非活性黑根霉菌对废水中重金属离子的吸附

为探讨发酵工业中废弃的菌丝体黑根霉菌（Ｒｈｉｚｏｐｕｓｎｉｇｒｉｃａｎｓ）对水中重金属离子的吸附特性，考察ｐＨ、浓度、共存离子等因素对吸附能力的影响，进行了实验室吸附试验，绘制出吸附等温线，并由Ｌａｎｇｍｕｉｒ曲线和Ｆｒｅｕｎｄｌｉｃｈ曲线求出相应参数。对化学改性前后的黑根霉进行了吸附对比。初步分析了吸附机理。结果表明，黑根霉在ｐＨ＝３—６．５范围内，对Ｐｂ２＋、Ｃｕ２＋、Ｍｎ２＋、Ｃｒ（ＶＩ）几种主要重金属离子都有吸附作用，其中吸附Ｐｂ２＋能力最高，饱和吸附量可达８８ｍｇ／ｇ。经化学改性的黑根霉可不同程度地提高吸附能力。用０．５ｍｏｌ／ＬＨＣＩ和ＮａｏＨ可以洗脱和再生。

Biosorption of Heave Metals by Rhizopus Nigricans

Adsorption properties of the nonliving Rhizopus nigricans for metal ions were studied.The effects of pH,concentration and co-ions on the adsorption efficiency were examined.From the isotherms,the adsorption equilibrium constant (b)and the maximum adsorption capacity(q_∞)in the Langmuir equation and the experimental constant(K)and (l/n )in Freundlich equation were determined.Adsorption properties of treated and untreated R.nigricans were compared. The results show that the optimum pH value was between 3 and 6.5,the maximum pb²⁺ uptake capacity was 88mg/g. R.nigricans can be eluted and regenerated with a 0.5mol/L HCl solution and a NaOH solution.