Use of thermally modified waste concrete powder for removal of Pb (II) from wastewater: Effects and mechanism

doi:10.1016/j.envpol.2021.116776

	Use of thermally modified waste concrete powder for removal of Pb (II) from wastewater: Effects and mechanism
	Ma, Zihan 1,4; Xue, Runze 4; Li, Jiang-shan 1,2; Zhao, Yaqin 4; Xue, Qiang 1,2; Chen, Zhen 1; Wang, Qiming 3; Poon, Chi Sun 2,3
刊名	ENVIRONMENTAL POLLUTION
	2021-05-15
卷号	277 页码:15
关键词	Waste concrete powder (WCP) Lead Adsorption Modification
ISSN号	0269-7491
DOI	10.1016/j.envpol.2021.116776
英文摘要	Exploring effective uses of waste concrete powder (WCP), produced from recycling of construction & demolition waste is beneficial to the environment and sustainable development. In this study, WCP was first treated thermally to enhance the ability to remove Pb (II) from aqueous solutions. The experimental results revealed that the thermal treatment could enhance adsorption capacity due to modification of calcium bonding and pore structure of WCP. Preparation parameters such as temperature, particle size, and water-cement ratio were investigated to obtain the optimal operational conditions. Batch adsorption experiments were performed to explore influence factors of pH (1.00-6.00), ionic strength (0.05-2 mol/L), dosage (2-50 g/L), and temperature (25-45 degrees C). The pseudo-second-order kinetics model could adequately describe the adsorption process, and the Langmuir model was capable to predict the isotherm data well in the low concentration region (C-0 < 500 mg/L). The maximum uptake capacity for Pb (II) calculated by Langmuir model at 25, 35 and 45 degrees C were 46.02, 38.58 and 30.01 mg/g respectively, and the removal rate of Pb (II) was 92.96% at a dosage of 50 g/L (C-0 = 1000 mg/L). Precipitation, ion exchange, and surface complexation were identified to be the main mechanisms of Pb (II) adsorption through microscopic investigation by SEM-EDX, XRD, FTIR, XPS, and BET inspections. The study confirms that the WCP after thermal modification, can be selected as a promising adsorbent for the high performance and eco-friendliness. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program[2019YFC1804002] ; National Science Fund for Distinguished Young Scholars[51625903] ; National Natural Science Foundation of China/Hong Kong Research Grants Council, University Grants Committee Joint Research Scheme[51861165104] ; Special Fund for Basic Research on Science Instruments of the National Science Foundation of China[51827814] ; CAS Pioneer Hundred Talents Program in China ; Postgraduate Research & Practice Innovation Program of Jiangsu Province[SJCX20_0818] ; Assistance Program for Future Outstanding Talents of China University of Mining and Technology[2020WLJCRCZL055] ; Natural Science Foundation of Jiangsu Province[BK20160241]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000637737100033
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/26010]
专题	中科院武汉岩土力学所
通讯作者	Li, Jiang-shan
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.IRSM CAS HK PolyU Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 3.Hong Kong Polytech Univ, Hong Kong Univ, Dept Civil & Environm Engn, Kowloon,Hung Hom, Hong Kong, Peoples R China 4.China Univ Min & Technol, Sch Environm Sci & Spatial Informat, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Ma, Zihan,Xue, Runze,Li, Jiang-shan,et al. Use of thermally modified waste concrete powder for removal of Pb (II) from wastewater: Effects and mechanism[J]. ENVIRONMENTAL POLLUTION,2021,277:15.
APA	Ma, Zihan.,Xue, Runze.,Li, Jiang-shan.,Zhao, Yaqin.,Xue, Qiang.,...&Poon, Chi Sun.(2021).Use of thermally modified waste concrete powder for removal of Pb (II) from wastewater: Effects and mechanism.ENVIRONMENTAL POLLUTION,277,15.
MLA	Ma, Zihan,et al."Use of thermally modified waste concrete powder for removal of Pb (II) from wastewater: Effects and mechanism".ENVIRONMENTAL POLLUTION 277(2021):15.