农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2014年
9期
1823-1827
,共5页
As(Ⅲ)%向日葵秸秆%Cu2+改性活性炭%吸附%热力学
As(Ⅲ)%嚮日葵秸稈%Cu2+改性活性炭%吸附%熱力學
As(Ⅲ)%향일규갈간%Cu2+개성활성탄%흡부%열역학
As(Ⅲ)%sunflower straw%copper impregnated activated carbon%adsorption%thermodynamics
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△H>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△G<0，说明吸附为自发的反应；吸附熵变△S>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。
以嚮日葵秸稈為原料，先經燐痠活化法製得活性炭，然後採用浸漬法製備載銅活性炭，研究Cu2+改性活性炭（Cu-AC）對水溶液中As（Ⅲ）的吸附等溫線，併分析瞭吸附劑的投加量、pH、As（Ⅲ）的初始濃度和溫度對Cu-AC去除As（Ⅲ）的影響。結果錶明，噹吸附劑的投加質量濃度為4 g·L-1、pH為12.0、溫度為30℃時Cu-AC對As（Ⅲ）的去除率可達99.95%。Langmuir方程能更好地描述As（Ⅲ）在Cu-AC上的等溫吸附特徵，靜態吸附容量為64.105 mg·g-1；吸附焓變△H>0且大于42 kJ·mol-1，說明吸附過程為吸熱的化學吸附；吸附自由能△G<0，說明吸附為自髮的反應；吸附熵變△S>0，說明As（Ⅲ）在Cu-AC和水溶液的固-液界麵運動的隨意性增彊。
이향일규갈간위원료，선경린산활화법제득활성탄，연후채용침지법제비재동활성탄，연구Cu2+개성활성탄（Cu-AC）대수용액중As（Ⅲ）적흡부등온선，병분석료흡부제적투가량、pH、As（Ⅲ）적초시농도화온도대Cu-AC거제As（Ⅲ）적영향。결과표명，당흡부제적투가질량농도위4 g·L-1、pH위12.0、온도위30℃시Cu-AC대As（Ⅲ）적거제솔가체99.95%。Langmuir방정능경호지묘술As（Ⅲ）재Cu-AC상적등온흡부특정，정태흡부용량위64.105 mg·g-1；흡부함변△H>0차대우42 kJ·mol-1，설명흡부과정위흡열적화학흡부；흡부자유능△G<0，설명흡부위자발적반응；흡부적변△S>0，설명As（Ⅲ）재Cu-AC화수용액적고-액계면운동적수의성증강。
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 △H>42 kJ·mol-1 indicated that the adsorption process is endothermic and chemical adsorption in nature. Negative changes in free energy(△G)showed that the adsorption is a spontaneous process. Positive values of△S suggested increased randomness at the solid-solution interface during the adsorption of As(Ⅲ)from aqueous solution by Cu2+-modified activated carbon.
