文章摘要
莫官海,曾涛涛.硝酸改性污泥基生物炭除U(Ⅵ)效果及机理分析[J].精细化工,2021,38(2):0
硝酸改性污泥基生物炭除U(Ⅵ)效果及机理分析
The U(Ⅵ) removal efficiency and mechanism by acidified sewage sludge-derived biochar
投稿时间:2020-07-08  修订日期:2020-09-07
DOI:
中文关键词: 酸化  污泥基生物炭  放射性废水  U(Ⅵ)  机理
英文关键词: acidification  sewage sludge-derived biochar  radioactive wastewater  U(Ⅵ)  mechanism
基金项目:湖南省教育厅创新平台开放基金项目(19K081)
作者单位E-mail
莫官海 南华大学 1269683703@qq.com 
曾涛涛 南华大学 biowater@126.com 
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中文摘要:
      以城市污泥为原料制备出污泥基生物炭,并通过硝酸改性得到硝酸改性污泥基生物炭(SSB-AO),探究了SSB-AO投加量、溶液初始pH、离子强度、吸附时间、U(Ⅵ)初始质量浓度以及吸附温度等对SSB-AO去除U(Ⅵ)的影响,通过SEM-EDS、FTIR及XPS分析SSB-AO对U(Ⅵ)的去除机理。结果表明:SSB-AO对U(Ⅵ)的吸附符合拟二级动力学模型,吸附过程以化学吸附为主;等温吸附过程符合Langmuir模型。在30 ℃、NaNO3浓度为0.01 mol/L、吸附时间300 min、初始pH=6、U(Ⅵ)初始质量浓度为10~100 mg/L及SSB-AO投加量为0.6 g/L的条件下,SSB-AO去除U(Ⅵ)的理论最大吸附量为80.34 mg/g;通过5次吸附-解吸实验,其吸附率保持在88%以上,说明SSB-AO具有良好的重复使用性;SSB-AO去除U(Ⅵ)的机理为内表面络合作用、静电作用以及离子交换。研究显示硝酸处理污泥基生物炭能有效地提高其对U(Ⅵ)的吸附能力,为含U(Ⅵ)废水处理提供借鉴。
英文摘要:
      The sewage sludge-derived biochar was prepared from sewage sludge and then modified by nitric acid to obtain acidified sewage sludge-derived biochar (SSB-AO). The effects of SSB-AO dosage, initial pH of solution, coexisting ions concentrations, adsorption time, initial concentration of U(Ⅵ) and adsorption temperature on the removal of U(Ⅵ) by SSB-AO were investigated. The removal mechanism was analyzed by SEM-EDS, FTIR and XPS. The results show that the adsorption of U(Ⅵ) by SSB-AO is in accordance with the quasi second-order kinetic model, which indicate that the adsorption is mainly chemical adsorption process. The isotherm adsorption process is according with Langmuir model. Under the conditions of 30 ℃, 0.01 mol/L NaNO3, adsorption time of 300 min,initial pH of 6, initial uranium concentrations of 10 to 100 mg/L and dosage of 0.6 g/L, the theoretical maximum adsorption capacity is 80.34 mg/g. The adsorption efficiency of SSB-AO is more than 88% after five adsorption desorption tests, which shows that SSB-AO has nice circulation ability. The mechanism of U(Ⅵ) removal by SSB-AO include inner surface complexation, electrostatic adsorption and ion exchange. This study shows that sewage sludge-derived biochar, after modification by nitric acid, can effectively improve U(Ⅵ) adsorption capacity, which provides a reference for U(Ⅵ) containing wastewater treatment.
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