柱狀活性炭對鎳離子吸附量受pH影響很大

  柱(zhu)(zhu)(zhu)狀活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭對(dui)(dui)鎳(nie)(nie)(nie)離(li)(li)子(zi)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)量(liang)受pH影響(xiang)很大，使(shi)(shi)用(yong)酸或堿改變溶(rong)液的pH進(jin)行脫附(fu)(fu)(fu)(fu)，實(shi)現柱(zhu)(zhu)(zhu)狀活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭再(zai)生。用(yong)HCl溶(rong)液浸漬吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)飽(bao)(bao)和(he)活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭時，酸性(xing)(xing)(xing)(xing)環境破(po)壞吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)平衡，鎳(nie)(nie)(nie)離(li)(li)子(zi)從活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭表(biao)面脫附(fu)(fu)(fu)(fu)，活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭恢復吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)性(xing)(xing)(xing)(xing)能(neng)(neng)。Ni2+的洗脫率隨(sui)著HCl溶(rong)液的質量(liang)濃(nong)度(du)增加而增加，鹽(yan)酸質量(liang)濃(nong)度(du)達(da)到0．1mol/L時，鎳(nie)(nie)(nie)離(li)(li)子(zi)的洗出率已(yi)經(jing)(jing)達(da)到91．7%，鹽(yan)酸質量(liang)濃(nong)度(du)繼續增大，鎳(nie)(nie)(nie)離(li)(li)子(zi)的洗脫率略微升高。柱(zhu)(zhu)(zhu)狀活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭再(zai)生實(shi)驗選擇HCl溶(rong)液為0．1mol/L。HCl溶(rong)液再(zai)生活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭，活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)的鎳(nie)(nie)(nie)離(li)(li)子(zi)被洗脫下來，大量(liang)氫離(li)(li)子(zi)與活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭表(biao)面的—CHO，—OH，—COOH，—C==O等(deng)有效活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)中心結(jie)合(he)，占(zhan)據了活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭上與鎳(nie)(nie)(nie)離(li)(li)子(zi)的結(jie)合(he)位(wei)置，降低了再(zai)生柱(zhu)(zhu)(zhu)狀活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭對(dui)(dui)鎳(nie)(nie)(nie)離(li)(li)子(zi)的吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)量(liang)。因(yin)此，飽(bao)(bao)和(he)柱(zhu)(zhu)(zhu)狀活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭在(zai)酸洗后(hou)(hou)再(zai)用(yong)堿洗，將(jiang)H+置換出來，使(shi)(shi)活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭恢復吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)能(neng)(neng)力。活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭經(jing)(jing)多(duo)次飽(bao)(bao)和(he)吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)和(he)酸堿再(zai)生后(hou)(hou)，其吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)性(xing)(xing)(xing)(xing)能(neng)(neng)仍(reng)與新(xin)活(huo)(huo)(huo)(huo)(huo)性(xing)(xing)(xing)(xing)炭吸(xi)(xi)(xi)(xi)附(fu)(fu)(fu)(fu)性(xing)(xing)(xing)(xing)能(neng)(neng)相(xiang)近，能(neng)(neng)多(duo)次重復利(li)用(yong)，并且洗脫液中富集(ji)的鎳(nie)(nie)(nie)離(li)(li)子(zi)可以實(shi)現資源回收。