Effect of pyrolysis temperatures and times on the adsorption of cadmium onto orange peel derived biochar.
Identifieur interne : 000239 ( Main/Exploration ); précédent : 000238; suivant : 000240Effect of pyrolysis temperatures and times on the adsorption of cadmium onto orange peel derived biochar.
Auteurs : Hai Nguyen Tran [Taïwan] ; Sheng-Jie You [Taïwan] ; Huan-Ping Chao [Taïwan]Source :
- Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA [ 1096-3669 ] ; 2016.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Cadmium, Charcoal, Water Pollutants, Chemical.
- chemistry : Citrus sinensis, Fruit.
- methods : Waste Management.
- Adsorption, Hot Temperature, Kinetics.
Abstract
The mechanism and capacity of adsorption of cadmium (Cd) on orange peel (OP)-derived biochar at various pyrolysis temperatures (400, 500, 600, 700 and 800°C) and heating times (2 and 6 h) were investigated. Biochar was characterized using proximate analysis, point of zero charge (PZC) analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Equilibrium and kinetic experiments of Cd adsorption on biochar were performed. The results indicated that the pH value at PZC of biochar approached 9.5. Equilibrium can be reached rapidly (within 1 min) in kinetic experiments and a removal rate of 80.6-96.9% can be generated. The results fitted the pseudo-second-order model closely. The adsorption capacity was estimated using the Langmuir model. The adsorption capacity of Cd on biochar was independent of the pyrolysis temperature and heating time (p>0.01). The maximum adsorption capacity of Cd was 114.69 (mg g(-1)). The adsorption of Cd on biochar was regarded as chemisorption. The primary adsorption mechanisms were regarded as Cπ-cation interactions and surface precipitation. Cadmium can react with calcite to form the precipitation of (Ca,Cd)CO3 on the surface of biochar. The OP-derived biochar can be considered a favourable alternative and a new green adsorbent for removing Cd(2+) ions from an aqueous solution.
DOI: 10.1177/0734242X15615698
PubMed: 26608900
Affiliations:
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Le document en format XML
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You</name><affiliation wicri:level="1"><nlm:affiliation>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan.</nlm:affiliation><country xml:lang="fr">Taïwan</country><wicri:regionArea>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320</wicri:regionArea><wicri:noRegion>Chungli 320</wicri:noRegion></affiliation></author><author><name sortKey="Chao, Huan Ping" sort="Chao, Huan Ping" uniqKey="Chao H" first="Huan-Ping" last="Chao">Huan-Ping Chao</name><affiliation wicri:level="1"><nlm:affiliation>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan sjyou@cycu.edu.tw hpchao@cycu.edu.tw.</nlm:affiliation><country wicri:rule="url">Taïwan</country><wicri:regionArea>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320</wicri:regionArea><wicri:noRegion>Chungli 320</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno 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wicri:level="1"><nlm:affiliation>Department of Civil Engineering, Chung Yuan Christian University, Chungli 320, Taiwan Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan.</nlm:affiliation><country xml:lang="fr">Taïwan</country><wicri:regionArea>Department of Civil Engineering, Chung Yuan Christian University, Chungli 320, Taiwan Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320</wicri:regionArea><wicri:noRegion>Chungli 320</wicri:noRegion></affiliation></author><author><name sortKey="You, Sheng Jie" sort="You, Sheng Jie" uniqKey="You S" first="Sheng-Jie" last="You">Sheng-Jie You</name><affiliation wicri:level="1"><nlm:affiliation>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan.</nlm:affiliation><country xml:lang="fr">Taïwan</country><wicri:regionArea>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320</wicri:regionArea><wicri:noRegion>Chungli 320</wicri:noRegion></affiliation></author><author><name sortKey="Chao, Huan Ping" sort="Chao, Huan Ping" uniqKey="Chao H" first="Huan-Ping" last="Chao">Huan-Ping Chao</name><affiliation wicri:level="1"><nlm:affiliation>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan sjyou@cycu.edu.tw hpchao@cycu.edu.tw.</nlm:affiliation><country wicri:rule="url">Taïwan</country><wicri:regionArea>Department of Environmental Engineering, Chung Yuan Christian University, Chungli 320</wicri:regionArea><wicri:noRegion>Chungli 320</wicri:noRegion></affiliation></author></analytic><series><title level="j">Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA</title><idno type="eISSN">1096-3669</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adsorption</term><term>Cadmium (chemistry)</term><term>Charcoal (chemistry)</term><term>Citrus sinensis (chemistry)</term><term>Fruit (chemistry)</term><term>Hot Temperature</term><term>Kinetics</term><term>Waste Management (methods)</term><term>Water Pollutants, Chemical (chemistry)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cadmium</term><term>Charcoal</term><term>Water Pollutants, Chemical</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Citrus sinensis</term><term>Fruit</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Waste Management</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adsorption</term><term>Hot Temperature</term><term>Kinetics</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The mechanism and capacity of adsorption of cadmium (Cd) on orange peel (OP)-derived biochar at various pyrolysis temperatures (400, 500, 600, 700 and 800°C) and heating times (2 and 6 h) were investigated. Biochar was characterized using proximate analysis, point of zero charge (PZC) analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Equilibrium and kinetic experiments of Cd adsorption on biochar were performed. The results indicated that the pH value at PZC of biochar approached 9.5. Equilibrium can be reached rapidly (within 1 min) in kinetic experiments and a removal rate of 80.6-96.9% can be generated. The results fitted the pseudo-second-order model closely. The adsorption capacity was estimated using the Langmuir model. The adsorption capacity of Cd on biochar was independent of the pyrolysis temperature and heating time (p>0.01). The maximum adsorption capacity of Cd was 114.69 (mg g(-1)). The adsorption of Cd on biochar was regarded as chemisorption. The primary adsorption mechanisms were regarded as Cπ-cation interactions and surface precipitation. Cadmium can react with calcite to form the precipitation of (Ca,Cd)CO3 on the surface of biochar. The OP-derived biochar can be considered a favourable alternative and a new green adsorbent for removing Cd(2+) ions from an aqueous solution.</div></front></TEI><affiliations><list><country><li>Taïwan</li></country></list><tree><country name="Taïwan"><noRegion><name sortKey="Tran, Hai Nguyen" sort="Tran, Hai Nguyen" uniqKey="Tran H" first="Hai Nguyen" last="Tran">Hai Nguyen Tran</name></noRegion><name sortKey="Chao, Huan Ping" sort="Chao, Huan Ping" uniqKey="Chao H" first="Huan-Ping" last="Chao">Huan-Ping Chao</name><name sortKey="You, Sheng Jie" sort="You, Sheng Jie" uniqKey="You S" first="Sheng-Jie" last="You">Sheng-Jie You</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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