| 陈丽萍,斯钦达来.Cu2+改性秸秆活性炭的制备及其去除废水中As（Ⅲ）的研究[J].农业环境科学学报,2014,33(9):1823-1827. |
| Cu2+改性秸秆活性炭的制备及其去除废水中As（Ⅲ）的研究 |
| Preparation of Cu2+-Modified Straw Activated Carbon and Its Use for Removal of As（Ⅲ） from Wastewater |
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| DOI：10.11654/jaes.2014.09.021 |
| 中文关键词: As（Ⅲ） 向日葵秸秆 Cu2+改性活性炭 吸附 热力学 |
| 英文关键词: As（Ⅲ） sunflower straw copper impregnated activated carbon adsorption thermodynamics |
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| 中文摘要: |
| 以向日葵秸秆为原料，先经磷酸活化法制得活性炭，然后采用浸渍法制备载铜活性炭，研究Cu2+改性活性炭（Cu-AC）对水溶液中As（Ⅲ）的吸附等温线，并分析了吸附剂的投加量、pH、As（Ⅲ）的初始浓度和温度对Cu-AC去除As（Ⅲ）的影响。结果表明，当吸附剂的投加质量浓度为4 g·L-1、pH为12.0、温度为30 ℃时Cu-AC对As（Ⅲ）的去除率可达99.95%。Langmuir方程能更好地描述As（Ⅲ）在Cu-AC上的等温吸附特征，静态吸附容量为64.105 mg·g-1；吸附焓变ΔH>0且大于42 kJ·mol-1，说明吸附过程为吸热的化学吸附；吸附自由能ΔG<0，说明吸附为自发的反应；吸附熵变ΔS>0，说明As（Ⅲ）在Cu-AC和水溶液的固-液界面运动的随意性增强。 |
| 英文摘要: |
| Sunflower straw is agricultural waste. Here we used it to produce Cu2+-modified activated carbon after modification by phosphoric acid and copper employing impregnation method, and then employed the activated carbon to examine adsorption isotherm of As（Ⅲ） in a batch reactor. The effects of reaction time, adsorbent doses, initial concentrations of adsorbent, pH, and temperature on As（Ⅲ） adsorption by the activated carbon were evaluated. The absorbent at 4 g·L-1 was efficient, and removed As（Ⅲ） up to 99.95% at a pH of 12.0 at 30 ℃. The adsorption data fitted reasonably well to the Langmuir isotherm. The maximum adsorption capacity was 64.105 mg·g-1. Positive values of adsorption enthalpy ΔH＞42 kJ·mol-1 indicated that the adsorption process is endothermic and chemical adsorption in nature. Negative changes in free energy（ΔG） showed that the adsorption is a spontaneous process. Positive values of ΔS suggested increased randomness at the solid-solution interface during the adsorption of As（Ⅲ） from aqueous solution by Cu2+-modified activated carbon. |
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