Journal article
Unraveling sorption of lead in aqueous solutions by chemically modified biochar derived from coconut fiber: A microscopic and spectroscopic investigation
The Science of the total environment, Vol.576, pp.766-774
15/01/2017
PMID: 27810761
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Abstract
In this study, we examined the efficacy of nine different types of coconut-fiber derived biochars (CFBs), prepared at different temperatures and chemically modified with ammonia, hydrogen peroxide and nitric acid, to remove lead. (Pb2+) from aqueous solutions. Langmuir-q(m) values of the biochars pyrolyzed at 300 degrees C and modified with ammonia and nitric acid increased from 49.5 to 105.5 and 85.2 mg g(-1), respectively, compared to control (unmodified), whereas hydrogen peroxide treatment had no effect. The maximum amount of Pb adsorbed on biochars was in the order of CFB-700 > MCFB-300-NH3. H2O > CFB-500 > MCFB-300-HNO3 > CFB-300. X-ray absorption fine structure (XAFS) spectroscopy results revealed that Pb-montmorillonite, Pb(C2H3O2)(2), PbSO4, Pb-Al2O3 and Pb-3(PO4)(2) were the five most important Pb species observed in Pb-loaded biochars, and as such, favoring Pb immobilization in aqueous solutions. Overall, the sorption capacity of CFBs pyrolyzed at 300 degrees C substantially increased for Pb2+ with ammonia and nitric acid modification. However, these chemical modifications did not improve the sorption of Pb on CFBs pyrolyzed at temperatures >= 500 degrees C, thereby highlighting a temperature dependent response of chemically modified biochars to Pb sorption in this study. (C) 2016 Elsevier B.V. All rights reserved.
Details
- Title
- Unraveling sorption of lead in aqueous solutions by chemically modified biochar derived from coconut fiber: A microscopic and spectroscopic investigation
- Creators
- Weidong Wu - Hainan UniversityJianhong Li - Hainan UniversityTian Lan - Hainan Univ, Key Lab Protect & Dev Utilizat Trop Crop Germplas, Minist Educ, Haikou 570228, Hainan, Peoples R ChinaKarin Muller - New Zealand Inst Plant & Food Res Ltd, Ruakura Res Ctr, Private Bag 3123, Hamilton, New ZealandNabeel Khan Niazi - University of Agriculture FaisalabadXin Chen - Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R ChinaSong Xu - Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R ChinaLirong Zheng - Chinese Academy of SciencesYingchao Chu - Hainan Univ, Key Lab Protect & Dev Utilizat Trop Crop Germplas, Minist Educ, Haikou 570228, Hainan, Peoples R ChinaJianwu Li - Zhejiang A & F UniversityGuodong YuanHailong Wang - Foshan University
- Publication Details
- The Science of the total environment, Vol.576, pp.766-774
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- 2014607101003 / Special Funding for the Introduced Innovative RAMP;D Team of Dongguan 21467007; 21577131; 41271337; 41301228 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC) LZ15D010001 / Key Program of the Zhejiang Provincial Natural Science Foundation, China; National Natural Science Foundation of China (NSFC)
- Identifiers
- 991013039385202368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article