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以罗望子胶原粉(TKP)为基料,氯乙酸钠(SMCA)为羧甲基醚化剂,环氧氯丙烷(ECH)为交联剂制备了取代度(DS)分别为0.42,0.64和0.88的3种交联羧甲基罗望子胶(CCMTKP),探究其对水溶液中Pb2+的吸附行为。结果表明,适宜吸附的pH值范围为2~6;吸附剂较佳用量为0.5%;3种CCMTKP对Pb2+的吸附在15min内达到平衡,遵从二级动力学方程;吸附符合Langmuir等温吸附模型,CCMTKP对Pb2+的最大吸附量为131.58mg/g;再生后的CCMTKP吸附性能良好,脱附百分率高,有望作为Pb2+的吸附剂使用。
Based on TKP, SMCA was prepared as carboxymethyl etherification agent and epichlorohydrin (ECH) was used as crosslinking agent to prepare DSMs with the DS of 0.42, 0.64 and 0.88 of three cross-linked carboxymethyl tamarind gum (CCMTKP), to explore the adsorption of Pb2 + in aqueous solution behavior. The results showed that the optimal pH value ranged from 2 to 6 and the optimal amount of adsorbent was 0.5%. The adsorption of Pb2 + by 3 kinds of CCMTKP reached the equilibrium within 15 min, followed the second order kinetic equation. The adsorption was in accordance with Langmuir isothermal adsorption model, The maximum adsorption capacity of CCMTKP to Pb2 + was 131.58mg / g. The regenerated CCMTKP showed good adsorption capacity and high desorption rate, which could be expected to be used as an adsorbent for Pb2 +.