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Photon shielding properties of alkali- and acid-treated Philippine natural zeolite 碱和酸处理菲律宾天然沸石的光子屏蔽性能
4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-09-11 DOI: 10.1180/clm.2023.25
Mon Bryan Z. Gili
Abstract The effects of chemical treatment on the radiation-shielding properties of Philippine natural zeolites were investigated using EpiXS following the EPICS2017 library. The zeolites were studied using X-ray diffraction and energy-dispersive X-ray spectroscopy. The acid treatment eliminated Fe and Ca, having a negative impact on the cross-section of the HCl-modified zeolite. The mass attenuation coefficients of the raw, NaOH- and HCl-modified zeolites at 1332 keV were 0.0545, 0.0544 and 0.0548 cm 2 g –1 , respectively. At 100–10,000 keV, the linear attenuation coefficient depends on the density and increases in the order HCl-modified > NaOH-modified > raw zeolite. In the energy range of 100–16,000 keV, the mean free path and half-value layer values are in the order of HCl-modified < NaOH-modified < raw zeolite. The raw and NaOH-modified zeolites have comparable effective atomic numbers, whereas the HCl-treated zeolite has significantly lower such values.
摘要采用EpiXS软件,研究了化学处理对菲律宾天然沸石辐射屏蔽性能的影响。用x射线衍射和能量色散x射线光谱对沸石进行了研究。酸处理消除了Fe和Ca,对盐酸改性沸石的横截面有负面影响。在1332 keV下,原料沸石、NaOH改性沸石和hcl改性沸石的质量衰减系数分别为0.0545、0.0544和0.0548 cm 2 g - 1。在100-10,000 keV范围内,线性衰减系数随密度的增大而增大。NaOH-modified祝辞原始的沸石。在100 ~ 16000 keV的能量范围内,平均自由程和半值层值依次为:hcl修饰的<NaOH-modified & lt;原始的沸石。原始沸石和氢氧化钠改性沸石的有效原子序数相当,而盐酸处理沸石的有效原子序数明显较低。
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引用次数: 0
Adsorption of gold nanoparticles on illite under high solid-liquid ratio and initial pH conditions 高固液比和初始pH条件下金纳米颗粒在伊利石上的吸附
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-25 DOI: 10.1180/clm.2023.23
Ping Zeng, Xin Nie, Zonghua Qin, S. Luo, Yuhong Fu, W. Yu, Meizhi Yang, Wenqi Luo, Q. Wan
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引用次数: 0
A novel magnetic sepiolite/Fe2O3 composite for adsorptive removal of lead(II) ions from aqueous solutions 一种新型磁性海泡石/Fe2O3复合材料吸附去除水中铅离子
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-25 DOI: 10.1180/clm.2023.24
Osman Uygun, Ayşenur Murat, Gaye Ö. Çakal
: Lead is one of the most frequently encountered toxic heavy metals that requires immediate remediation. To remediate wastewater, clay minerals are the preferred adsorbents. In this study, the removal of lead from aqueous solutions via adsorption was investigated using raw and iron-modified Turkish sepiolite. The aim of this study was to examine the effect of modification and environmental conditions on the sorptive properties of sepiolite samples. Initially, the raw sepiolite (Sep) and magnetic sepiolite/Fe 2 O 3 composite (MagSep) prepared by the co-precipitation method were characterized using mineralogical and petrographical means, and the physico-chemical properties were determined. Then, the batch adsorption of lead (Pb 2+ ) ions on the sepiolite samples were examined under various conditions (solution pH, adsorbent dosage, contact time, initial Pb 2+ ion concentration, temperature, shaking rate). The adsorption capacity of MagSep was found to be higher than that of Sep under all experimental conditions. The results showed that the adsorption process followed a pseudo-second-order kinetic model,
:铅是最常见的有毒重金属之一,需要立即修复。为了修复废水,粘土矿物是优选的吸附剂。在本研究中,使用生的和铁改性的土耳其海泡石,研究了通过吸附从水溶液中去除铅的方法。本研究的目的是考察改性和环境条件对海泡石样品吸附性能的影响。首先,用矿物学和岩石学方法对共沉淀法制备的海泡石原料(Sep)和磁性海泡石/Fe2O3复合材料(MagSep)进行了表征,并测定了其理化性质。然后,在不同的条件下(溶液pH、吸附剂用量、接触时间、Pb2+初始浓度、温度、振荡速率),考察了铅(Pb2+)在海泡石样品上的分批吸附。在所有实验条件下,MagSep的吸附容量均高于Sep。结果表明,吸附过程遵循准二阶动力学模型,
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引用次数: 0
PROSPECTION AND CHARACTERIZATION OF PLASTIC CLAYS FROM THE STATE OF SÃO PAULO, BRAZIL, AS RAW MATERIAL FOR PORCELAIN STONEWARE TILE PRODUCTION 巴西sÃo保罗州可塑粘土作为陶瓷砖生产原料的勘探与表征
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-18 DOI: 10.1180/clm.2023.22
S. R. Christofoletti, José Francisco Marciano Motta, Eduardo Camargo Meneghel, F. G. Melchiades
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引用次数: 0
Generalized relationships between the ionic radii of octahedral cations and the b crystallographic parameter of clay and related minerals 八面体阳离子的离子半径与粘土及相关矿物的b晶体学参数之间的广义关系
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-18 DOI: 10.1180/clm.2023.20
S. Petit, A. Decarreau, B. Grégoire, E. Ferrage
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引用次数: 0
Adsorptive removal of stable and radioactive Pb(II) isotopes from aqueous solution using bentonite, zeolite and perlite: characterization, isotherm and thermodynamic studies 使用膨润土、沸石和珍珠岩从水溶液中吸附去除稳定和放射性Pb(II)同位素:表征、等温线和热力学研究
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-17 DOI: 10.1180/clm.2023.18
Osman Uygun, R. Güven, Gaye Ö. Çakal
In this study, stable and radioactive lead removal from aqueous solution by adsorption using bentonite, zeolite and perlite minerals obtained from various locations in Türkiye was studied in batch experiments. The adsorbents were first characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), and then the physicochemical properties were determined. The effects of various factors that influence adsorption, such as solution pH, adsorbent dosage, contact time, initial Pb2+ ion concentration, temperature and shaking rate, were studied. The adsorption of Pb2+ was modelled using the Langmuir, Freundlich and Dubinin–Radushkevich isotherms. The adsorption capacities of the minerals for Pb2+ followed the order: bentonite > zeolite > perlite, and the maximum adsorption capacities were 131.6, 36.1 and 21.5 mg g–1, respectively. The adsorption data fit well with the Langmuir isotherm. The bonding of lead ions on the adsorbents was confirmed by XRF and FTIR analyses after the adsorption process. The adsorption of Pb2+ ions on the adsorbents was spontaneous and endothermic. The adsorption process took place by cation exchange in addition to electrostatic interaction. Furthermore, radioactive 210Pb2+ adsorption on bentonite, zeolite and perlite was studied, with the analyte being analysed using a liquid scintillation counter. It was seen that in addition to Pb(II) ions, these minerals also adsorbed the radioactive decay products of 210Pb, which were 210Po and 210Bi. The removal percentages of 210Pb were 95%, 38% and 30% and those of 210Po were 75%, 60% and 74% for bentonite, zeolite and perlite, respectively.
在这项研究中,在分批实验中研究了使用从土耳其不同地点获得的膨润土、沸石和珍珠岩矿物通过吸附从水溶液中稳定和具有放射性的铅去除。首先用X射线衍射(XRD)、X射线荧光(XRF)、傅立叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和能谱仪(EDS)对吸附剂进行了表征,然后测定了吸附剂的物理化学性质。研究了溶液pH、吸附剂用量、接触时间、Pb2+初始浓度、温度和振荡速率等因素对吸附性能的影响。使用Langmuir、Freundlich和Dubinin–Radushkevich等温线模拟Pb2+的吸附。矿物对Pb2+的吸附容量依次为:膨润土>沸石>珍珠岩,最大吸附容量分别为131.6、36.1和21.5 mg g–1。吸附数据符合Langmuir等温线。吸附过程后,通过XRF和FTIR分析证实了铅离子在吸附剂上的结合。Pb2+离子在吸附剂上的吸附是自发的和吸热的。除静电相互作用外,吸附过程还通过阳离子交换进行。此外,还研究了放射性210Pb2+在膨润土、沸石和珍珠岩上的吸附,并用液体闪烁计数器分析了分析物。结果表明,除Pb(II)离子外,这些矿物还吸附了210Pb的放射性衰变产物,即210Po和210Bi。膨润土、沸石和珍珠岩对210Pb的去除率分别为95%、38%和30%,对210Po的去除率为75%、60%和74%。
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引用次数: 1
Water-based drilling fluid with palygorskite: cutting carrying and contaminants 含坡缕石的水基钻井液:切割携带物和污染物
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-11 DOI: 10.1180/clm.2023.15
V. C. Santanna, Gabriela Carlos Nunes Araújo, Maria Thayse Andrade da Silva, T. N. C. Castro Dantas, Patrícia Mendonça Pimentel
In the petroleum industry, one of the most important functions fluids must perform is to carry cuttings efficiently. In this context, the contamination of drilling fluids represents a challenge to the industry because it alters the properties of these fluids. This work compares two drilling fluids (one palygorskite-based and the other polymer-based), evaluating the effects of contaminants on these drilling fluids and their ability to carry cuttings. A contaminant is considered to be any material that causes undesirable changes in the properties of the drilling fluid. Contamination of an aqueous drilling fluid by calcium hydroxide (Ca(OH)2) and brine can increase the filtrate volume, decrease the perforation rate and alter the rheological properties of the fluid. This work analyses the effects of contamination by Ca(OH)2 and brine on the properties of salted water-based drilling fluids viscosified with palygorskite. For comparison, tests were performed with a polymeric drilling fluid. The cutting-carrying capacity of these fluids was verified using the empirical correlations of Moore (1974), Chien (1994) and Walker & Mayes (1975). The results show that the drilling fluid with palygorskite is resistant to contamination with Ca(OH)2 and brine, presenting low filtrate volume values. The drilling fluid with palygorskite presented greater slip velocities than the polymeric drilling fluid. Regarding the cutting-carrying capacity, the drilling fluid with palygorskite presented positive transport ratio values (>0), making it suitable for carrying rock cuttings. However, the polymeric drilling fluid showed better performance in terms of cutting-carrying capacity.
在石油工业中,流体必须发挥的最重要的功能之一是有效地携带岩屑。在这种情况下,钻井液的污染对行业来说是一个挑战,因为它会改变这些钻井液的性质。这项工作比较了两种钻井液(一种是坡缕石基钻井液,另一种是聚合物基钻井液),评估了污染物对这些钻井液的影响及其携带岩屑的能力。污染物被认为是导致钻井液性质发生不希望的变化的任何材料。氢氧化钙(Ca(OH)2)和盐水对含水钻井液的污染可增加滤液体积、降低射孔率并改变流体的流变特性。分析了Ca(OH)2和盐水污染对坡缕石增稠盐水基钻井液性能的影响。为了进行比较,使用聚合物钻井液进行了测试。使用Moore(1974)、Chien(1994)和Walker&Mayes(1975)的经验相关性验证了这些流体的切削承载能力。结果表明,坡缕石钻井液不易受Ca(OH)2和盐水的污染,滤液体积值较低。坡缕石钻井液比聚合物钻井液具有更大的滑动速度。在岩屑携载能力方面,坡缕石钻井液呈现出正的输送比值(>0),适合携载岩屑。然而,聚合物钻井液在切削承载能力方面表现出更好的性能。
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引用次数: 0
Clay mineralogical evidence of near-equatorial Palaeocene–Eocene Thermal Maximum in Barmer Basin, India 印度Barmer盆地近赤道古新世-始新世热盛期的粘土矿物学证据
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-09 DOI: 10.1180/clm.2023.19
Rohit Kumar, A. Hameed, P. Srivastava
The Palaeocene–Eocene Thermal Maximum (PETM) was a global extreme climatic event, but it is relatively unknown from lower latitudes or equatorial regions in comparison to mid- and high latitudes. The present study provides the first clay mineralogical evidence of the PETM and subsequent hyperthermal events in a near-equatorial region represented by the Akli Formation in the Barmer Basin, India. The 32 m-thick succession of the Akli Formation shows abrupt changes in smectite and kaolin abundances preceding, during and succeeding the PETM event. Within the studied section, the kaolin content increases from 5–8% pre-PETM to 30–35% during the PETM, and then again decreases to 5–6% during the post-PETM period. The smectite, however, is marked by a corresponding decrease and its transformation into kaolin in acid weathering conditions. The transformation of the smectite is first marked by hydroxy interlayering and then transformation into kaolin during the PETM. The transformation of smectite into kaolin also resulted in extensive precipitation of iron oxide in sediments. The clay mineralogical changes in the Palaeocene–Eocene transition sediments of the Akli Formation were caused by 3–5°C warming and a 25–50% increase in rainfall during the hyperthermal events. Unusually high charcoal (~20%) fragments during the Palaeocene–Eocene transition also suggest warming and widespread biomass burning during the PETM in the lower latitudes.
古新世—始新世极热期(PETM)是一个全球性的极端气候事件,但与中高纬度地区相比,低纬度地区和赤道地区的极热期相对未知。本研究首次提供了以印度Barmer盆地Akli组为代表的近赤道地区PETM及其后高温事件的粘土矿物学证据。32 m厚的Akli组序列显示了在PETM事件之前、期间和之后蒙脱石和高岭土丰度的突变。在研究剖面中,高岭土含量由PETM前的5-8%上升至PETM后的30-35%,而后又下降至5-6%。而蒙脱石则在酸性风化条件下相应减少并转变为高岭土。蒙脱石的转变首先以羟基夹层为主,然后在始新世向高岭土转变。蒙脱石向高岭土的转化也导致沉积物中氧化铁的大量沉淀。Akli组古新世-始新世过渡沉积物的粘土矿物学变化是由3 ~ 5°C的升温和25 ~ 50%的降水增加引起的。古新世-始新世过渡时期异常高的木炭碎片(~20%)也表明在新世新世时期,低纬度地区的变暖和广泛的生物质燃烧。
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引用次数: 1
Desorption behavior of polymer on sepiolite surfaces under high-temperature and high-salinity conditions 高温高盐度条件下海泡石表面聚合物的解吸行为
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-02 DOI: 10.1180/clm.2023.21
Lingwan Lin, Yukun Yang, X. Li, Guobin Jiang, P. Luo
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引用次数: 0
Theoretical Analysis on Effect of Doping [Na(I), K(I), Mg(II), Ca(II), and Fe(II)] on the Electronic and Mechanical Properties of Pyrophyllite 掺杂[Na(I), K(I), Mg(II), Ca(II), Fe(II)]对叶叶石电子力学性能影响的理论分析
IF 1.5 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-08-02 DOI: 10.1180/clm.2023.17
Jian Zhao, Yi-Fei Wang, Zhaofu Luan, Yu Cao, M. He
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引用次数: 0
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Clay Minerals
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