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Humic Acid Removal from Water with PAC-Al30: Effect of Calcium and Kaolin and the Action Mechanisms.
ACS Omega ( IF 3.7 ) Pub Date : 2020-07-02 , DOI: 10.1021/acsomega.0c00532 Zhen Wu 1, 2 , Xian Zhang 1, 2 , Jinglin Pang 2 , Xianming Zhang 2 , Juan Li 3 , Jiding Li 4 , Panyue Zhang 3
ACS Omega ( IF 3.7 ) Pub Date : 2020-07-02 , DOI: 10.1021/acsomega.0c00532 Zhen Wu 1, 2 , Xian Zhang 1, 2 , Jinglin Pang 2 , Xianming Zhang 2 , Juan Li 3 , Jiding Li 4 , Panyue Zhang 3
Affiliation
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Polyaluminum chloride with a dominant species of Al30 (PAC-Al30) was prepared in laboratory and used for humic acid (HA) removal from water. The action properties and mechanisms of PAC-Al30, HA, calcium, and kaolin were tested and discussed. The results showed that the existence of calcium or kaolin contributed to the HA removal when the PAC-Al30 dosage was deficient and had no obvious effect when the amount of PAC-Al30 was sufficient. When the PAC-Al30 dosage was 0.01 and 0.02 mmol/L, the HA removal rate was increased by 66.59 and 42.20%, respectively, with a calcium concentration of 2.0 mmol/L, or increased by 53.31 and 40.92%, respectively, with the kaolin particle concentration of 150 mg/L. Calcium could compress the double electrical layers or complex with HA to neutralize a part of the surface negative charge of HA, but could not make the water system reach its isoelectric point. The mechanisms of calcium and kaolin’s promoting coagulation effect were adsorption neutralization and collision aggregation respectively, but these actions were much weaker than that of PAC-Al30 with HA. The adsorption neutralization capacity of PAC-Al30 was calculated to be nearly 60 times than that of calcium, and the higher γ value of calcium modified by the Sips equation may indicate that the adsorption or neutralization sites of calcium on HA were pickier than PAC-Al30.
中文翻译：
用 PAC-Al30 去除水中的腐殖酸：钙和高岭土的影响及其作用机制。
在实验室制备了以Al 30为主的聚合氯化铝（PAC-Al 30 ），并用于去除水中的腐殖酸（HA）。测试并讨论了PAC-Al 30 、HA、钙和高岭土的作用性质和机制。结果表明，当PAC-Al 30用量不足时，钙或高岭土的存在有助于HA的去除，而当PAC-Al 30用量充足时，效果不明显。当PAC-Al 30用量为0.01和0.02 mmol/L时，钙浓度为2.0 mmol/L时，HA去除率分别提高了66.59和42.20%；钙浓度为2.0 mmol/L时，HA去除率分别提高了53.31和40.92%。高岭土颗粒浓度为150mg/L。钙可以压缩HA的双电层或络合物，中和HA表面的部分负电荷，但不能使水体系达到等电点。钙和高岭土的促进混凝作用的机制分别为吸附中和和碰撞聚集，但这些作用均弱于HA的PAC-Al 30 。计算得出PAC-Al 30的吸附中和能力是钙的近60倍，并且通过Sips方程修正的钙的较高γ值可能表明钙在HA上的吸附或中和位点比PAC-更挑剔。艾尔30。
更新日期：2020-07-14
中文翻译：
用 PAC-Al30 去除水中的腐殖酸：钙和高岭土的影响及其作用机制。
在实验室制备了以Al 30为主的聚合氯化铝（PAC-Al 30 ），并用于去除水中的腐殖酸（HA）。测试并讨论了PAC-Al 30 、HA、钙和高岭土的作用性质和机制。结果表明，当PAC-Al 30用量不足时，钙或高岭土的存在有助于HA的去除，而当PAC-Al 30用量充足时，效果不明显。当PAC-Al 30用量为0.01和0.02 mmol/L时，钙浓度为2.0 mmol/L时，HA去除率分别提高了66.59和42.20%；钙浓度为2.0 mmol/L时，HA去除率分别提高了53.31和40.92%。高岭土颗粒浓度为150mg/L。钙可以压缩HA的双电层或络合物，中和HA表面的部分负电荷，但不能使水体系达到等电点。钙和高岭土的促进混凝作用的机制分别为吸附中和和碰撞聚集，但这些作用均弱于HA的PAC-Al 30 。计算得出PAC-Al 30的吸附中和能力是钙的近60倍，并且通过Sips方程修正的钙的较高γ值可能表明钙在HA上的吸附或中和位点比PAC-更挑剔。艾尔30。
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