磷酸改性油茶壳活性炭吸附水中甲醛的研究

Study on the adsorption of formaldehyde in water by modified activated carbon from oil tea camellia shell with phosphoric acid

以磷酸为活化剂,改性制备了油茶壳活性炭,对水体中的甲醛进行吸附,探讨了活化温度、活化剂浓度、pH、吸附时间、甲醛初始浓度对吸附效果的影响,并进行了吸附热力学和动力学分析。结果表明,活化温度550℃,磷酸质量浓度40%时,制备的油茶壳活性炭吸附甲醛的效果最佳,180 min左右时达到平衡,符合准二级动力学模型,吸附过程符合Langmuir等温吸附模型,对甲醛的实际最大吸附量可达到4.78 mg/g。在最适的实验条件下,0.1 g的磷酸改性油茶壳活性炭,对初始质量浓度为5 mg/L的甲醛,去除率可达92.1%,吸附效果良好。

The study on phosphoric acid as activating agent,the camellia shell activated carbon were prepared,which were used for preparation of camellia oleifera shell activated carbon on formaldehyde in water were studied,to explore the activation temperature,concentration,pH,adsorption time,initial concentration of formaldehyde on the adsorption effect. And analyzed the adsorption thermodynamics and kinetics. The results show that the activation temperature of 550 ℃,phosphate concentration was 40 %,camellia shell activated carbon adsorption of formaldehyde by the best adsorption process reached equilibrium in 180 min,with the pseudo-two-order kinetics model. The adsorption process accords with the Langmuir adsorption isotherm model,the maximum adsorption capacity of formaldehyde can reach 4. 78 mg/g.In the experimental conditions,0. 1 g phosphate modified camellia shell activated carbon on the initial concentration of 5 mg/L the formaldehyde removal rate can reach 92. 1 %,the adsorption effect is good.