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Oil industry waste based non-magnetic and magnetic hydrochar to sequester potentially toxic post-transition metal ions from water.
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-06-19 , DOI: 10.1016/j.jhazmat.2020.123247
Moonis Ali Khan 1 , Ayoub Abdullah Alqadami 1 , Saikh Mohammad Wabaidur 1 , Masoom Raza Siddiqui 1 , Byong-Hun Jeon 2 , Shareefa Ahmed Alshareef 1 , Zeid A Alothman 1 , Abdelrazig Elfaki Hamedelniel 1
Affiliation  

Solid waste conversion to value-added products is a stepping stone towards sustainable environment. Herein, sesame oil cake (SOC), an oil industry waste was utilized as a precursor to develop hydrochar (HC) samples by varying reaction temperature (150–250 °C) and time span (2–8 h), chemically treated with 10% H2O2 to optimize a sample with maximum yield and Pb(II) adsorption. Highest yield (29.2 %) and Pb(II) (24.57 mg/g at Co: 15 mg/L) adsorption was observed on SOCHC@200 °C/6 h, magnetized (mSOCHC@200 °C/6 h) for comparative study. XRD displayed highly crystalline SOCHC@200 °C/6 h and amorphous mSOCHC@200 °C/6 h, both having a characteristic cellulose peak at 14.9°. mSOCHC@200 °C/6 h displayed superparamagnetic behavior with 11.2 emu/g saturation magnetization. IR spectra confirmed the development of samples rich in oxygen containing functionalities; an additional peak for iron oxides appeared at 586 cm−1 in mSOCHC@200°C/6 h spectrum. Four major peaks at 531.9, 399.9, 348.2 and 284.7 eV, assigned to O 1s, N 1s, Ca 2p and C 1s, respectively were observed during XPS analyses. An additional peak at 710.3 eV, ascribed to Fe 2p was observed in mSOCHC@200C/6 h XPS spectrum, while a peak at 143.2 eV for Pb 4f appeared in spectra of both Pb(II) saturated samples. pH dependent (maximum at ∼6.7), exothermic Pb(II) adsorption was found. About 50–70% (at Co: 25 mg/L) adsorption on both SOCHC@200 °C/6 h and mSOCHC@200 °C/6 h was accomplished in a minute, attaining equilibrium in 180 and 240 min, respectively. Error functions and superimposed qe, exp. and qe, cal. values supported Langmuir isotherm model applicability, with respective qm values of 304.9 and 361.7 mg/g at 25 °C for SOCHC@200 °C/6 h and mSOCHC@200 °C/6 h. Kinetic data was fitted to PSO model. Highest (between 92.2 and 88.9 %) amount of Pb(II) from SOCHC@200 °C/6 h and mSOCHC@200 °C/6 h was eluted by 0.01 M HCl.



中文翻译:

石油工业废料中的非磁性和磁性氢炭可螯合水中潜在有毒的过渡后金属离子。

固体废物转化为增值产品是迈向可持续环境的垫脚石。在此,通过改变反应温度(150–250°C)和时间跨度(2–8 h),用10种化学处理方法,将石油工业废料芝麻油饼(SOC)作为前体来开发水焦炭(HC)样品%H 2 O 2以优化具有最大产率和Pb(II)吸附的样品。最高收率(29.2%)和Pb(II)(在C o下为24.57 mg / g:在SOCHC @ 200°C / 6 h上观察到15 mg / L)吸附,并磁化(mSOCHC @ 200°C / 6 h)进行比较研究。XRD显示出高度结晶的SOCHC @ 200°C / 6 h和无定形的mSOCHC @ 200°C / 6 h,两者在14.9°处均具有特征性纤维素峰。mSOCHC @ 200°C / 6 h表现出超顺磁特性,饱和磁化强度为11.2 emu / g。红外光谱证实了富氧功能样品的开发。586 cm -1处出现一个额外的铁氧化物峰在mSOCHC @ 200°C / 6 h光谱中 在XPS分析期间,观察到四个分别位于O 1s,N 1s,Ca 2p和C 1s的主峰,分别为531.9、399.9、348.2和284.7 eV。在mSOCHC @ 200C / 6 h XPS光谱中观察到了另一个归因于Fe 2p的710.3 eV峰,而在两个Pb(II)饱和样品的光谱中都出现了Pb 4f的峰143.2 eV。pH依赖性(最大约6.7),发现放热的Pb(II)吸附。在一分钟内完成SOCHC @ 200°C / 6 h和mSOCHC @ 200°C / 6 h的约50–70%(在C o时:25 mg / L)吸附,分别在180和240分钟内达到平衡。误差函数和叠加q e,exp。和q e,cal。支持的值Langmuir等温线模型适用性,以及在25°C下,SOCHC @ 200°C / 6 h和mSOCHC @ 200°C / 6 h的q m值为304.9和361.7 mg / g。动力学数据拟合到PSO模型。用0.01 M HCl洗脱SOCHC @ 200°C / 6 h和mSOCHC @ 200°C / 6 h中最高(92.2%至88.9%)的Pb(II)。

更新日期:2020-06-19
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