Investigating the adsorption behavior and quantitative contribution of Pb2+ adsorption mechanisms on biochars by different feedstocks from a fluidized bed pyrolysis system

Lingqin Liu, Yaji Huang, Yuanhua Meng, Jianhua Cao, Huajun Hu, Yinhai Su, Lu Dong, Shengnian Tao, Roger Ruan

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Abstract

The aim of this study was to examine the qualitative and quantitative analysis of Pb2+ adsorption mechanisms performed with biochars derived from rice straw (RSBs), rice husk (RHBs) and saw dust (SDBs) at several pyrolysis temperatures (400-600 °C) in a fluidized bed system. Adsorption isotherms, kinetics, and desorption analysis were determined, and biochars were analyzed by X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope with Energy Dispersive Spectrometer (SEM-EDS) and Boehm titration method. The effect of minerals on Pb2+ adsorption, including precipitation and cation exchange, revealed increasing contribution of precipitation from a range of 4.13%–38.83% to a range of 34.08%–79.94% and decreasing effect of cation exchange from a range of 50.17%–69.75% to a range of 9.57%–43.47% with increasing pyrolysis temperature. However, it remained the dominant adsorption mechanism of all biochars (accounted for 69.49–89.52%). Especially, RSBs with quite high maximum adsorption capacity (qm) values (116-127.57 mg[rad]g−1) were mainly due to precipitation mechanism of Pb2+ adsorption, which exhibited better adsorption capacities than RHBs (25.15–30.40 mg[rad]g−1) and SDBs (21.81–24.05 mg[rad]g−1). Only with the fluidized bed shown in this study, 2.00t RSBs could be produced and the corresponding Pb2+ adsorption may reach 255.50kg per year depending on its maximum adsorption capacity under 500 °C pyrolysis temperature. The results suggest that RSBs produced in a fluidized bed reactor is a promising, cost-effective, engineered biochar for application of Pb2+ remediation in aqueous solutions.

Original languageEnglish (US)
Article number109609
JournalEnvironmental Research
Volume187
DOIs
StatePublished - Aug 2020

Bibliographical note

Funding Information:
The authors are grateful for the Financial supports from National Key R&D Program of China (No.2018YFB0605102), National Nature Science Foundation of China (No.51676040), Natural Science Foundation of Jiangsu Province (No.BK20181281), Jiangsu Province Science and Technology Support Project (No. BE2013705), Scientific Innovation Research Program of College Graduate in Jiangsu Province (No. KYCX19_0075), the Scientific Research Foundation of the Graduate School of Southeast University (No.YBJJ1809), as well as the Financial Support from the Program of China Scholarships Council (No. 201806090030).

Funding Information:
The authors are grateful for the Financial supports from National Key R&D Program of China (No. 2018YFB0605102 ), National Nature Science Foundation of China (No. 51676040 ), Natural Science Foundation of Jiangsu Province (No. BK20181281 ), Jiangsu Province Science and Technology Support Project (No. BE2013705 ), Scientific Innovation Research Program of College Graduate in Jiangsu Province (No. KYCX19_0075 ), the Scientific Research Foundation of the Graduate School of Southeast University (No. YBJJ1809 ), as well as the Financial Support from the Program of China Scholarships Council (No. 201806090030 ).

Publisher Copyright:
© 2020 Elsevier Inc.

Keywords

  • Adsorption mechanisms
  • Biochar
  • Fluidized bed pyrolysis
  • Lead
  • Quantitative contribution

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't

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