 0.54 克活性炭才能最大程度地吸附橙 G 染料（17.6 mg/L）。使用 Freundlich 和 Langmuir 吸附等温线对吸附数据进行建模。橙 G 染料的吸附既符合 Freundlich 等温线，也符合 Langmuir 等温线。使用拟一级、一级、二级和内扩散模型对吸附动力学数据进行了测试。动力学研究表明，吸附过程遵循伪二级反应，涉及内扩散。FTIR 光谱结果表明，除伯胺（3417 cm(-1))和 CN（1618 cm(-1))外，所有官能团都参与了吸附过程。XRD 数据表明，吸附橙 G 染料的活性炭可能不会引起体相变化。SEM 结果表明，吸附染料后，活性炭的表面颜色从深变浅。
