naa a22 4500 510750028 CHVBK 20180411083101.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11270-013-1610-5 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1610-5 Sorption of As(V) by Aluminum-Modified Crop Straw-Derived Biochars [Elektronische Daten] [Wei Qian, An-zhen Zhao, Ren-kou Xu] Biochars derived from the straws of rice, soybean, and peanut were prepared and modified with aluminum [Al(III)]. These modifications shifted zeta potential-pH curves of the biochars in a positive-value direction and changed surface charge of biochars from negative to positive under acidic conditions. The isoelectric points for 0.6M Al(III)-modified rice, soybean, and peanut straw biochars were 8.0, 7.8, and 7.5, respectively. Electrostatic attraction of the positively charged surfaces on Al(III)-modified biochars to arsenate [As(V)] enhanced its sorption. The sorption of As(V) by these Al(III)-modified biochars was investigated in batch experiments. Al(III)-modified biochars had greater sorption capacity under acidic conditions compared with corresponding unmodified biochars. While unmodified biochars sorbed negligible amounts of As(V), their Al(III)-modified forms sorbed 445-667mmolkg−1 at pH5.0, which were predicted by the Langmuir equation. Modifications with 0.3M Al3+ improved sorption capacity of As(V) on soybean straw biochar to 445mmolkg−1, which was further increased by 50% after modification with 0.6M Al3+. These As(V) sorption capacities of biochars modified with 0.6M Al3+ were larger than those of Fe/Al oxides determined at the same pH, which were < 500mmolkg−1. Thus, biochars modified with 0.6M Al3+ could substitute Fe/Al oxides used for water purification. However, the sorption of As(V) by the Al(III)-modified biochars increased with decreasing suspension pH. Thus, As(V) removal by Al(III)-modified biochars is suggested to be conducted under acidic conditions, but at pH > 4.0. Springer Science+Business Media Dordrecht, 2013 Al(III)-modified biochar nationallicence Sorption of arsenate nationallicence Crop straw nationallicence Zeta potential nationallicence Qian Wei State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut Zhao An-zhen State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut Xu Ren-kou State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut Water, Air, & Soil Pollution Springer Netherlands 224/7(2013-07-01), 1-8 0049-6979 224:7<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1610-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1610-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qian Wei State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut NATIONALLICENCE 700 1- Zhao An-zhen State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut NATIONALLICENCE 700 1- Xu Ren-kou State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/7(2013-07-01), 1-8 0049-6979 224:7<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer