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Adsorption of acid orange 7 dye in aqueous solutions by spent brewery grains

机译：废啤酒糟对水溶液中酸性橙7染料的吸附

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Spent brewery grains(SBG),a by-product of the brewing process,were tested as an adsorbent of acid orange 7 dye(AO_7),a monoazo acid dye currently used in paper and textile industries.The presence of AO_7 in these effluents causes obvious environmental problems.Kinetics studies of adsorption of AO_7 to SBG(3.75%,m/v)were carried out at 20 deg C,using aqueous solutions with different AO_7 concentrations(30-834 mg/L).For every situations tested,no significant variation in residual AO_7 concentration in solution was detected after 1 h contact between the dye and the adsorbent.The adsorption process followed a pseudo-first order model.The equilibrium process showed to be well described by both Freundlich and Langmuir isotherm models,at 20 and 30 deg C.The maximum adsorption capacity was estimated to be 30.5 mg AO_7/g SBG,at 30 deg C.Free energy of adsorption(DELTA G deg),enthalpy(DELTA H deg),and entropy(DELTA S deg)changes were calculated to predict the nature of adsorption.The estimated values for DELTA G deg were-22.78 and-24.53 kJ/mol,respectively,at 293.3 K(20 deg C)and 303.3 K(30 deg C),which are rather low indicating that a spontaneous process occurred.The enthalpy changes and entropy of adsorption were 28.66 and 175.36 J/mol K,respectively.The positive value for DELTA H deg indicates that the adsorption of AO_7 dye to SBG is an endothermic process.The positive value of entropy reflects the affinity of the adsorbent for AO_7 dye.The obtained results are very promising since:(i)high levels of colour removal(>90%)were achieved with low contact times adsorbent/dye(less than 1 h contact); and(ii)the whole SBG can be successfully used as adsorbent of AO_7 dye in aqueous solution without needing any previous treatments such as milling and/or sieving.Spent grains,being a cheap,and easily available material,can be an alternative for more costly adsorbents used for dye removal in wastewater treatment processes.
机译：酿酒过程中产生的副产品废啤酒糟（SBG）被测试为酸性橙7染料（AO_7）的吸附剂，酸性橙7染料是目前在造纸和纺织工业中使用的单偶氮酸染料。这些废水中存在AO_7明显的环境问题。在20°C下使用不同AO_7浓度（30-834 mg / L）的水溶液进行了AO_7对SBG（3.75％，m / v）的吸附动力学研究。染料与吸附剂接触1 h后，溶液中残留的AO_7浓度发生了显着变化。吸附过程遵循拟一阶模型.Freundlich和Langmuir等温模型均很好地描述了平衡过程，在20在30摄氏度和30摄氏度条件下，最大吸附容量估计为30.5 mg AO_7 / g SBG计算得出吸附的性质。 ΔGdeg的铝在293.3 K（20℃）和303.3 K（30℃）时分别为22.78和24.53 kJ / mol，这很低，表明发生了自发过程。焓变和熵吸附常数分别为28.66和175.36 J / molK.ΔH deg的正值表明AO_7染料对SBG的吸附是一个吸热过程。熵的正值反映了吸附剂对AO_7染料的亲和力。获得的结果非常有前景，因为：（i）吸附剂/染料的接触时间短（接触时间少于1小时），脱色率高（> 90％）; （ii）整个SBG可以成功地用作水溶液中AO_7染料的吸附剂，而无需进行任何先前的处理（例如研磨和/或筛分）。用过的谷物是一种廉价且易于获得的材料，可以替代其他用途。用于废水处理过程中染料去除的昂贵吸附剂。

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