核桃壳基活性炭的热性能及其Cr(Ⅵ)吸附特性

Thermal Analysis and Treatment of Cr(Ⅵ)from Wastewater by Walnut Shell Activated Carbon

用农业废弃物核桃壳制备的活性炭(WSAC)吸附处理六价铬,可达到以废治废效果。对核桃壳基活性炭(WSAC)表面结构进行红外光谱表征,测定其热重、差热等参数的变化,分析其热性质以及热稳定性。考察影响吸附热力学的参数,包括含Cr(Ⅵ)模拟废液的pH、Cr(Ⅵ)初始质量浓度以及WSAC投加量对Cr(Ⅵ)吸附去除率的影响。结果显示,影响WSAC吸附六价铬参数的最优值分别为:Cr(Ⅵ)初始浓度为4 mg/L、pH=3.95、WSAC投加量为2 mg/mL。Cr(Ⅵ)去除率影响因素分析表明,WSAC投加量对Cr(Ⅵ)去除率的影响最大,其次为溶液pH及初始浓度。

Walnut shell activated carbon(WSAC)adsorbed Cr(Ⅵ)from wastewater to attain the waste control by the waste.IR Spectroscopy was characterized,TG and DTA was measured and analyzed for WSAC.The effect of pH of Cr(Ⅵ)containing water,Cr(Ⅵ)initial concentration and dosage of WSAC to the efficiency of chromium treatment was investigated,results show that the optimal value of initial concentration,pH and the dosage of WSAC for the adsorption treatment is 4 mg/L,3.95,2 mg/mL respectively.Analysis shows that the dosage of WSAC is the essential factor for the Cr(Ⅵ)removing,and pH and Cr(Ⅵ)initial concentration are ranked in behind.