Judul: Pemanfaatan Kulit Nangka (Artocarpus heterophyllus Lam.) sebagai Adsorben Alternatif terhadap Karbamazepina
Abstrak: Limbah kulit nangka mengandung selulosa yang dapat dimanfaatkan sebagai adsorben suatu senyawa penyebab pencemaran lingkungan. Porositas adsorben kulit nangka ditingkatkan melalui aktivasi menggunakan H3PO4. Adsorben yang dicirikan menggunakan spektroskopi inframerah transformasi Fourier menunjukkan puncak serapan khas untuk selulosa. Analisis morfologi menggunakan scanning electron microscope memperlihatkan bahwa karbon kulit nangka teraktivasi memiliki porositas yang lebih besar daripada tanpa aktivasi. Karbon aktif dengan konsentrasi H3PO4 2 M memberikan efisiensi adsorpsi optimum sebesar 51% dan waktu kontak adsorpsi optimum pada menit ke-30. Proses adsorpsi karbamazepina menggunakan karbon aktif kulit nangka mengikuti model kinetika orde dua semu dengan persamaan isoterm Freundlich. Studi termodinamika adsorpsi mengindikasikan bahwa proses adsorpsi terjadi secara eksoterm., Jackfruit peel waste contains cellulose that can be utilized as an adsorbent to adsorb environmental pollutants. The porosity of the jackfruit peel adsorbent was increased through an activation process using H3PO4. Fourier transform infrared spectroscopy characterized the resulting adsorbent, which shows characteristic cellulose absorption peaks. Morphological analysis using scanning electron microscopy reveals that activated jackfruit peel carbon has larger porosity than the unactivated ones. Through an H3PO4 concentration of 2 M, the activated carbon exhibits an optimum adsorption efficiency of 51% and an optimum adsorption contact time achieved at 30 minutes. The adsorption process of carbamazepine using the activated carbon follows a pseudo-second-order kinetic model with the Freundlich isoterm equation. Thermodynamic studies of the adsorption process indicate that the adsorption process is exothermic.
Keyword: activated carbon, adsorption, carbamazepine, H3PO4, jackfruit peel

Judul: Pemanfaatan Karbon Aktif dengan Aktivator H3PO4 dari Limbah Padat Agar sebagai Penjerap pada Limbah Cair Industri Penyamakan Kulit
Abstrak: Agar solid waste can be used as an adsorbent in the form of activated carbon. The study aims were to determine the best concentration of H3PO4 and activation time on the processing of activated carbon and the effectiveness of activated carbon as an adsorbent in the tanning industry wastewater. The activation step of activated carbon was carried out with H3PO4 concentration of 10; 20; 30% and the time activation of 15; 20; 25 hours. The best activation treatment was obtained on 10% H3PO4 concentration and 15 hours activation time with activated carbons yield of 93.42%, moisture content of 10.59%, ash content of 65.91%, absorption of iodine of 1090.80 mg/g, volatile matter of 21.60% dan fixed carbon of 12.35%. The best activated carbon was applied to the tanning industry wastewater with contact time of 0.5; 1; 1.5; 2 hours and activated carbon concentrations of 0; 1; 2; 3%. Application treatment with contact time of 0.5 hours and 3% activated carbon concentration decreased the value of Cr from 4371.21 ppm to 3572.76 ppm, treatment with contact time of 1 hours and 3% activated carbon concentration decreased the value of BOD, COD from 1216.10 mg/L, 17753.33 mg/L to 438.21 mg/L, 11770.00 mg/L respectively, however it did not affect the pH value.
Keyword: adsorbent, agar solid waste, wastewater, activated carbon, H3PO4

Judul: Integration of Islamic Stock Markets of OIC Countries Before and During the Russia-Ukraine War Crisis
Abstrak: Pasar saham yang terintegrasi memberikan dampak negatif seperti percepatan co-movement (pergerakan bersama) yang rentan terhadap guncangan ekonomi, maupun krisis pasar global ke pasar domestik. Salah satu krisis yang terjadi pada tahun 2022 adalah perang Rusia-Ukraina yang berdampak pada pasar saham, termasuk pada saham syariah yang dipercaya lebih tahan terhadap guncangan krisis global. Penelitian ini bertujuan untuk meneliti perkembangan, integrasi dan respon lima pasar saham syariah negara OKI pada perang Rusia-Ukraina. Metode yang digunakan adalah VAR/VECM pada indeks DJIMMT25, SPSADS, SPSUAEDS, JII, DJIMT, SPBMIR, dan SPBMIU. Hasil penelitian menunjukkan pergerakan yang sama pada pasar saham UAE dan Arab Saudi, sedangkan Turki mengalami tren positif selama perang. Pasar saham syariah negara OKI selama periode perang Rusia-Ukraina terkointegrasi, sementara pasar saham Malaysia memengaruhi pasar saham syariah empat negara OKI lainnya. Hasil IRF menunjukkan terdapat efek permanen pada volatilitas pasar saham syariah negara OKI akibat guncangan yang diberikan. Namun, respon volatilitas relatif kecil karena kontribusi guncangan lebih didominasi oleh pasar saham itu sendiri, An integrated stock market has negative impacts, such as accelerating co-movement, which is vulnerable to economic shocks and global market crises on the domestic market. One of the crises in 2022 was the Russia-Ukraine war which impacted the stock market, including Sharia stocks which were believed to be more resistant to the shocks of the global crisis. This study examines the development, integration, and response of OIC countries five Islamic stock markets in the Russia-Ukraine war. The method used is VAR/VECM on the DJIMMT25, SPSADS, SPSUUAEDS, JII, DJIMT, SPBMIR, and SPBMIU indices. The results show the same movement in the UAE and Saudi Arabia stock markets, while Turkey experienced a positive trend during the war. The Islamic stock market of the OIC countries during the Russia-Ukraine war was cointegrated. In contrast, the Malaysian stock market influenced the Islamic stock markets of the other four OIC countries. The IRF results show a permanent effect on the volatility of the Islamic stock market in OKI countries due to the shocks given. However, the volatility response is relatively small because the stock market itself dominates the contribution of shocks.
Keyword: co-movement, OIC, Rusia-Ukraine war, sharia stock market integration