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Jin H.,Jiangsu Academy of Agricultural Sciences | Jin H.,Key Laboratory of Agro Environment in Downstream of Yangtze Plain | Jin H.,Texas A&M University | Hanif M.U.,Texas A&M University | And 8 more authors.
Journal of Environmental Chemical Engineering | Year: 2016

Biochar produced from waste products is being considered as an alternative adsorbent for removal of aqueous heavy metals. In this work, experimental and modeling investigations were conducted to examine the effect of biochars pyrolyzed from anaerobically digested algae-dairy-manure slurry (DAS) on removing aqueous Cu(II) before and after activated by 2 M KOH solution. Results showed that the highest adsorption capacity of pristine biochars was 21.12 mg/g. The Elovich model and Freundlich adsorption isotherm model can preferably describe the adsorption process, which indicated that Cu(II) was chemisorbed on heterogeneous surface of DAS-derived biochars. The activated biochar showed enhanced Cu(II) adsorption ability with an adsorption capacity of 50.71 mg/g, which was more than 3.36 times of pristine biochars. Increase of surface area and changes of porous texture, especially the functional groups on the surface of activated biochars are the major contributors to its more efficient adsorption of Cu(II). © 2015 Elsevier Ltd. All rights reserved. Source


Jin H.,Jiangsu Academy of Agricultural Sciences | Jin H.,Key Laboratory of Agro Environment in Downstream of Yangtze Plain | Jin H.,Texas A&M University | Capareda S.,Texas A&M University | And 7 more authors.
Bioresource Technology | Year: 2014

Biochar converted from waste products is being considered as an alternative adsorbent for removal of aqueous heavy metal(loid)s. In this work, experimental and modeling investigations were conducted to examine the effect of biochars pyrolytically produced from municipal solid wastes on removing aqueous As(V) before and after activated by 2. M KOH solution. Results showed that the highest adsorption capacity of pristine biochars was 24.49. mg/g. The pseudo-second-order model and Langmuir adsorption isotherm model can preferably describe the adsorption process. The activated biochar showed enhanced As(V) adsorption ability with an adsorption capacity of 30.98. mg/g, which was more than 1.3. times of pristine biochars, and 2-10. times of modified biochars reported by other literatures. Increase of surface area and changes of porous texture, especially the functional groups on the surface of activated biochars are the major contributors to its more efficient adsorption of As(V). © 2014 Elsevier Ltd. Source


Jin H.,Jiangsu Academy of Agricultural Sciences | Jin H.,Texas A&M University | Jin H.,Key Laboratory of Agro Environment in Downstream of Yangtze Plain | Arazo R.O.,Texas A&M University | And 5 more authors.
Journal of Analytical and Applied Pyrolysis | Year: 2014

Pyrolysis residues produced from three particle sizes of sewage sludge using fluidized bed at 500 °C were subjected to toxicity characteristic leaching procedure (TCLP) and diethylenetriamine pentaacetic acid (DTPA) leaching tests to assess the potential release and bioavailability of heavy metals in their pyrolysis residues. Results showed that the smallest particle of sewage sludge produced the highest pyrolysis residue. Most functional characteristics of the pyrolysis residues were similar to those of sewage sludge itself, and some specific functional groups formed after fast pyrolysis. All heavy metals in feedstock sewage sludge were kept in pyrolysis residue except As, and their contents were enriched 2.5-3.5 times in pyrolysis residues. Pyrolysis residues obtained from larger particles of sewage sludge would cause excessive level of Cu and Zn. Although the fast pyrolysis significantly suppressed heavy metals leaching from residues, the leaching pattern of heavy metals was different between pyrolysis residues produced from the three particle sizes of sewage sludge. Specifically, Cu, Zn and As in the pyrolysis residues from the larger particle of sewage sludge were easier to be leached to environment. However, the bioavailability of Cu was highest in the pyrolysis residue derived from the largest particle of sewage sludge; whereas that of Zn and As was highest in the pyrolysis residue derived from the smallest particle of sewage sludge. © 2014 Elsevier B.V. Source


Yang H.-Z.,Key Laboratory of Agro Environment in Downstream of Yangtze Plain | Yang H.-Z.,Jiangsu Academy of Agricultural Sciences | Feng Y.-F.,Key Laboratory of Agro Environment in Downstream of Yangtze Plain | Feng Y.-F.,Jiangsu Academy of Agricultural Sciences | And 5 more authors.
Journal of Ecology and Rural Environment | Year: 2013

Being a major agricultural country in the world, China produces hundreds of millions of tons of agriculture byproducts annually, of which, however, only approximately 60%, significantly lower than that in developed countries, are used. There is still much room for exploiting the resources of agro-based byproducts. A large volume of studies have been done focusing on recycling of agro-based byproducts. Using agricultural byproducts to produce low-cost bioadsorbents intended for wastewater treatment is one topic, and moreover a promising one, which will not only offer a new approach to the exploition of resources for agricultural byproducts, but also supply with a new kind of low-cost bioadsorbent for wastewater treatment. A review of the researches in this field is presented, introducing 3 ways to produce adsorbents with agricultural byproducts, i.e. crude agricultural-byproduct-based adsorbents, chemically modified adsorbents and physically modified adsorbents, summarizing problems faced in the researches and discussing prospects of future researches. Source

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