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Ó¢ÎÄ£ºSEM results showed that there was a large amount of Cu-S micro-nano complex on the surface of AFSS (adsorbent), which could reduce Cr (VI) in solution to Cr (III). Cr (III) reacts with the mercapto groups in the adsorbent to achieve the adsorption of chromium ions on the adsorbent. At lower pH, the surface of  AFSS will be surrounded by high quantities of hydronium ions (H3O+)¡­¡­¡­¡­

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ÆßÔÂlove: ½ð±Ò+226, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2017-04-06 11:35:49
ÖÐÎÄ£ºÓÃɨÃèµç¾µ¹Û²ì·¢ÏÖ£¬AFSS£¨Îü¸½¼Á£©±íÃæÓдóÁ¿µÄCCS£¬Ëü¾ßÓл¹Ô­ÐÔ£¬¿ÉÄÜ»áʹÈÜÒºÖÐµÄ Cr(VI)»¹Ô­³ÉCr(III)¡£Cr(III£©»áÓëÎü¸½¼ÁÖеĹÙÄÜÍÅ£¨ÈçÛÏ»ù£©·¢ÉúÀë×Ó½»»»£¬´ïµ½¸õÀë×ÓÎü¸½ÔÚÎü¸½¼ÁÉϵÄÄ¿µÄ¡£pH½ÏµÍʱ£¬AFSS±íÃæ°üΧ´óÁ¿µÄÇâÀë×Ó£¬ÕâÓÐÀûÓÚ»¹Ô­·´Ó¦µÄ½øÐС£Ëæ×ÅpHÉý¸ß£¬ÇâÀë×ÓŨ¶È½µµÍ£¬»¹Ô­·´Ó¦¼õÈõ£¬ Cr(VI)Îü¸½ÌåϵÖÐ Cr(VI)»¹Ô­³ÉCr(III)µÄÊýÄ¿¼õÉÙ£¬Îü¸½¼ÁÎü¸½Cr(VI)µÄÄÜÁ¦Ï½µ¡£´ËÍ⣬ÇâÀë×ÓŨ¶È¹ý¸ßÒ²»áÓëÈÜÒºÖвúÉúµÄCr(III)¾ºÕùÎü¸½¼ÁµÄ·´Ó¦»îÐÔλµã£¬ÕâͬÑùÒ²»áÔÚÒ»¶¨³Ì¶ÈÉÏ×è°­Cr(VI)»¹Ô­³ÉCr(III)¡£Òò´Ë£¬Îü¸½¼Á¶ÔCr(VI)µÄ×î¼ÑÎü¸½pHΪ4.0¡£

It can be seen from the SEM results that there were many CCS on the surface of AFSS (adsorbent), which may reduce the Cr(VI) in the solution into Cr(III). At the meantime, Cr (III) may react with the mercapto groups in the adsorbent to achieve the adsorption of chromium ions on the adsorbent. As the pH value increases, and the concentration of H+ decreases, the reduction reaction weakens. Consequently, the amount of the Cr(VI) reduced into Cr(III) decreases, and the capability of the adsorbent for adsorbing Cr(VI) decreases. In addition, if the concentration of H+ is excessively high, the H+ will compete with the Cr(III) formed in the solution for the reactive sites on the adsorbent, which hinders the reduction of Cr(VI) into Cr£¨III£© to some extent. As a result, the optimal pH value for the adsorbent for adsorbing Cr(VI) is 4.0.
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