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首页> 外文期刊>Journal of Hazardous Materials >Prepared self-growing supported nickel catalyst by recovering Ni (Ⅱ) from metal wastewater using geopolymer microspheres
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Prepared self-growing supported nickel catalyst by recovering Ni (Ⅱ) from metal wastewater using geopolymer microspheres

机译：地质聚合物微球从金属废水中回收镍（Ⅱ）制得自生长负载型镍催化剂

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Here, new and effective microsphere adsorbents were synthesized by NaOH activating slag based geopolymer (Na-SGS). These microsphere adsorbents upset the adsorption equilibrium with the maximum Ni2+ adsorption capacity of 414.38 mg/g which is much larger than that of other geopolymer materials. After Ni2+ adsorption from simulated nickel electroplating wastewater, more active positions for the adsorption Ni2+ ions on Na-SGS were provided as shifts from the average pore diameter of 22.00-7.44 nm, the pore volume of 0.06 to 0.25 cm(3)/g, the Brunauer-Emmett-Teller (BET) surface area of 10.46-125.35 m(2)/g and the apparent change of new morphology. Moreover, the adsorbed Ni2+ species were distributed uniformly on Na-SGS. Thermodynamic performance reflected an exothermic, spontaneous and molecular disorder adsorption process, which can be easily controlled by the pH, dosage, initial concentration, contact time and temperature. Through the controllable adsorption, Na-SGS after Ni2+ adsorption (Na-SGS-Ni) was recycled and then reduced to be directly supported nickel catalysts (red-Na-SGS-Ni), which showed superior catalytic activity for CO2 methanation. Although the highest percent of CO2 conversation (XCO2 = 99.54%) and methane selectivity (SCH4 = 99.5%) are both at 300 degrees C, red-Na-SGS-Ni performed good XCO2 (99.48%) and SCH4 (98.2%) at low temperatures (100 degrees C).
机译：在这里，通过NaOH活化矿渣基地质聚合物（Na-SGS）合成了新型有效的微球吸附剂。这些微球吸附剂破坏了吸附平衡，最大Ni2 +吸附容量为414.38 mg / g，比其他地质聚合物材料的吸附容量大得多。从模拟电镀镍废水中吸附Ni2 +后，Na-SGS上的Ni2 +吸附离子的活性位置随平均孔径从22.00-7.44 nm，孔体积从0.06到0.25 cm（3）/ g的变化而变化， Brunauer-Emmett-Teller（BET）表面积为10.46-125.35 m（2）/ g，并且新形态发生了明显变化。而且，吸附的Ni 2+种类均匀地分布在Na-SGS上。热力学性能反映了放热，自发和分子紊乱的吸附过程，可以容易地通过pH，剂量，初始浓度，接触时间和温度进行控制。通过可控的吸附，Ni2 +吸附后的Na-SGS（Na-SGS-Ni）被循环利用，然后还原为直接负载的镍催化剂（red-Na-SGS-Ni），对CO2甲烷化反应具有优异的催化活性。尽管最高的CO2转化百分比（XCO2 = 99.54％）和甲烷选择性（SCH4 = 99.5％）都在300摄氏度下进行，但红色Na-SGS-Ni在60℃时表现出良好的XCO2（99.48％）和SCH4（98.2％）低温（100摄氏度）。

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